[TRUNK][UPDATE]

- adds abstaction layer to -Conversion and -Marshaller classes
(AbstractConversion with abstact method convertAll and AbstactMarshaller with abstract method marshallAll)
- moves the actual calls for export from coreExporter/ldnTermsExporter to their belonging marshaller classes which override the marshallAll method
- changes the terminal outputs for info messages from system.err to system.out and keeps system.err for actual error messages
- moves the parts which call the converter and exporter of each module (e.g. core, ldnTerms) from the cliTool to seperate classes (rootConverter, rootExporter)

git-svn-id: https://svn.libreccm.org/ccm/trunk@5263 8810af33-2d31-482b-a856-94f89814c4df

ccm-core/src/com/arsdigita/portation/AbstractConversion.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2015 LibreCCM Foundation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301  USA
+ */
+package com.arsdigita.portation;
+
+/**
+ * Abstract class for converting all trunk objects of a certain class into
+ * objects of their corresponding ng classes.
+ *
+ * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers<\a>
+ * @version created the 2/7/18
+ */
+public abstract class AbstractConversion {
+
+    /**
+     * Retrieves all trunk objects of a certain class from the persistent
+     * storage and collects them in a list. Then calls for creating the
+     * equivalent ng objects focusing on keeping all the associations in tact.
+     */
+    public abstract void convertAll();
+}

ccm-core/src/com/arsdigita/portation/AbstractConverter.java

@@ -32,5 +32,5 @@ public abstract class AbstractConverter {
      * order, so that dependencies can only be set, where the objects have
      * already been created.
      */
-    public abstract void startConversionToNg();
+    public abstract void startConversion();
 }

ccm-core/src/com/arsdigita/portation/AbstractExporter.java

@@ -24,10 +24,21 @@ package com.arsdigita.portation;
  */
 public abstract class AbstractExporter {
 
+    protected static Format format;
     protected static String pathName;
-    protected static boolean indentation = false;
+    protected static boolean indentation;
 
-    public static void setPath(String path) {
+    public static void setFormat(final Format aFormat) {
+        format = aFormat;
+    }
+
+    public static void setPath(final String path) {
         pathName = path;
     }
+
+    public static void setIndentation(final boolean ind) {
+        indentation = ind;
+    }
+
+    public abstract void startMarshaller();
 }

ccm-core/src/com/arsdigita/portation/AbstractMarshaller.java

@@ -18,17 +18,19 @@
  */
 package com.arsdigita.portation;
 
+import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.SerializationFeature;
 import com.fasterxml.jackson.dataformat.xml.JacksonXmlModule;
-import com.fasterxml.jackson.module.jaxb.JaxbAnnotationModule;
 import com.fasterxml.jackson.dataformat.xml.XmlMapper;
 
-import org.apache.log4j.Logger;
-
 import java.io.File;
 import java.io.FileWriter;
 import java.io.IOException;
+import java.nio.file.FileAlreadyExistsException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
 import java.util.List;
 
 /**
@@ -42,97 +44,108 @@ import java.util.List;
  * @version created on 2/10/16
  */
 public abstract class AbstractMarshaller<P extends Portable> {
-
-    private static final Logger log = Logger.getLogger(AbstractMarshaller.class);
-
     private Format format;
-    private String filename;
+    private String pathName;
+    private String fileName;
+    private boolean indentation;
 
-    // XML specifics
+    /**
-    ObjectMapper xmlMapper;
+     * Passes the parameters for the file to which the ng objects shall be
+     * exported to down to its corresponding {@link AbstractMarshaller<P>}
+     * and then requests this {@link AbstractMarshaller<P>} to start the
+     * export of all its ng objects.
+     *
+     * @param format The format of the file to which will be exported to
+     * @param pathName The name for the file
+     * @param indentation Whether to use indentation in the file
+     */
+    public abstract void marshallAll(final Format format,
+                                     final String pathName,
+                                     final boolean indentation);
 
-
+    /**
-    public void prepare(final Format format, String filename, boolean indentation) {
+     * Prepares parameters for the export:
+     *
+     * @param format format of the exported file (e.g. xml)
+     * @param pathName path for the exported files
+     * @param fileName filenames
+     * @param indentation whether to use indentation or not
+     */
+    protected void prepare(final Format format,
+                           final String pathName,
+                           final String fileName,
+                           final boolean indentation) {
         this.format = format;
-
+        this.pathName = pathName;
-        switch (this.format) {
+        this.fileName = fileName;
-            case XML:
+        this.indentation = indentation;
-                this.filename = filename + ".xml";
-                // for additional configuration
-                JacksonXmlModule module = new JacksonXmlModule();
-                module.setDefaultUseWrapper(false);
-                xmlMapper = new XmlMapper(module);
-                if (indentation) {
-                    xmlMapper.enable(SerializationFeature.INDENT_OUTPUT);
-                }
-                //xmlMapper.registerModule(new JaxbAnnotationModule());
-                xmlMapper.disable(SerializationFeature.FAIL_ON_EMPTY_BEANS);
-                break;
-
-            default:
-                break;
-        }
     }
 
-    public void prepare(final Format format, String folderPath, String filename, boolean indentation) {
+    /**
-        File file = new File(folderPath);
+     * Exports list of the same objects.
-        if (file.exists() || file.mkdirs()) {
+     *
-            prepare(format, folderPath + "/" + filename, indentation);
+     * @param exportList List of same objects
-        }
+     */
-    }
+    protected void exportList(final List<P> exportList) {
-
+        ObjectMapper objectMapper = null;
-    public void exportList(final List<P> exportList) {
-        File file = new File(filename);
-        FileWriter fileWriter = null;
-
-        try {
-            fileWriter = new FileWriter(file);
-        } catch (IOException e) {
-            log.error(String.format("Unable to open a fileWriter for the file" +
-                    " with the name %s.", file.getName()));
-        }
-        if (fileWriter != null) {
-            for (P object : exportList) {
-                String line = null;
-
         switch (format) {
             case XML:
+                // xml extension to filename
+                fileName += ".xml";
+                // xml mapper configuration
+                final JacksonXmlModule module = new JacksonXmlModule();
+                module.setDefaultUseWrapper(false);
+                objectMapper = new XmlMapper(module);
+                break;
+        }
+
+        FileWriter fileWriter = null;
         try {
-                            line = xmlMapper.writeValueAsString(object);
+            final Path filePath = Paths.get(pathName, fileName);
-                            //log.info(line);
+            Files.createFile(filePath);
-                        } catch (IOException e) {
-                            log.error(String.format(
-                                    "Unable to write objetct of %s as XML " +
-                                    "string with name %s in file %s.",
-                                    object.getClass(),
-                                    object.toString(),
-                                    file.getName()), e);
-                        }
-                        break;
 
-                    default:
+            final File file = new File(filePath.toString());
-                        break;
+            fileWriter = new FileWriter(file);
+        } catch (FileAlreadyExistsException e) {
+            // destination file already exists
+        } catch (IOException ex) {
+            System.err.printf("ERROR Unable to open a fileWriter for the file" +
+                    " with the name %s.\n %s\n", fileName, ex);
         }
 
+        if (objectMapper != null && fileWriter != null) {
+            if (indentation) {
+                objectMapper.enable(SerializationFeature.INDENT_OUTPUT);
+            }
+            objectMapper.disable(SerializationFeature.FAIL_ON_EMPTY_BEANS);
+
+            String line = null;
+            for (P object : exportList) {
+                try {
+                    line = objectMapper.writeValueAsString(object);
+                } catch (JsonProcessingException ex) {
+                    System.err.printf("ERROR Unable to write object of class " +
+                                    "%s as XML string with name %s " +
+                                    "in file %s.\n %s\n", object.getClass(),
+                                    object.toString(), fileName, ex);
+                }
                 if (line != null) {
                     try {
                         fileWriter.write(line);
                         fileWriter.write(System.getProperty("line.separator"));
-                    } catch (IOException e) {
+                    } catch (IOException ex) {
-                        log.error(String.format(
+                        System.err.printf("ERROR Unable to write to file with" +
-                                "Unable to write to file with the name %s.",
+                                " the name %s.\n %s\n", fileName, ex);
-                                file.getName()));
                     }
                 }
             }
 
             try {
                 fileWriter.close();
-            } catch (IOException e) {
+            } catch (IOException ex) {
-                log.error(String.format("Unable to close a fileWriter for the" +
+                System.err.printf("ERROR Unable to close a fileWriter for" +
-                        " file with the name %s.", file.getName()));
+                        " a file with the name %s.\n %s\n", fileName, ex);
-            }
+            }
-
         }
     }
 }

ccm-core/src/com/arsdigita/portation/cmd/ExportCliTool.java

@@ -18,13 +18,10 @@
  */
 package com.arsdigita.portation.cmd;
 
-import com.arsdigita.portation.conversion.CoreConverter;
+import com.arsdigita.portation.AbstractExporter;
-import com.arsdigita.portation.modules.CoreExporter;
+import com.arsdigita.portation.Format;
 import com.arsdigita.util.cmd.Program;
 import org.apache.commons.cli.CommandLine;
-import org.apache.log4j.Logger;
-
-import java.lang.reflect.Method;
 
 /**
  * A Commandline tool for exporting all the objects of specified classes to
@@ -34,9 +31,6 @@ import java.lang.reflect.Method;
  * @version created on 25.05.16
  */
 public class ExportCliTool extends Program {
-
-    private final static Logger logger = Logger.getLogger(ExportCliTool.class);
-
     /**
      * Constructor for the command line tool.
      */
@@ -104,30 +98,16 @@ public class ExportCliTool extends Program {
     /**
      * Method for converting all trunk objects into ng objects at once.
      */
-    @SuppressWarnings("unchecked")
     private void convert() {
         try {
-            System.err.println("Started conversions of systems objects to " +
+            System.out.println("Started conversions of systems objects to " +
                     "ng-objects:");
-
+            RootConverter.rootConversionExecution();
-            // Core conversions
+            System.out.println("Finished conversions.");
-            CoreConverter.getInstance().startConversionToNg();
+            System.out.print("\n");
-
-            // Lnd-Terms conversions
-            Class cls = Class
-                    .forName("com.arsdigita.london.terms.portation" +
-                            ".conversion.LdnTermsConverter");
-            if (cls != null) {
-                Method startConversionToNg = cls
-                        .getDeclaredMethod("startConversionToNg");
-                startConversionToNg.invoke(cls.newInstance());
-            }
-
-            System.err.println("Finished conversions.");
-            System.out.printf("\n");
         } catch (Exception e) {
-            logger.error("ERROR while converting trunk-objects to " +
+            System.err.printf("ERROR while converting trunk-objects to " +
-                    "ng-objects", e);
+                    "ng-objects: %s\n", e);
             e.printStackTrace();
         }
     }
@@ -138,41 +118,30 @@ public class ExportCliTool extends Program {
      *
      * @param args The secondary command line arguments
      */
-    @SuppressWarnings("unchecked")
     private void export(String[] args) {
         if (args.length != 2) {
             printUsage();
             System.exit(-1);
         }
 
-        //final String moduleClass = args[1];
+        final Format format = Format.XML;
-        //System.err.printf("module-class: %s\n", moduleClass);
         final String pathName = args[1];
-        System.err.printf("path for export: %s\n", pathName);
+        final boolean ind = false;
-        CoreExporter.setPath(pathName);
+        System.out.printf("format to export to: %s\n", format.toString());
-        System.err.printf("\n");
+        System.out.printf("path to export to: %s\n", pathName);
-
+        System.out.printf("indentations in files: %b\n", ind);
+        AbstractExporter.setFormat(format);
+        AbstractExporter.setPath(pathName);
+        AbstractExporter.setIndentation(ind);
+        System.out.print("\n");
 
         try {
             System.out.println("Started exporting all ng-objects:");
-
+            RootExporter.rootExportExecution();
-            // Core
-            CoreExporter.startExport();
-
-            // Ldn-Terms
-            Class cls = Class
-                    .forName("com.arsdigita.london.terms.portation.modules" +
-                             ".LdnTermsExporter");
-            if (cls != null) {
-                Method startExport = cls
-                                .getDeclaredMethod("startExport");
-                startExport.invoke(cls.newInstance());
-            }
-
             System.out.println("Finished exports.");
-            System.out.printf("\n");
+            System.out.print("\n");
         } catch (Exception ex) {
-            logger.error("ERROR while exporting", ex);
+            System.err.printf("ERROR while exporting: %s\n", ex);
         }
     }
 
@@ -180,25 +149,25 @@ public class ExportCliTool extends Program {
      * Prints the usage of this command line tool.
      */
     private void printUsage() {
-        System.err.printf(
+        System.out.print(
         "\n" +
-        "\t\t\t    --- ExportCliTool ---\n" +
+        "\t\t\t\t    --- ExportCliTool ---\n" +
         "\n" +
-        "usage:\t<command> <module-class> <path>\n" +
+        "Usage:\t<command>\n" +
         "\n" +
         "Available commands:\n" +
         "\thelp" +
                 "\t\t\t\t\t Shows information on how to use this tool.\n" +
         "\tconvert" +
                 "\t\t\t\t\t Converts all trunk objects to ng objects.\n" +
-        "\texport <module-class> <path>" +
+        "\texport <path>" +
-                "\t\t Exports the chosen module class to a file\n" +
+                "\t\t\t\t Exports the chosen module class to a file\n" +
                 "\t\t\t\t" +
                 "\t\t at the location specified by the given path." +
         "\n" +
         "\n" +
         "Available module-classes for export:\n" +
-        "   \t\t categories        \t\t all categories of the system\n" +
+        /*"   \t\t categories        \t\t all categories of the system\n" +
         "   \t\t categorizations   \t\t all categorizations of the system\n" +
         "   \t\t users             \t\t all users of the system\n" +
         "   \t\t groups            \t\t all groups of the system\n" +
@@ -212,9 +181,8 @@ public class ExportCliTool extends Program {
         "   \t\t permissions       \t\t all permissions of the system\n" +
         "   \n" +
         "   \t\t default:          \t\t all objects of the entire core module" +
+        */"\n" +
         "\n" +
-        "\n" +
-        "" +
         "Do use for exporting java objects of a specified class.\n" +
         "\n"
         );

ccm-core/src/com/arsdigita/portation/cmd/RootConverter.java

@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2015 LibreCCM Foundation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301  USA
+ */
+package com.arsdigita.portation.cmd;
+
+import com.arsdigita.portation.conversion.CoreConverter;
+
+import java.lang.reflect.Method;
+
+/**
+ * Helper class to bundle all conversion calls.
+ *
+ * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers<\a>
+ * @version created the 2/7/18
+ */
+public class RootConverter {
+
+    /**
+     * Root method to call all conversions.
+     *
+     * @throws Exception if classes outwards of core will not be found
+     */
+    @SuppressWarnings("unchecked")
+    public static void rootConversionExecution() throws Exception {
+        // Core conversions
+        CoreConverter.getInstance().startConversion();
+
+        // Lnd-Terms conversions
+        Class cls = Class
+                .forName("com.arsdigita.london.terms.portation" +
+                        ".conversion.LdnTermsConverter");
+        if (cls != null) {
+            Method startConversionToNg = cls
+                    .getDeclaredMethod("startConversion");
+            startConversionToNg.invoke(cls.newInstance());
+        }
+
+        // ...
+    }
+}

ccm-core/src/com/arsdigita/portation/cmd/RootExporter.java

@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2015 LibreCCM Foundation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301  USA
+ */
+package com.arsdigita.portation.cmd;
+
+import com.arsdigita.portation.modules.CoreExporter;
+
+import java.lang.reflect.Method;
+
+/**
+ * Helper class to bundle all export calls.
+ *
+ * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers<\a>
+ * @version created the 2/7/18
+ */
+public class RootExporter {
+
+    /**
+     * Root method to call all exportation
+     *
+     * @throws Exception if classes outwards of core will not be found
+     */
+    @SuppressWarnings("unchecked")
+    public static void rootExportExecution() throws Exception {
+        // Core
+        CoreExporter.getInstance().startMarshaller();
+
+        // Ldn-Terms
+        Class cls = Class
+                .forName("com.arsdigita.london.terms.portation.modules" +
+                        ".LdnTermsExporter");
+        if (cls != null) {
+            Method startExport = cls
+                    .getDeclaredMethod("startMarshaller");
+            startExport.invoke(cls.newInstance());
+        }
+
+        // ...
+    }
+}

ccm-core/src/com/arsdigita/portation/conversion/CoreConverter.java

@@ -47,20 +47,29 @@ public class CoreConverter extends AbstractConverter {
         instance = new CoreConverter();
     }
 
+    /**
+     * Getter for the instance of the singleton.
+     *
+     * @return instance of this singleton
+     */
+    public static CoreConverter getInstance() {
+        return instance;
+    }
+
     /**
      * Method, to start all the different converter classes in a specific
      * order, so that dependencies can only be set, where the objects have
      * already been created.
      */
     @Override
-    public void startConversionToNg() {
+    public void startConversion() {
-        UserConversion.convertAll();
+        UserConversion.getInstance().convertAll();
-        GroupConversion.convertAll();
+        GroupConversion.getInstance().convertAll();
-        RoleConversion.convertAll();
+        RoleConversion.getInstance().convertAll();
 
-        CategoryConversion.convertAll();
+        CategoryConversion.getInstance().convertAll();
 
-        PermissionConversion.convertAll();
+        PermissionConversion.getInstance().convertAll();
         // Verify permissions
         for (Permission permission : NgCoreCollection.permissions.values()) {
             if (permission.getGrantee() == null) {
@@ -70,17 +79,8 @@ public class CoreConverter extends AbstractConverter {
             }
         }
 
-        WorkflowConversion.convertAll();
+        WorkflowConversion.getInstance().convertAll();
-        TaskCommentConversion.convertAll();
+        TaskCommentConversion.getInstance().convertAll();
-        AssignableTaskConversion.convertAll();
+        AssignableTaskConversion.getInstance().convertAll();
-    }
-
-    /**
-     * Getter for the instance of the singleton.
-     *
-     * @return instance of this singleton
-     */
-    public static CoreConverter getInstance() {
-        return instance;
     }
 }

ccm-core/src/com/arsdigita/portation/conversion/core/categorization/CategoryConversion.java

@@ -20,6 +20,7 @@ package com.arsdigita.portation.conversion.core.categorization;
 
 import com.arsdigita.categorization.CategorizedCollection;
 import com.arsdigita.kernel.ACSObject;
+import com.arsdigita.portation.AbstractConversion;
 import com.arsdigita.portation.conversion.NgCoreCollection;
 import com.arsdigita.portation.modules.core.categorization.Categorization;
 import com.arsdigita.portation.modules.core.categorization.Category;
@@ -37,7 +38,12 @@ import java.util.List;
  * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers</a>
  * @version created on 29.6.16
  */
-public class CategoryConversion {
+public class CategoryConversion extends AbstractConversion {
+    private static CategoryConversion instance;
+
+    static {
+        instance = new CategoryConversion();
+    }
 
     /**
      * Retrieves all trunk-{@link com.arsdigita.categorization.Category}s from
@@ -45,19 +51,20 @@ public class CategoryConversion {
      * creating the equivalent ng-{@link Category}s focusing on keeping all the
      * associations in tact.
      */
-    public static void convertAll() {
+    @Override
-        System.err.printf("\tFetching categories from database...");
+    public void convertAll() {
+        System.out.print("\tFetching categories from database...");
         List<com.arsdigita.categorization.Category> trunkCategories = com
                 .arsdigita.categorization.Category.getAllObjectCategories();
-        System.err.println("done.");
+        System.out.println("done.");
 
-        System.err.printf("\tConverting categories and categorizations...\n");
+        System.out.print("\tConverting categories and categorizations...\n");
         createCategoryAndCategorizations(trunkCategories);
         setRingAssociations(trunkCategories);
-        System.err.printf("\tSorting categories...\n");
+        System.out.print("\tSorting categories...\n");
         sortCategoryMap();
 
-        System.err.println("\tdone.\n");
+        System.out.println("\tdone.\n");
     }
 
     /**
@@ -68,7 +75,7 @@ public class CategoryConversion {
      *                        {@link com.arsdigita.categorization.Category}s
      *                        from this old trunk-system.
      */
-    private static void createCategoryAndCategorizations(
+    private void createCategoryAndCategorizations(
             List<com.arsdigita.categorization.Category> trunkCategories) {
         int processedCategories = 0, processedCategorizations = 0;
 
@@ -88,7 +95,7 @@ public class CategoryConversion {
 
             processedCategories++;
         }
-        System.err.printf("\t\tCreated %d categories and\n" +
+        System.out.printf("\t\tCreated %d categories and\n" +
                           "\t\tcreated %d categorizations.\n",
                           processedCategories, processedCategorizations);
     }
@@ -104,7 +111,7 @@ public class CategoryConversion {
      *
      * @return Number of how many {@link Categorization}s have been processed.
      */
-    private static long createCategorizations(Category category,
+    private long createCategorizations(Category category,
                                               CategorizedCollection
                                                       categorizedObjects) {
         int processed = 0;
@@ -140,7 +147,7 @@ public class CategoryConversion {
      *                        {@link com.arsdigita.categorization.Category}s
      *                        from this old trunk-system.
      */
-    private static void setRingAssociations(
+    private void setRingAssociations(
             List<com.arsdigita.categorization.Category> trunkCategories) {
         for (com.arsdigita.categorization.Category
                 trunkCategory : trunkCategories) {
@@ -176,7 +183,7 @@ public class CategoryConversion {
      * Runs once over the unsorted map and iterates over each their parents
      * to add them to the sorted list.
      */
-    private static void sortCategoryMap() {
+    private void sortCategoryMap() {
         ArrayList<Category> sortedList = new ArrayList<>();
 
         int runs = 0;
@@ -190,7 +197,7 @@ public class CategoryConversion {
         }
         NgCoreCollection.sortedCategories = sortedList;
 
-        System.err.printf("\t\tSorted categories in %d runs.\n", runs);
+        System.out.printf("\t\tSorted categories in %d runs.\n", runs);
     }
 
     /**
@@ -200,7 +207,7 @@ public class CategoryConversion {
      * @param sortedList Map of already sorted categories
      * @param category Current category
      */
-    private static void addParent(ArrayList<Category> sortedList, Category
+    private void addParent(ArrayList<Category> sortedList, Category
             category) {
         Category parent = category.getParentCategory();
 
@@ -211,4 +218,13 @@ public class CategoryConversion {
                 sortedList.add(parent);
         }
     }
+
+    /**
+     * Getter for the instance of the singleton.
+     *
+     * @return instance of this singleton
+     */
+    public static CategoryConversion getInstance() {
+        return instance;
+    }
 }

ccm-core/src/com/arsdigita/portation/conversion/core/security/GroupConversion.java

@@ -19,6 +19,7 @@
 package com.arsdigita.portation.conversion.core.security;
 
 import com.arsdigita.kernel.UserCollection;
+import com.arsdigita.portation.AbstractConversion;
 import com.arsdigita.portation.conversion.NgCoreCollection;
 import com.arsdigita.portation.modules.core.security.Group;
 import com.arsdigita.portation.modules.core.security.GroupMembership;
@@ -34,7 +35,12 @@ import java.util.List;
  * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers</a>
  * @version created on 4.7.16
  */
-public class GroupConversion {
+public class GroupConversion extends AbstractConversion {
+    private static GroupConversion instance;
+    
+    static {
+        instance = new GroupConversion();
+    }
 
     /**
      * Retrieves all trunk-{@link com.arsdigita.kernel.Group}s from the
@@ -43,15 +49,16 @@ public class GroupConversion {
      * trunk-system. Then calls for creating the equivalent ng-{@link Group}s
      * focusing on keeping all the associations in tact.
      */
-    public static void convertAll() {
+    @Override
-        System.err.printf("\tFetching groups from database...");
+    public void convertAll() {
+        System.out.print("\tFetching groups from database...");
         List<com.arsdigita.kernel.Group> trunkGroups = com.arsdigita.kernel
                 .Group.getAllObjectGroups();
-        System.err.println("done.");
+        System.out.println("done.");
 
-        System.err.printf("\tConverting groups and group memberships...\n");
+        System.out.print("\tConverting groups and group memberships...\n");
         createGroupsAndSetAssociations(trunkGroups);
-        System.err.println("\tdone.\n");
+        System.out.println("\tdone.\n");
     }
 
     /**
@@ -61,7 +68,7 @@ public class GroupConversion {
      * @param trunkGroups List of all {@link com.arsdigita.kernel.Group}s
      *                    from this old trunk-system.
      */
-    private static void createGroupsAndSetAssociations(
+    private void createGroupsAndSetAssociations(
             List<com.arsdigita.kernel.Group> trunkGroups) {
         int pGroups = 0, pMemberships = 0;
 
@@ -75,7 +82,7 @@ public class GroupConversion {
 
             pGroups++;
         }
-        System.err.printf("\t\tCreated %d groups and\n" +
+        System.out.printf("\t\tCreated %d groups and\n" +
                           "\t\tcreated %d group memberships.\n",
                           pGroups, pMemberships);
     }
@@ -90,7 +97,7 @@ public class GroupConversion {
      *                       {@link com.arsdigita.kernel.User}s belonging to
      *                       the given group
      */
-    private static long createGroupMemberships(Group group, UserCollection
+    private long createGroupMemberships(Group group, UserCollection
             userCollection) {
         int processed = 0;
 
@@ -115,4 +122,12 @@ public class GroupConversion {
         return processed;
     }
 
+    /**
+     * Getter for the instance of the singleton.
+     *
+     * @return instance of this singleton
+     */
+    public static GroupConversion getInstance() {
+        return instance;
+    }
 }

ccm-core/src/com/arsdigita/portation/conversion/core/security/PermissionConversion.java

@@ -19,6 +19,7 @@
 package com.arsdigita.portation.conversion.core.security;
 
 import com.arsdigita.kernel.RoleCollection;
+import com.arsdigita.portation.AbstractConversion;
 import com.arsdigita.portation.conversion.NgCoreCollection;
 import com.arsdigita.portation.modules.core.core.CcmObject;
 import com.arsdigita.portation.modules.core.security.*;
@@ -39,8 +40,13 @@ import java.util.stream.Collectors;
  * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers</a>
  * @version created on 14.7.16
  */
-public class PermissionConversion {
+public class PermissionConversion extends AbstractConversion {
-    private static int rolesCreated = 0;
+    private static PermissionConversion instance;
+    private int rolesCreated = 0;
+    
+    static {
+        instance = new PermissionConversion();
+    }
 
     /**
      * Retrieves all trunk-{@link com.arsdigita.kernel.permissions.Permission}s
@@ -49,14 +55,15 @@ public class PermissionConversion {
      * the associations in tact. The association to the {@code
      * grantee}-{@link Role} has to be recreated separately.
      */
-    public static void convertAll() {
+    @Override
-        System.err.printf("\tFetching permissions from database...");
+    public void convertAll() {
+        System.out.print("\tFetching permissions from database...");
         List<com.arsdigita.kernel.permissions.Permission> trunkPermissions =
                 com.arsdigita.kernel.permissions.Permission
                         .getAllObjectPermissions();
-        System.err.println("done.");
+        System.out.println("done.");
 
-        System.err.printf("\tConverting permissions...\n");
+        System.out.print("\tConverting permissions...\n");
         createPermissionsAndSetAssociations(trunkPermissions);
 
         try {
@@ -68,7 +75,7 @@ public class PermissionConversion {
             System.exit(-1);
         }
 
-        System.err.println("\tdone.\n");
+        System.out.println("\tdone.\n");
     }
 
     /**
@@ -79,7 +86,7 @@ public class PermissionConversion {
      *                         {@link com.arsdigita.kernel.permissions.Permission}s
      *                         from the old trunk-system
      */
-    private static void createPermissionsAndSetAssociations(final List<com
+    private void createPermissionsAndSetAssociations(final List<com
             .arsdigita.kernel.permissions.Permission> trunkPermissions) {
         int processed = 0, skipped = 0;
 
@@ -95,7 +102,7 @@ public class PermissionConversion {
                     .get("id")).longValue()
                     || -200 == ((BigDecimal) trunkPermission.getPartyOID()
                     .get("id")).longValue()) {
-                /*System.err.println(
+                /*System.out.println(
                         "Skiping because it is a internal permission");*/
                 skipped++;
                 continue;
@@ -125,7 +132,7 @@ public class PermissionConversion {
 
             processed++;
         }
-        System.err.printf("\t\tCreated %d permissions and skipped: %d.\n",
+        System.out.printf("\t\tCreated %d permissions and skipped: %d.\n",
                 processed, skipped);
     }
 
@@ -148,7 +155,7 @@ public class PermissionConversion {
      *                         {@link com.arsdigita.kernel.permissions.Permission}s
      *                         from the old trunk-system
      */
-    private static void setGranteeDependency(final List<com.arsdigita.kernel
+    private void setGranteeDependency(final List<com.arsdigita.kernel
             .permissions.Permission> trunkPermissions) {
         int duplicates = 0;
 
@@ -248,7 +255,7 @@ public class PermissionConversion {
                         trunkPermission.getACSObject().get("id")).longValue());
             }
         }
-        System.err.printf("\t\t(Created %d duplicates and created %d new " +
+        System.out.printf("\t\t(Created %d duplicates and created %d new " +
                         "roles.)\n", duplicates, rolesCreated);
     }
 
@@ -259,7 +266,7 @@ public class PermissionConversion {
      *
      * @return A role for the specified member
      */
-    private static Role getRoleIfExists(Party member) {
+    private Role getRoleIfExists(Party member) {
         // might cause problems cause the
         // task assignments are missing
         String roleName = member.getName() + "_role";
@@ -280,4 +287,13 @@ public class PermissionConversion {
         return granteeRole;
 
     }
+
+    /**
+     * Getter for the instance of the singleton.
+     *
+     * @return instance of this singleton
+     */
+    public static PermissionConversion getInstance() {
+        return instance;
+    }
 }

ccm-core/src/com/arsdigita/portation/conversion/core/security/RoleConversion.java

@@ -20,6 +20,7 @@ package com.arsdigita.portation.conversion.core.security;
 
 
 import com.arsdigita.kernel.PartyCollection;
+import com.arsdigita.portation.AbstractConversion;
 import com.arsdigita.portation.conversion.NgCoreCollection;
 import com.arsdigita.portation.modules.core.security.Party;
 import com.arsdigita.portation.modules.core.security.Role;
@@ -35,7 +36,12 @@ import java.util.List;
  * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers</a>
  * @version created on 4.7.16
  */
-public class RoleConversion {
+public class RoleConversion extends AbstractConversion{
+    private static RoleConversion instance;
+
+    static {
+        instance = new RoleConversion();
+    }
 
     /**
      * Retrieves all trunk-{@link com.arsdigita.kernel.Role}s from the
@@ -43,15 +49,16 @@ public class RoleConversion {
      * creating the equivalent ng-{@link Role}s focusing on keeping all the
      * associations in tact.
      */
-    public static void convertAll() {
+    @Override
-        System.err.printf("\tFetching roles from database...");
+    public void convertAll() {
+        System.out.print("\tFetching roles from database...");
         List<com.arsdigita.kernel.Role> trunkRoles = com.arsdigita.kernel
                 .Role.getAllObjectRoles();
-        System.err.println("done.");
+        System.out.println("done.");
 
-        System.err.printf("\tCreating roles and role memberships...\n");
+        System.out.print("\tCreating roles and role memberships...\n");
         createRolesAndSetAssociations(trunkRoles);
-        System.err.println("\tdone.\n");
+        System.out.println("\tdone.\n");
     }
 
     /**
@@ -61,7 +68,7 @@ public class RoleConversion {
      * @param trunkRoles List of all {@link com.arsdigita.kernel.Role}s from
      *                   this old trunk-system.
      */
-    private static void createRolesAndSetAssociations(
+    private void createRolesAndSetAssociations(
             List<com.arsdigita.kernel.Role> trunkRoles) {
         int pRoles = 0, pMemberships = 0;
 
@@ -90,7 +97,7 @@ public class RoleConversion {
      *                        {@link com.arsdigita.kernel.Party}s belonging to
      *                        the given group
      */
-    private static long createRoleMemberships(Role role, PartyCollection
+    private long createRoleMemberships(Role role, PartyCollection
             partyCollection) {
         int processed = 0;
 
@@ -112,4 +119,13 @@ public class RoleConversion {
 
         return processed;
     }
+
+    /**
+     * Getter for the instance of the singleton.
+     *
+     * @return instance of this singleton
+     */
+    public static RoleConversion getInstance() {
+        return instance;
+    }
 }

ccm-core/src/com/arsdigita/portation/conversion/core/security/UserConversion.java

@@ -18,6 +18,7 @@
  */
 package com.arsdigita.portation.conversion.core.security;
 
+import com.arsdigita.portation.AbstractConversion;
 import com.arsdigita.portation.modules.core.security.User;
 
 import java.util.List;
@@ -30,20 +31,26 @@ import java.util.List;
  * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers</a>
  * @version created on 4.7.16
  */
-public class UserConversion {
+public class UserConversion extends AbstractConversion {
+    private static UserConversion instance;
+
+    static {
+        instance = new UserConversion();
+    }
 
     /**
      * Retrieves all trunk-{@link com.arsdigita.kernel.User}s from the
      * persistent storage and collects them in a list. Then calls for
      * creating the equivalent ng-{@link User}s.
      */
-    public static void convertAll() {
+    @Override
-        System.err.printf("\tFetching users from database...");
+    public void convertAll() {
+        System.out.print("\tFetching users from database...");
         List<com.arsdigita.kernel.User> trunkUsers = com.arsdigita.kernel
                 .User.getAllObjectUsers();
-        System.err.println("done.");
+        System.out.println("done.");
 
-        System.err.printf("\tConverting users...\n");
+        System.out.print("\tConverting users...\n");
         // create users
         int processed = 0;
         for (com.arsdigita.kernel.User trunkUser : trunkUsers) {
@@ -51,6 +58,15 @@ public class UserConversion {
             processed++;
         }
         System.out.printf("\t\tCreated %d users.\n", processed);
-        System.err.println("\tdone.\n");
+        System.out.println("\tdone.\n");
+    }
+
+    /**
+     * Getter for the instance of the singleton.
+     *
+     * @return instance of this singleton
+     */
+    public static UserConversion getInstance() {
+        return instance;
     }
 }

ccm-core/src/com/arsdigita/portation/conversion/core/workflow/AssignableTaskConversion.java

@@ -21,11 +21,11 @@ package com.arsdigita.portation.conversion.core.workflow;
 
 import com.arsdigita.kernel.GroupCollection;
 import com.arsdigita.kernel.RoleCollection;
+import com.arsdigita.portation.AbstractConversion;
 import com.arsdigita.portation.conversion.NgCoreCollection;
 import com.arsdigita.portation.modules.core.security.Role;
 import com.arsdigita.portation.modules.core.security.User;
 import com.arsdigita.portation.modules.core.workflow.AssignableTask;
-import com.arsdigita.portation.modules.core.workflow.Task;
 import com.arsdigita.portation.modules.core.workflow.TaskAssignment;
 import com.arsdigita.portation.modules.core.workflow.TaskComment;
 import com.arsdigita.portation.modules.core.workflow.TaskDependency;
@@ -44,8 +44,12 @@ import java.util.List;
  * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers</a>
  * @version created on 29.6.16
  */
-public class AssignableTaskConversion {
+public class AssignableTaskConversion extends AbstractConversion {
+    private static AssignableTaskConversion instance;
 
+    static {
+        instance = new AssignableTaskConversion();
+    }
     /**
      * Retrieves all trunk-{@link com.arsdigita.workflow.simple.UserTask}s from
      * the persistent storage and collects them in a list. Then calls for
@@ -53,19 +57,20 @@ public class AssignableTaskConversion {
      * associations in tact. The ring dependencies of class {@code Task} have
      * to be recreated once all ng-{@link AssignableTask}s have been created.
      */
-    public static void convertAll() {
+    @Override
-        System.err.printf("\tFetching assignable tasks from database...");
+    public void convertAll() {
+        System.out.print("\tFetching assignable tasks from database...");
         List<com.arsdigita.workflow.simple.UserTask> trunkUserTasks = com
                 .arsdigita.workflow.simple.UserTask.getAllObjectUserTasks();
-        System.err.println("done.");
+        System.out.println("done.");
 
-        System.err.printf("\tConverting assignable tasks, task dependencies " +
+        System.out.print("\tConverting assignable tasks, task dependencies " +
                 "and task assignments...\n");
         createAssignableTasksAndSetAssociations(trunkUserTasks);
-        System.err.printf("\tSorting task assignments...\n");
+        System.out.print("\tSorting task assignments...\n");
         sortAssignableTaskMap();
 
-        System.err.println("\tdone.\n");
+        System.out.println("\tdone.\n");
 
     }
 
@@ -77,7 +82,7 @@ public class AssignableTaskConversion {
      *                       {@link com.arsdigita.workflow.simple.UserTask}s
      *                       from this old trunk-system.
      */
-    private static void createAssignableTasksAndSetAssociations(List<com.arsdigita
+    private void createAssignableTasksAndSetAssociations(List<com.arsdigita
             .workflow.simple.UserTask> trunkUserTasks) {
         int pTasks = 0, pAssignments = 0, pDependencies = 0;
 
@@ -148,13 +153,13 @@ public class AssignableTaskConversion {
             pTasks++;
 
 
-            /*System.err.printf("\t\tTasks: %d, " +
+            /*System.out.printf("\t\tTasks: %d, " +
                                   "Dependencies: %d, " +
                                   "Assignments: %d\n",
                                   pTasks, pDependencies, pAssignments);*/
         }
 
-        System.err.printf("\t\tCreated %d assignable tasks and\n" +
+        System.out.printf("\t\tCreated %d assignable tasks and\n" +
                           "\t\tCreated %d task dependencies and\n" +
                           "\t\tcreated %d task assignments.\n",
                           pTasks, pDependencies, pAssignments);
@@ -172,7 +177,7 @@ public class AssignableTaskConversion {
      * @param dependencyIt An iterator representing all dependencies of the
      *                     given assignableTask
      */
-    private static long createTaskDependencies(AssignableTask assignableTask,
+    private long createTaskDependencies(AssignableTask assignableTask,
                                                Iterator dependencyIt) {
 
         int processed = 0;
@@ -211,7 +216,7 @@ public class AssignableTaskConversion {
      *                        {@link com.arsdigita.kernel.Role}s belonging to
      *                        the assignableTask
      */
-    private static long  createTaskAssignments(AssignableTask assignableTask,
+    private long  createTaskAssignments(AssignableTask assignableTask,
                                               GroupCollection groupCollection) {
         int processed = 0;
 
@@ -245,7 +250,7 @@ public class AssignableTaskConversion {
      * Runs once over the unsorted map and iterates over each their dependencies
      * to add them to the sorted list.
      */
-    private static void sortAssignableTaskMap() {
+    private void sortAssignableTaskMap() {
         ArrayList<AssignableTask> sortedList = new ArrayList<>();
 
         int runs = 0;
@@ -262,7 +267,7 @@ public class AssignableTaskConversion {
         }
         NgCoreCollection.sortedAssignableTasks = sortedList;
 
-        System.err.printf("\t\tSorted assignable tasks in %d runs.\n", runs);
+        System.out.printf("\t\tSorted assignable tasks in %d runs.\n", runs);
     }
 
     /**
@@ -273,7 +278,7 @@ public class AssignableTaskConversion {
      * @param sortedList List of already sorted tasks
      * @param assignableTask Current assignable task
      */
-    private static void addDependencies(ArrayList<AssignableTask> sortedList,
+    private void addDependencies(ArrayList<AssignableTask> sortedList,
                                         AssignableTask assignableTask) {
         List<TaskDependency> dependencies = assignableTask.getBlockingTasks();
 
@@ -290,4 +295,13 @@ public class AssignableTaskConversion {
             }
         }
     }
+
+    /**
+     * Getter for the instance of the singleton.
+     *
+     * @return instance of this singleton
+     */
+    public static AssignableTaskConversion getInstance() {
+        return instance;
+    }
 }

ccm-core/src/com/arsdigita/portation/conversion/core/workflow/TaskCommentConversion.java

@@ -18,6 +18,7 @@
  */
 package com.arsdigita.portation.conversion.core.workflow;
 
+import com.arsdigita.portation.AbstractConversion;
 import com.arsdigita.portation.conversion.NgCoreCollection;
 import com.arsdigita.portation.modules.core.security.User;
 import com.arsdigita.portation.modules.core.workflow.TaskComment;
@@ -33,7 +34,12 @@ import java.util.List;
  * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers<\a>
  * @version created the 9/27/17
  */
-public class TaskCommentConversion {
+public class TaskCommentConversion extends AbstractConversion {
+    private static TaskCommentConversion instance;
+
+    static {
+        instance = new TaskCommentConversion();
+    }
 
     /**
      * Retrieves all trunk-{@link com.arsdigita.workflow.simple.TaskComment}s
@@ -41,15 +47,16 @@ public class TaskCommentConversion {
      * creating the equivalent ng-{@link TaskComment}s focusing on keeping
      * all the associations in tact.
      */
-    public static void convertAll() {
+    @Override
-        System.err.printf("\tFetching task comments from database...");
+    public void convertAll() {
+        System.out.print("\tFetching task comments from database...");
         List<com.arsdigita.workflow.simple.TaskComment> trunkTaskComments = com
                 .arsdigita.workflow.simple.TaskComment.getAllTaskComments();
-        System.err.println("done.");
+        System.out.println("done.");
 
-        System.err.printf("\tConverting task comments...\n");
+        System.out.print("\tConverting task comments...\n");
         createTaskCommentsAndSetAssociations(trunkTaskComments);
-        System.err.println("\tdone.\n");
+        System.out.println("\tdone.\n");
 
     }
 
@@ -61,7 +68,7 @@ public class TaskCommentConversion {
      *                       {@link com.arsdigita.workflow.simple.TaskComment}s
      *                       from this old trunk-system.
      */
-    private static void createTaskCommentsAndSetAssociations(
+    private void createTaskCommentsAndSetAssociations(
             List<com.arsdigita.workflow.simple.TaskComment> trunkTaskComments) {
         int processed = 0;
 
@@ -82,6 +89,15 @@ public class TaskCommentConversion {
             processed++;
         }
 
-        System.err.printf("\t\tCreated %d task comments.\n", processed);
+        System.out.printf("\t\tCreated %d task comments.\n", processed);
+    }
+
+    /**
+     * Getter for the instance of the singleton.
+     *
+     * @return instance of this singleton
+     */
+    public static TaskCommentConversion getInstance() {
+        return instance;
     }
 }

ccm-core/src/com/arsdigita/portation/conversion/core/workflow/WorkflowConversion.java

@@ -19,6 +19,7 @@
 package com.arsdigita.portation.conversion.core.workflow;
 
 import com.arsdigita.kernel.ACSObject;
+import com.arsdigita.portation.AbstractConversion;
 import com.arsdigita.portation.conversion.NgCoreCollection;
 import com.arsdigita.portation.modules.core.categorization.Category;
 import com.arsdigita.portation.modules.core.core.CcmObject;
@@ -39,26 +40,32 @@ import java.util.Map;
  * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers</a>
  * @version created on 27.6.16
  */
-public class WorkflowConversion {
+public class WorkflowConversion extends AbstractConversion {
+    private static WorkflowConversion instance;
+
+    static {
+        instance = new WorkflowConversion();
+    }
 
     /**
      * Retrieves all trunk-{@link com.arsdigita.workflow.simple.Workflow}s from
      * the persistent storage and collects them in a list. Then calls for
      * creating the equivalent ng-{@link Workflow}s.
      */
-    public static void convertAll() {
+    @Override
-        System.err.printf("\tFetching workflows from database...");
+    public void convertAll() {
+        System.out.print("\tFetching workflows from database...");
         List<com.arsdigita.workflow.simple.Workflow> trunkWorkflows =
                 com.arsdigita.workflow.simple.Workflow.getAllObjectWorkflows();
-        System.err.println("done.");
+        System.out.println("done.");
 
-        System.err.printf("\tConverting workflows...\n");
+        System.out.print("\tConverting workflows...\n");
         createWorkflowAndSetAssociations(trunkWorkflows);
         setTemplateAssociations(trunkWorkflows);
-        System.err.printf("\tSorting workflows...\n");
+        System.out.print("\tSorting workflows...\n");
         sortWorkflowMap();
 
-        System.err.println("\tdone.\n");
+        System.out.println("\tdone.\n");
     }
 
     /**
@@ -69,7 +76,7 @@ public class WorkflowConversion {
      *                       {@link com.arsdigita.workflow.simple.Workflow}s
      *                       from this old trunk-system.
      */
-    private static void createWorkflowAndSetAssociations(
+    private void createWorkflowAndSetAssociations(
             List<com.arsdigita.workflow.simple.Workflow> trunkWorkflows) {
         int processed = 0;
 
@@ -90,7 +97,7 @@ public class WorkflowConversion {
             processed++;
         }
 
-        System.err.printf("\t\tCreated %d workflows.\n", processed);
+        System.out.printf("\t\tCreated %d workflows.\n", processed);
     }
 
     /**
@@ -101,7 +108,7 @@ public class WorkflowConversion {
      *                       {@link com.arsdigita.workflow.simple.Workflow}s
      *                       from this old trunk-system.
      */
-    private static void setTemplateAssociations(
+    private void setTemplateAssociations(
             List<com.arsdigita.workflow.simple.Workflow> trunkWorkflows) {
         int processed = 0;
 
@@ -123,7 +130,7 @@ public class WorkflowConversion {
             } else
                 processed++;
         }
-        System.err.printf("\t\tFound %d templates.\n", processed);
+        System.out.printf("\t\tFound %d templates.\n", processed);
     }
 
     /**
@@ -134,7 +141,7 @@ public class WorkflowConversion {
      * Runs once over the unsorted list and iterates over each their templates
      * to add them to the sorted list.
      */
-    private static void sortWorkflowMap() {
+    private void sortWorkflowMap() {
         ArrayList<Workflow> sortedList = new ArrayList<>();
 
         int runs = 0;
@@ -150,7 +157,7 @@ public class WorkflowConversion {
         }
         NgCoreCollection.sortedWorkflows = sortedList;
 
-        System.err.printf("\t\tSorted workflows in %d runs.\n", runs);
+        System.out.printf("\t\tSorted workflows in %d runs.\n", runs);
     }
 
     /**
@@ -160,7 +167,7 @@ public class WorkflowConversion {
      * @param sortedList List of already sorted workflows
      * @param workflow Current workflow
      */
-    private static void addTemplate(ArrayList<Workflow> sortedList, Workflow
+    private void addTemplate(ArrayList<Workflow> sortedList, Workflow
             workflow) {
         Workflow template = workflow.getTemplate();
 
@@ -171,4 +178,13 @@ public class WorkflowConversion {
                 sortedList.add(template);
         }
     }
+
+    /**
+     * Getter for the instance of the singleton.
+     *
+     * @return instance of this singleton
+     */
+    public static WorkflowConversion getInstance() {
+        return instance;
+    }
 }

ccm-core/src/com/arsdigita/portation/modules/CoreExporter.java

@@ -36,161 +36,52 @@ import java.util.ArrayList;
  * @version created on 25.07.2016
  */
 public class CoreExporter extends AbstractExporter {
-    public static void startExport() {
-        exportUsers();
-        exportGroups();
-        exportGroupMemberships();
-        exportRoles();
-        exportRoleMemberships();
 
-        exportCategories();
+    private static CoreExporter instance;
-        exportCategorizations();
 
-        exportPermissions();
+    static {
-
+        instance = new CoreExporter();
-        exportWorkflows();
-        exportTaskComments();
-        exportAssignableTasks();
-        exportTaskDependencies();
-        exportTaskAssignments();
     }
 
-
+    /**
-    private static void exportUsers() {
+     * Getter for the instance of the singleton.
-        System.out.printf("\tExporting users...");
+     *
-        UserMarshaller userMarshaller = new UserMarshaller();
+     * @return instance of this singleton
-        userMarshaller.prepare(
+     */
-                Format.XML, pathName, "users", indentation);
+    public static CoreExporter getInstance() {
-        userMarshaller.exportList(
+        return instance;
-                new ArrayList<>(NgCoreCollection.users.values()));
-        System.out.printf("\t\tdone.\n");
     }
 
-    private static void exportGroups() {
+    @Override
-        System.out.printf("\tExporting groups...");
+    public void startMarshaller() {
-        GroupMarshaller groupMarshaller = new GroupMarshaller();
+        UserMarshaller.getInstance().
-        groupMarshaller.prepare(
+                marshallAll(format, pathName, indentation);
-                Format.XML, pathName, "groups", indentation);
+        GroupMarshaller.getInstance().
-        groupMarshaller.exportList(
+                marshallAll(format, pathName, indentation);
-                new ArrayList<>(NgCoreCollection.groups.values()));
+        GroupMembershipMarshaller.getInstance().
-        System.out.printf("\t\tdone.\n");
+                marshallAll(format, pathName, indentation);
-    }
+        RoleMarshaller.getInstance().
+                marshallAll(format, pathName, indentation);
+        RoleMembershipMarshaller.getInstance().
+                marshallAll(format, pathName, indentation);
 
-    private static void exportGroupMemberships() {
+        CategoryMarshaller.getInstance().
-        System.out.printf("\tExporting group memberships...");
+                marshallAll(format, pathName, indentation);
-        GroupMembershipMarshaller groupMembershipMarshaller = new
+        CategorizationMarshaller.getInstance().
-                GroupMembershipMarshaller();
+                marshallAll(format, pathName, indentation);
-        groupMembershipMarshaller.prepare(
-                Format.XML, pathName, "groupMemberships", indentation);
-        groupMembershipMarshaller.exportList(
-                new ArrayList<>(NgCoreCollection.groupMemberships.values()));
-        System.out.printf("\tdone.\n");
-    }
 
-    private static void exportRoles() {
+        PermissionMarshaller.getInstance().
-        System.out.printf("\tExporting roles...");
+                marshallAll(format, pathName, indentation);
-        RoleMarshaller roleMarshaller = new RoleMarshaller();
-        roleMarshaller.prepare(
-                Format.XML, pathName, "roles", indentation);
-        roleMarshaller.exportList(
-                new ArrayList<>(NgCoreCollection.roles.values()));
-        System.out.printf("\t\tdone.\n");
-    }
 
-    private static void exportRoleMemberships() {
+        WorkflowMarshaller.getInstance().
-        System.out.printf("\tExporting role memberships...");
+                marshallAll(format, pathName, indentation);
-        RoleMembershipMarshaller roleMembershipMarshaller = new
+        TaskCommentMarshaller.getInstance().
-                RoleMembershipMarshaller();
+                marshallAll(format, pathName, indentation);
-        roleMembershipMarshaller.prepare(
+        AssignableTaskMarshaller.getInstance().
-                Format.XML, pathName, "roleMemberships", indentation);
+                marshallAll(format, pathName, indentation);
-        roleMembershipMarshaller.exportList(
+        TaskDependencyMarshaller.getInstance().
-                new ArrayList<>(NgCoreCollection.roleMemberships.values()));
+                marshallAll(format, pathName, indentation);
-        System.out.printf("\tdone.\n");
+        TaskAssignmentMarshaller.getInstance().
-    }
+                marshallAll(format, pathName, indentation);
-
-    private static void exportCategories() {
-        System.out.printf("\tExporting categories...");
-        CategoryMarshaller categoryMarshaller = new CategoryMarshaller();
-        categoryMarshaller.prepare(
-                Format.XML, pathName, "categories", indentation);
-        categoryMarshaller.exportList(
-                NgCoreCollection.sortedCategories);
-        System.out.printf("\t\tdone.\n");
-    }
-
-    private static void exportCategorizations() {
-        System.out.printf("\tExporting categorizations...");
-        CategorizationMarshaller categorizationMarshaller = new
-                CategorizationMarshaller();
-        categorizationMarshaller.prepare(
-                Format.XML, pathName, "categorizations", indentation);
-        categorizationMarshaller.exportList(
-                new ArrayList<>(NgCoreCollection.categorizations.values()));
-        System.out.printf("\tdone.\n");
-    }
-
-    private static void exportPermissions() {
-        System.out.printf("\tExporting permissions...");
-        PermissionMarshaller permissionMarshaller = new
-                PermissionMarshaller();
-        permissionMarshaller.prepare(
-                Format.XML, pathName, "permissions", indentation);
-        permissionMarshaller.exportList(
-                new ArrayList<>(NgCoreCollection.permissions.values()));
-        System.out.printf("\tdone.\n");
-    }
-
-    private static void exportWorkflows() {
-        System.out.printf("\tExporting workflows...");
-        WorkflowMarshaller workflowMarshaller = new WorkflowMarshaller();
-        workflowMarshaller.prepare(
-                Format.XML, pathName, "workflows", indentation);
-        workflowMarshaller.exportList(
-                NgCoreCollection.sortedWorkflows);
-        System.out.printf("\t\tdone.\n");
-    }
-
-    private static void exportTaskComments() {
-        System.out.printf("\tExporting task comments...");
-        TaskCommentMarshaller taskCommentMarshaller = new
-                TaskCommentMarshaller();
-        taskCommentMarshaller.prepare(
-                Format.XML, pathName, "taskComments", indentation);
-        taskCommentMarshaller.exportList(
-                new ArrayList<>(NgCoreCollection.taskComments.values()));
-        System.out.printf("\tdone.\n");
-    }
-
-    private static void exportAssignableTasks() {
-        System.out.printf("\tExporting assignable tasks...");
-        AssignableTaskMarshaller assignableTaskMarshaller = new
-                AssignableTaskMarshaller();
-        assignableTaskMarshaller.prepare(
-                Format.XML, pathName, "assignableTasks", indentation);
-        assignableTaskMarshaller.exportList(
-                NgCoreCollection.sortedAssignableTasks);
-        System.out.printf("\tdone.\n");
-    }
-
-    private static void exportTaskDependencies() {
-        System.out.printf("\tExporting task dependencies...");
-        TaskDependencyMarshaller taskDependencyMarshaller = new
-                TaskDependencyMarshaller();
-        taskDependencyMarshaller.prepare(
-                Format.XML, pathName, "taskDependencies", indentation);
-        taskDependencyMarshaller.exportList(
-                new ArrayList<>(NgCoreCollection.taskDependencies.values()));
-        System.out.printf("\tdone.\n");
-    }
-
-    private static void exportTaskAssignments() {
-        System.out.printf("\tExporting task assignments...");
-        TaskAssignmentMarshaller taskAssignmentMarshaller = new
-                TaskAssignmentMarshaller();
-        taskAssignmentMarshaller.prepare(
-                Format.XML, pathName, "taskAssignments", indentation);
-        taskAssignmentMarshaller.exportList(
-                new ArrayList<>(NgCoreCollection.taskAssignments.values()));
-        System.out.printf("\tdone.\n");
     }
 }

ccm-core/src/com/arsdigita/portation/modules/core/categorization/CategorizationMarshaller.java

@@ -7,7 +7,7 @@
  * version 2.1 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * but WITHerr ANY WARRANTY; witherr even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
@@ -19,10 +19,49 @@
 package com.arsdigita.portation.modules.core.categorization;
 
 import com.arsdigita.portation.AbstractMarshaller;
+import com.arsdigita.portation.Format;
+import com.arsdigita.portation.conversion.NgCoreCollection;
+
+import java.util.ArrayList;
 
 /**
  * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers<\a>
  * @version created on 6/15/16
  */
 public class CategorizationMarshaller extends AbstractMarshaller<Categorization> {
+    private static CategorizationMarshaller instance;
+
+    static {
+        instance = new CategorizationMarshaller();
+    }
+
+    /**
+     * Getter for the instance of this singleton
+     *
+     * @return instance of the singleton
+     */
+    public static CategorizationMarshaller getInstance() {
+        return instance;
+    }
+
+    /**
+     * Passes the parameters for the file to which the {@link Categorization}-
+     * objects will be exported to down to its corresponding
+     * {@link AbstractMarshaller<Categorization>} and then requests this
+     * {@link AbstractMarshaller<Categorization>} to start the export of all
+     * its {@link Categorization}s.
+     *
+     * @param format The format of the file to which will be exported to
+     * @param pathName The name for the file
+     * @param indentation Whether to use indentation in the file
+     */
+    @Override
+    public void marshallAll(final Format format,
+                            final String pathName,
+                            final boolean indentation) {
+        System.out.print("\tExporting categorizations...");
+        prepare(format, pathName, "categorizations", indentation);
+        exportList(new ArrayList<>(NgCoreCollection.categorizations.values()));
+        System.out.print("\tdone.\n");
+    }
 }

ccm-core/src/com/arsdigita/portation/modules/core/categorization/CategoryMarshaller.java

@@ -19,10 +19,47 @@
 package com.arsdigita.portation.modules.core.categorization;
 
 import com.arsdigita.portation.AbstractMarshaller;
+import com.arsdigita.portation.Format;
+import com.arsdigita.portation.conversion.NgCoreCollection;
 
 /**
  * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers<\a>
  * @version created on 6/15/16
  */
 public class CategoryMarshaller extends AbstractMarshaller<Category> {
+    private static CategoryMarshaller instance;
+
+    static {
+        instance = new CategoryMarshaller();
+    }
+
+    /**
+     * Gertter for the instance of the singleton
+     *
+     * @return instance of the singleton
+     */
+    public static CategoryMarshaller getInstance() {
+        return instance;
+    }
+
+    /**
+     * Passes the parameters for the file to which the {@link Category}-objects
+     * will be exported to down to its corresponding
+     * {@link AbstractMarshaller<Category>} and then requests this
+     * {@link AbstractMarshaller<Category>} to start the export of all its
+     * {@link Category}s.
+     *
+     * @param format The format of the file to which will be exported to
+     * @param pathName The name for the file
+     * @param indentation Whether to use indentation in the file
+     */
+    @Override
+    public void marshallAll(final Format format,
+                            final String pathName,
+                            final boolean indentation) {
+        System.out.print("\tExporting categories...");
+        prepare(format, pathName, "categories", indentation);
+        exportList(NgCoreCollection.sortedCategories);
+        System.out.print("\t\tdone.\n");
+    }
 }

ccm-core/src/com/arsdigita/portation/modules/core/security/GroupMarshaller.java

@@ -19,10 +19,49 @@
 package com.arsdigita.portation.modules.core.security;
 
 import com.arsdigita.portation.AbstractMarshaller;
+import com.arsdigita.portation.Format;
+import com.arsdigita.portation.conversion.NgCoreCollection;
+
+import java.util.ArrayList;
 
 /**
  * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers<\a>
  * @version created on 01.06.16
  */
 public class GroupMarshaller extends AbstractMarshaller<Group> {
+    private static GroupMarshaller instance;
+
+    static {
+        instance = new GroupMarshaller();
+    }
+
+    /**
+     * Getter for the instance of the singleton.
+     *
+     * @return instance of this singleton
+     */
+    public static GroupMarshaller getInstance() {
+        return instance;
+    }
+
+    /**
+     * Passes the parameters for the file to which the {@link Group}-objects
+     * will be exported to down to its corresponding
+     * {@link AbstractMarshaller<Group>} and then requests this
+     * {@link AbstractMarshaller<Group>} to start the export of all its
+     * {@link User}s.
+     *
+     * @param format The format of the file to which will be exported to
+     * @param pathName The name for the file
+     * @param indentation Whether to use indentation in the file
+     */
+    @Override
+    public void marshallAll(final Format format,
+                            final String pathName,
+                            final boolean indentation) {
+        System.out.print("\tExporting groups...");
+        prepare(format, pathName, "groups", indentation);
+        exportList(new ArrayList<>(NgCoreCollection.groups.values()));
+        System.out.print("\t\tdone.\n");
+    }
 }

ccm-core/src/com/arsdigita/portation/modules/core/security/GroupMembershipMarshaller.java

@@ -19,10 +19,49 @@
 package com.arsdigita.portation.modules.core.security;
 
 import com.arsdigita.portation.AbstractMarshaller;
+import com.arsdigita.portation.Format;
+import com.arsdigita.portation.conversion.NgCoreCollection;
+
+import java.util.ArrayList;
 
 /**
  * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers<\a>
  * @version created on 6/15/16
  */
 public class GroupMembershipMarshaller extends AbstractMarshaller<GroupMembership> {
+    private static GroupMembershipMarshaller instance;
+
+    static {
+        instance = new GroupMembershipMarshaller();
+    }
+
+    /**
+     * Getter for the instance of the singleton.
+     *
+     * @return instance of this singleton
+     */
+    public static GroupMembershipMarshaller getInstance() {
+        return instance;
+    }
+
+    /**
+     * Passes the parameters for the file to which the {@link GroupMembership}
+     * -objects will be exported to down to its corresponding
+     * {@link AbstractMarshaller<GroupMembership>} and then requests this
+     * {@link AbstractMarshaller<GroupMembership>} to start the export of all
+     * its {@link GroupMembership}s.
+     *
+     * @param format The format of the file to which will be exported to
+     * @param pathName The name for the file
+     * @param indentation Whether to use indentation in the file
+     */
+    @Override
+    public void marshallAll(final Format format,
+                            final String pathName,
+                            final boolean indentation) {
+        System.out.print("\tExporting group memberships...");
+        prepare(format, pathName, "groupMemberships", indentation);
+        exportList(new ArrayList<>(NgCoreCollection.groupMemberships.values()));
+        System.out.print("\tdone.\n");
+    }
 }

ccm-core/src/com/arsdigita/portation/modules/core/security/PermissionMarshaller.java

@@ -19,10 +19,49 @@
 package com.arsdigita.portation.modules.core.security;
 
 import com.arsdigita.portation.AbstractMarshaller;
+import com.arsdigita.portation.Format;
+import com.arsdigita.portation.conversion.NgCoreCollection;
+
+import java.util.ArrayList;
 
 /**
  * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers<\a>
  * @version created on 6/15/16
  */
 public class PermissionMarshaller extends AbstractMarshaller<Permission> {
+    private static PermissionMarshaller instance;
+
+    static {
+        instance = new PermissionMarshaller();
+    }
+
+    /**
+     * Getter for instance of this singleton.
+     *
+     * @return instance of the singleton
+     */
+    public static PermissionMarshaller getInstance() {
+        return instance;
+    }
+
+    /**
+     * Passes the parameters for the file to which the {@link Permission}-
+     * objects will be exported to down to its corresponding
+     * {@link AbstractMarshaller<Permission>} and then requests this
+     * {@link AbstractMarshaller<Permission>} to start the export of all its
+     * {@link Permission}s.
+     *
+     * @param format The format of the file to which will be exported to
+     * @param pathName The name for the file
+     * @param indentation Whether to use indentation in the file
+     */
+    @Override
+    public void marshallAll(final Format format,
+                            final String pathName,
+                            final boolean indentation) {
+        System.out.print("\tExporting permissions...");
+        prepare(format, pathName, "permissions", indentation);
+        exportList(new ArrayList<>(NgCoreCollection.permissions.values()));
+        System.out.print("\tdone.\n");
+    }
 }

ccm-core/src/com/arsdigita/portation/modules/core/security/RoleMarshaller.java

@@ -19,10 +19,49 @@
 package com.arsdigita.portation.modules.core.security;
 
 import com.arsdigita.portation.AbstractMarshaller;
+import com.arsdigita.portation.Format;
+import com.arsdigita.portation.conversion.NgCoreCollection;
+
+import java.util.ArrayList;
 
 /**
  * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers<\a>
  * @version created on 6/15/16
  */
 public class RoleMarshaller extends AbstractMarshaller<Role> {
+    private static RoleMarshaller instance;
+
+    static {
+        instance = new RoleMarshaller();
+    }
+
+    /**
+     * Getter for the instance of the singleton.
+     *
+     * @return instance of this singleton
+     */
+    public static RoleMarshaller getInstance() {
+        return instance;
+    }
+
+    /**
+     * Passes the parameters for the file to which the {@link Role}-objects
+     * will be exported to down to its corresponding
+     * {@link AbstractMarshaller<Role>} and then requests this
+     * {@link AbstractMarshaller<Role>} to start the export of all its
+     * {@link Role}s.
+     *
+     * @param format The format of the file to which will be exported to
+     * @param pathName The name for the file
+     * @param indentation Whether to use indentation in the file
+     */
+    @Override
+    public void marshallAll(final Format format,
+                            final String pathName,
+                            final boolean indentation) {
+        System.out.print("\tExporting roles...");
+        prepare(format, pathName, "roles", indentation);
+        exportList(new ArrayList<>(NgCoreCollection.roles.values()));
+        System.out.print("\t\tdone.\n");
+    }
 }

ccm-core/src/com/arsdigita/portation/modules/core/security/RoleMembershipMarshaller.java

@@ -19,10 +19,49 @@
 package com.arsdigita.portation.modules.core.security;
 
 import com.arsdigita.portation.AbstractMarshaller;
+import com.arsdigita.portation.Format;
+import com.arsdigita.portation.conversion.NgCoreCollection;
+
+import java.util.ArrayList;
 
 /**
  * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers<\a>
  * @version created on 6/15/16
  */
 public class RoleMembershipMarshaller extends AbstractMarshaller<RoleMembership> {
+    private static RoleMembershipMarshaller instance;
+
+    static {
+        instance = new RoleMembershipMarshaller();
+    }
+
+    /**
+     * Getter for the instance of the singleton.
+     *
+     * @return instance of this singleton
+     */
+    public static RoleMembershipMarshaller getInstance() {
+        return instance;
+    }
+
+    /**
+     * Passes the parameters for the file to which the {@link RoleMembership}
+     * -objects will be exported to down to its corresponding
+     * {@link AbstractMarshaller<RoleMembership>} and then requests this
+     * {@link AbstractMarshaller<RoleMembership>} to start the export of all
+     * its {@link RoleMembership}s.
+     *
+     * @param format The format of the file to which will be exported to
+     * @param pathName The name for the file
+     * @param indentation Whether to use indentation in the file
+     */
+    @Override
+    public void marshallAll(final Format format,
+                            final String pathName,
+                            final boolean indentation) {
+        System.out.print("\tExporting role memberships...");
+        prepare(format, pathName, "roleMemberships", indentation);
+        exportList(new ArrayList<>(NgCoreCollection.roleMemberships.values()));
+        System.out.print("\tdone.\n");
+    }
 }

ccm-core/src/com/arsdigita/portation/modules/core/security/UserMarshaller.java

@@ -19,10 +19,48 @@
 package com.arsdigita.portation.modules.core.security;
 
 import com.arsdigita.portation.AbstractMarshaller;
+import com.arsdigita.portation.Format;
+import com.arsdigita.portation.conversion.NgCoreCollection;
+
+import java.util.ArrayList;
 
 /**
  * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers<\a>
  * @version created on 25.05.16
  */
 public class UserMarshaller extends AbstractMarshaller<User> {
+    private static UserMarshaller instance;
+
+    static {
+        instance = new UserMarshaller();
+    }
+
+    /**
+     * Getter for the instance of the singleton.
+     *
+     * @return instance of this singleton
+     */
+    public static UserMarshaller getInstance() {
+        return instance;
+    }
+
+    /**
+     * Passes the parameters for the file to which the {@link User}-objects will
+     * be exported to down to its corresponding {@link AbstractMarshaller<User>}
+     * and then requests this {@link AbstractMarshaller<User>} to start the
+     * export of all its {@link User}s.
+     *
+     * @param format The format of the file to which will be exported to
+     * @param pathName The name for the file
+     * @param indentation Whether to use indentation in the file
+     */
+    @Override
+    public void marshallAll(final Format format,
+                            final String pathName,
+                            final boolean indentation) {
+        System.out.print("\tExporting users...");
+        prepare(format, pathName, "users", indentation);
+        exportList(new ArrayList<>(NgCoreCollection.users.values()));
+        System.out.print("\t\tdone.\n");
+    }
 }

ccm-core/src/com/arsdigita/portation/modules/core/workflow/AssignableTaskMarshaller.java

@@ -19,10 +19,47 @@
 package com.arsdigita.portation.modules.core.workflow;
 
 import com.arsdigita.portation.AbstractMarshaller;
+import com.arsdigita.portation.Format;
+import com.arsdigita.portation.conversion.NgCoreCollection;
 
 /**
  * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers<\a>
  * @version created on 6/15/16
  */
 public class AssignableTaskMarshaller extends AbstractMarshaller<AssignableTask> {
+    private static AssignableTaskMarshaller instance;
+
+    static {
+        instance = new AssignableTaskMarshaller();
+    }
+
+    /**
+     * Getter for the instance of this singleton.
+     *
+     * @return instance of the singleton
+     */
+    public static AssignableTaskMarshaller getInstance() {
+        return instance;
+    }
+
+    /**
+     * Passes the parameters for the file to which the {@link AssignableTask}-
+     * objects will be exported to down to its corresponding
+     * {@link AbstractMarshaller<AssignableTask>} and then requests this
+     * {@link AbstractMarshaller<AssignableTask>} to start the export of all
+     * its {@link AssignableTask}s.
+     *
+     * @param format The format of the file to which will be exported to
+     * @param pathName The name for the file
+     * @param indentation Whether to use indentation in the file
+     */
+    @Override
+    public void marshallAll(final Format format,
+                            final String pathName,
+                            final boolean indentation) {
+        System.out.print("\tExporting assignable tasks...");
+        prepare(format, pathName, "assignableTasks", indentation);
+        exportList(NgCoreCollection.sortedAssignableTasks);
+        System.out.print("\tdone.\n");
+    }
 }

ccm-core/src/com/arsdigita/portation/modules/core/workflow/TaskAssignmentMarshaller.java

@@ -19,10 +19,50 @@
 package com.arsdigita.portation.modules.core.workflow;
 
 import com.arsdigita.portation.AbstractMarshaller;
+import com.arsdigita.portation.Format;
+import com.arsdigita.portation.conversion.NgCoreCollection;
+
+import java.util.ArrayList;
 
 /**
  * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers<\a>
  * @version created on 6/15/16
  */
 public class TaskAssignmentMarshaller extends AbstractMarshaller<TaskAssignment> {
+    private static TaskAssignmentMarshaller instance;
+
+    static {
+        instance = new TaskAssignmentMarshaller();
+    }
+
+    /**
+     * Getter for the instance of this singleton.
+     *
+     * @return instance of the singleton
+     */
+    public static TaskAssignmentMarshaller getInstance() {
+        return instance;
+    }
+
+    /**
+     * Passes the parameters for the file to which the {@link TaskAssignment}-
+     * objects will be exported to down to its corresponding
+     * {@link AbstractMarshaller<TaskAssignment>} and then requests this
+     * {@link AbstractMarshaller<TaskAssignment>} to start the export of all
+     * its {@link TaskAssignment}s.
+     *
+     * @param format The format of the file to which will be exported to
+     * @param pathName The name for the file
+     * @param indentation Whether to use indentation in the file
+     */
+    @Override
+    public void marshallAll(final Format format,
+                            final String pathName,
+                            final boolean indentation) {
+        System.out.print("\tExporting task assignments...");
+        prepare(format, pathName, "taskAssignments", indentation);
+        exportList(new ArrayList<>(NgCoreCollection.taskAssignments.values()));
+        System.out.print("\tdone.\n");
+
+    }
 }

ccm-core/src/com/arsdigita/portation/modules/core/workflow/TaskCommentMarshaller.java

@@ -19,10 +19,49 @@
 package com.arsdigita.portation.modules.core.workflow;
 
 import com.arsdigita.portation.AbstractMarshaller;
+import com.arsdigita.portation.Format;
+import com.arsdigita.portation.conversion.NgCoreCollection;
+
+import java.util.ArrayList;
 
 /**
  * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers<\a>
  * @version created the 9/27/17
  */
 public class TaskCommentMarshaller extends AbstractMarshaller<TaskComment> {
+    private static TaskCommentMarshaller instance;
+
+    static {
+        instance = new TaskCommentMarshaller();
+    }
+
+    /**
+     * Getter for the instance of this singleton.
+     *
+     * @return instance of the singleton
+     */
+    public static TaskCommentMarshaller getInstance() {
+        return instance;
+    }
+
+    /**
+     * Passes the parameters for the file to which the {@link TaskComment}-
+     * objects will be exported to down to its corresponding
+     * {@link AbstractMarshaller<TaskComment>} and then requests this
+     * {@link AbstractMarshaller<TaskComment>} to start the export of all its
+     * {@link TaskComment}s.
+     *
+     * @param format The format of the file to which will be exported to
+     * @param pathName The name for the file
+     * @param indentation Whether to use indentation in the file
+     */
+    @Override
+    public void marshallAll(final Format format,
+                            final String pathName,
+                            final boolean indentation) {
+        System.out.print("\tExporting task comments...");
+        prepare(format, pathName, "taskComments", indentation);
+        exportList(new ArrayList<>(NgCoreCollection.taskComments.values()));
+        System.out.print("\tdone.\n");
+    }
 }

ccm-core/src/com/arsdigita/portation/modules/core/workflow/TaskDependencyMarshaller.java

@@ -7,7 +7,7 @@
  * version 2.1 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * but WITHerr ANY WARRANTY; witherr even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
@@ -19,6 +19,10 @@
 package com.arsdigita.portation.modules.core.workflow;
 
 import com.arsdigita.portation.AbstractMarshaller;
+import com.arsdigita.portation.Format;
+import com.arsdigita.portation.conversion.NgCoreCollection;
+
+import java.util.ArrayList;
 
 /**
  * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers<\a>
@@ -26,4 +30,39 @@ import com.arsdigita.portation.AbstractMarshaller;
  */
 public class TaskDependencyMarshaller extends
         AbstractMarshaller<TaskDependency> {
+    private static TaskDependencyMarshaller instance;
+
+    static {
+        instance = new TaskDependencyMarshaller();
+    }
+
+    /**
+     * Getter for the instance of this singleton.
+     *
+     * @return instance of the singleton
+     */
+    public static TaskDependencyMarshaller getInstance() {
+        return instance;
+    }
+
+    /**
+     * Passes the parameters for the file to which the {@link TaskDependency}-
+     * objects will be exported to down to its corresponding
+     * {@link AbstractMarshaller<TaskDependency>} and then requests this
+     * {@link AbstractMarshaller<TaskDependency>} to start the export of all
+     * its {@link TaskDependency}s.
+     *
+     * @param format The format of the file to which will be exported to
+     * @param pathName The name for the file
+     * @param indentation Whether to use indentation in the file
+     */
+    @Override
+    public void marshallAll(final Format format,
+                            final String pathName,
+                            final boolean indentation) {
+        System.out.print("\tExporting task dependencies...");
+        prepare(format, pathName, "taskDependencies", indentation);
+        exportList(new ArrayList<>(NgCoreCollection.taskDependencies.values()));
+        System.out.print("\tdone.\n");
+    }
 }

ccm-core/src/com/arsdigita/portation/modules/core/workflow/WorkflowMarshaller.java

@@ -19,10 +19,47 @@
 package com.arsdigita.portation.modules.core.workflow;
 
 import com.arsdigita.portation.AbstractMarshaller;
+import com.arsdigita.portation.Format;
+import com.arsdigita.portation.conversion.NgCoreCollection;
 
 /**
  * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers<\a>
  * @version created on 6/15/16
  */
 public class WorkflowMarshaller extends AbstractMarshaller<Workflow> {
+    private static WorkflowMarshaller instance;
+
+    static {
+        instance = new WorkflowMarshaller();
+    }
+
+    /**
+     * Getter for the instance of this singleton.
+     *
+     * @return instance of the singleton
+     */
+    public static WorkflowMarshaller getInstance() {
+        return instance;
+    }
+
+    /**
+     * Passes the parameters for the file to which the {@link Workflow}-objects
+     * will be exported to down to its corresponding
+     * {@link AbstractMarshaller<Workflow>} and then requests this
+     * {@link AbstractMarshaller<Workflow>} to start the export of all its
+     * {@link Workflow}s.
+     *
+     * @param format The format of the file to which will be exported to
+     * @param pathName The name for the file
+     * @param indentation Whether to use indentation in the file
+     */
+    @Override
+    public void marshallAll(final Format format,
+                            final String pathName,
+                            final boolean indentation) {
+        System.out.print("\tExporting workflows...");
+        prepare(format, pathName, "workflows", indentation);
+        exportList(NgCoreCollection.sortedWorkflows);
+        System.out.print("\t\tdone.\n");
+    }
 }

ccm-ldn-terms/src/com/arsdigita/london/terms/portation/conversion/LdnTermsConverter.java

@@ -40,18 +40,6 @@ public class LdnTermsConverter extends AbstractConverter {
         instance = new LdnTermsConverter();
     }
 
-    /**
-     * Method, to start all the different converter classes in a specific
-     * order, so that dependencies can only be set, where the objects have
-     * already been created.
-     */
-    @Override
-    public void startConversionToNg() {
-        ResourceTypeConversion.convertAll();
-        CcmApplicationConversion.convertAll();
-        DomainConversion.convertAll();
-    }
-
     /**
      * Getter for the instance of the singleton.
      *
@@ -60,4 +48,16 @@ public class LdnTermsConverter extends AbstractConverter {
     public static LdnTermsConverter getInstance() {
         return instance;
     }
+
+    /**
+     * Method, to start all the different converter classes in a specific
+     * order, so that dependencies can only be set, where the objects have
+     * already been created.
+     */
+    @Override
+    public void startConversion() {
+        ResourceTypeConversion.getInstance().convertAll();
+        CcmApplicationConversion.getInstance().convertAll();
+        DomainConversion.getInstance().convertAll();
+    }
 }

ccm-ldn-terms/src/com/arsdigita/london/terms/portation/conversion/core/categorization/DomainConversion.java

@@ -26,6 +26,7 @@ import com.arsdigita.london.terms.portation.modules.core.categorization.Domain;
 import com.arsdigita.london.terms.portation.modules.core.categorization.DomainOwnership;
 import com.arsdigita.london.terms.portation.modules.core.web.CcmApplication;
 import com.arsdigita.persistence.DataObject;
+import com.arsdigita.portation.AbstractConversion;
 import com.arsdigita.portation.modules.core.categorization.Category;
 import com.arsdigita.web.Application;
 
@@ -39,7 +40,12 @@ import java.util.List;
  * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers<\a>
  * @version created the 7/27/17
  */
-public class DomainConversion {
+public class DomainConversion extends AbstractConversion {
+    private static DomainConversion instance;
+
+    static {
+        instance = new DomainConversion();
+    }
 
     /**
      * Retrieves all trunk-{@link com.arsdigita.london.terms.Domain}s from
@@ -47,15 +53,16 @@ public class DomainConversion {
      * creating the equivalent ng-{@link Domain}s focusing on keeping all the
      * associations in tact.
      */
-    public static void convertAll() {
+    @Override
-        System.err.printf("\tFetching domains from database...");
+    public void convertAll() {
+        System.out.print("\tFetching domains from database...");
         List<com.arsdigita.london.terms.Domain> trunkDomains = com
                 .arsdigita.london.terms.Domain.getAllObjectDomains();
-        System.err.println("done.");
+        System.out.println("done.");
 
-        System.err.printf("\tConverting domains and domain ownerships...\n");
+        System.out.print("\tConverting domains and domain ownerships...\n");
         createDomainsAndSetAssociations(trunkDomains);
-        System.err.println("\tdone.\n");
+        System.out.println("\tdone.\n");
     }
 
     /**
@@ -65,7 +72,7 @@ public class DomainConversion {
      * @param trunkDomains List of all {@link com.arsdigita.london.terms.Domain}s
      *                     from this old trunk-system.
      */
-    private static void createDomainsAndSetAssociations(
+    private void createDomainsAndSetAssociations(
             List<com.arsdigita.london.terms.Domain> trunkDomains) {
         int processedDomains = 0, processedDomainOwnerships = 0;
 
@@ -91,7 +98,7 @@ public class DomainConversion {
 
             processedDomains++;
         }
-        System.err.printf("\t\tCreated %d domains and\n" +
+        System.out.printf("\t\tCreated %d domains and\n" +
                           "\t\tcreated %d domain ownerships.\n",
                           processedDomains, processedDomainOwnerships);
     }
@@ -107,7 +114,7 @@ public class DomainConversion {
      *
      * @return Number of how many {@link DomainOwnership}s have been processed.
      */
-    private static long createDomainOwnerships(Domain domain,
+    private long createDomainOwnerships(Domain domain,
                                                DomainCollection useContexts) {
         int processed = 0;
 
@@ -142,5 +149,12 @@ public class DomainConversion {
         return processed;
     }
 
-
+    /**
+     * Getter for the instance of the singleton.
+     *
+     * @return instance of this singleton
+     */
+    public static DomainConversion getInstance() {
+        return instance;
+    }
 }

ccm-ldn-terms/src/com/arsdigita/london/terms/portation/conversion/core/core/ResourceTypeConversion.java

@@ -19,6 +19,7 @@
 package com.arsdigita.london.terms.portation.conversion.core.core;
 
 import com.arsdigita.london.terms.portation.modules.core.core.ResourceType;
+import com.arsdigita.portation.AbstractConversion;
 
 import java.util.List;
 
@@ -30,20 +31,27 @@ import java.util.List;
  * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers<\a>
  * @version created the 8/2/17
  */
-public class ResourceTypeConversion {
+public class ResourceTypeConversion extends AbstractConversion {
+    private static ResourceTypeConversion instance;
+
+    static {
+        instance = new ResourceTypeConversion();
+    }
+
     /**
      * Retrieves all trunk-{@link com.arsdigita.kernel.ResourceType}s from
      * the persistent storage and collects them in a list. Then calls for
      * creating the equivalent ng-{@link ResourceType}s focusing on keeping all
      * the associations in tact.
      */
-    public static void convertAll() {
+    @Override
-        System.err.printf("\tFetching resource types from database...");
+    public void convertAll() {
+        System.out.print("\tFetching resource types from database...");
         List<com.arsdigita.kernel.ResourceType> trunkResourceTypes = com
                 .arsdigita.kernel.ResourceType.getAllObjectResourceTypes();
-        System.err.println("done.");
+        System.out.println("done.");
 
-        System.err.printf("\tConverting domains...\n");
+        System.out.print("\tConverting domains...\n");
         // create resource types
         int processed = 0;
         for (com.arsdigita.kernel.ResourceType trunkResourceType :
@@ -52,6 +60,15 @@ public class ResourceTypeConversion {
             processed++;
         }
         System.out.printf("\t\tCreated %d resource types.\n", processed);
-        System.err.println("\tdone.\n");
+        System.out.println("\tdone.\n");
+    }
+
+    /**
+     * Getter for the instance of the singleton.
+     *
+     * @return instance of this singleton
+     */
+    public static ResourceTypeConversion getInstance() {
+        return instance;
     }
 }

ccm-ldn-terms/src/com/arsdigita/london/terms/portation/conversion/core/web/CcmApplicationConversion.java

@@ -23,6 +23,7 @@ import com.arsdigita.london.terms.portation.conversion.NgCoreCollection;
 import com.arsdigita.london.terms.portation.modules.core.core.Resource;
 import com.arsdigita.london.terms.portation.modules.core.core.ResourceType;
 import com.arsdigita.london.terms.portation.modules.core.web.CcmApplication;
+import com.arsdigita.portation.AbstractConversion;
 import com.arsdigita.web.Application;
 
 import java.util.ArrayList;
@@ -36,28 +37,35 @@ import java.util.List;
  * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers<\a>
  * @version created the 8/2/17
  */
-public class CcmApplicationConversion {
+public class CcmApplicationConversion extends AbstractConversion {
+    private static CcmApplicationConversion instance;
+
+    static {
+        instance = new CcmApplicationConversion();
+    }
+
     /**
      * Retrieves all trunk-{@link com.arsdigita.kernel.ResourceType}s from
      * the persistent storage and collects them in a list. Then calls for
      * creating the equivalent ng-{@link ResourceType}s focusing on keeping all
      * the associations in tact.
      */
-    public static void convertAll() {
+    @Override
-        System.err.printf("\tFetching ccm applications from database...");
+    public void convertAll() {
+        System.out.print("\tFetching ccm applications from database...");
         List<Application> trunkApplications = Application
                 .getAllApplicationObjects();
-        System.err.println("done.");
+        System.out.println("done.");
 
-        System.err.printf("\tConverting ccm applications...\n");
+        System.out.print("\tConverting ccm applications...\n");
         // create ccm applications
         createCcmApplicationsAndSetAssociations(trunkApplications);
         setRingAssociations(trunkApplications);
 
-        System.err.printf("\tSorting ccm applications...\n");
+        System.out.print("\tSorting ccm applications...\n");
         sortCcmApplications();
 
-        System.err.println("\tdone.\n");
+        System.out.println("\tdone.\n");
     }
 
     /**
@@ -67,7 +75,7 @@ public class CcmApplicationConversion {
      * @param trunkApplications List of all {@link Application}s
      *                          from this old trunk-system.
      */
-    private static void createCcmApplicationsAndSetAssociations(
+    private void createCcmApplicationsAndSetAssociations(
             List<Application> trunkApplications) {
         int processed = 0;
 
@@ -86,11 +94,9 @@ public class CcmApplicationConversion {
                 ccmApplication.setResourceType(resourceType);
             }
 
-            //System.err.println(String.format(
-            //        "ccm application id: %d", ccmApplication.getObjectId()));
             processed++;
         }
-        System.err.printf("\t\tCreated %d ccm applications.\n", processed);
+        System.out.printf("\t\tCreated %d ccm applications.\n", processed);
     }
 
     /**
@@ -101,14 +107,14 @@ public class CcmApplicationConversion {
      * @param trunkApplications List of all {@link Application} from the old
      *                          trunk-system.
      */
-    private static void setRingAssociations(List<Application> trunkApplications) {
+    private void setRingAssociations(List<Application> trunkApplications) {
         for (Application trunkApplication : trunkApplications) {
             CcmApplication ccmApplication = NgCoreCollection
                     .ccmApplications
                     .get(trunkApplication.getID().longValue());
 
             // set parent Resource and opposed association
-            CcmApplication parentResource = null;
+            CcmApplication parentResource;
 
             Application trunkParent = trunkApplication
                     .getParentApplication();
@@ -130,7 +136,7 @@ public class CcmApplicationConversion {
      * Runs once over the unsorted list and iterates over each their parents
      * to add them to the sorted list.
      */
-    private static void sortCcmApplications() {
+    private void sortCcmApplications() {
         ArrayList<CcmApplication> sortedList = new ArrayList<>();
 
         int runs = 0;
@@ -145,7 +151,7 @@ public class CcmApplicationConversion {
         }
         NgCoreCollection.sortedCcmApplications = sortedList;
 
-        System.err.printf("\t\tSorted ccm applications in %d runs.\n", runs);
+        System.out.printf("\t\tSorted ccm applications in %d runs.\n", runs);
     }
 
     /**
@@ -155,7 +161,7 @@ public class CcmApplicationConversion {
      * @param sortedList List of already sorted assignable tasks
      * @param ccmApplication Current assignable task
      */
-    private static void addResourceParent(ArrayList<CcmApplication> sortedList,
+    private void addResourceParent(ArrayList<CcmApplication> sortedList,
                                           CcmApplication ccmApplication) {
         CcmApplication resourceParent = (CcmApplication) ccmApplication
                 .getParent();
@@ -167,4 +173,13 @@ public class CcmApplicationConversion {
                 sortedList.add(resourceParent);
         }
     }
+
+    /**
+     * Getter for the instance of the singleton.
+     *
+     * @return instance of this singleton
+     */
+    public static CcmApplicationConversion getInstance() {
+        return instance;
+    }
 }

ccm-ldn-terms/src/com/arsdigita/london/terms/portation/modules/LdnTermsExporter.java

@@ -25,6 +25,7 @@ import com.arsdigita.london.terms.portation.modules.core.categorization.DomainMa
 import com.arsdigita.london.terms.portation.modules.core.web.CcmApplicationMarshaller;
 import com.arsdigita.portation.AbstractExporter;
 import com.arsdigita.portation.Format;
+import com.arsdigita.portation.modules.CoreExporter;
 
 import java.util.ArrayList;
 
@@ -40,53 +41,30 @@ import java.util.ArrayList;
  */
 public class LdnTermsExporter extends AbstractExporter {
 
-    public static void startExport() {
+    private static LdnTermsExporter instance;
-        exportResourceTypes();
+
-        exportCcmApplications();
+    static {
-        exportDomains();
+        instance = new LdnTermsExporter();
-        exportDomainOwnerships();
     }
 
-    private static void exportResourceTypes() {
+    /**
-        System.out.printf("\tExporting resource types...");
+     * Getter for the instance of the singleton.
-        ResourceTypeMarshaller resourceTypeMarshaller = new
+     *
-                ResourceTypeMarshaller();
+     * @return instance of this singleton
-        resourceTypeMarshaller.prepare(
+     */
-                Format.XML, pathName, "resourceTypes", indentation);
+    public static LdnTermsExporter getInstance() {
-        resourceTypeMarshaller.exportList(
+        return instance;
-                new ArrayList<>(NgCoreCollection.resourceTypes.values()));
-        System.out.printf("\tdone.\n");
     }
 
-    private static void exportCcmApplications() {
+    @Override
-        System.out.printf("\tExporting ccm applications...");
+    public void startMarshaller() {
-        CcmApplicationMarshaller ccmApplicationMarshaller = new
+        ResourceTypeMarshaller.getInstance().
-                CcmApplicationMarshaller();
+                marshallAll(format, pathName, indentation);
-        ccmApplicationMarshaller.prepare(
+        CcmApplicationMarshaller.getInstance().
-                Format.XML, pathName, "ccmApplications", indentation);
+                marshallAll(format, pathName, indentation);
-        ccmApplicationMarshaller.exportList(
+        DomainMarshaller.getInstance().
-                NgCoreCollection.sortedCcmApplications);
+                marshallAll(format, pathName, indentation);
-        System.out.printf("\tdone.\n");
+        DomainOwnershipMarshaller.getInstance().
-    }
+                marshallAll(format, pathName, indentation);
-
-    private static void exportDomains() {
-        System.out.printf("\tExporting domains...");
-        DomainMarshaller domainMarshaller = new DomainMarshaller();
-        domainMarshaller.prepare(
-                Format.XML, pathName, "domains", indentation);
-        domainMarshaller.exportList(
-                new ArrayList<>(NgCoreCollection.domains.values()));
-        System.out.printf("\t\tdone.\n");
-    }
-
-    private static void exportDomainOwnerships() {
-        System.out.printf("\tExporting domain ownerships...");
-        DomainOwnershipMarshaller domainOwnershipMarshaller = new
-                DomainOwnershipMarshaller();
-        domainOwnershipMarshaller.prepare(
-                Format.XML, pathName, "domainOwnerships", indentation);
-        domainOwnershipMarshaller.exportList(
-                new ArrayList<>(NgCoreCollection.domainOwnerships.values()));
-        System.out.printf("\tdone.\n");
     }
 }

ccm-ldn-terms/src/com/arsdigita/london/terms/portation/modules/core/categorization/DomainMarshaller.java

@@ -18,11 +18,50 @@
  */
 package com.arsdigita.london.terms.portation.modules.core.categorization;
 
+import com.arsdigita.london.terms.portation.conversion.NgCoreCollection;
 import com.arsdigita.portation.AbstractMarshaller;
+import com.arsdigita.portation.Format;
+
+import java.util.ArrayList;
 
 /**
  * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers<\a>
  * @version created the 7/27/17
  */
 public class DomainMarshaller extends AbstractMarshaller<Domain> {
+    private static  DomainMarshaller instance;
+
+    static {
+        instance = new DomainMarshaller();
+    }
+
+    /**
+     * Getter for the instance of this singleton.
+     *
+     * @return instance of the singleton
+     */
+    public static DomainMarshaller getInstance() {
+        return instance;
+    }
+
+    /**
+     * Passes the parameters for the file to which the {@link Domain}-objects
+     * will be exported to down to its corresponding
+     * {@link AbstractMarshaller<Domain>} and then requests this
+     * {@link AbstractMarshaller<Domain>} to start the export of all its
+     * {@link Domain}s.
+     *
+     * @param format The format of the file to which will be exported to
+     * @param pathName The name for the file
+     * @param indentation Whether to use indentation in the file
+     */
+    @Override
+    public void marshallAll(final Format format,
+                            final String pathName,
+                            final boolean indentation) {
+        System.out.print("\tExporting domains...");
+        prepare(format, pathName, "domains", indentation);
+        exportList(new ArrayList<>(NgCoreCollection.domains.values()));
+        System.out.print("\t\tdone.\n");
+    }
 }

ccm-ldn-terms/src/com/arsdigita/london/terms/portation/modules/core/categorization/DomainOwnershipMarshaller.java

@@ -18,11 +18,50 @@
  */
 package com.arsdigita.london.terms.portation.modules.core.categorization;
 
+import com.arsdigita.london.terms.portation.conversion.NgCoreCollection;
 import com.arsdigita.portation.AbstractMarshaller;
+import com.arsdigita.portation.Format;
+
+import java.util.ArrayList;
 
 /**
  * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers<\a>
  * @version created the 8/10/17
  */
 public class DomainOwnershipMarshaller extends AbstractMarshaller<DomainOwnership>{
+    private static DomainOwnershipMarshaller instance;
+
+    static {
+        instance = new DomainOwnershipMarshaller();
+    }
+
+    /**
+     * Getter for the instance of this singleton.
+     *
+     * @return instance of the singleton
+     */
+    public static DomainOwnershipMarshaller getInstance() {
+        return instance;
+    }
+
+    /**
+     * Passes the parameters for the file to which the {@link DomainOwnership}-
+     * objects will be exported to down to its corresponding
+     * {@link AbstractMarshaller<DomainOwnership>} and then requests this
+     * {@link AbstractMarshaller<DomainOwnership>} to start the export of all
+     * its {@link DomainOwnership}s.
+     *
+     * @param format The format of the file to which will be exported to
+     * @param pathName The name for the file
+     * @param indentation Whether to use indentation in the file
+     */
+    @Override
+    public void marshallAll(final Format format,
+                            final String pathName,
+                            final boolean indentation) {
+        System.out.print("\tExporting domainOwnerships...");
+        prepare(format, pathName, "domainOwnerships", indentation);
+        exportList(new ArrayList<>(NgCoreCollection.domainOwnerships.values()));
+        System.out.print("\tdone.\n");
+    }
 }

ccm-ldn-terms/src/com/arsdigita/london/terms/portation/modules/core/core/ResourceType.java

@@ -29,7 +29,7 @@ import java.util.Locale;
 /**
  * This class is a port of the old {@code ResourceType} entity.
  *
- * @deprecated The real purpose of this class is not clear. Also the
+ * /@deprecated The real purpose of this class is not clear. Also the
  * informations provided by the entities of this class are all quite static or
  * can be interfered from the classes itself. In modern Java most if not all the
  * informations provided by the entities of this class would be expressed as

ccm-ldn-terms/src/com/arsdigita/london/terms/portation/modules/core/core/ResourceTypeMarshaller.java

@@ -18,12 +18,50 @@
  */
 package com.arsdigita.london.terms.portation.modules.core.core;
 
-import com.arsdigita.london.terms.portation.modules.core.core.ResourceType;
+import com.arsdigita.london.terms.portation.conversion.NgCoreCollection;
 import com.arsdigita.portation.AbstractMarshaller;
+import com.arsdigita.portation.Format;
+
+import java.util.ArrayList;
 
 /**
  * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers<\a>
  * @version created the 8/3/17
  */
 public class ResourceTypeMarshaller extends AbstractMarshaller<ResourceType> {
+    private static ResourceTypeMarshaller instance;
+
+    static {
+        instance = new ResourceTypeMarshaller();
+    }
+
+    /**
+     * Getter for the instance of this singleton.
+     *
+     * @return instance of the singleton
+     */
+    public static ResourceTypeMarshaller getInstance() {
+        return instance;
+    }
+
+    /**
+     * Passes the parameters for the file to which the {@link ResourceType}-
+     * objects will be exported to down to its corresponding
+     * {@link AbstractMarshaller<ResourceType>} and then requests this
+     * {@link AbstractMarshaller<ResourceType>} to start the export of all
+     * its {@link ResourceType}s.
+     *
+     * @param format The format of the file to which will be exported to
+     * @param pathName The name for the file
+     * @param indentation Whether to use indentation in the file
+     */
+    @Override
+    public void marshallAll(final Format format,
+                            final String pathName,
+                            final boolean indentation) {
+        System.out.print("\tExporting resourceTypes...");
+        prepare(format, pathName, "resourceTypes", indentation);
+        exportList(new ArrayList<>(NgCoreCollection.resourceTypes.values()));
+        System.out.print("\tdone.\n");
+    }
 }

ccm-ldn-terms/src/com/arsdigita/london/terms/portation/modules/core/web/CcmApplicationMarshaller.java

@@ -18,11 +18,48 @@
  */
 package com.arsdigita.london.terms.portation.modules.core.web;
 
+import com.arsdigita.london.terms.portation.conversion.NgCoreCollection;
 import com.arsdigita.portation.AbstractMarshaller;
+import com.arsdigita.portation.Format;
 
 /**
  * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers<\a>
  * @version created the 8/3/17
  */
 public class CcmApplicationMarshaller extends AbstractMarshaller<CcmApplication> {
+    private static CcmApplicationMarshaller instance;
+
+    static {
+        instance = new CcmApplicationMarshaller();
+    }
+
+    /**
+     * Getter for the instance of this singleton.
+     *
+     * @return instance of the singleton
+     */
+    public static CcmApplicationMarshaller getInstance() {
+        return instance;
+    }
+
+    /**
+     * Passes the parameters for the file to which the {@link CcmApplication}-
+     * objects will be exported to down to its corresponding
+     * {@link AbstractMarshaller<CcmApplication>} and then requests this
+     * {@link AbstractMarshaller<CcmApplication>} to start the export of all
+     * its {@link CcmApplication}s.
+     *
+     * @param format The format of the file to which will be exported to
+     * @param pathName The name for the file
+     * @param indentation Whether to use indentation in the file
+     */
+    @Override
+    public void marshallAll(final Format format,
+                            final String pathName,
+                            final boolean indentation) {
+        System.out.print("\tExporting ccmApplications...");
+        prepare(format, pathName, "ccmApplications", indentation);
+        exportList(NgCoreCollection.sortedCcmApplications);
+        System.out.print("\tdone.\n");
+    }
 }