git.aero2k.de Git - tmp/jakarta-migration.git/blob

   1 package org.collectionspace.services.nuxeo.extension.thumbnail;
   2
   3
   4 import java.io.IOException;
   5 import java.io.Serializable;
   6 import java.security.NoSuchAlgorithmException;
   7 import java.util.Calendar;
   8 import java.util.GregorianCalendar;
   9
  10 import org.apache.commons.logging.Log;
  11 import org.apache.commons.logging.LogFactory;
  12 import org.nuxeo.ecm.core.api.Blob;
  13 import org.nuxeo.ecm.core.api.ClientException;
  14 import org.nuxeo.ecm.core.api.CoreSession;
  15 import org.nuxeo.ecm.core.api.DocumentModel;
  16 import org.nuxeo.ecm.core.api.UnrestrictedSessionRunner;
  17 import org.nuxeo.ecm.core.api.blobholder.BlobHolder;
  18 import org.nuxeo.ecm.core.convert.api.ConversionService;
  19 import org.nuxeo.ecm.platform.filemanager.api.FileManager;
  20 import org.nuxeo.runtime.api.Framework;
  21
  22 public class AddThumbnailUnrestricted extends UnrestrictedSessionRunner {
  23
  24     private static final Log logger = LogFactory
  25             .getLog(AddThumbnailUnrestricted.class);
  26
  27     protected ConversionService cs;
  28
  29     protected DocumentModel doc;
  30
  31     protected BlobHolder blobHolder;
  32
  33     protected Thumbnail thumbnail = null;
  34
  35     public AddThumbnailUnrestricted(CoreSession coreSession, DocumentModel doc,
  36             BlobHolder blobHolder) {
  37         super(coreSession);
  38         this.doc = doc;
  39         this.blobHolder = blobHolder;
  40     }
  41
  42     /*
  43      * (non-Javadoc)
  44      * @see org.nuxeo.ecm.core.api.UnrestrictedSessionRunner#run()
  45      *
  46      * Creates a new thumbnail image and associates it with the document blob by adding a "Thumnail" facet
  47      * to the document blob.
  48      */
  49     @Override
  50     public void run() throws ClientException {
  51         String errMsg = "Error while adding preview thumbnail.";
  52         String documentId = doc.getId();
  53
  54         try {
  55             Blob blob = blobHolder.getBlob();
  56             if (blob != null) {
  57                 if (doc.hasFacet(ThumbnailConstants.THUMBNAIL_FACET) == false) { // Make sure we don't already have a "Thumbnail" facet
  58                         cs = Framework.getService(ConversionService.class);
  59                         ensureModificationDateExists(doc); // For some reason, the ConversionService service requires the modification date of the blob is not null so we need to ensure it is not null.
  60                         BlobHolder thumbnailBlobHolder = cs.convert(ThumbnailConstants.THUMBNAIL_CONVERTER_NAME,
  61                                 blobHolder, null /*no params*/);
  62                         if (thumbnailBlobHolder != null && thumbnailBlobHolder.getBlob() != null) {
  63                             Blob thumbnailBlob = thumbnailBlobHolder.getBlob();
  64                                 doc.addFacet(ThumbnailConstants.THUMBNAIL_FACET); // Add the "Thumbnail" facet since we were able to create a thumnail image
  65                                 // Give the thumbnail blob a name.
  66                             String thumbnailName = documentId + ThumbnailConstants.THUMBNAIL_PROPERTY_NAME;
  67                             thumbnailBlobHolder.getBlob().setFilename(thumbnailName); // Give it a name so we can manually search for it in the "nuxeo" database
  68
  69                             doc.setProperty(ThumbnailConstants.THUMBNAIL_SCHEMA_NAME,
  70                                     ThumbnailConstants.THUMBNAIL_FILENAME_PROPERTY_NAME,
  71                                     (Serializable) thumbnailName);
  72                             doc.setProperty(ThumbnailConstants.THUMBNAIL_SCHEMA_NAME,
  73                                     ThumbnailConstants.THUMBNAIL_PROPERTY_NAME,
  74                                     (Serializable) thumbnailBlob);
  75                             //
  76                             // Save the new Thumnail facet data (including the new thumbnail image).  The save triggers a new create event and recurses us back to
  77                             // this method, but the next time we'll have a Thumbnail facet and bypass this save -sparing us from an infinite event loop.
  78                             //
  79                             doc = session.saveDocument(doc);
  80                         } else {
  81                                 logger.warn("Could not create a preview thumbnail image for Nuxeo blob document: " + doc.getId());
  82                         }
  83                 }
  84             } else {
  85                 logger.warn(errMsg + " " + "The Nuxeo blob holder had an empty blob object.  Document ID:" + doc.getId());
  86             }
  87         } catch (Exception e) {
  88             logger.warn(errMsg, e);
  89         }
  90     }
  91
  92     private String computeDigest(FileManager fileManager, Blob blob) throws Exception {
  93         String result = null;
  94
  95         // Compute the digest
  96         result = fileManager.computeDigest(blob); // REM - Warning: Why is this operation so slow?
  97
  98         return result;
  99     }
 100
 101     private String ensureModificationDateExists(DocumentModel docModel) throws Exception {
 102         Calendar modificationDate = (Calendar)doc.getProperty("dublincore", "modified");
 103         if (modificationDate == null) {
 104                 // If the 'modified' field is null then try the 'created' field
 105                 Calendar creationDate = (Calendar)doc.getProperty("dublincore", "created");
 106                 if (creationDate != null) {
 107                         modificationDate = creationDate;
 108                 } else {
 109                         // We *need* a 'modified' date, so let's use the current date
 110                         modificationDate = new GregorianCalendar();
 111                 }
 112                 doc.setProperty("dublincore", "modified", modificationDate);
 113         }
 114
 115         return modificationDate.toString();
 116     }
 117
 118     public Thumbnail getAdapter() {
 119         return thumbnail;
 120     }
 121
 122 }