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 /**
30 * @author Manfred Geiler (latest modification by $Author: lu4242 $)
31 * @version $Revision: 1215303 $ $Date: 2011-12-16 16:46:52 -0500 (Fri, 16 Dec 2011) $
32 */
33 public class XmlUtils
34 {
35 private XmlUtils()
36 {
37 // hide from public access
38 }
39
40 public static String getElementText(Element elem)
41 {
42 StringBuilder buf = new StringBuilder();
43 NodeList nodeList = elem.getChildNodes();
44 for (int i = 0, len = nodeList.getLength(); i < len; i++)
45 {
46 Node n = nodeList.item(i);
47 if (n.getNodeType() == Node.TEXT_NODE)
48 {
49 buf.append(n.getNodeValue());
50 }
51 else
52 {
53 //TODO see jsf-samples
54 //throw new FacesException("Unexpected node type " + n.getNodeType());
55 }
56 }
57 return buf.toString();
58 }
59
60
61
62 /**
63 * Return content of child element with given tag name.
64 * If more than one children with this name are present, the content of the last
65 * element is returned.
66 *
67 * @param elem
68 * @param childTagName
69 * @return content of child element or null if no child element with this name was found
70 */
71 public static String getChildText(Element elem, String childTagName)
72 {
73 NodeList nodeList = elem.getElementsByTagName(childTagName);
74 int len = nodeList.getLength();
75 if (len == 0)
76 {
77 return null;
78 }
79
80 return getElementText((Element)nodeList.item(len - 1));
81
82 }
83
84
85 /**
86 * Return list of content Strings of all child elements with given tag name.
87 * @param elem
88 * @param childTagName
89 * @return List
90 */
91 public static List getChildTextList(Element elem, String childTagName)
92 {
93 NodeList nodeList = elem.getElementsByTagName(childTagName);
94 int len = nodeList.getLength();
95 if (len == 0)
96 {
97 return Collections.EMPTY_LIST;
98 }
99
100 List list = new ArrayList(len);
101 for (int i = 0; i < len; i++)
102 {
103 list.add(getElementText((Element)nodeList.item(i)));
104 }
105 return list;
106
107 }
108
109 }