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Central Marhsaller implementation for the exportation is donesvn update 

git-svn-id: https://svn.libreccm.org/ccm/ccm_ng@3913 8810af33-2d31-482b-a856-94f89814c4df
pull/2/head
tosmers 2016-03-09 13:05:28 +00:00
parent 8b941d3e70
commit dbd7af3c4d
4 changed files with 97 additions and 160 deletions
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81
ccm-core/src/main/java/org/libreccm/portation/AbstractMarshaller.java
View File

@ -18,13 +18,10 @@
*/
package org.libreccm.portation;
import com.fasterxml.jackson.dataformat.csv.CsvMapper;
import com.fasterxml.jackson.dataformat.csv.CsvSchema;
import org.apache.log4j.Logger;
import org.libreccm.core.Identifiable;
import java.io.File;
import java.io.IOException;
import java.util.List;
/**
@ -37,33 +34,30 @@ import java.util.List;
* @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers</a>
* @version created the 2/10/16
*/
public abstract class AbstractMarshaller<T extends Identifiable> {
public abstract class AbstractMarshaller<I extends Identifiable> {
private static final Logger log = Logger.getLogger(AbstractMarshaller.class);
private Format format;
private File exportFile;
private List<File> importFiles;
private Format format;
// CSV specifics
private CsvMapper mapper;
private CsvSchema schema;
// JSON specifics
// XML specifics
/**
*
* @param format
*/
private void init(final Format format) {
this.format = format;
switch (this.format) {
case CSV:
mapper = new CsvMapper();
schema = getCsvSchema();
schema = mapper.schemaFor(getClassT());
break;
case JSON:
@ -88,30 +82,13 @@ public abstract class AbstractMarshaller<T extends Identifiable> {
}
/* CSV Export/Import */
/**
* Main export method. Exports a list of same typed objects to CSV
* strings and writes them into the same file with a name specific to
* their class.
*
* TODO: throw exception for ui
* TODO: error message not with uuid
*
* @param exportObjects List of {@code T}-tpyed objects being exported
*/
public void exportEntities(final List<T> exportObjects) {
public void exportEntities(final List<I> exportObjects) {
switch (format) {
case CSV:
exportObjects.forEach(t -> {
try {
mapper.writer(schema).writeValue(exportFile, t);
} catch (IOException e) {
log.error(String.format("Error writing object with UUID " +
"%d to CSV-file with the name %s.",
1234, exportFile.getName()));
}
});
break;
case JSON:
@ -127,27 +104,12 @@ public abstract class AbstractMarshaller<T extends Identifiable> {
}
/**
* Main import method. Imports a list of string representing object of
* the same type ({@code T}) from a CSV-file and parses them into the
* corresponding objects.
*
* TODO: throw exception for ui
* TODO: error message not with uuid
*
* @return List of {@code T}-typed objects being imported
*/
public List<T> importEntities() {
public List<I> importEntities() {
switch (format) {
case CSV:
/*List<T> importObjects = new ArrayList<>();
try {
mapper.readerFor(getClassT()).with(schema).readValues(file)
.forEachRemaining(t -> importObjects.add((T) t));
} catch (IOException e) {
log.error(String.format("Error reading object with UUID %d from " +
"CSV-file with the name %s.", 1234, file.getName()));
}
return importObjects;*/
break;
case JSON:
@ -162,29 +124,4 @@ public abstract class AbstractMarshaller<T extends Identifiable> {
return null;
}
/**
* Abstract method to get the class of the extending subclass fulfilling
* the generic type {@code T}.
*
* @return Class of the extending subclass.
*/
protected abstract Class getClassT();
/**
* Abstract method to get the CSV schema needed for both ex- and
* importation specific to every extending subclass.
*
* @return The CSV schema specific to the implementing subclass
*/
protected abstract CsvSchema getCsvSchema();
/* JSON Export/Import */
/* XML Export/Import */
}

124
ccm-core/src/main/java/org/libreccm/portation/Marshaller.java
View File

@ -27,12 +27,15 @@ import javax.faces.bean.RequestScoped;
import javax.inject.Inject;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Queue;
import java.util.stream.Collectors;
import java.util.Map;
/**
* Central class for exporting and importing objects of this system stored in
* the database. Retrieves all available implementations of
* {@link AbstractMarshaller} using CDI. The implementations have to be CDI
* beans of course. Also they must be annotated with the {@link Marshals}
* annotation.
*
* @author <a href="mailto:tosmers@uni-bremen.de">Tobias Osmers</a>
* @version created the 03.02.2016
@ -45,72 +48,95 @@ public class Marshaller {
private Instance<AbstractMarshaller<? extends Identifiable>>
marshallerInstances;
// Assigns lists with objects of the same type as values to their typ as
// key.
private Map<Class<? extends Identifiable>, List<Identifiable>> classListMap;
/**
* Main export method. Organizes the objects into list of the same type
* and calls a second export method for each list.
*
* @param objects
* @param format
* @param filename
* @param objects All objects to be exported
* @param format The export style/format e.g. CSV or JSON
* @param filename The name of the file to be exported to
*/
@SuppressWarnings("unchecked")
public void exportObjects(List<? extends
Identifiable> objects, Format format, String filename) {
public void exportObjects(List<Identifiable> objects, Format format,
String filename) {
putObjects(objects);
List<List<? extends Identifiable>> objectsByClass = new ArrayList<>();
Queue<Class<? extends Identifiable>> queue = new LinkedList<>();
// Splits list of all entities into lists of the same entity class
while (!objects.isEmpty()) {
Class<? extends Identifiable> clazz = objects.get(0).getClass();
objectsByClass.add(objects.stream()
.filter(t -> t.getClass() == clazz)
.collect(Collectors.toList()));
queue.add(clazz);
for (Map.Entry<Class<? extends Identifiable>, List<Identifiable>>
classListEntry : classListMap.entrySet()) {
exportList( classListEntry.getValue(), classListEntry.getKey(),
format, filename);
}
}
// Exports list of the same class
for (List objectList : objectsByClass) {
/**
* Organizes a list of different {@link Identifiable} objects into a map
* assigning lists of the same type to their type as values to a key. The
* type which all objects of that list have in common is their key.
* That opens the possibility of being certain of the objects types in
* the list. Guarantied through this implementation.
*
* @param objects list of all objects being organized
*/
private void putObjects(List<Identifiable> objects) {
for (Identifiable object : objects) {
Class<? extends Identifiable> type = object.getClass();
if (classListMap.containsKey(type)) {
classListMap.get(type).add(object);
} else {
List<Identifiable> values = new ArrayList<>();
values.add(object);
classListMap.put(type, values);
}
}
}
/**
* Selects the right marshaller for the given type, initializes that
* marshaller for the given export wishes and calls the export method of
* that marshaller upon the given list of same typed objects.
*
* @param list List of objects to be exported of the same type
* @param type The class of the type
* @param format The export style
* @param filename The filename
* @param <I> The type
*/
private <I extends Identifiable> void exportList(List<I> list, Class<?
extends I> type, Format format, String filename) {
final Instance<AbstractMarshaller<? extends Identifiable>>
marshallerInstance = marshallerInstances.select(new
MarshalsLiteral(queue.peek()));
MarshalsLiteral(type));
if (marshallerInstance.isUnsatisfied()) {
// If there are no marshals we have a problem...
throw new IllegalArgumentException(String.format("No " +
"marshaller for \"%s\" found.", queue.peek()
.getName()));
//If there are no marshallers we have a problem...
throw new IllegalArgumentException(String.format(
"No marshallers for \"%s\" found.", type.getName()));
} else if (marshallerInstance.isAmbiguous()) {
// If there is more than one marshaller something is wrong...
throw new IllegalArgumentException(String.format("More than " +
"one marshaller for \"%s\" found.", queue.peek()
//If there is more than one marshaller something is wrong...
throw new IllegalArgumentException(String.format(
"More than one marshaller for \"%s\" found.", type
.getName()));
} else {
// Gets the marshaller and calls the export method
final Iterator<AbstractMarshaller<? extends Identifiable>> it =
marshallerInstance.iterator();
// Get the marshaller for this list and call the export method.
final Iterator<AbstractMarshaller<? extends Identifiable>>
iterator = marshallerInstance.iterator();
@SuppressWarnings("unchecked")
final AbstractMarshaller<I> marshaller = (AbstractMarshaller<I>)
iterator.next();
AbstractMarshaller<? extends Identifiable> marshaller = it
.next();
marshaller.init(format, filename);
marshaller.exportEntities(objectList);
}
queue.remove();
marshaller.exportEntities(list);
}
}
private <T extends Identifiable> List<T> getListForClass(List<? extends
Identifiable> objList, Class<T> objClass) {
return null;
//objList.stream().filter(obj -> obj.getClass() == objClass)
// .collect(Collectors.toList());
}
/**
*
* {@link AnnotationLiteral} used for filtering the available marshallers.
*/
private class MarshalsLiteral extends AnnotationLiteral<Marshals>
implements Marshals {

4
ccm-core/src/main/java/org/libreccm/portation/Marshals.java
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@ -27,7 +27,9 @@ import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
/**
*
* Qualifier annotation for implementations of {@link AbstractMarshaller}. The
* value is the implementation of {@link Identifiable} for which the annotated
* {@link AbstractMarshaller} implementation exports and imports its instances.
*
* @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers</a>
* @version created the 2/24/16

28
ccm-docrepo/src/main/java/org/libreccm/docrepo/AbstractResourceMarshaller.java
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@ -18,7 +18,6 @@
*/
package org.libreccm.docrepo;
import com.fasterxml.jackson.dataformat.csv.CsvSchema;
import org.libreccm.portation.AbstractMarshaller;
import org.libreccm.portation.Marshals;
@ -29,31 +28,4 @@ import org.libreccm.portation.Marshals;
@Marshals(AbstractResource.class)
public class AbstractResourceMarshaller extends AbstractMarshaller<AbstractResource> {
@Override
protected Class getClassT() {
return AbstractResource.class;
}
@Override
protected CsvSchema getCsvSchema() {
return CsvSchema.builder()
.addColumn("object_ID", CsvSchema.ColumnType.NUMBER)
.addColumn("displayName")
.addColumn("permissions", CsvSchema.ColumnType.ARRAY)
.addColumn("categories", CsvSchema.ColumnType.ARRAY)
.addColumn("name")
.addColumn("description")
.addColumn("path")
.addColumn("mimeType")
.addColumn("size", CsvSchema.ColumnType.NUMBER)
.addColumn("creationDate", CsvSchema.ColumnType.NUMBER)
.addColumn("lastModifiedDate", CsvSchema.ColumnType.NUMBER)
.addColumn("creationIp")
.addColumn("lastModifiedIp")
.addColumn("creationUser")
.addColumn("lastModifiedUser")
.addColumn("parent")
.addColumn("repository")
.build();
}
}