Thumbnail Service: Added PDF to Image transformer and added complex transformers to allow documents to be thumbnailed as images

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@9997 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/repo/content/transform/PdfToImageContentTransformer.java

@@ -0,0 +1,125 @@
+/*
+ * Copyright (C) 2005-2007 Alfresco Software Limited.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+
+ * This program 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 General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+
+ * As a special exception to the terms and conditions of version 2.0 of 
+ * the GPL, you may redistribute this Program in connection with Free/Libre 
+ * and Open Source Software ("FLOSS") applications as described in Alfresco's 
+ * FLOSS exception.  You should have recieved a copy of the text describing 
+ * the FLOSS exception, and it is also available here: 
+ * http://www.alfresco.com/legal/licensing"
+ */
+package org.alfresco.repo.content.transform;
+
+import java.awt.Rectangle;
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.RandomAccessFile;
+import java.nio.ByteBuffer;
+import java.nio.channels.FileChannel;
+
+import javax.imageio.ImageIO;
+
+import org.alfresco.error.AlfrescoRuntimeException;
+import org.alfresco.repo.content.MimetypeMap;
+import org.alfresco.service.cmr.repository.ContentReader;
+import org.alfresco.service.cmr.repository.ContentWriter;
+import org.alfresco.service.cmr.repository.TransformationOptions;
+import org.alfresco.util.TempFileProvider;
+
+import com.sun.pdfview.PDFFile;
+import com.sun.pdfview.PDFPage;
+
+/**
+ * Makes use of the {@link http://www.pdfbox.org/ PDFBox} library to
+ * perform conversions from PDF files to images.
+ * 
+ * @author Roy Wetherall
+ */
+public class PdfToImageContentTransformer extends AbstractContentTransformer2
+{
+    /**
+     * Currently the only transformation performed is that of text extraction from PDF documents.
+     */
+    public boolean isTransformable(String sourceMimetype, String targetMimetype, TransformationOptions options)
+    {
+        if (MimetypeMap.MIMETYPE_PDF.equals(sourceMimetype) == true &&
+            MimetypeMap.MIMETYPE_IMAGE_PNG.equals(targetMimetype) == true)
+        {
+            // only support PDF -> PNG
+            return true;
+        }
+        else
+        {
+            return false;
+        }
+    }
+
+    protected void transformInternal(
+            ContentReader reader,
+            ContentWriter writer,
+            TransformationOptions options) throws Exception
+    {
+        RandomAccessFile raf;
+        try 
+        {
+           File file = TempFileProvider.createTempFile("pdfToImage", ".pdf");
+           reader.getContent(file);
+                        
+           raf = new RandomAccessFile(file, "r");
+           FileChannel channel = raf.getChannel();
+          
+           ByteBuffer buf = channel.map(FileChannel.MapMode.READ_ONLY, 0, channel.size());
+            
+           PDFFile pdffile = new PDFFile(buf);
+           PDFPage page = pdffile.getPage(0);
+            
+           //get the width and height for the doc at the default zoom              
+           int width=(int)page.getBBox().getWidth();
+           int height=(int)page.getBBox().getHeight();
+            
+           Rectangle rect = new Rectangle(0,0,width,height);
+           int rotation=page.getRotation();
+           Rectangle rect1=rect;
+           if (rotation==90 || rotation==270)
+               rect1=new Rectangle(0,0,rect.height,rect.width);
+            
+           //generate the image
+           BufferedImage img = (BufferedImage)page.getImage(
+                        rect.width, rect.height, //width & height
+                        rect1, // clip rect
+                        null, // null for the ImageObserver
+                        true, // fill background with white
+                        true  // block until drawing is done
+                );
+
+           File outputFile = TempFileProvider.createTempFile("pdfToImageOutput", ".png");
+           ImageIO.write(img, "png", outputFile);
+            
+           writer.putContent(outputFile);
+        } 
+        catch (FileNotFoundException e1) 
+        {
+           throw new AlfrescoRuntimeException("Unable to create image from pdf file.", e1);
+        } 
+        catch (IOException e) 
+        {
+           throw new AlfrescoRuntimeException("Unable to create image from pdf file.", e);
+        }
+    }
+}

source/java/org/alfresco/repo/thumbnail/CreateThumbnailActionExecuter.java

@@ -30,6 +30,7 @@ import org.alfresco.error.AlfrescoRuntimeException;
 import org.alfresco.model.ContentModel;
 import org.alfresco.repo.action.ParameterDefinitionImpl;
 import org.alfresco.repo.action.executer.ActionExecuterAbstractBase;
+import org.alfresco.repo.node.NodeRefPropertyMethodInterceptor;
 import org.alfresco.service.cmr.action.Action;
 import org.alfresco.service.cmr.action.ParameterDefinition;
 import org.alfresco.service.cmr.dictionary.DataTypeDefinition;
@@ -37,6 +38,8 @@ import org.alfresco.service.cmr.repository.NodeRef;
 import org.alfresco.service.cmr.repository.NodeService;
 import org.alfresco.service.cmr.thumbnail.ThumbnailService;
 import org.alfresco.service.namespace.QName;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
 
 /**
  * Create thumbnail action executer.
@@ -47,6 +50,8 @@ import org.alfresco.service.namespace.QName;
  */
 public class CreateThumbnailActionExecuter extends ActionExecuterAbstractBase
 {
+    private static Log logger = LogFactory.getLog(CreateThumbnailActionExecuter.class);
+    
     /** Thumbnail Service */
     private ThumbnailService thumbnailService;
     
@@ -105,8 +110,15 @@ public class CreateThumbnailActionExecuter extends ActionExecuterAbstractBase
                 contentProperty = ContentModel.PROP_CONTENT;
             }
             
-            // Create the thumbnail
-            this.thumbnailService.createThumbnail(actionedUponNodeRef, contentProperty, details.getMimetype(), details.getTransformationOptions(), thumbnailName, null);
+            try
+            {
+                // Create the thumbnail
+                this.thumbnailService.createThumbnail(actionedUponNodeRef, contentProperty, details.getMimetype(), details.getTransformationOptions(), thumbnailName, null);
+            }
+            catch (Exception exception)
+            {
+                logger.info("Creation of thumbnail '" + details.getName() + "' failed");
+            }
         }
     }