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1
56
57 package dom.treewalker;
58 import java.io.ByteArrayOutputStream  ;
59 import java.io.OutputStreamWriter ;
60 import java.io.PrintWriter ;
61
62 import javax.xml.parsers.DocumentBuilder ;
63 import javax.xml.parsers.DocumentBuilderFactory ;
64 import javax.xml.parsers.ParserConfigurationException ;
65
66 import org.w3c.dom.Document ;
67 import org.w3c.dom.Element ;
68 import org.w3c.dom.Node ;
69 import org.w3c.dom.Text ;
70 import org.w3c.dom.traversal.DocumentTraversal;
71 import org.w3c.dom.traversal.NodeFilter;
72 import org.w3c.dom.traversal.TreeWalker;
73
74
75
82 public class TestFirstChild {
83
84 public static void main(String args[]) throws Exception {
85
86
87 System.out.println(" --- "
88 + org.enhydra.apache.xerces.framework.Version.fVersion
89 + " --- ");
90 Document doc = getNodeSet1();
91 NodeFilter nodefilter = null;
92 boolean entityReferenceExpansion = true;
93 int whatToShow = NodeFilter.SHOW_ALL;
94 TreeWalker treewalker =
95 ((DocumentTraversal) doc).createTreeWalker(doc, whatToShow,
96 nodefilter, entityReferenceExpansion);
97 ByteArrayOutputStream bytearrayoutputstream =
98 new ByteArrayOutputStream ();
99 PrintWriter printwriter =
100 new PrintWriter (new OutputStreamWriter (bytearrayoutputstream,
101 "UTF8"));
102
103 process2(treewalker, printwriter);
104 printwriter.flush();
105
106 System.out.println();
107 System.out.println("Testing the following XML document:\n" + new String (bytearrayoutputstream.toByteArray()));
108 }
109
110
116 private static Document getNodeSet1()
117 throws ParserConfigurationException {
118
119 DocumentBuilderFactory dfactory =
120 DocumentBuilderFactory.newInstance();
121
122 dfactory.setValidating(false);
123 dfactory.setNamespaceAware(true);
124
125 DocumentBuilder db = dfactory.newDocumentBuilder();
126 Document doc = db.newDocument();
127 Element root = doc.createElement("RootElement");
128 Element e1 = doc.createElement("Element1");
129 Element e2 = doc.createElement("Element2");
130 Element e3 = doc.createElement("Element3");
131 Text e3t = doc.createTextNode("Text in Element3");
132
133 e3.appendChild(e3t);
134 root.appendChild(e1);
135 root.appendChild(e2);
136 root.appendChild(e3);
137 doc.appendChild(root);
138
139 String s1 ="<RootElement><Element1/><Element2/><Element3>Text in Element3</Element3></RootElement>";
140
141 return doc;
142 }
143
144
153 private static void process2(TreeWalker treewalker,
154 PrintWriter printwriter) {
155
156 Node currentNode = treewalker.getCurrentNode();
157
158 switch (currentNode.getNodeType()) {
159
160 case Node.TEXT_NODE :
161 case Node.CDATA_SECTION_NODE :
162 printwriter.print(currentNode.getNodeValue());
163 break;
164
165 case Node.ENTITY_REFERENCE_NODE :
166 case Node.DOCUMENT_NODE :
167 case Node.ELEMENT_NODE :
168 default :
169 if (currentNode.getNodeType() == Node.ELEMENT_NODE) {
170 printwriter.print('<');
171 printwriter.print(currentNode.getNodeName());
172 printwriter.print(">");
173 }
174
175 Node node1 = treewalker.firstChild();
176
177 if (node1 == null) {
178 System.out.println(getNodeTypeString(currentNode.getNodeType())
179 + "_NODE parent: "
180 + currentNode.getNodeName()
181 + " has no children ");
182 }
183 else {
184 System.out.println(getNodeTypeString(currentNode.getNodeType())
185 + "_NODE parent: "
186 + currentNode.getNodeName()
187 + " has children ");
188
189 while (node1 != null) {
190 {
191 String qStr = "";
192
193 for (Node q = node1; q != null; q = q.getParentNode()) {
194 qStr = q.getNodeName() + "/" + qStr;
195 }
196
197 System.out.println(getNodeTypeString(currentNode.getNodeType())
198 + "_NODE process child " + qStr);
199 }
200
201
202 process2(treewalker, printwriter);
204
205 node1 = treewalker.nextSibling();
206 if (node1 != null) {
207 System.out.println("treewalker.nextSibling() = "
208 + node1.getNodeName());
209 }
210 } }
212
213 System.out.println("setCurrentNode() back to "
214 + currentNode.getNodeName());
215 treewalker.setCurrentNode(currentNode);
216
217 if (currentNode.getNodeType() == Node.ELEMENT_NODE) {
218 printwriter.print("</");
219 printwriter.print(currentNode.getNodeName());
220 printwriter.print(">");
221 }
222
223 break;
224 }
225 }
226
227
228 private static String [] nodeTypeString = new String []{ "", "ELEMENT",
229 "ATTRIBUTE",
230 "TEXT_NODE",
231 "CDATA_SECTION",
232 "ENTITY_REFERENCE",
233 "ENTITY",
234 "PROCESSING_INSTRUCTION",
235 "COMMENT",
236 "DOCUMENT",
237 "DOCUMENT_TYPE",
238 "DOCUMENT_FRAGMENT",
239 "NOTATION"};
240
241
242
243
255 public static String getNodeTypeString(short nodeType) {
256
257 if ((nodeType > 0) && (nodeType < 13)) {
258 return nodeTypeString[nodeType];
259 }
260 else {
261 return "";
262 }
263 }
264
265 }
266 |
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