cdmlib-services/src/main/java/eu/etaxonomy/cdm/api/service/media/MediaInfoFactory.java

   1 /**
   2 * Copyright (C) 2021 EDIT
   3 * European Distributed Institute of Taxonomy
   4 * http://www.e-taxonomy.eu
   5 *
   6 * The contents of this file are subject to the Mozilla Public License Version 1.1
   7 * See LICENSE.TXT at the top of this package for the full license terms.
   8 */
   9 package eu.etaxonomy.cdm.api.service.media;
  10
  11 import java.io.IOException;
  12 import java.util.ArrayList;
  13 import java.util.List;
  14
  15 import org.apache.http.HttpException;
  16 import org.apache.logging.log4j.LogManager;import org.apache.logging.log4j.Logger;
  17 import org.springframework.stereotype.Component;
  18
  19 import eu.etaxonomy.cdm.common.URI;
  20 import eu.etaxonomy.cdm.common.media.CdmImageInfo;
  21
  22 /**
  23  * @author a.kohlbecker
  24  * @since May 5, 2021
  25  */
  26 @Component
  27 public class MediaInfoFactory implements IMediaInfoFactory {
  28
  29     private static final Logger logger = LogManager.getLogger(MediaInfoFactory.class);
  30
  31     /**
  32      * TODO needs to be managed in CDM PREFERENCES per service and version.
  33      *
  34      * ./MediaInfoService/1.0/ --> MediaUriTransformation
  35      */
  36     private List<MediaUriTransformation> mediaInfoService_1_0_Transformations = new ArrayList<>();
  37
  38     public MediaInfoFactory() {
  39         mediaInfoService_1_0_Transformations.addAll(DefaultMediaTransformations.bgbmMediaMetadataService());
  40     }
  41
  42     /**
  43      * This method only exists due to performance issues for cases when
  44      * the {@link MediaInfoFileReader} to reduce the overhead imposed by reading
  45      * the image metadata from the file itself.
  46      */
  47     @Override
  48     public CdmImageInfo cdmImageInfo(URI imageUri, boolean forceMetaData) throws IOException, HttpException {
  49
  50         List<URI> metadataServiceURIs = applyURITransformations(imageUri);
  51         if(!metadataServiceURIs.isEmpty()) {
  52             // :-) Hooray, we can get the metadata from the web service, this is going to be snappy
  53             try {
  54                 return new MediaInfoServiceReader(imageUri, metadataServiceURIs.get(0))
  55                         .read()
  56                         .getCdmImageInfo();
  57             } catch (Exception e) {
  58                 logger.warn("Meta data could not be read from meta data service ("+e.getMessage()+"): " + imageUri.toString());
  59                 //if an exception occurs read data from original file
  60             }
  61         }
  62
  63         // :-( need to use the files reader
  64         MediaInfoFileReader mediaReader = new MediaInfoFileReader(imageUri).readBaseInfo();
  65         AbstactMediaMetadataReader reader = forceMetaData ? mediaReader.readMetaData() : mediaReader;
  66         return reader.getCdmImageInfo();
  67
  68     }
  69
  70     protected List<URI> applyURITransformations(URI imageUri) {
  71         MediaUriTransformationProcessor processor = new MediaUriTransformationProcessor();
  72         processor.addAll(mediaInfoService_1_0_Transformations);
  73         List<URI> metadataServiceURIs = processor.applyTo(imageUri);
  74         return metadataServiceURIs;
  75     }
  76 }