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.maven.shared.release.transform.jdom2;
20
21 import java.util.Iterator;
22
23 import org.jdom2.Element;
24 import org.jdom2.Namespace;
25 import org.jdom2.Text;
26
27 /**
28 * Common JDOM2 functions
29 *
30 * @author Robert Scholte
31 * @since 3.0
32 */
33 public final class JDomUtils {
34
35 private JDomUtils() {
36 // noop
37 }
38
39 /**
40 * Updates the text value of the given element. The primary purpose of this method is to preserve any whitespace and
41 * comments around the original text value.
42 *
43 * @param element The element to update, must not be <code>null</code>.
44 * @param value The text string to set, must not be <code>null</code>.
45 */
46 public static void rewriteValue(Element element, String value) {
47 Text text = null;
48 if (element.getContent() != null) {
49 for (Iterator<?> it = element.getContent().iterator(); it.hasNext(); ) {
50 Object content = it.next();
51 if ((content instanceof Text) && ((Text) content).getTextTrim().length() > 0) {
52 text = (Text) content;
53 while (it.hasNext()) {
54 content = it.next();
55 if (content instanceof Text) {
56 text.append((Text) content);
57 it.remove();
58 } else {
59 break;
60 }
61 }
62 break;
63 }
64 }
65 }
66 if (text == null) {
67 element.addContent(value);
68 } else {
69 String chars = text.getText();
70 String trimmed = text.getTextTrim();
71 int idx = chars.indexOf(trimmed);
72 String leadingWhitespace = chars.substring(0, idx);
73 String trailingWhitespace = chars.substring(idx + trimmed.length());
74 text.setText(leadingWhitespace + value + trailingWhitespace);
75 }
76 }
77
78 /**
79 * <p>rewriteElement.</p>
80 *
81 * @param name a {@link java.lang.String} object
82 * @param value a {@link java.lang.String} object
83 * @param root a {@link org.jdom2.Element} object
84 * @param namespace a {@link org.jdom2.Namespace} object
85 * @return a {@link org.jdom2.Element} object
86 */
87 public static Element rewriteElement(String name, String value, Element root, Namespace namespace) {
88 Element tagElement = root.getChild(name, namespace);
89 if (tagElement != null) {
90 if (value != null) {
91 rewriteValue(tagElement, value);
92 } else {
93 int index = root.indexOf(tagElement);
94 root.removeContent(index);
95 for (int i = index - 1; i >= 0; i--) {
96 if (root.getContent(i) instanceof Text) {
97 root.removeContent(i);
98 } else {
99 break;
100 }
101 }
102 }
103 } else {
104 if (value != null) {
105 Element element = new Element(name, namespace);
106 element.setText(value);
107 root.addContent(" ").addContent(element).addContent("\n ");
108 tagElement = element;
109 }
110 }
111 return tagElement;
112 }
113 }