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17
18
19
20 package org.apache.lenya.xml;
21
22 import java.io.FileNotFoundException  ;
23 import java.io.PrintWriter ;
24 import java.util.Properties ;
25 import java.util.Vector ;
26
27 import org.apache.lenya.xml.xpointer.XPointer;
28 import org.apache.log4j.Category;
29 import org.w3c.dom.Document ;
30 import org.w3c.dom.Element ;
31 import org.w3c.dom.Node ;
32 import org.w3c.dom.NodeList ;
33
34 public class XPointerFactory {
35 static Category log = Category.getInstance(XPointerFactory.class);
36 XPointer xpointer = null;
37
38
41 public XPointerFactory() {
42 Properties properties = new Properties ();
43 String propertiesFileName = "conf.properties";
44
45 try {
46 properties.load(XPointerFactory.class.getResourceAsStream(propertiesFileName));
47 } catch (Exception e) {
48 log.fatal(": Failed to load properties from resource: " + propertiesFileName);
49 }
50
51 String xpointerName = properties.getProperty("XPointer");
52
53 if (xpointerName == null) {
54 log.fatal(": No XPointer specified in " + propertiesFileName);
55 }
56
57 try {
58 Class xpointerClass = Class.forName(xpointerName);
59 xpointer = (XPointer) xpointerClass.newInstance();
60 } catch (Exception e) {
61 log.fatal(": " + e);
62 }
63 }
64
65
70 public static void main(String [] args) {
71 XPointerFactory xpf = new XPointerFactory();
72 DOMParserFactory dpf = new DOMParserFactory();
73
74 if (args.length != 2) {
75 System.err.println("Usage: java " + xpf.getClass().getName() +
76 " example.xml \"/Example/People/Person[1]/Name\"");
77
78 return;
79 }
80
81 Document document = null;
82
83 try {
84 document = dpf.getDocument(args[0]);
85 } catch (FileNotFoundException e) {
86 System.err.println("No such file or directory: " + e.getMessage());
87 } catch (Exception e) {
88 System.err.println(e.getMessage());
89 }
90
91 String xpath = args[1];
92
93 try {
94 Vector nodes = xpf.select(document.getDocumentElement(), "xpointer(" + xpath + ")");
95 String [] values = xpf.getNodeValues(nodes);
96
97 for (int i = 0; i < nodes.size(); i++) {
98 System.out.println(((Node ) nodes.elementAt(i)).getNodeName() + ": " + values[i]);
99 }
100 } catch (Exception e) {
101 System.err.println(xpf.getClass().getName() + ".main(): " + e);
102 }
103
104 Document doc = xpf.employees();
105
106 try {
107 Vector nodes = xpf.select(doc.getDocumentElement(), "xpointer(/Employees/Employee[2])");
108 String [] values = xpf.getNodeValues(nodes);
109
110 for (int i = 0; i < nodes.size(); i++) {
111 System.out.println(((Node ) nodes.elementAt(i)).getNodeName() + ": " + values[i]);
112 }
113
114 Element leviElement = (Element ) nodes.elementAt(0);
115 leviElement.appendChild(dpf.newTextNode(doc, " Brucker"));
116 } catch (Exception e) {
117 System.err.println(xpf.getClass().getName() + ".main(): " + e);
118 }
119
120 new DOMWriter(new PrintWriter (System.out)).print(doc);
121 System.out.println("");
122 }
123
124
131 public void parse(String reference, Vector xpaths, Vector namespaces) throws MalformedXPointerException {
132 tokenize(reference, xpaths, namespaces);
133 }
134
135
145 public Vector select(Node node, String reference) throws Exception {
146 Vector xpaths = new Vector ();
147 Vector namespaces = new Vector ();
148 parse(reference, xpaths, namespaces);
149
150 Vector nodes = new Vector ();
151
152 for (int i = 0; i < xpaths.size(); i++) {
153 Vector n = xpointer.select(node, (String ) xpaths.elementAt(i), namespaces);
154
155 for (int j = 0; j < n.size(); j++) {
156 nodes.addElement(n.elementAt(j));
157 }
158 }
159
160 return nodes;
161 }
162
163
173 public Node selectAt(Node node, String reference, int i) throws Exception {
174 return (Node )select(node, reference).elementAt(i);
175 }
176
177
185 public void tokenize(String xpointer, Vector xpaths, Vector namespaces) throws MalformedXPointerException {
186 if ((xpointer.indexOf("xpointer(") == 0) && (xpointer.charAt(xpointer.length() - 1) == ')')) {
187
188 String substring = xpointer.substring(9, xpointer.length());
189 int i = substring.indexOf(")");
190
191 if (i >= 0) {
192 log.debug("XPath: " + substring.substring(0, i));
193 xpaths.addElement(substring.substring(0, i));
194 tokenize(substring.substring(i + 1, substring.length()), xpaths, namespaces);
195 } else {
196 xpaths.addElement(substring.substring(0, substring.length() - 1));
197 return;
198 }
199 } else if ((xpointer.indexOf("xmlns(") == 0) && (xpointer.charAt(xpointer.length() - 1) == ')')) {
200 String substring = xpointer.substring(6, xpointer.length());
201 int i = substring.indexOf(")");
202
203 if (i >= 0) {
204 log.debug("Namespace: " + substring.substring(0, i));
205 namespaces.addElement(substring.substring(0, i));
206 tokenize(substring.substring(i + 1, substring.length()), xpaths, namespaces);
207 } else {
208 xpaths.addElement(substring.substring(0, substring.length() - 1));
209 return;
210 }
211 } else if (xpointer.equals("")) {
212 return;
213 } else {
214 throw new MalformedXPointerException(xpointer);
215 }
216 }
217
218
227 public String [] getNodeValues(Vector nodes) throws Exception {
228 String [] values = new String [nodes.size()];
229
230 for (int i = 0; i < values.length; i++) {
231 Node node = (Node ) nodes.elementAt(i);
232 short type = node.getNodeType();
233
234 switch (type) {
235 case Node.ELEMENT_NODE: {
236 values[i] = getElementValue((Element ) node);
237
238 break;
239 }
240
241 case Node.ATTRIBUTE_NODE: {
242 values[i] = node.getNodeValue();
243
244 break;
245 }
246
247 default:
248 values[i] = "";
249 throw new Exception ("Neither ELEMENT nor ATTRIBUTE: " + type);
250 }
251 }
252
253 return values;
254 }
255
256
263 public String getElementValue(Element element) {
264 String value = "";
265 NodeList nl = element.getChildNodes();
266
267 for (int k = 0; k < nl.getLength(); k++) {
268 short nodeType = nl.item(k).getNodeType();
269
270 if (nodeType == Node.TEXT_NODE) {
271 value = value + nl.item(k).getNodeValue();
272 } else if (nodeType == Node.ELEMENT_NODE) {
273 value = value + getElementValue((Element ) nl.item(k));
274 } else {
275 System.err.println("EXCEPTION: " + this.getClass().getName() +
276 ".getElementValue(): No TEXT_NODE");
277 }
278 }
279
280 return value;
281 }
282
283
289 public void getElementValue(Element element, Vector text) {
290 NodeList nl = element.getChildNodes();
291
292 for (int k = 0; k < nl.getLength(); k++) {
293 short nodeType = nl.item(k).getNodeType();
294
295 if (nodeType == Node.TEXT_NODE) {
296 text.addElement(nl.item(k).getNodeValue());
297 } else if (nodeType == Node.ELEMENT_NODE) {
298 getElementValue((Element ) nl.item(k), text);
299 } else {
300 System.err.println("EXCEPTION: " + this.getClass().getName() +
301 ".getElementValue(): No TEXT_NODE");
302 }
303 }
304 }
305
306
311 public Document employees() {
312 DOMParserFactory dpf = new DOMParserFactory();
313 Document doc = dpf.getDocument();
314 Element michi = dpf.newElementNode(doc, "Employee");
315 michi.setAttribute("Id", "0");
316 michi.appendChild(dpf.newTextNode(doc, "Michi"));
317
318 Element levi = dpf.newElementNode(doc, "Employee");
319 levi.setAttribute("Id", "1");
320 levi.appendChild(dpf.newTextNode(doc, "Levi"));
321
322 Element employees = dpf.newElementNode(doc, "Employees");
323 employees.appendChild(dpf.newTextNode(doc, "\n"));
324 employees.appendChild(michi);
325 employees.appendChild(dpf.newTextNode(doc, "\n"));
326 employees.appendChild(levi);
327 employees.appendChild(dpf.newTextNode(doc, "\n"));
328 doc.appendChild(employees);
329
330 return doc;
331 }
332 }
333 |
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