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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *     http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.tika.parser.jpeg;
18  
19  import java.io.IOException;
20  import java.io.InputStream;
21  import java.util.Iterator;
22  
23  import org.apache.tika.exception.TikaException;
24  import org.apache.tika.metadata.Metadata;
25  import org.xml.sax.SAXException;
26  
27  import com.drew.imaging.jpeg.JpegMetadataReader;
28  import com.drew.imaging.jpeg.JpegProcessingException;
29  import com.drew.metadata.Directory;
30  import com.drew.metadata.MetadataException;
31  import com.drew.metadata.Tag;
32  
33  class JpegExtractor {
34  
35      private final Metadata metadata;
36  
37      public JpegExtractor(Metadata metadata) {
38          this.metadata = metadata;
39      }
40  
41      public void parse(InputStream stream)
42              throws IOException, SAXException, TikaException {
43          try {
44              com.drew.metadata.Metadata jpegMetadata =
45                  JpegMetadataReader.readMetadata(stream);
46  
47              Iterator<?> directories = jpegMetadata.getDirectoryIterator();
48              while (directories.hasNext()) {
49                  Directory directory = (Directory) directories.next();
50                  Iterator<?> tags = directory.getTagIterator();
51  
52                  while (tags.hasNext()) {
53                      Tag tag = (Tag)tags.next();
54                      metadata.set(tag.getTagName(), tag.getDescription());
55                  }
56              }
57          } catch (JpegProcessingException e) {
58              throw new TikaException("Can't read JPEG metadata", e);
59          } catch (MetadataException e) {
60              throw new TikaException("Can't read JPEG metadata", e);
61          }
62      }
63  
64  }