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 }