1 package org.apache.maven.shared.release.transform.jdom;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 import java.util.Iterator;
23
24 import org.jdom.Element;
25 import org.jdom.Namespace;
26 import org.jdom.Text;
27
28 /**
29 * Common JDom functions
30 *
31 * @author Robert Scholte
32 * @since 3.0
33 */
34 public final class JDomUtils
35 {
36
37 private JDomUtils()
38 {
39 // noop
40 }
41
42 /**
43 * Updates the text value of the given element. The primary purpose of this method is to preserve any whitespace and
44 * comments around the original text value.
45 *
46 * @param element The element to update, must not be <code>null</code>.
47 * @param value The text string to set, must not be <code>null</code>.
48 */
49 public static void rewriteValue( Element element, String value )
50 {
51 Text text = null;
52 if ( element.getContent() != null )
53 {
54 for ( Iterator<?> it = element.getContent().iterator(); it.hasNext(); )
55 {
56 Object content = it.next();
57 if ( ( content instanceof Text ) && ( (Text) content ).getTextTrim().length() > 0 )
58 {
59 text = (Text) content;
60 while ( it.hasNext() )
61 {
62 content = it.next();
63 if ( content instanceof Text )
64 {
65 text.append( (Text) content );
66 it.remove();
67 }
68 else
69 {
70 break;
71 }
72 }
73 break;
74 }
75 }
76 }
77 if ( text == null )
78 {
79 element.addContent( value );
80 }
81 else
82 {
83 String chars = text.getText();
84 String trimmed = text.getTextTrim();
85 int idx = chars.indexOf( trimmed );
86 String leadingWhitespace = chars.substring( 0, idx );
87 String trailingWhitespace = chars.substring( idx + trimmed.length() );
88 text.setText( leadingWhitespace + value + trailingWhitespace );
89 }
90 }
91
92 public static Element rewriteElement( String name, String value, Element root, Namespace namespace )
93 {
94 Element tagElement = root.getChild( name, namespace );
95 if ( tagElement != null )
96 {
97 if ( value != null )
98 {
99 rewriteValue( tagElement, value );
100 }
101 else
102 {
103 int index = root.indexOf( tagElement );
104 root.removeContent( index );
105 for ( int i = index - 1; i >= 0; i-- )
106 {
107 if ( root.getContent( i ) instanceof Text )
108 {
109 root.removeContent( i );
110 }
111 else
112 {
113 break;
114 }
115 }
116 }
117 }
118 else
119 {
120 if ( value != null )
121 {
122 Element element = new Element( name, namespace );
123 element.setText( value );
124 root.addContent( " " ).addContent( element ).addContent( "\n " );
125 tagElement = element;
126 }
127 }
128 return tagElement;
129 }
130
131
132 }