Source Code Cross Referenced for XMLEventReaderToContentHandler.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:        /* $Id: XMLEventReaderToContentHandler.java,v 1.10 2006/01/23 18:50:02 sandoz Exp $
002:         *
003:         * Copyright (c) 2004, Sun Microsystems, Inc.
004:         * All rights reserved.
005:         *
006:         * Redistribution and use in source and binary forms, with or without
007:         * modification, are permitted provided that the following conditions are
008:         * 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
014:         *      copyright notice, this list of conditions and the following
015:         *       disclaimer in the documentation and/or other materials provided
016:         *       with the distribution.
017:         *
018:         *     * Neither the name of Sun Microsystems, Inc. nor the names of its
019:         *       contributors may be used to endorse or promote products derived
020:         *       from this software without specific prior written permission.
021:         *
022:         * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
023:         * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
024:         * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
025:         * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
026:         * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
027:         * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
028:         * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
029:         * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
030:         * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
031:         * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
032:         * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
033:         */
034:        package javanet.staxutils;
035:
036:        import java.util.Iterator;
037:        import javanet.staxutils.helpers.XMLFilterImplEx;
038:
039:        import javax.xml.namespace.QName;
040:        import javax.xml.stream.XMLEventReader;
041:        import javax.xml.stream.XMLStreamConstants;
042:        import javax.xml.stream.XMLStreamException;
043:        import javax.xml.stream.Location;
044:        import javax.xml.stream.events.Attribute;
045:        import javax.xml.stream.events.Characters;
046:        import javax.xml.stream.events.Comment;
047:        import javax.xml.stream.events.EndElement;
048:        import javax.xml.stream.events.Namespace;
049:        import javax.xml.stream.events.ProcessingInstruction;
050:        import javax.xml.stream.events.StartElement;
051:        import javax.xml.stream.events.XMLEvent;
052:
053:        import org.xml.sax.Attributes;
054:        import org.xml.sax.Locator;
055:        import org.xml.sax.SAXException;
056:        import org.xml.sax.helpers.AttributesImpl;
057:
058:        /**
059:         * This is a simple utility class that adapts StAX events from an
060:         * {@link javax.xml.stream.XMLEventReader} to SAX events on a
061:         * {@link org.xml.sax.ContentHandler}, bridging between the two
062:         * parser technologies.
063:         *
064:         * @author Ryan.Shoemaker@Sun.COM
065:         * @version 1.0
066:         */
067:        public class XMLEventReaderToContentHandler implements 
068:                StAXReaderToContentHandler {
069:
070:            // StAX event source
071:            private final XMLEventReader staxEventReader;
072:
073:            // SAX event sinks
074:            private XMLFilterImplEx filter;
075:
076:            /**
077:             * Construct a new StAX to SAX adapter that will convert a StAX event
078:             * stream into a SAX event stream.
079:             * 
080:             * @param staxCore
081:             *                StAX event source
082:             * @param filter
083:             *                SAX event sink
084:             */
085:            public XMLEventReaderToContentHandler(XMLEventReader staxCore,
086:                    XMLFilterImplEx filter) {
087:                staxEventReader = staxCore;
088:
089:                this .filter = filter;
090:            }
091:
092:            /*
093:             * @see StAXReaderToContentHandler#bridge()
094:             */
095:            public void bridge() throws XMLStreamException {
096:
097:                try {
098:                    // remembers the nest level of elements to know when we are done.
099:                    int depth = 0;
100:
101:                    XMLEvent event = staxEventReader.peek();
102:
103:                    boolean readWhole = false;
104:
105:                    if (event.isStartDocument()) {
106:                        readWhole = true;
107:                    } else if (!event.isStartElement())
108:                        throw new IllegalStateException();
109:
110:                    // if the parser is on START_DOCUMENT, skip ahead to the first element
111:                    do {
112:                        event = staxEventReader.nextEvent();
113:                    } while (!event.isStartElement());
114:
115:                    handleStartDocument(event);
116:
117:                    OUTER: while (true) {
118:                        // These are all of the events listed in the javadoc for
119:                        // XMLEvent.
120:                        // The spec only really describes 11 of them.
121:                        switch (event.getEventType()) {
122:                        case XMLStreamConstants.START_ELEMENT:
123:                            depth++;
124:                            handleStartElement(event.asStartElement());
125:                            break;
126:                        case XMLStreamConstants.END_ELEMENT:
127:                            handleEndElement(event.asEndElement());
128:                            depth--;
129:                            if (depth == 0)
130:                                break OUTER;
131:                            break;
132:                        case XMLStreamConstants.CHARACTERS:
133:                            handleCharacters(event.asCharacters());
134:                            break;
135:                        case XMLStreamConstants.ENTITY_REFERENCE:
136:                            handleEntityReference();
137:                            break;
138:                        case XMLStreamConstants.PROCESSING_INSTRUCTION:
139:                            handlePI((ProcessingInstruction) event);
140:                            break;
141:                        case XMLStreamConstants.COMMENT:
142:                            handleComment((Comment) event);
143:                            break;
144:                        case XMLStreamConstants.DTD:
145:                            handleDTD();
146:                            break;
147:                        case XMLStreamConstants.ATTRIBUTE:
148:                            handleAttribute();
149:                            break;
150:                        case XMLStreamConstants.NAMESPACE:
151:                            handleNamespace();
152:                            break;
153:                        case XMLStreamConstants.CDATA:
154:                            handleCDATA();
155:                            break;
156:                        case XMLStreamConstants.ENTITY_DECLARATION:
157:                            handleEntityDecl();
158:                            break;
159:                        case XMLStreamConstants.NOTATION_DECLARATION:
160:                            handleNotationDecl();
161:                            break;
162:                        case XMLStreamConstants.SPACE:
163:                            handleSpace();
164:                            break;
165:                        default:
166:                            throw new InternalError("processing event: "
167:                                    + event);
168:                        }
169:
170:                        event = staxEventReader.nextEvent();
171:                    }
172:
173:                    handleEndDocument();
174:
175:                    if (readWhole) {
176:                        // if we started from START_DOCUMENT, read the whole document
177:                        while (staxEventReader.hasNext())
178:                            staxEventReader.nextEvent();
179:                    }
180:                } catch (SAXException e) {
181:                    throw new XMLStreamException(e);
182:                }
183:            }
184:
185:            private void handleEndDocument() throws SAXException {
186:                filter.endDocument();
187:            }
188:
189:            private void handleStartDocument(final XMLEvent event)
190:                    throws SAXException {
191:                final Location location = event.getLocation();
192:                if (location != null) {
193:                    filter.setDocumentLocator(new Locator() {
194:                        public int getColumnNumber() {
195:                            return location.getColumnNumber();
196:                        }
197:
198:                        public int getLineNumber() {
199:                            return location.getLineNumber();
200:                        }
201:
202:                        public String getPublicId() {
203:                            return location.getPublicId();
204:                        }
205:
206:                        public String getSystemId() {
207:                            return location.getSystemId();
208:                        }
209:                    });
210:                } else {
211:                    filter.setDocumentLocator(new DummyLocator());
212:                }
213:                filter.startDocument();
214:            }
215:
216:            private void handlePI(ProcessingInstruction event)
217:                    throws XMLStreamException {
218:                try {
219:                    filter.processingInstruction(event.getTarget(), event
220:                            .getData());
221:                } catch (SAXException e) {
222:                    throw new XMLStreamException(e);
223:                }
224:            }
225:
226:            private void handleCharacters(Characters event)
227:                    throws XMLStreamException {
228:                try {
229:                    filter.characters(event.getData().toCharArray(), 0, event
230:                            .getData().length());
231:                } catch (SAXException e) {
232:                    throw new XMLStreamException(e);
233:                }
234:            }
235:
236:            private void handleEndElement(EndElement event)
237:                    throws XMLStreamException {
238:                QName qName = event.getName();
239:
240:                try {
241:                    // fire endElement
242:                    String prefix = qName.getPrefix();
243:                    String rawname;
244:                    if (prefix == null || prefix.length() == 0)
245:                        rawname = qName.getLocalPart();
246:                    else
247:                        rawname = prefix + ':' + qName.getLocalPart();
248:
249:                    filter.endElement(qName.getNamespaceURI(), qName
250:                            .getLocalPart(), rawname);
251:
252:                    // end namespace bindings
253:                    for (Iterator i = event.getNamespaces(); i.hasNext();) {
254:                        String nsprefix = ((Namespace) i.next()).getPrefix();
255:                        if (nsprefix == null) { // true for default namespace
256:                            nsprefix = "";
257:                        }
258:                        filter.endPrefixMapping(nsprefix);
259:                    }
260:                } catch (SAXException e) {
261:                    throw new XMLStreamException(e);
262:                }
263:            }
264:
265:            private void handleStartElement(StartElement event)
266:                    throws XMLStreamException {
267:                try {
268:                    // start namespace bindings
269:                    for (Iterator i = event.getNamespaces(); i.hasNext();) {
270:                        String prefix = ((Namespace) i.next()).getPrefix();
271:                        if (prefix == null) { // true for default namespace
272:                            prefix = "";
273:                        }
274:                        filter.startPrefixMapping(prefix, event
275:                                .getNamespaceURI(prefix));
276:                    }
277:
278:                    // fire startElement
279:                    QName qName = event.getName();
280:                    String prefix = qName.getPrefix();
281:                    String rawname;
282:                    if (prefix == null || prefix.length() == 0)
283:                        rawname = qName.getLocalPart();
284:                    else
285:                        rawname = prefix + ':' + qName.getLocalPart();
286:                    Attributes saxAttrs = getAttributes(event);
287:                    filter.startElement(qName.getNamespaceURI(), qName
288:                            .getLocalPart(), rawname, saxAttrs);
289:                } catch (SAXException e) {
290:                    throw new XMLStreamException(e);
291:                }
292:            }
293:
294:            /**
295:             * Get the attributes associated with the given START_ELEMENT StAXevent.
296:             *
297:             * @return the StAX attributes converted to an org.xml.sax.Attributes
298:             */
299:            private Attributes getAttributes(StartElement event) {
300:                AttributesImpl attrs = new AttributesImpl();
301:
302:                if (!event.isStartElement()) {
303:                    throw new InternalError(
304:                            "getAttributes() attempting to process: " + event);
305:                }
306:
307:                // Add namspace declarations if required
308:                if (filter.getNamespacePrefixes()) {
309:                    for (Iterator i = event.getNamespaces(); i.hasNext();) {
310:                        Namespace staxNamespace = (javax.xml.stream.events.Namespace) i
311:                                .next();
312:                        String uri = staxNamespace.getNamespaceURI();
313:                        if (uri == null)
314:                            uri = "";
315:
316:                        String prefix = staxNamespace.getPrefix();
317:                        if (prefix == null)
318:                            prefix = "";
319:
320:                        String qName = "xmlns";
321:                        if (prefix.length() == 0) {
322:                            prefix = qName;
323:                        } else {
324:                            qName = qName + ':' + prefix;
325:                        }
326:                        attrs.addAttribute("http://www.w3.org/2000/xmlns/",
327:                                prefix, qName, "CDATA", uri);
328:                    }
329:                }
330:
331:                // gather non-namespace attrs
332:                for (Iterator i = event.getAttributes(); i.hasNext();) {
333:                    Attribute staxAttr = (javax.xml.stream.events.Attribute) i
334:                            .next();
335:
336:                    String uri = staxAttr.getName().getNamespaceURI();
337:                    if (uri == null)
338:                        uri = "";
339:                    String localName = staxAttr.getName().getLocalPart();
340:                    String prefix = staxAttr.getName().getPrefix();
341:                    String qName;
342:                    if (prefix == null || prefix.length() == 0)
343:                        qName = localName;
344:                    else
345:                        qName = prefix + ':' + localName;
346:                    String type = staxAttr.getDTDType();
347:                    String value = staxAttr.getValue();
348:
349:                    attrs.addAttribute(uri, localName, qName, type, value);
350:                }
351:
352:                return attrs;
353:            }
354:
355:            private void handleNamespace() {
356:                // no-op ???
357:                // namespace events don't normally occur outside of a startElement
358:                // or endElement
359:            }
360:
361:            private void handleAttribute() {
362:                // no-op ???
363:                // attribute events don't normally occur outside of a startElement
364:                // or endElement
365:            }
366:
367:            private void handleDTD() {
368:                // no-op ???
369:                // it seems like we need to pass this info along, but how?
370:            }
371:
372:            private void handleComment(Comment comment)
373:                    throws XMLStreamException {
374:                try {
375:                    String text = comment.getText();
376:                    filter.comment(text.toCharArray(), 0, text.length());
377:                } catch (SAXException e) {
378:                    throw new XMLStreamException(e);
379:                }
380:            }
381:
382:            private void handleEntityReference() {
383:                // no-op ???
384:            }
385:
386:            private void handleSpace() {
387:                // no-op ???
388:                // this event is listed in the javadoc, but not in the spec.
389:            }
390:
391:            private void handleNotationDecl() {
392:                // no-op ???
393:                // this event is listed in the javadoc, but not in the spec.
394:            }
395:
396:            private void handleEntityDecl() {
397:                // no-op ???
398:                // this event is listed in the javadoc, but not in the spec.
399:            }
400:
401:            private void handleCDATA() {
402:                // no-op ???
403:                // this event is listed in the javadoc, but not in the spec.
404:            }
405:        }
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