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1
19
20 package org.netbeans.modules.db.test;
21
22 import java.util.regex.Pattern  ;
23 import org.w3c.dom.Attr ;
24 import org.w3c.dom.Document ;
25 import org.w3c.dom.Element ;
26 import org.w3c.dom.NamedNodeMap ;
27 import org.w3c.dom.Node ;
28 import org.w3c.dom.NodeList ;
29
30
37 public class DOMCompare {
38
39 private DOMCompare() {
40 }
41
42 public static boolean compareDocuments(Document doc1, Document doc2) {
43 Element e1 = doc1.getDocumentElement();
44 Element e2 = doc2.getDocumentElement();
45
46 return compareElements(e1, e2);
47 }
48
49 private static boolean compareElements(Element e1, Element e2) {
50 if (!e1.getLocalName().equals(e2.getLocalName())) {
51 System.out.println("Different local names " + e1.getLocalName() + " and " + e2.getLocalName());
52 return false;
53 }
54 if (!compareStrings(e1.getNamespaceURI(), e2.getNamespaceURI())) {
55 System.out.println("Different namespaces " + e1.getNamespaceURI() + " and " + e2.getNamespaceURI());
56 return false;
57 }
58 if (!compareElementAttrs(e1, e2)) {
59 return false;
60 }
61 if (!compareElementChildren(e1, e2)) {
62 return false;
63 }
64 return true;
65 }
66
67 private static boolean compareElementAttrs(Element e1, Element e2) {
68 NamedNodeMap at1 = e1.getAttributes();
69 NamedNodeMap at2 = e2.getAttributes();
70 if (at1.getLength() != at2.getLength()) {
71 System.out.println("Different number of attributes");
72 }
73 for (int i = 0; i < at1.getLength(); i++) {
74 Attr attr1 = (Attr )at1.item(i);
75 Attr attr2 = (Attr )at2.getNamedItemNS(attr1.getNamespaceURI(), attr1.getLocalName());
76 if (attr2 == null) {
77 System.out.println("Attribute " + attr1.getNodeName() + " not found");
78 return false;
79 }
80 if (!compareStrings(attr1.getNodeValue(), attr2.getNodeValue())) {
81 System.out.println("Different attributes " + attr1.getNodeName() + " and " + attr2.getNodeName());
82 return false;
83 }
84 }
85 return true;
86 }
87
88 private static boolean compareElementChildren(Element e1, Element e2) {
89 NodeList ch1 = e1.getChildNodes();
90 NodeList ch2 = e2.getChildNodes();
91 int i1 = 0;
92 int i2 = 0;
93 for (;;) {
94 while (i1 < ch1.getLength()) {
95 Node node = ch1.item(i1);
96 int type = node.getNodeType();
97 if (type == Node.ELEMENT_NODE) {
98 break;
99 } else if (type == Node.TEXT_NODE) {
100 if (!isWhitespace(node.getNodeValue())) {
101 break;
102 }
103 } else {
104 System.out.println("Unsupported node type " + type);
105 return false;
106 }
107 i1++;
108 }
109 while (i2 < ch2.getLength()) {
110 Node node = ch2.item(i2);
111 int type = node.getNodeType();
112 if (type == Node.ELEMENT_NODE) {
113 break;
114 } else if (type == Node.TEXT_NODE) {
115 if (!isWhitespace(node.getNodeValue())) {
116 break;
117 }
118 } else {
119 System.out.println("Unsupported node type " + type);
120 return false;
121 }
122 i2++;
123 }
124 if (i1 < ch1.getLength() && i2 < ch2.getLength()) {
125 if (ch1.item(i1).getNodeType() != ch2.item(i2).getNodeType()) {
126 System.out.println("Different element types: " + ch1.item(i1).getNodeType() + " and " + ch2.item(i2).getNodeType());
127 return false;
128 }
129 switch (ch1.item(i1).getNodeType()) {
130 case Node.ELEMENT_NODE:
131 if (!compareElements((Element )ch1.item(i1), (Element )ch2.item(i2))) {
132 System.out.println("Different elements " + getElementStringRep((Element )ch1.item(i1)) + " and " + getElementStringRep((Element )ch2.item(i2)));
133 return false;
134 }
135 break;
136 case Node.TEXT_NODE:
137 if (!compareStrings(ch1.item(i1).getNodeValue(), ch2.item(i2).getNodeValue())) {
138 System.out.println("Different text content '" + ch1.item(i1).getNodeValue() + "' and '" + ch2.item(i2).getNodeValue() + "'");
139 return false;
140 }
141 break;
142 default:
143 assert false;
144 }
145 i1++;
146 i2++;
147 } else {
148 if (i1 >= ch1.getLength() && i2 >= ch2.getLength()) {
149 return true;
150 } else {
151 System.out.println("More children in " + getElementStringRep((Element )e1));
152 return false;
153 }
154 }
155 }
156 }
157
158 private static String getElementStringRep(Element el) {
159 String result = el.getLocalName();
160 if (el.getNamespaceURI() != null) {
161 result = el.getNamespaceURI() + ":" + result;
162 }
163 return result;
164 }
165
166 private static boolean compareStrings(String str1, String str2) {
167 return (str1 == null) ? str2 == null : str1.equals(str2);
168 }
169
170 private static boolean isWhitespace(String s) {
171 return Pattern.matches("^[ \t\r\n]+$", s);
172 }
173 }
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