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1
18 package org.enhydra.snapper.business.xml;
19
20 import java.io.File  ;
22 import java.io.FileReader ;
23 import java.io.FileWriter ;
24 import java.io.InputStream ;
25 import java.io.InputStreamReader ;
26 import java.io.IOException ;
27 import java.io.OutputStream ;
28 import java.io.OutputStreamWriter ;
29 import java.io.Reader ;
30 import java.io.Writer ;
31 import java.util.HashMap ;
32 import java.util.Iterator ;
33 import java.util.Map ;
34 import org.xml.sax.EntityResolver ;
35 import org.xml.sax.ErrorHandler ;
36 import org.xml.sax.InputSource ;
37 import org.xml.sax.Locator ;
38 import org.xml.sax.SAXException ;
39 import org.xml.sax.SAXParseException ;
40 import org.xml.sax.XMLReader ;
41 import org.xml.sax.ext.LexicalHandler ;
42 import org.xml.sax.helpers.DefaultHandler ;
43 import org.xml.sax.helpers.XMLReaderFactory ;
44
45 public class ValueImpl extends DefaultHandler implements Cloneable , Unmarshallable, LexicalHandler , Value {
46
47 private String value;
48 private boolean zeus_ValueSet;
49
50
51 private String docTypeString;
52
53
54 private String outputEncoding;
55
56
57 private Unmarshallable zeus_currentUNode;
58
59
60 private Unmarshallable zeus_parentUNode;
61
62
63 private boolean zeus_thisNodeHandled = false;
64
65
66 private boolean hasDTD;
67
68
69 private boolean validate;
70
71
72 private Map namespaceMappings;
73
74
75 private static EntityResolver entityResolver;
76
77
78 private static ErrorHandler errorHandler;
79
80 private static ValueImpl prototype = null;
81
82 public static void setPrototype(ValueImpl prototype) {
83 ValueImpl.prototype = prototype;
84 }
85 public static ValueImpl newInstance() {
86 try {
87 return (prototype!=null)?(ValueImpl)prototype.clone(): new ValueImpl();
88 } catch (CloneNotSupportedException e) {
89 return null; }
91 }
92 public ValueImpl() {
93 zeus_ValueSet = false;
94 docTypeString = "";
95 hasDTD = false;
96 validate = false;
97 namespaceMappings = new HashMap ();
98 }
99
100 public String getValue() {
101 return value;
102 }
103
104 public void setValue(String value) {
105 this.value = value;
106 zeus_ValueSet = true;
107 }
108
109 public void setDocType(String name, String publicID, String systemID) {
110 try {
111 startDTD(name, publicID, systemID);
112 } catch (SAXException neverHappens) { }
113 }
114
115 public void setOutputEncoding(String outputEncoding) {
116 this.outputEncoding = outputEncoding;
117 }
118
119 public void marshal(File file) throws IOException {
120 marshal(new FileWriter (file));
122 }
123
124 public void marshal(OutputStream outputStream) throws IOException {
125 marshal(new OutputStreamWriter (outputStream));
127 }
128
129 public void marshal(Writer writer) throws IOException {
130 writer.write("<?xml version=\"1.0\" ");
132 if (outputEncoding != null) {
133 writer.write("encoding=\"");
134 writer.write(outputEncoding);
135 writer.write("\"?>\n\n");
136
137 } else {
138 writer.write("encoding=\"UTF-8\"?>\n\n");
139
140 }
141 writer.write(docTypeString);
143 writer.write("\n");
144 writeXMLRepresentation(writer, "");
146
147 writer.flush();
149 writer.close();
150 }
151
152 protected void writeXMLRepresentation(Writer writer,
153 String indent)
154 throws IOException {
155
156 writer.write(indent);
157 writer.write("<Value");
158
159 for (Iterator i = namespaceMappings.keySet().iterator(); i.hasNext(); ) {
161 String prefix = (String )i.next();
162 String uri = (String )namespaceMappings.get(prefix);
163 writer.write(" xmlns");
164 if (!prefix.trim().equals("")) {
165 writer.write(":");
166 writer.write(prefix);
167 }
168 writer.write("=\"");
169 writer.write(uri);
170 writer.write("\"\n ");
171 }
172
173 if (getValue() != null) {
175 writer.write(">");
177 writer.write(escapeTextValue(getValue()));
178 writer.write("</Value>\n");
179 } else {
180 writer.write("/>\n");
181 }
182 }
183
184 private String escapeAttributeValue(String attributeValue) {
185 String returnValue = attributeValue;
186 for (int i = 0; i < returnValue.length(); i++) {
187 char ch = returnValue.charAt(i);
188 if (ch == '"') {
189 returnValue = new StringBuffer ()
190 .append(returnValue.substring(0, i))
191 .append(""")
192 .append(returnValue.substring(i+1))
193 .toString();
194 }
195 }
196 return returnValue;
197 }
198
199 private String escapeTextValue(String textValue) {
200 String returnValue = textValue;
201 for (int i = 0; i < returnValue.length(); i++) {
202 char ch = returnValue.charAt(i);
203 if (ch == '<') {
204 returnValue = new StringBuffer ()
205 .append(returnValue.substring(0, i))
206 .append("<")
207 .append(returnValue.substring(i+1))
208 .toString();
209 } else if (ch == '>') {
210 returnValue = new StringBuffer ()
211 .append(returnValue.substring(0, i))
212 .append(">")
213 .append(returnValue.substring(i+1))
214 .toString();
215 }
216 }
217 return returnValue;
218 }
219
220
227 public static void setEntityResolver(EntityResolver resolver) {
228 entityResolver = resolver;
229 }
230
231
238 public static void setErrorHandler(ErrorHandler handler) {
239 errorHandler = handler;
240 }
241
242 public static Value unmarshal(File file) throws IOException {
243 return unmarshal(new FileReader (file));
245 }
246
247 public static Value unmarshal(File file, boolean validate) throws IOException {
248 return unmarshal(new FileReader (file), validate);
250 }
251
252 public static Value unmarshal(InputStream inputStream) throws IOException {
253 return unmarshal(new InputStreamReader (inputStream));
255 }
256
257 public static Value unmarshal(InputStream inputStream, boolean validate) throws IOException {
258 return unmarshal(new InputStreamReader (inputStream), validate);
260 }
261
262 public static Value unmarshal(Reader reader) throws IOException {
263 return unmarshal(reader, false);
265 }
266
267 public static Value unmarshal(Reader reader, boolean validate) throws IOException {
268 ValueImpl value = ValueImpl.newInstance();
269 value.setValidating(validate);
270 value.setCurrentUNode(value);
271 value.setParentUNode(null);
272 XMLReader parser = null;
274 String parserClass = System.getProperty("org.xml.sax.driver",
275 "org.apache.xerces.parsers.SAXParser");
276 try {
277 parser = XMLReaderFactory.createXMLReader(parserClass);
278
279 if (entityResolver != null) {
281 parser.setEntityResolver(entityResolver);
282 }
283
284 parser.setErrorHandler(value);
286
287 parser.setProperty("http://xml.org/sax/properties/lexical-handler", value);
289
290 parser.setContentHandler(value);
292 } catch (SAXException e) {
293 throw new IOException ("Could not load XML parser: " +
294 e.getMessage());
295 }
296
297 InputSource inputSource = new InputSource (reader);
298 try {
299 parser.setFeature("http://xml.org/sax/features/validation", new Boolean (validate).booleanValue());
300 parser.setFeature("http://xml.org/sax/features/namespaces", true);
301 parser.setFeature("http://xml.org/sax/features/namespace-prefixes", false);
302 parser.parse(inputSource);
303 } catch (SAXException e) {
304 throw new IOException ("Error parsing XML document: " +
305 e.getMessage());
306 }
307
308 return value;
310 }
311
312 public Unmarshallable getParentUNode() {
313 return zeus_parentUNode;
314 }
315
316 public void setParentUNode(Unmarshallable parentUNode) {
317 this.zeus_parentUNode = parentUNode;
318 }
319
320 public Unmarshallable getCurrentUNode() {
321 return zeus_currentUNode;
322 }
323
324 public void setCurrentUNode(Unmarshallable currentUNode) {
325 this.zeus_currentUNode = currentUNode;
326 }
327
328 public void setValidating(boolean validate) {
329 this.validate = validate;
330 }
331
332 public void startDocument() throws SAXException {
333 }
335
336 public void setDocumentLocator(Locator locator) {
337 }
339
340 public void startPrefixMapping(String prefix, String uri)
341 throws SAXException {
342 namespaceMappings.put(prefix, uri);
343 }
344
345 public void startElement(String namespaceURI, String localName,
346 String qName, org.xml.sax.Attributes atts)
347 throws SAXException {
348
349 Unmarshallable current = getCurrentUNode();
351 if (current != this) {
352 current.startElement(namespaceURI, localName, qName, atts);
353 return;
354 }
355
356 if ((localName.equals("Value")) && (!zeus_thisNodeHandled)) {
358 for (int i=0, len=atts.getLength(); i<len; i++) {
360 String attName= atts.getLocalName(i);
361 String attValue = atts.getValue(i);
362 }
363 zeus_thisNodeHandled = true;
364 return;
365 } else {
366 }
368 }
369
370 public void endElement(String namespaceURI, String localName,
371 String qName)
372 throws SAXException {
373
374 Unmarshallable current = getCurrentUNode();
375 if (current != this) {
376 current.endElement(namespaceURI, localName, qName);
377 return;
378 }
379
380 if (this.value == null) {
382 this.value = "";
383 }
384 Unmarshallable parent = getCurrentUNode().getParentUNode();
385 if (parent != null) {
386 parent.setCurrentUNode(parent);
387 }
388 }
389
390 public void characters(char[] ch, int start, int len)
391 throws SAXException {
392
393 Unmarshallable current = getCurrentUNode();
395 if (current != this) {
396 current.characters(ch, start, len);
397 return;
398 }
399
400 String text = new String (ch, start, len);
401 if (this.value == null) {
402 this.value = text;
403 } else {
404 this.value = new StringBuffer (this.value).append(text).toString();
405 }
406 }
407
408 public void comment(char ch[], int start, int len) throws SAXException {
409 }
411
412 public void warning(SAXParseException e) throws SAXException {
413 if (errorHandler != null) {
414 errorHandler.warning(e);
415 }
416 }
417
418 public void error(SAXParseException e) throws SAXException {
419 if ((validate) && (!hasDTD)) {
420 throw new SAXException ("Validation is turned on, but no DTD has been specified in the input XML document. Please supply a DTD through a DOCTYPE reference.");
421 }
422 if (errorHandler != null) {
423 errorHandler.error(e);
424 }
425 }
426
427 public void fatalError(SAXParseException e) throws SAXException {
428 if ((validate) && (!hasDTD)) {
429 throw new SAXException ("Validation is turned on, but no DTD has been specified in the input XML document. Please supply a DTD through a DOCTYPE reference.");
430 }
431 if (errorHandler != null) {
432 errorHandler.fatalError(e);
433 }
434 }
435
436 public void startDTD(String name, String publicID, String systemID)
437 throws SAXException {
438
439 if ((name == null) || (name.equals(""))) {
440 docTypeString = "";
441 return;
442 }
443
444 hasDTD = true;
445 StringBuffer docTypeSB = new StringBuffer ();
446 boolean hasPublic = false;
447
448 docTypeSB.append("<!DOCTYPE ")
449 .append(name);
450
451 if ((publicID != null) && (!publicID.equals(""))) {
452 docTypeSB.append(" PUBLIC \"")
453 .append(publicID)
454 .append("\"");
455 hasPublic = true;
456 }
457
458 if ((systemID != null) && (!systemID.equals(""))) {
459 if (!hasPublic) {
460 docTypeSB.append(" SYSTEM");
461 }
462 docTypeSB.append(" \"")
463 .append(systemID)
464 .append("\"");
465
466 }
467
468 docTypeSB.append(">");
469
470 docTypeString = docTypeSB.toString();
471 }
472
473 public void endDTD() throws SAXException {
474 }
476
477 public void startEntity(String name) throws SAXException {
478 }
480
481 public void endEntity(String name) throws SAXException {
482 }
484
485 public void startCDATA() throws SAXException {
486 }
488
489 public void endCDATA() throws SAXException {
490 }
492
493 }
494 |
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