CCM NG: ThemeProcessor for XSLT based themes

git-svn-id: https://svn.libreccm.org/ccm/ccm_ng@5081 8810af33-2d31-482b-a856-94f89814c4df

Former-commit-id: 66c1c8baeb

ccm-core/src/main/java/org/libreccm/theming/StaticThemeProvider.java

@@ -62,6 +62,7 @@ public class StaticThemeProvider implements ThemeProvider {
      * Path the the static themes.
      */
     private static final String THEMES_DIR = "/themes";
+    private static final long serialVersionUID = -8701021965452233811L;
 
     @Inject
     private ThemeFileInfoUtil themeFileInfoUtil;

ccm-core/src/main/java/org/libreccm/theming/ThemeConstants.java

@@ -24,6 +24,8 @@ package org.libreccm.theming;
  */
 public final class ThemeConstants {
 
+    public static final String PAGE_PARAMETER_TEMPLATE  = "template";
+
     public final static String THEME_MANIFEST_JSON = "theme.json";
     public final static String THEME_MANIFEST_XML = "theme.xml";
 

ccm-core/src/main/java/org/libreccm/theming/ThemeFileInfo.java

@@ -18,6 +18,7 @@
  */
 package org.libreccm.theming;
 
+import java.io.Serializable;
 import java.util.Objects;
 
 /**
@@ -25,7 +26,9 @@ import java.util.Objects;
  *
  * @author <a href="mailto:jens.pelzetter@googlemail.com">Jens Pelzetter</a>
  */
-public class ThemeFileInfo {
+public class ThemeFileInfo implements Serializable {
+
+    private static final long serialVersionUID = 2880986115955856570L;
 
     /**
      * The name of the file.

ccm-core/src/main/java/org/libreccm/theming/ThemeFileInfoUtil.java

@@ -21,6 +21,7 @@ package org.libreccm.theming;
 import org.libreccm.core.UnexpectedErrorException;
 
 import java.io.IOException;
+import java.io.Serializable;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.Objects;
@@ -33,7 +34,9 @@ import javax.enterprise.context.RequestScoped;
  * @author <a href="mailto:jens.pelzetter@googlemail.com">Jens Pelzetter</a>
  */
 @RequestScoped
-public class ThemeFileInfoUtil {
+public class ThemeFileInfoUtil implements Serializable {
+
+    private static final long serialVersionUID = -3382896567742774318L;
 
     /**
      * Build a {@link ThemeFileInfo} object for a file. Before calling this

ccm-core/src/main/java/org/libreccm/theming/ThemeInfo.java

@@ -20,6 +20,7 @@ package org.libreccm.theming;
 
 import org.libreccm.theming.manifest.ThemeManifest;
 
+import java.io.Serializable;
 import java.util.Objects;
 
 /**
@@ -27,7 +28,9 @@ import java.util.Objects;
  *
  * @author <a href="mailto:jens.pelzetter@googlemail.com">Jens Pelzetter</a>
  */
-public class ThemeInfo {
+public class ThemeInfo implements Serializable {
+
+    private static final long serialVersionUID = -518244930947022256L;
 
     /**
      * The manifest of the theme.

ccm-core/src/main/java/org/libreccm/theming/ThemeProcessor.java

@@ -18,6 +18,7 @@
  */
 package org.libreccm.theming;
 
+import java.io.Serializable;
 import java.util.Map;
 
 import javax.enterprise.context.RequestScoped;
@@ -32,7 +33,7 @@ import javax.enterprise.context.RequestScoped;
  *
  * @author <a href="mailto:jens.pelzetter@googlemail.com">Jens Pelzetter</a>
  */
-public interface ThemeProcessor {
+public interface ThemeProcessor extends Serializable {
 
     /**
      * Process the provided {@link PageModel} {@code page} and convert into HTML
@@ -41,7 +42,8 @@ public interface ThemeProcessor {
      *
      * @param page          The page to convert the HTML.
      * @param theme         The theme to use.
-     * @param themeProvider The {@link ThemeProvider} which provides the the theme.
+     * @param themeProvider The {@link ThemeProvider} which provides the the
+     *                      theme.
      *
      * @return The HTML for the provided {@code page}.
      */

ccm-core/src/main/java/org/libreccm/theming/ThemeProvider.java

@@ -21,6 +21,7 @@ package org.libreccm.theming;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.io.OutputStream;
+import java.io.Serializable;
 import java.util.List;
 import java.util.Optional;
 
@@ -30,7 +31,7 @@ import java.util.Optional;
  *
  * @author <a href="mailto:jens.pelzetter@googlemail.com">Jens Pelzetter</a>
  */
-public interface ThemeProvider {
+public interface ThemeProvider extends Serializable {
 
     /**
      * Provides a list of all themes provided by this theme provider. The list

ccm-core/src/main/java/org/libreccm/theming/Themes.java

@@ -23,6 +23,7 @@ import org.apache.logging.log4j.Logger;
 import org.libreccm.core.UnexpectedErrorException;
 import org.libreccm.pagemodel.PageModel;
 
+import java.io.Serializable;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
@@ -40,7 +41,9 @@ import javax.inject.Inject;
  * @author <a href="mailto:jens.pelzetter@googlemail.com">Jens Pelzetter</a>
  */
 @RequestScoped
-public class Themes {
+public class Themes implements Serializable {
+
+    private static final long serialVersionUID = 6861457919635241221L;
 
     private static final Logger LOGGER = LogManager.getLogger(Themes.class);
 
@@ -139,5 +142,4 @@ public class Themes {
         return processor.process(page, theme, provider);
     }
 
-
 }

ccm-core/src/main/java/org/libreccm/theming/manifest/ThemeManifest.java

@@ -33,6 +33,8 @@ import javax.xml.bind.annotation.XmlRootElement;
 
 import static org.libreccm.theming.ThemeConstants.*;
 
+import java.io.Serializable;
+
 /**
  * Each theme contains a Manifest (either in XML or JSON format) which provides
  * informations about the theme.
@@ -41,7 +43,9 @@ import static org.libreccm.theming.ThemeConstants.*;
  */
 @XmlRootElement(name = "theme", namespace = THEMES_XML_NS)
 @XmlAccessorType(XmlAccessType.FIELD)
-public class ThemeManifest {
+public class ThemeManifest implements Serializable {
+
+    private static final long serialVersionUID = 699497658459398231L;
 
     /**
      * The name of the theme. Usually the same as the name of directory which
@@ -75,6 +79,12 @@ public class ThemeManifest {
     @XmlElement(name = "template", namespace = THEMES_XML_NS)
     private List<ThemeTemplate> templates;
 
+    /**
+     * Path of the default template.
+     */
+    @XmlElement(name = "default-template", namespace = THEMES_XML_NS)
+    private String defaultTemplate;
+
     public ThemeManifest() {
         templates = new ArrayList<>();
     }
@@ -92,8 +102,9 @@ public class ThemeManifest {
     }
 
     public void setType(final String type) {
-        this.type  =type;
+        this.type = type;
     }
+
     public LocalizedString getTitle() {
         return title;
     }
@@ -126,6 +137,14 @@ public class ThemeManifest {
         templates.remove(template);
     }
 
+    public String getDefaultTemplate() {
+        return defaultTemplate;
+    }
+
+    public void setDefaultTemplate(final String defaultTemplate) {
+        this.defaultTemplate = defaultTemplate;
+    }
+
     @Override
     public int hashCode() {
         int hash = 7;
@@ -134,6 +153,7 @@ public class ThemeManifest {
         hash = 83 * hash + Objects.hashCode(title);
         hash = 83 * hash + Objects.hashCode(description);
         hash = 83 * hash + Objects.hashCode(templates);
+        hash = 83 * hash + Objects.hashCode(defaultTemplate);
         return hash;
     }
 
@@ -164,7 +184,10 @@ public class ThemeManifest {
         if (!Objects.equals(description, other.getDescription())) {
             return false;
         }
-        return Objects.equals(templates, other.getTemplates());
+        if (!Objects.equals(templates, other.getTemplates())) {
+            return false;
+        }
+        return Objects.equals(defaultTemplate, other.getDefaultTemplate());
     }
 
     public boolean canEqual(final Object obj) {
@@ -182,13 +205,15 @@ public class ThemeManifest {
                                  + "name = \"%s\", "
                                  + "title = \"%s\", "
                                  + "description = \"%s\", "
-                                 + "templates = %s%s"
+                                 + "templates = %s, "
+                                 + "defaultTemplate%s"
                                  + " }",
                              super.toString(),
                              name,
                              Objects.toString(title),
                              Objects.toString(description),
                              Objects.toString(templates),
+                             defaultTemplate,
                              data);
 
     }

ccm-core/src/main/java/org/libreccm/theming/xslt/XsltThemeProcessor.java

@@ -0,0 +1,165 @@
+/*
+ * Copyright (C) 2017 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 org.libreccm.theming.xslt;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.dataformat.xml.JacksonXmlModule;
+import com.fasterxml.jackson.dataformat.xml.XmlMapper;
+import org.libreccm.core.UnexpectedErrorException;
+import org.libreccm.theming.ThemeInfo;
+import org.libreccm.theming.ThemeProcessor;
+import org.libreccm.theming.ThemeProvider;
+import org.w3c.dom.Document;
+import org.xml.sax.SAXException;
+
+import java.io.IOException;
+import java.util.Map;
+
+import javax.enterprise.context.RequestScoped;
+import javax.xml.parsers.DocumentBuilder;
+import javax.xml.parsers.DocumentBuilderFactory;
+import javax.xml.parsers.ParserConfigurationException;
+
+import static org.libreccm.theming.ThemeConstants.*;
+
+import org.libreccm.theming.manifest.ThemeTemplate;
+
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.Reader;
+import java.io.StringWriter;
+import java.io.UnsupportedEncodingException;
+import java.util.Optional;
+
+import javax.xml.transform.Result;
+import javax.xml.transform.Transformer;
+import javax.xml.transform.TransformerConfigurationException;
+import javax.xml.transform.TransformerException;
+import javax.xml.transform.TransformerFactory;
+import javax.xml.transform.dom.DOMSource;
+import javax.xml.transform.stream.StreamResult;
+import javax.xml.transform.stream.StreamSource;
+
+/**
+ * A {@link ThemeProcessor} implementation for XSLT based themes.
+ * 
+ * @author <a href="mailto:jens.pelzetter@googlemail.com">Jens Pelzetter</a>
+ */
+@RequestScoped
+public class XsltThemeProcessor implements ThemeProcessor {
+
+    private static final long serialVersionUID = -3883625727845105417L;
+
+    @Override
+    public String process(final Map<String, Object> page,
+                          final ThemeInfo theme,
+                          final ThemeProvider themeProvider) {
+
+        //Convert page to XML
+        final JacksonXmlModule xmlModule = new JacksonXmlModule();
+        final ObjectMapper mapper = new XmlMapper(xmlModule);
+
+        final String pageAsXml;
+        try {
+            pageAsXml = mapper.writeValueAsString(page);
+        } catch (JsonProcessingException ex) {
+            throw new UnexpectedErrorException(ex);
+        }
+
+        final DocumentBuilderFactory documentBuilderFactory
+                                         = DocumentBuilderFactory.newInstance();
+        final DocumentBuilder documentBuilder;
+        try {
+            documentBuilder = documentBuilderFactory.newDocumentBuilder();
+        } catch (ParserConfigurationException ex) {
+            throw new UnexpectedErrorException(ex);
+        }
+
+        final Document document;
+        try {
+            document = documentBuilder.parse(pageAsXml);
+        } catch (SAXException | IOException ex) {
+            throw new UnexpectedErrorException(ex);
+        }
+
+        final String pathToTemplate;
+        if (page.containsKey(PAGE_PARAMETER_TEMPLATE)) {
+
+            final String templateName = (String) page
+                .get(PAGE_PARAMETER_TEMPLATE);
+
+            final Optional<ThemeTemplate> template = theme
+                .getManifest()
+                .getTemplates()
+                .stream()
+                .filter(current -> current.getName().equals(templateName))
+                .findAny();
+
+            if (template.isPresent()) {
+                pathToTemplate = template.get().getPath();
+            } else {
+                throw new UnexpectedErrorException(String
+                    .format("Theme \"%s\" does provide template \"%s\".",
+                            theme.getName(),
+                            templateName));
+            }
+        } else {
+            pathToTemplate = theme.getManifest().getDefaultTemplate();
+        }
+
+        final InputStream xslFileInputStream = themeProvider
+            .getThemeFileAsStream(theme.getName(),
+                                  theme.getVersion(),
+                                  pathToTemplate)
+            .orElseThrow(() -> new UnexpectedErrorException(String
+            .format("Failed to open XSL file \"%s\" from theme \"%s\" for "
+                        + "reading.",
+                    pathToTemplate,
+                    theme.getName())));
+
+        final Reader reader;
+        try {
+            reader = new InputStreamReader(xslFileInputStream, "UTF-8");
+        } catch (UnsupportedEncodingException ex) {
+            throw new UnexpectedErrorException(ex);
+        }
+
+        final StreamSource xslFileStreamSource = new StreamSource(reader);
+        final TransformerFactory transformerFactory = TransformerFactory
+            .newInstance();
+        final Transformer transformer;
+        try {
+            transformer = transformerFactory.newTransformer(xslFileStreamSource);
+        } catch (TransformerConfigurationException ex) {
+            throw new UnexpectedErrorException(ex);
+        }
+        
+        final StringWriter resultWriter = new StringWriter();
+        final Result result = new StreamResult(resultWriter);
+        try {
+            transformer.transform(new DOMSource(document), result);
+        } catch (TransformerException ex) {
+            throw new UnexpectedErrorException(ex);
+        }
+        
+        return resultWriter.toString();
+    }
+
+}

pom.xml

@@ -115,7 +115,7 @@
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-compiler-plugin</artifactId>
-                    <version>3.6.1</version>
+                    <version>3.7.0</version>
                     <configuration>
                         <source>1.8</source>
                         <target>1.8</target>
@@ -255,7 +255,7 @@
                 <plugin>
                     <groupId>com.vaadin</groupId>
                     <artifactId>vaadin-maven-plugin</artifactId>
-                    <version>8.1.3</version>
+                    <version>8.1.5</version>
                 </plugin>
             </plugins>
         </pluginManagement>
@@ -405,7 +405,7 @@
             <dependency>
                 <groupId>com.vaadin</groupId>
                 <artifactId>vaadin-bom</artifactId>
-                <version>8.1.3</version>
+                <version>8.1.5</version>
                 <scope>import</scope>
                 <type>pom</type>
             </dependency>
@@ -442,7 +442,7 @@
             <dependency>
                 <groupId>org.apache.logging.log4j</groupId>
                 <artifactId>log4j-bom</artifactId>
-                <version>2.8.2</version>
+                <version>2.9.1</version>
                 <type>pom</type>
                 <scope>import</scope>
             </dependency>
@@ -520,7 +520,7 @@
             <dependency>
                 <groupId>net.sf.saxon</groupId>
                 <artifactId>Saxon-HE</artifactId>
-                <version>9.8.0-3</version>
+                <version>9.8.0-5</version>
             </dependency>
 
             <dependency>