Source Code Cross Referenced for StAXEventContentHandler.java in  » XML » stax-utils » javanet » staxutils » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » XML » stax utils » javanet.staxutils 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $Id: StAXEventContentHandler.java,v 1.5 2004/07/05 23:15:11 cniles Exp $
003:         * 
004:         * Copyright (c) 2004, Christian Niles, Unit12
005:         * All rights reserved.
006:         *
007:         * Redistribution and use in source and binary forms, with or without
008:         * modification, are permitted provided that the following conditions are met:
009:         * 
010:         *		*   Redistributions of source code must retain the above copyright
011:         *          notice, this list of conditions and the following disclaimer.
012:         * 
013:         *	    *	Redistributions in binary form must reproduce the above copyright
014:         *          notice, this list of conditions and the following disclaimer in the
015:         *          documentation and/or other materials provided with the distribution.
016:         * 
017:         *      *   Neither the name of Christian Niles, Unit12, nor the names of its
018:         *          contributors may be used to endorse or promote products derived from
019:         *          this software without specific prior written permission.
020:         *
021:         * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
022:         * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
023:         * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
024:         * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
025:         * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
026:         * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
027:         * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
028:         * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
029:         * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
030:         * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
031:         * POSSIBILITY OF SUCH DAMAGE.
032:         * 
033:         */
034:        package javanet.staxutils;
035:
036:        import java.util.ArrayList;
037:        import java.util.Collection;
038:        import java.util.Collections;
039:        import java.util.HashMap;
040:        import java.util.Iterator;
041:        import java.util.List;
042:        import java.util.Map;
043:
044:        import javax.xml.stream.XMLEventFactory;
045:        import javax.xml.stream.XMLStreamException;
046:        import javax.xml.stream.events.*;
047:        import javax.xml.stream.util.XMLEventConsumer;
048:
049:        import org.xml.sax.Attributes;
050:        import org.xml.sax.SAXException;
051:
052:        /**
053:         * SAX ContentHandler that writes events to a StAX {@link XMLEventConsumer}.
054:         * 
055:         * @author Christian Niles
056:         * @version $Revision: 1.5 $
057:         */
058:        public class StAXEventContentHandler extends StAXContentHandler {
059:
060:            /** The consumer to which events will be written. */
061:            private XMLEventConsumer consumer;
062:
063:            /** The factory used to construct events. */
064:            private XMLEventFactory eventFactory;
065:
066:            /**
067:             * A stack of {@link List}s, each containing {@link Namespace}events
068:             * constructed from a {@link StartElement}event. It is necessary to keep
069:             * these namespaces so we can report them to the {@link EndElement}event.
070:             */
071:            private List namespaceStack = new ArrayList();
072:
073:            /**
074:             * Constructs a default instance with a default event factory. You must set
075:             * the {@link XMLEventConsumer}via the
076:             * {@link #setEventConsumer(XMLEventConsumer)}method.
077:             */
078:            public StAXEventContentHandler() {
079:
080:                eventFactory = XMLEventFactory.newInstance();
081:
082:            }
083:
084:            /**
085:             * Constructs an instance that writes events to the provided
086:             * XMLEventConsumer. Events will be constructed from a default
087:             * XMLEventFactory instance.
088:             * 
089:             * @param consumer The {@link XMLEventConsumer}to which events will be
090:             *            written.
091:             */
092:            public StAXEventContentHandler(XMLEventConsumer consumer) {
093:
094:                this .consumer = consumer;
095:                eventFactory = XMLEventFactory.newInstance();
096:
097:            }
098:
099:            /**
100:             * Constructs an instance that writes events constructed with the provided
101:             * XMLEventFactory to the provided XMLEventConsumer
102:             * 
103:             * @param consumer The {@link XMLEventConsumer} to which events will be
104:             *            written.
105:             * @param factory The {@link XMLEventFactory} used to construct events. If
106:             *            <code>null</code>, a default instance will be constructed.
107:             */
108:            public StAXEventContentHandler(XMLEventConsumer consumer,
109:                    XMLEventFactory factory) {
110:
111:                this .consumer = consumer;
112:                if (factory != null) {
113:
114:                    this .eventFactory = factory;
115:
116:                } else {
117:
118:                    eventFactory = XMLEventFactory.newInstance();
119:
120:                }
121:
122:            }
123:
124:            /**
125:             * Returns a reference to the {@link XMLEventConsumer} to which events will
126:             * be written.
127:             * 
128:             * @return The {@link XMLEventConsumer} to which events will be written.
129:             */
130:            public XMLEventConsumer getEventConsumer() {
131:
132:                return consumer;
133:
134:            }
135:
136:            /**
137:             * Sets the {@link XMLEventConsumer} to which events are written.
138:             * 
139:             * @param consumer The {@link XMLEventConsumer} to which events will be
140:             *            written.
141:             */
142:            public void setEventConsumer(XMLEventConsumer consumer) {
143:
144:                this .consumer = consumer;
145:
146:            }
147:
148:            /**
149:             * Returns a reference to the {@link XMLEventFactory} used to construct
150:             * events.
151:             * 
152:             * @return The {@link XMLEventFactory} used to construct events.
153:             */
154:            public XMLEventFactory getEventFactory() {
155:
156:                return eventFactory;
157:
158:            }
159:
160:            /**
161:             * Sets the {@link XMLEventFactory} used to create events.
162:             * 
163:             * @param factory The {@link XMLEventFactory} used to create events.
164:             */
165:            public void setEventFactory(XMLEventFactory factory) {
166:
167:                this .eventFactory = factory;
168:
169:            }
170:
171:            public void startDocument() throws SAXException {
172:
173:                super .startDocument();
174:
175:                // clear the namespaces in case we ended in error before.
176:                namespaceStack.clear();
177:
178:                eventFactory.setLocation(getCurrentLocation());
179:                try {
180:
181:                    consumer.add(eventFactory.createStartDocument());
182:
183:                } catch (XMLStreamException e) {
184:
185:                    throw new SAXException(e);
186:
187:                }
188:
189:            }
190:
191:            public void endDocument() throws SAXException {
192:
193:                eventFactory.setLocation(getCurrentLocation());
194:
195:                try {
196:
197:                    consumer.add(eventFactory.createEndDocument());
198:
199:                } catch (XMLStreamException e) {
200:
201:                    throw new SAXException(e);
202:
203:                }
204:
205:                super .endDocument();
206:
207:                // clear the namespaces
208:                namespaceStack.clear();
209:
210:            }
211:
212:            public void startElement(String uri, String localName,
213:                    String qName, Attributes attributes) throws SAXException {
214:
215:                // set document location
216:                eventFactory.setLocation(getCurrentLocation());
217:
218:                // create attribute and namespace events
219:                Collection[] events = { null, null };
220:                createStartEvents(attributes, events);
221:
222:                // save a reference to the namespace collection so we can use them
223:                // again
224:                // in the end element
225:                namespaceStack.add(events[0]);
226:
227:                try {
228:
229:                    String[] qname = { null, null };
230:                    parseQName(qName, qname);
231:
232:                    consumer.add(eventFactory.createStartElement(qname[0], uri,
233:                            qname[1], events[1].iterator(), events[0]
234:                                    .iterator()));
235:
236:                } catch (XMLStreamException e) {
237:
238:                    throw new SAXException(e);
239:
240:                } finally {
241:
242:                    super .startElement(uri, localName, qName, attributes);
243:
244:                }
245:
246:            }
247:
248:            public void endElement(String uri, String localName, String qName)
249:                    throws SAXException {
250:
251:                super .endElement(uri, localName, qName);
252:
253:                eventFactory.setLocation(getCurrentLocation());
254:
255:                // parse name
256:                String[] qname = { null, null };
257:                parseQName(qName, qname);
258:
259:                // get namespaces
260:                Collection nsList = (Collection) namespaceStack
261:                        .remove(namespaceStack.size() - 1);
262:                Iterator nsIter = nsList.iterator();
263:
264:                try {
265:
266:                    consumer.add(eventFactory.createEndElement(qname[0], uri,
267:                            qname[1], nsIter));
268:
269:                } catch (XMLStreamException e) {
270:
271:                    throw new SAXException(e);
272:
273:                }
274:
275:            }
276:
277:            public void comment(char[] ch, int start, int length)
278:                    throws SAXException {
279:
280:                super .comment(ch, start, length);
281:
282:                eventFactory.setLocation(getCurrentLocation());
283:                try {
284:
285:                    consumer.add(eventFactory.createComment(new String(ch,
286:                            start, length)));
287:
288:                } catch (XMLStreamException e) {
289:
290:                    throw new SAXException(e);
291:
292:                }
293:
294:            }
295:
296:            public void characters(char[] ch, int start, int length)
297:                    throws SAXException {
298:
299:                super .characters(ch, start, length);
300:
301:                try {
302:
303:                    if (!isCDATA) {
304:
305:                        eventFactory.setLocation(getCurrentLocation());
306:                        consumer.add(eventFactory.createCharacters(new String(
307:                                ch, start, length)));
308:
309:                    }
310:
311:                } catch (XMLStreamException e) {
312:
313:                    throw new SAXException(e);
314:
315:                }
316:
317:            }
318:
319:            public void ignorableWhitespace(char[] ch, int start, int length)
320:                    throws SAXException {
321:
322:                super .ignorableWhitespace(ch, start, length);
323:                characters(ch, start, length);
324:
325:            }
326:
327:            public void processingInstruction(String target, String data)
328:                    throws SAXException {
329:
330:                super .processingInstruction(target, data);
331:                try {
332:
333:                    consumer.add(eventFactory.createProcessingInstruction(
334:                            target, data));
335:
336:                } catch (XMLStreamException e) {
337:
338:                    throw new SAXException(e);
339:
340:                }
341:
342:            }
343:
344:            public void endCDATA() throws SAXException {
345:
346:                eventFactory.setLocation(getCurrentLocation());
347:                try {
348:
349:                    consumer.add(eventFactory.createCData(CDATABuffer
350:                            .toString()));
351:
352:                } catch (XMLStreamException e) {
353:
354:                    throw new SAXException(e);
355:
356:                }
357:
358:                super .endCDATA();
359:
360:            }
361:
362:            /**
363:             * Creates the {@link Namespace}and {@link Attribute}events associated
364:             * with a {@link StartElement}.
365:             * 
366:             * @param attributes The SAX attributes object.
367:             * @param events An array used to return the two collections of
368:             *            {@link Namespace}and {@link Attribute}events. The
369:             *            namespaces will be placed at <code>events[0]</code> and the
370:             *            attributes as <code>events[1]</code>.
371:             */
372:            protected void createStartEvents(Attributes attributes,
373:                    Collection[] events) {
374:
375:                Map nsMap = null;
376:                List attrs = null;
377:
378:                // create namespaces
379:                if (namespaces != null) {
380:
381:                    Iterator prefixes = namespaces.getDeclaredPrefixes();
382:                    while (prefixes.hasNext()) {
383:
384:                        String prefix = (String) prefixes.next();
385:                        String uri = namespaces.getNamespaceURI(prefix);
386:
387:                        Namespace ns = createNamespace(prefix, uri);
388:                        if (nsMap == null) {
389:
390:                            nsMap = new HashMap();
391:
392:                        }
393:                        nsMap.put(prefix, ns);
394:
395:                    }
396:
397:                }
398:
399:                // create attributes
400:                String[] qname = { null, null };
401:                for (int i = 0, s = attributes.getLength(); i < s; i++) {
402:
403:                    parseQName(attributes.getQName(i), qname);
404:
405:                    String attrPrefix = qname[0];
406:                    String attrLocal = qname[1];
407:
408:                    String attrQName = attributes.getQName(i);
409:                    String attrValue = attributes.getValue(i);
410:                    String attrURI = attributes.getURI(i);
411:
412:                    if ("xmlns".equals(attrQName) || "xmlns".equals(attrPrefix)) {
413:
414:                        // namespace declaration disguised as an attribute. If the
415:                        // namespace has already been declared, skip it, otherwise
416:                        // write it as an namespace
417:
418:                        if (!nsMap.containsKey(attrPrefix)) {
419:
420:                            Namespace ns = createNamespace(attrPrefix,
421:                                    attrValue);
422:                            if (nsMap == null) {
423:
424:                                nsMap = new HashMap();
425:
426:                            }
427:                            nsMap.put(attrPrefix, ns);
428:
429:                        }
430:
431:                    } else {
432:
433:                        Attribute attribute;
434:                        if (attrPrefix.length() > 0) {
435:
436:                            attribute = eventFactory.createAttribute(
437:                                    attrPrefix, attrURI, attrLocal, attrValue);
438:
439:                        } else {
440:
441:                            attribute = eventFactory.createAttribute(attrLocal,
442:                                    attrValue);
443:
444:                        }
445:
446:                        if (attrs == null) {
447:
448:                            attrs = new ArrayList();
449:
450:                        }
451:                        attrs.add(attribute);
452:
453:                    }
454:
455:                }
456:
457:                events[0] = (nsMap == null ? Collections.EMPTY_LIST : nsMap
458:                        .values());
459:                events[1] = (attrs == null ? Collections.EMPTY_LIST : attrs);
460:
461:            }
462:
463:            protected Namespace createNamespace(String prefix, String uri) {
464:
465:                if (prefix == null || prefix.length() == 0) {
466:
467:                    return eventFactory.createNamespace(uri);
468:
469:                } else {
470:
471:                    return eventFactory.createNamespace(prefix, uri);
472:
473:                }
474:
475:            }
476:
477:        }
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