1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19 package org.apache.myfaces.shared.util.xml;
20
21 import org.w3c.dom.Element;
22 import org.w3c.dom.Node;
23 import org.w3c.dom.NodeList;
24
25 import java.util.ArrayList;
26 import java.util.Collections;
27 import java.util.List;
28
29 public class XmlUtils
30 {
31 private XmlUtils()
32 {
33 // hide from public access
34 }
35
36 public static String getElementText(Element elem)
37 {
38 StringBuilder buf = new StringBuilder();
39 NodeList nodeList = elem.getChildNodes();
40 for (int i = 0, len = nodeList.getLength(); i < len; i++)
41 {
42 Node n = nodeList.item(i);
43 if (n.getNodeType() == Node.TEXT_NODE)
44 {
45 buf.append(n.getNodeValue());
46 }
47 else
48 {
49 //TODO see jsf-samples
50 //throw new FacesException("Unexpected node type " + n.getNodeType());
51 }
52 }
53 return buf.toString();
54 }
55
56
57
58 /**
59 * Return content of child element with given tag name.
60 * If more than one children with this name are present, the content of the last
61 * element is returned.
62 *
63 * @param elem
64 * @param childTagName
65 * @return content of child element or null if no child element with this name was found
66 */
67 public static String getChildText(Element elem, String childTagName)
68 {
69 NodeList nodeList = elem.getElementsByTagName(childTagName);
70 int len = nodeList.getLength();
71 if (len == 0)
72 {
73 return null;
74 }
75
76 return getElementText((Element)nodeList.item(len - 1));
77
78 }
79
80
81 /**
82 * Return list of content Strings of all child elements with given tag name.
83 * @param elem
84 * @param childTagName
85 * @return List
86 */
87 public static List getChildTextList(Element elem, String childTagName)
88 {
89 NodeList nodeList = elem.getElementsByTagName(childTagName);
90 int len = nodeList.getLength();
91 if (len == 0)
92 {
93 return Collections.EMPTY_LIST;
94 }
95
96 List list = new ArrayList(len);
97 for (int i = 0; i < len; i++)
98 {
99 list.add(getElementText((Element)nodeList.item(i)));
100 }
101 return list;
102
103 }
104
105 }