Author: mir
Date: Tue Dec 15 17:30:45 2009
New Revision: 890896
URL: http://svn.apache.org/viewvc?rev=890896&view=rev
Log:
CLEREZZA-25: implemented ThumbnailGenerator
Added:
incubator/clerezza/issues/CLEREZZA-25/org.apache.clerezza.platform.content.thumbnails/
incubator/clerezza/issues/CLEREZZA-25/org.apache.clerezza.platform.content.thumbnails/pom.xml
incubator/clerezza/issues/CLEREZZA-25/org.apache.clerezza.platform.content.thumbnails/src/
incubator/clerezza/issues/CLEREZZA-25/org.apache.clerezza.platform.content.thumbnails/src/main/
incubator/clerezza/issues/CLEREZZA-25/org.apache.clerezza.platform.content.thumbnails/src/main/java/
incubator/clerezza/issues/CLEREZZA-25/org.apache.clerezza.platform.content.thumbnails/src/main/java/org/
incubator/clerezza/issues/CLEREZZA-25/org.apache.clerezza.platform.content.thumbnails/src/main/java/org/apache/
incubator/clerezza/issues/CLEREZZA-25/org.apache.clerezza.platform.content.thumbnails/src/main/java/org/apache/clerezza/
incubator/clerezza/issues/CLEREZZA-25/org.apache.clerezza.platform.content.thumbnails/src/main/java/org/apache/clerezza/platform/
incubator/clerezza/issues/CLEREZZA-25/org.apache.clerezza.platform.content.thumbnails/src/main/java/org/apache/clerezza/platform/content/
incubator/clerezza/issues/CLEREZZA-25/org.apache.clerezza.platform.content.thumbnails/src/main/java/org/apache/clerezza/platform/content/thumbnails/
incubator/clerezza/issues/CLEREZZA-25/org.apache.clerezza.platform.content.thumbnails/src/main/java/org/apache/clerezza/platform/content/thumbnails/ThumbnailGenerator.java
Added:
incubator/clerezza/issues/CLEREZZA-25/org.apache.clerezza.platform.content.thumbnails/pom.xml
URL:
http://svn.apache.org/viewvc/incubator/clerezza/issues/CLEREZZA-25/org.apache.clerezza.platform.content.thumbnails/pom.xml?rev=890896&view=auto
==============================================================================
---
incubator/clerezza/issues/CLEREZZA-25/org.apache.clerezza.platform.content.thumbnails/pom.xml
(added)
+++
incubator/clerezza/issues/CLEREZZA-25/org.apache.clerezza.platform.content.thumbnails/pom.xml
Tue Dec 15 17:30:45 2009
@@ -0,0 +1,45 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?><project
xmlns="http://maven.apache.org/POM/4.0.0";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
http://maven.apache.org/maven-v4_0_0.xsd";>
+ <modelVersion>4.0.0</modelVersion>
+ <parent>
+ <artifactId>org.apache.clerezza.parent</artifactId>
+ <groupId>org.apache.clerezza</groupId>
+ <version>0.2-SNAPSHOT</version>
+ </parent>
+ <groupId>org.apache.clerezza</groupId>
+ <artifactId>org.apache.clerezza.platform.content.thumbnails</artifactId>
+ <version>0.1-SNAPSHOT</version>
+ <packaging>bundle</packaging>
+ <name>Clerezza - Platform Content Thumbnails</name>
+ <description>Provides a Meta Data Generator that generates thumbnails
for data of
+ various meta types</description>
+ <dependencies>
+ <dependency>
+ <groupId>org.osgi</groupId>
+ <artifactId>org.osgi.core</artifactId>
+ </dependency>
+ <dependency>
+ <groupId>org.osgi</groupId>
+ <artifactId>org.osgi.compendium</artifactId>
+ </dependency>
+ <dependency>
+ <groupId>org.apache.clerezza</groupId>
+ <artifactId>org.apache.clerezza.rdf.core</artifactId>
+ </dependency>
+ <dependency>
+ <groupId>org.apache.clerezza</groupId>
+ <artifactId>org.apache.clerezza.rdf.utils</artifactId>
+ </dependency>
+ <dependency>
+ <groupId>org.apache.clerezza</groupId>
+
<artifactId>org.apache.clerezza.platform.content</artifactId>
+ </dependency>
+ <dependency>
+ <groupId>org.apache.clerezza</groupId>
+
<artifactId>org.apache.clerezza.utils.imageprocessing</artifactId>
+ </dependency>
+ <dependency>
+ <groupId>org.apache.felix</groupId>
+
<artifactId>org.apache.felix.scr.annotations</artifactId>
+ </dependency>
+ </dependencies>
+</project>
Added:
incubator/clerezza/issues/CLEREZZA-25/org.apache.clerezza.platform.content.thumbnails/src/main/java/org/apache/clerezza/platform/content/thumbnails/ThumbnailGenerator.java
URL:
http://svn.apache.org/viewvc/incubator/clerezza/issues/CLEREZZA-25/org.apache.clerezza.platform.content.thumbnails/src/main/java/org/apache/clerezza/platform/content/thumbnails/ThumbnailGenerator.java?rev=890896&view=auto
==============================================================================
---
incubator/clerezza/issues/CLEREZZA-25/org.apache.clerezza.platform.content.thumbnails/src/main/java/org/apache/clerezza/platform/content/thumbnails/ThumbnailGenerator.java
(added)
+++
incubator/clerezza/issues/CLEREZZA-25/org.apache.clerezza.platform.content.thumbnails/src/main/java/org/apache/clerezza/platform/content/thumbnails/ThumbnailGenerator.java
Tue Dec 15 17:30:45 2009
@@ -0,0 +1,127 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.clerezza.platform.content.thumbnails;
+
+import java.awt.image.BufferedImage;
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import javax.imageio.ImageIO;
+import javax.ws.rs.core.MediaType;
+import org.apache.clerezza.platform.content.DiscobitsHandler;
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Property;
+import org.apache.felix.scr.annotations.Reference;
+import org.apache.felix.scr.annotations.Service;
+import org.apache.clerezza.rdf.core.UriRef;
+import org.apache.clerezza.utils.imageprocessing.ImageProcessor;
+import org.apache.clerezza.rdf.ontologies.DISCOBITS;
+import org.apache.clerezza.rdf.utils.GraphNode;
+import org.apache.clerezza.platform.content.MetaDataGenerator;
+import org.osgi.service.component.ComponentContext;
+import org.osgi.util.tracker.ServiceTracker;
+
+/**
+ * This class provides a method that generates a thumbnail for specified data
+ * if the specified media type is supported. The supported media types are
"image/*".
+ * The generated thumbnail is added as a property to the specified
+ * <code>GraphNode</code>. The property URI is
+ * "http://discobits.org/ontology#thumbnail";.
+ *
+ * @author mir
+ */
+...@component
+...@service(MetaDataGenerator.class)
+public class ThumbnailGenerator implements MetaDataGenerator {
+
+ @Property(intValue = 50, description = "Specifies the width of the
thumbnail.")
+ private static final String THUMBNAIL_WIDTH = "thumbnailWidth";
+ @Property(intValue = 50, description = "Specifies the height of the
thumbnail.")
+ private static final String THUMBNAIL_HEIGHT = "thumbnailHeight";
+ @Reference
+ private ImageProcessor imageProcessor;
+ private int widthThumbnail;
+ private int heightThumbnail;
+
+ private ServiceTracker discobitTracker;
+
+ protected void activate(ComponentContext context) {
+
+ widthThumbnail = (Integer)
context.getProperties().get(THUMBNAIL_WIDTH);
+ heightThumbnail = (Integer)
context.getProperties().get(THUMBNAIL_HEIGHT);
+
+ discobitTracker = new ServiceTracker(context.getBundleContext(),
+ DiscobitsHandler.class.getName(), null);
+ new Thread() {
+ @Override
+ public void run() {
+ discobitTracker.open();
+ }
+ }.start();
+ }
+
+ protected void deactivate(ComponentContext context) {
+ discobitTracker.close();
+ discobitTracker = null;
+ }
+
+ @Override
+ public void generate(GraphNode node, byte[] data, MediaType mediaType) {
+ if (node.getSubjects(DISCOBITS.thumbnail).hasNext()) {
+ return;
+ }
+ if (mediaType.getType().startsWith("image")) {
+ try {
+ BufferedImage buffImage = ImageIO.read(new
ByteArrayInputStream(data));
+ BufferedImage thumbnail =
imageProcessor.makeAThumbnail(buffImage, widthThumbnail, heightThumbnail);
+ byte[] thumbnailBytes =
bufferedImage2ByteArray(thumbnail, mediaType);
+ DiscobitsHandler contentHandler =
(DiscobitsHandler)discobitTracker.getService();
+ UriRef thumbnailUri =
createThumbnailUri((UriRef) node.getNode());
+ node.addProperty(DISCOBITS.thumbnail,
thumbnailUri);
+ contentHandler.put(thumbnailUri, mediaType,
thumbnailBytes);
+ } catch (IOException ex) {
+ return;
+ }
+ }
+ }
+
+ private byte[] bufferedImage2ByteArray(BufferedImage image,
+ MediaType mediaType) throws IOException {
+ ByteArrayOutputStream baos = new ByteArrayOutputStream();
+ ImageIO.write(image, mediaType.getSubtype(), baos);
+ byte[] bytes = baos.toByteArray();
+ baos.flush();
+ return bytes;
+ }
+
+ private UriRef createThumbnailUri(UriRef uriRef) {
+ String thumbnail = "_thumbnail";
+ String oldUri = uriRef.getUnicodeString();
+ String newUri;
+ int lastIndexOfDot = oldUri.lastIndexOf(".");
+ if (lastIndexOfDot >= (oldUri.length() - 4)) {
+ String firstPart = oldUri.substring(0, lastIndexOfDot);
+ String lastPart = oldUri.substring(lastIndexOfDot,
oldUri.length());
+ newUri = firstPart + thumbnail + lastPart;
+ } else {
+ newUri = oldUri + thumbnail;
+ }
+ return new UriRef(newUri);
+ }
+}
