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   1 package org.collectionspace.services.nuxeo.extension.thumbnail;
   2
   3 /*
   4  * An example Nuxeo event "listener".
   5  */
   6
   7 import java.io.Serializable;
   8 import java.util.Calendar;
   9 import java.util.GregorianCalendar;
  10
  11 import org.apache.commons.logging.Log;
  12 import org.apache.commons.logging.LogFactory;
  13 import org.nuxeo.ecm.core.api.Blob;
  14 import org.nuxeo.ecm.core.api.ClientException;
  15 import org.nuxeo.ecm.core.api.CoreSession;
  16 import org.nuxeo.ecm.core.api.DocumentModel;
  17 import org.nuxeo.ecm.core.api.UnrestrictedSessionRunner;
  18 import org.nuxeo.ecm.core.api.blobholder.BlobHolder;
  19 import org.nuxeo.ecm.core.convert.api.ConversionService;
  20 import org.nuxeo.ecm.platform.filemanager.api.FileManager;
  21 import org.nuxeo.runtime.api.Framework;
  22
  23 public class AddThumbnailUnrestricted extends UnrestrictedSessionRunner {
  24
  25     private static final Log logger = LogFactory
  26             .getLog(AddThumbnailUnrestricted.class);
  27
  28     protected ConversionService cs;
  29
  30     protected DocumentModel doc;
  31
  32     protected BlobHolder blobHolder;
  33
  34     protected Thumbnail thumbnail = null;
  35
  36     public AddThumbnailUnrestricted(CoreSession coreSession, DocumentModel doc,
  37             BlobHolder blobHolder) {
  38         super(coreSession);
  39         this.doc = doc;
  40         this.blobHolder = blobHolder;
  41     }
  42
  43     /*
  44      * (non-Javadoc)
  45      * @see org.nuxeo.ecm.core.api.UnrestrictedSessionRunner#run()
  46      *
  47      * Creates a new thumbnail image and associates it with the document blob by adding a "Thumbnail" facet
  48      * to the document blob.
  49      */
  50     @Override
  51     public void run() throws ClientException {
  52         String errMsg = "Error while adding preview thumbnail.";
  53         String documentId = doc.getId();
  54
  55         try {
  56             Blob blob = blobHolder.getBlob();
  57             if (blob != null) {
  58                 if (doc.hasFacet(ThumbnailConstants.THUMBNAIL_FACET) == false) { // Make sure we don't already have a "Thumbnail" facet
  59                         cs = Framework.getService(ConversionService.class);
  60                         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.
  61                         BlobHolder thumbnailBlobHolder = cs.convert(ThumbnailConstants.THUMBNAIL_CONVERTER_NAME,
  62                                 blobHolder, null /*no params*/);
  63                         if (thumbnailBlobHolder != null && thumbnailBlobHolder.getBlob() != null) {
  64                             Blob thumbnailBlob = thumbnailBlobHolder.getBlob();
  65                                 doc.addFacet(ThumbnailConstants.THUMBNAIL_FACET); // Add the "Thumbnail" facet since we were able to create a thumnail image
  66                                 // Give the thumbnail blob a name.
  67                             String thumbnailName = documentId + ThumbnailConstants.THUMBNAIL_PROPERTY_NAME;
  68                             thumbnailBlobHolder.getBlob().setFilename(thumbnailName); // Give it a name so we can manually search for it in the "nuxeo" database
  69
  70                             doc.setProperty(ThumbnailConstants.THUMBNAIL_SCHEMA_NAME,
  71                                     ThumbnailConstants.THUMBNAIL_FILENAME_PROPERTY_NAME,
  72                                     (Serializable) thumbnailName);
  73                             doc.setProperty(ThumbnailConstants.THUMBNAIL_SCHEMA_NAME,
  74                                     ThumbnailConstants.THUMBNAIL_PROPERTY_NAME,
  75                                     (Serializable) thumbnailBlob);
  76                             //
  77                             // Save the new Thumnail facet data (including the new thumbnail image).  The save triggers a new create event and recurses us back to
  78                             // this method, but the next time we'll have a Thumbnail facet and bypass this save -sparing us from an infinite event loop.
  79                             //
  80                             doc = session.saveDocument(doc);
  81                         } else {
  82                                 logger.warn("Could not create a preview thumbnail image for Nuxeo blob document: " + doc.getId());
  83                         }
  84                 }
  85             } else {
  86                 logger.warn(errMsg + " " + "The Nuxeo blob holder had an empty blob object.  Document ID:" + doc.getId());
  87             }
  88         } catch (Exception e) {
  89             logger.warn(errMsg, e);
  90         }
  91     }
  92
  93     private String computeDigest(FileManager fileManager, Blob blob) throws Exception {
  94         String result = null;
  95
  96         // Compute the digest
  97 //        result = fileManager.computeDigest(blob); // REM - Warning: Why is this operation so slow?
  98         result = blob.getDigest();
  99
 100         return result;
 101     }
 102
 103     private String ensureModificationDateExists(DocumentModel docModel) throws Exception {
 104         Calendar modificationDate = (Calendar)doc.getProperty("dublincore", "modified");
 105         if (modificationDate == null) {
 106                 // If the 'modified' field is null then try the 'created' field
 107                 Calendar creationDate = (Calendar)doc.getProperty("dublincore", "created");
 108                 if (creationDate != null) {
 109                         modificationDate = creationDate;
 110                 } else {
 111                         // We *need* a 'modified' date, so let's use the current date
 112                         modificationDate = new GregorianCalendar();
 113                 }
 114                 doc.setProperty("dublincore", "modified", modificationDate);
 115         }
 116
 117         return modificationDate.toString();
 118     }
 119
 120     public Thumbnail getAdapter() {
 121         return thumbnail;
 122     }
 123
 124 }