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Java Source Code / Java Documentation » 6.0 JDK Modules » jaxb impl » com.sun.xml.bind.v2.runtime.unmarshaller 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
003:         * 
004:         * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
005:         * 
006:         * The contents of this file are subject to the terms of either the GNU
007:         * General Public License Version 2 only ("GPL") or the Common Development
008:         * and Distribution License("CDDL") (collectively, the "License").  You
009:         * may not use this file except in compliance with the License. You can obtain
010:         * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
011:         * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
012:         * language governing permissions and limitations under the License.
013:         * 
014:         * When distributing the software, include this License Header Notice in each
015:         * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
016:         * Sun designates this particular file as subject to the "Classpath" exception
017:         * as provided by Sun in the GPL Version 2 section of the License file that
018:         * accompanied this code.  If applicable, add the following below the License
019:         * Header, with the fields enclosed by brackets [] replaced by your own
020:         * identifying information: "Portions Copyrighted [year]
021:         * [name of copyright owner]"
022:         * 
023:         * Contributor(s):
024:         * 
025:         * If you wish your version of this file to be governed by only the CDDL or
026:         * only the GPL Version 2, indicate your decision by adding "[Contributor]
027:         * elects to include this software in this distribution under the [CDDL or GPL
028:         * Version 2] license."  If you don't indicate a single choice of license, a
029:         * recipient has the option to distribute your version of this file under
030:         * either the CDDL, the GPL Version 2 or to extend the choice of license to
031:         * its licensees as provided above.  However, if you add GPL Version 2 code
032:         * and therefore, elected the GPL Version 2 license, then the option applies
033:         * only if the new code is made subject to such option by the copyright
034:         * holder.
035:         */
036:
037:        /* $Id: StAXStreamConnector.java,v 1.9.2.10 2007/05/31 21:59:57 ofung Exp $
038:         *
039:         * Copyright (c) 2004, Sun Microsystems, Inc.
040:         * All rights reserved.
041:         *
042:         * Redistribution and use in source and binary forms, with or without
043:         * modification, are permitted provided that the following conditions are
044:         * met:
045:         *
046:         *     * Redistributions of source code must retain the above copyright
047:         *      notice, this list of conditions and the following disclaimer.
048:         *
049:         *     * Redistributions in binary form must reproduce the above
050:         *      copyright notice, this list of conditions and the following
051:         *       disclaimer in the documentation and/or other materials provided
052:         *       with the distribution.
053:         *
054:         *     * Neither the name of Sun Microsystems, Inc. nor the names of its
055:         *       contributors may be used to endorse or promote products derived
056:         *       from this software without specific prior written permission.
057:         *
058:         * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
059:         * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
060:         * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
061:         * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
062:         * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
063:         * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
064:         * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
065:         * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
066:         * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
067:         * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
068:         * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
069:         */
070:        package com.sun.xml.bind.v2.runtime.unmarshaller;
071:
072:        import java.lang.reflect.Constructor;
073:
074:        import javax.xml.stream.Location;
075:        import javax.xml.stream.XMLStreamConstants;
076:        import javax.xml.stream.XMLStreamException;
077:        import javax.xml.stream.XMLStreamReader;
078:
079:        import com.sun.xml.bind.WhiteSpaceProcessor;
080:
081:        import org.xml.sax.Attributes;
082:        import org.xml.sax.SAXException;
083:
084:        /**
085:         * Reads XML from StAX {@link XMLStreamReader} and
086:         * feeds events to {@link XmlVisitor}.
087:         * <p>
088:         * TODO:
089:         * Finding the optimized FI implementations is a bit hacky and not very
090:         * extensible. Can we use the service provider mechnism in general for 
091:         * concrete implementations of StAXConnector.
092:         *
093:         * @author Ryan.Shoemaker@Sun.COM
094:         * @author Kohsuke Kawaguchi
095:         * @version JAXB 2.0
096:         */
097:        class StAXStreamConnector extends StAXConnector {
098:
099:            /**
100:             * Creates a {@link StAXConnector} from {@link XMLStreamReader}.
101:             *
102:             * This method checks if the parser is FI parser and acts accordingly.
103:             */
104:            public static StAXConnector create(XMLStreamReader reader,
105:                    XmlVisitor visitor) {
106:                // try optimized codepath
107:                final Class readerClass = reader.getClass();
108:                if (FI_STAX_READER_CLASS != null
109:                        && FI_STAX_READER_CLASS.isAssignableFrom(readerClass)
110:                        && FI_CONNECTOR_CTOR != null) {
111:                    try {
112:                        return FI_CONNECTOR_CTOR.newInstance(reader, visitor);
113:                    } catch (Exception t) {
114:                    }
115:                }
116:
117:                // Quick hack until SJSXP fixes 6270116
118:                boolean isZephyr = readerClass.getName().equals(
119:                        "com.sun.xml.stream.XMLReaderImpl");
120:                if (isZephyr)
121:                    ; // no need for interning
122:                else if (checkImplementaionNameOfSjsxp(reader))
123:                    ; // no need for interning
124:                else if (getBoolProp(reader, "org.codehaus.stax2.internNames")
125:                        && getBoolProp(reader,
126:                                "org.codehaus.stax2.internNsUris"))
127:                    ; // no need for interning.
128:                else
129:                    visitor = new InterningXmlVisitor(visitor);
130:
131:                if (STAX_EX_READER_CLASS != null
132:                        && STAX_EX_READER_CLASS.isAssignableFrom(readerClass)) {
133:                    try {
134:                        return STAX_EX_CONNECTOR_CTOR.newInstance(reader,
135:                                visitor);
136:                    } catch (Exception t) {
137:                    }
138:                }
139:
140:                return new StAXStreamConnector(reader, visitor);
141:            }
142:
143:            private static boolean checkImplementaionNameOfSjsxp(
144:                    XMLStreamReader reader) {
145:                try {
146:                    Object name = reader
147:                            .getProperty("http://java.sun.com/xml/stream/properties/implementation-name");
148:                    return name != null && name.equals("sjsxp");
149:                } catch (Exception e) {
150:                    // be defensive against broken StAX parsers since javadoc is not clear
151:                    // about when an error happens
152:                    return false;
153:                }
154:            }
155:
156:            private static boolean getBoolProp(XMLStreamReader r, String n) {
157:                try {
158:                    Object o = r.getProperty(n);
159:                    if (o instanceof  Boolean)
160:                        return (Boolean) o;
161:                    return false;
162:                } catch (Exception e) {
163:                    // be defensive against broken StAX parsers since javadoc is not clear
164:                    // about when an error happens
165:                    return false;
166:                }
167:            }
168:
169:            // StAX event source
170:            private final XMLStreamReader staxStreamReader;
171:
172:            /**
173:             * SAX may fire consective characters event, but we don't allow it.
174:             * so use this buffer to perform buffering.
175:             */
176:            protected final StringBuilder buffer = new StringBuilder();
177:
178:            /**
179:             * Set to true if the text() event is reported, and therefore
180:             * the following text() event should be suppressed.
181:             */
182:            protected boolean textReported = false;
183:
184:            protected StAXStreamConnector(XMLStreamReader staxStreamReader,
185:                    XmlVisitor visitor) {
186:                super (visitor);
187:                this .staxStreamReader = staxStreamReader;
188:            }
189:
190:            public void bridge() throws XMLStreamException {
191:
192:                try {
193:                    // remembers the nest level of elements to know when we are done.
194:                    int depth = 0;
195:
196:                    // if the parser is at the start tag, proceed to the first element
197:                    int event = staxStreamReader.getEventType();
198:                    if (event == XMLStreamConstants.START_DOCUMENT) {
199:                        // nextTag doesn't correctly handle DTDs
200:                        while (!staxStreamReader.isStartElement())
201:                            event = staxStreamReader.next();
202:                    }
203:
204:                    if (event != XMLStreamConstants.START_ELEMENT)
205:                        throw new IllegalStateException(
206:                                "The current event is not START_ELEMENT\n but "
207:                                        + event);
208:
209:                    handleStartDocument(staxStreamReader.getNamespaceContext());
210:
211:                    OUTER: while (true) {
212:                        // These are all of the events listed in the javadoc for
213:                        // XMLEvent.
214:                        // The spec only really describes 11 of them.
215:                        switch (event) {
216:                        case XMLStreamConstants.START_ELEMENT:
217:                            handleStartElement();
218:                            depth++;
219:                            break;
220:                        case XMLStreamConstants.END_ELEMENT:
221:                            depth--;
222:                            handleEndElement();
223:                            if (depth == 0)
224:                                break OUTER;
225:                            break;
226:                        case XMLStreamConstants.CHARACTERS:
227:                        case XMLStreamConstants.CDATA:
228:                        case XMLStreamConstants.SPACE:
229:                            handleCharacters();
230:                            break;
231:                        // otherwise simply ignore
232:                        }
233:
234:                        event = staxStreamReader.next();
235:                    }
236:
237:                    staxStreamReader.next(); // move beyond the end tag.
238:
239:                    handleEndDocument();
240:                } catch (SAXException e) {
241:                    throw new XMLStreamException(e);
242:                }
243:            }
244:
245:            protected Location getCurrentLocation() {
246:                return staxStreamReader.getLocation();
247:            }
248:
249:            protected String getCurrentQName() {
250:                return getQName(staxStreamReader.getPrefix(), staxStreamReader
251:                        .getLocalName());
252:            }
253:
254:            private void handleEndElement() throws SAXException {
255:                processText(false);
256:
257:                // fire endElement
258:                tagName.uri = fixNull(staxStreamReader.getNamespaceURI());
259:                tagName.local = staxStreamReader.getLocalName();
260:                visitor.endElement(tagName);
261:
262:                // end namespace bindings
263:                int nsCount = staxStreamReader.getNamespaceCount();
264:                for (int i = nsCount - 1; i >= 0; i--) {
265:                    visitor.endPrefixMapping(fixNull(staxStreamReader
266:                            .getNamespacePrefix(i)));
267:                }
268:            }
269:
270:            private void handleStartElement() throws SAXException {
271:                processText(true);
272:
273:                // start namespace bindings
274:                int nsCount = staxStreamReader.getNamespaceCount();
275:                for (int i = 0; i < nsCount; i++) {
276:                    visitor.startPrefixMapping(fixNull(staxStreamReader
277:                            .getNamespacePrefix(i)), fixNull(staxStreamReader
278:                            .getNamespaceURI(i)));
279:                }
280:
281:                // fire startElement
282:                tagName.uri = fixNull(staxStreamReader.getNamespaceURI());
283:                tagName.local = staxStreamReader.getLocalName();
284:                tagName.atts = attributes;
285:
286:                visitor.startElement(tagName);
287:            }
288:
289:            /**
290:             * Proxy of {@link Attributes} that read from {@link XMLStreamReader}.
291:             */
292:            private final Attributes attributes = new Attributes() {
293:                public int getLength() {
294:                    return staxStreamReader.getAttributeCount();
295:                }
296:
297:                public String getURI(int index) {
298:                    String uri = staxStreamReader.getAttributeNamespace(index);
299:                    if (uri == null)
300:                        return "";
301:                    return uri;
302:                }
303:
304:                public String getLocalName(int index) {
305:                    return staxStreamReader.getAttributeLocalName(index);
306:                }
307:
308:                public String getQName(int index) {
309:                    String prefix = staxStreamReader.getAttributePrefix(index);
310:                    if (prefix == null || prefix.length() == 0)
311:                        return getLocalName(index);
312:                    else
313:                        return prefix + ':' + getLocalName(index);
314:                }
315:
316:                public String getType(int index) {
317:                    return staxStreamReader.getAttributeType(index);
318:                }
319:
320:                public String getValue(int index) {
321:                    return staxStreamReader.getAttributeValue(index);
322:                }
323:
324:                public int getIndex(String uri, String localName) {
325:                    for (int i = getLength() - 1; i >= 0; i--)
326:                        if (localName.equals(getLocalName(i))
327:                                && uri.equals(getURI(i)))
328:                            return i;
329:                    return -1;
330:                }
331:
332:                // this method sholdn't be used that often (if at all)
333:                // so it's OK to be slow.
334:                public int getIndex(String qName) {
335:                    for (int i = getLength() - 1; i >= 0; i--) {
336:                        if (qName.equals(getQName(i)))
337:                            return i;
338:                    }
339:                    return -1;
340:                }
341:
342:                public String getType(String uri, String localName) {
343:                    int index = getIndex(uri, localName);
344:                    if (index < 0)
345:                        return null;
346:                    return getType(index);
347:                }
348:
349:                public String getType(String qName) {
350:                    int index = getIndex(qName);
351:                    if (index < 0)
352:                        return null;
353:                    return getType(index);
354:                }
355:
356:                public String getValue(String uri, String localName) {
357:                    int index = getIndex(uri, localName);
358:                    if (index < 0)
359:                        return null;
360:                    return getValue(index);
361:                }
362:
363:                public String getValue(String qName) {
364:                    int index = getIndex(qName);
365:                    if (index < 0)
366:                        return null;
367:                    return getValue(index);
368:                }
369:            };
370:
371:            protected void handleCharacters() throws XMLStreamException,
372:                    SAXException {
373:                if (predictor.expectText())
374:                    buffer.append(staxStreamReader.getTextCharacters(),
375:                            staxStreamReader.getTextStart(), staxStreamReader
376:                                    .getTextLength());
377:            }
378:
379:            private void processText(boolean ignorable) throws SAXException {
380:                if (predictor.expectText()
381:                        && (!ignorable || !WhiteSpaceProcessor
382:                                .isWhiteSpace(buffer))) {
383:                    if (textReported) {
384:                        textReported = false;
385:                    } else {
386:                        visitor.text(buffer);
387:                    }
388:                }
389:                buffer.setLength(0);
390:            }
391:
392:            /**
393:             * Reference to FI's StAXReader class, if FI can be loaded.
394:             */
395:            private static final Class FI_STAX_READER_CLASS = initFIStAXReaderClass();
396:            private static final Constructor<? extends StAXConnector> FI_CONNECTOR_CTOR = initFastInfosetConnectorClass();
397:
398:            private static Class initFIStAXReaderClass() {
399:                try {
400:                    Class fisr = UnmarshallerImpl.class
401:                            .getClassLoader()
402:                            .loadClass(
403:                                    "org.jvnet.fastinfoset.stax.FastInfosetStreamReader");
404:                    Class sdp = UnmarshallerImpl.class
405:                            .getClassLoader()
406:                            .loadClass(
407:                                    "com.sun.xml.fastinfoset.stax.StAXDocumentParser");
408:                    // Check if StAXDocumentParser implements FastInfosetStreamReader
409:                    if (fisr.isAssignableFrom(sdp))
410:                        return sdp;
411:                    else
412:                        return null;
413:                } catch (Throwable e) {
414:                    return null;
415:                }
416:            }
417:
418:            private static Constructor<? extends StAXConnector> initFastInfosetConnectorClass() {
419:                try {
420:                    if (FI_STAX_READER_CLASS == null)
421:                        return null;
422:
423:                    Class c = UnmarshallerImpl.class
424:                            .getClassLoader()
425:                            .loadClass(
426:                                    "com.sun.xml.bind.v2.runtime.unmarshaller.FastInfosetConnector");
427:                    return c.getConstructor(FI_STAX_READER_CLASS,
428:                            XmlVisitor.class);
429:                } catch (Throwable e) {
430:                    return null;
431:                }
432:            }
433:
434:            //
435:            // reference to StAXEx classes
436:            //
437:            private static final Class STAX_EX_READER_CLASS = initStAXExReader();
438:            private static final Constructor<? extends StAXConnector> STAX_EX_CONNECTOR_CTOR = initStAXExConnector();
439:
440:            private static Class initStAXExReader() {
441:                try {
442:                    return UnmarshallerImpl.class.getClassLoader().loadClass(
443:                            "org.jvnet.staxex.XMLStreamReaderEx");
444:                } catch (Throwable e) {
445:                    return null;
446:                }
447:            }
448:
449:            private static Constructor<? extends StAXConnector> initStAXExConnector() {
450:                try {
451:                    Class c = UnmarshallerImpl.class
452:                            .getClassLoader()
453:                            .loadClass(
454:                                    "com.sun.xml.bind.v2.runtime.unmarshaller.StAXExConnector");
455:                    return c.getConstructor(STAX_EX_READER_CLASS,
456:                            XmlVisitor.class);
457:                } catch (Throwable e) {
458:                    return null;
459:                }
460:            }
461:        }
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