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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.xml;
18  
19  import org.apache.tika.metadata.Metadata;
20  import org.xml.sax.Attributes;
21  import org.xml.sax.helpers.DefaultHandler;
22  
23  /**
24   * This adds Metadata entries with a specified name for
25   *  the textual content of a node (if present), and 
26   *  all attribute values passed through the matcher
27   *  (but not their names). 
28   */
29  public class MetadataHandler extends DefaultHandler {
30  
31      private final Metadata metadata;
32  
33      private final String name;
34  
35      private final StringBuilder buffer = new StringBuilder();
36  
37      public MetadataHandler(Metadata metadata, String name) {
38          this.metadata = metadata;
39          this.name = name;
40      }
41  
42      public void addMetadata(String value) {
43          if (value.length() > 0) {
44              String previous = metadata.get(name);
45              if (previous != null && previous.length() > 0) {
46                  value = previous + ", " + value;
47              }
48              metadata.set(name, value);
49          }
50      }
51  
52      public void endElement(String uri, String localName, String name) {
53          addMetadata(buffer.toString());
54          buffer.setLength(0);
55      }
56  
57      public void startElement(
58              String uri, String localName, String name, Attributes attributes) {
59          for (int i = 0; i < attributes.getLength(); i++) {
60              addMetadata(attributes.getValue(i));
61          }
62      }
63  
64      
65      public void characters(char[] ch, int start, int length) {
66          buffer.append(ch, start, length);
67      }
68  
69  }