Source Code Cross Referenced for StAXEventConnector.java in  » 6.0-JDK-Modules » jaxb-impl » com » sun » xml » bind » v2 » runtime » unmarshaller » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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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: StAXEventConnector.java,v 1.6.2.1 2007/05/31 21:59:56 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.util.Iterator;
073:
074:        import javax.xml.namespace.QName;
075:        import javax.xml.stream.Location;
076:        import javax.xml.stream.XMLEventReader;
077:        import javax.xml.stream.XMLStreamConstants;
078:        import javax.xml.stream.XMLStreamException;
079:        import javax.xml.stream.events.Attribute;
080:        import javax.xml.stream.events.Characters;
081:        import javax.xml.stream.events.EndElement;
082:        import javax.xml.stream.events.Namespace;
083:        import javax.xml.stream.events.StartElement;
084:        import javax.xml.stream.events.XMLEvent;
085:
086:        import org.xml.sax.Attributes;
087:        import org.xml.sax.SAXException;
088:        import org.xml.sax.helpers.AttributesImpl;
089:
090:        /**
091:         * This is a simple utility class that adapts StAX events from an
092:         * {@link XMLEventReader} to unmarshaller events on a
093:         * {@link XmlVisitor}, bridging between the two
094:         * parser technologies.
095:         *
096:         * @author Ryan.Shoemaker@Sun.COM
097:         * @version 1.0
098:         */
099:        final class StAXEventConnector extends StAXConnector {
100:
101:            // StAX event source
102:            private final XMLEventReader staxEventReader;
103:
104:            /** Current event. */
105:            private XMLEvent event;
106:
107:            /**
108:             * Shared and reused {@link Attributes}.
109:             */
110:            private final AttributesImpl attrs = new AttributesImpl();
111:
112:            /**
113:             * SAX may fire consective characters event, but we don't allow it.
114:             * so use this buffer to perform buffering.
115:             */
116:            private final StringBuilder buffer = new StringBuilder();
117:
118:            private boolean seenText;
119:
120:            /**
121:             * Construct a new StAX to SAX adapter that will convert a StAX event
122:             * stream into a SAX event stream.
123:             * 
124:             * @param staxCore
125:             *                StAX event source
126:             * @param visitor
127:             *                sink
128:             */
129:            public StAXEventConnector(XMLEventReader staxCore,
130:                    XmlVisitor visitor) {
131:                super (visitor);
132:                staxEventReader = staxCore;
133:            }
134:
135:            public void bridge() throws XMLStreamException {
136:
137:                try {
138:                    // remembers the nest level of elements to know when we are done.
139:                    int depth = 0;
140:
141:                    event = staxEventReader.peek();
142:
143:                    if (!event.isStartDocument() && !event.isStartElement())
144:                        throw new IllegalStateException();
145:
146:                    // if the parser is on START_DOCUMENT, skip ahead to the first element
147:                    do {
148:                        event = staxEventReader.nextEvent();
149:                    } while (!event.isStartElement());
150:
151:                    handleStartDocument(event.asStartElement()
152:                            .getNamespaceContext());
153:
154:                    OUTER: while (true) {
155:                        // These are all of the events listed in the javadoc for
156:                        // XMLEvent.
157:                        // The spec only really describes 11 of them.
158:                        switch (event.getEventType()) {
159:                        case XMLStreamConstants.START_ELEMENT:
160:                            handleStartElement(event.asStartElement());
161:                            depth++;
162:                            break;
163:                        case XMLStreamConstants.END_ELEMENT:
164:                            depth--;
165:                            handleEndElement(event.asEndElement());
166:                            if (depth == 0)
167:                                break OUTER;
168:                            break;
169:                        case XMLStreamConstants.CHARACTERS:
170:                        case XMLStreamConstants.CDATA:
171:                        case XMLStreamConstants.SPACE:
172:                            handleCharacters(event.asCharacters());
173:                            break;
174:                        }
175:
176:                        event = staxEventReader.nextEvent();
177:                    }
178:
179:                    handleEndDocument();
180:                    event = null; // avoid keeping a stale reference
181:                } catch (SAXException e) {
182:                    throw new XMLStreamException(e);
183:                }
184:            }
185:
186:            protected Location getCurrentLocation() {
187:                return event.getLocation();
188:            }
189:
190:            protected String getCurrentQName() {
191:                QName qName;
192:                if (event.isEndElement())
193:                    qName = event.asEndElement().getName();
194:                else
195:                    qName = event.asStartElement().getName();
196:                return getQName(qName.getPrefix(), qName.getLocalPart());
197:            }
198:
199:            private void handleCharacters(Characters event)
200:                    throws SAXException, XMLStreamException {
201:                if (!predictor.expectText())
202:                    return; // text isn't expected. simply skip
203:
204:                seenText = true;
205:
206:                // check the next event
207:                XMLEvent next;
208:                while (true) {
209:                    next = staxEventReader.peek();
210:                    if (!isIgnorable(next))
211:                        break;
212:                    staxEventReader.nextEvent();
213:                }
214:
215:                if (isTag(next)) {
216:                    // this is by far the common case --- you have <foo>abc</foo> or <foo>abc<bar/>...</foo>
217:                    visitor.text(event.getData());
218:                    return;
219:                }
220:
221:                // otherwise we have things like "abc<!-- test -->def".
222:                // concatenate all text
223:                buffer.append(event.getData());
224:
225:                while (true) {
226:                    while (true) {
227:                        next = staxEventReader.peek();
228:                        if (!isIgnorable(next))
229:                            break;
230:                        staxEventReader.nextEvent();
231:                    }
232:
233:                    if (isTag(next)) {
234:                        // found all adjacent text
235:                        visitor.text(buffer);
236:                        buffer.setLength(0);
237:                        return;
238:                    }
239:
240:                    buffer.append(next.asCharacters().getData());
241:                    staxEventReader.nextEvent(); // consume
242:                }
243:            }
244:
245:            private boolean isTag(XMLEvent event) {
246:                int eventType = event.getEventType();
247:                return eventType == XMLEvent.START_ELEMENT
248:                        || eventType == XMLEvent.END_ELEMENT;
249:            }
250:
251:            private boolean isIgnorable(XMLEvent event) {
252:                int eventType = event.getEventType();
253:                return eventType == XMLEvent.COMMENT
254:                        || eventType == XMLEvent.PROCESSING_INSTRUCTION;
255:            }
256:
257:            private void handleEndElement(EndElement event) throws SAXException {
258:                if (!seenText && predictor.expectText()) {
259:                    visitor.text("");
260:                }
261:
262:                // fire endElement
263:                QName qName = event.getName();
264:                tagName.uri = fixNull(qName.getNamespaceURI());
265:                tagName.local = qName.getLocalPart();
266:                visitor.endElement(tagName);
267:
268:                // end namespace bindings
269:                for (Iterator<Namespace> i = event.getNamespaces(); i.hasNext();) {
270:                    String prefix = fixNull(i.next().getPrefix()); // be defensive
271:                    visitor.endPrefixMapping(prefix);
272:                }
273:
274:                seenText = false;
275:            }
276:
277:            private void handleStartElement(StartElement event)
278:                    throws SAXException {
279:                // start namespace bindings
280:                for (Iterator i = event.getNamespaces(); i.hasNext();) {
281:                    Namespace ns = (Namespace) i.next();
282:                    visitor.startPrefixMapping(fixNull(ns.getPrefix()),
283:                            fixNull(ns.getNamespaceURI()));
284:                }
285:
286:                // fire startElement
287:                QName qName = event.getName();
288:                tagName.uri = fixNull(qName.getNamespaceURI());
289:                String localName = qName.getLocalPart();
290:                tagName.uri = fixNull(qName.getNamespaceURI());
291:                tagName.local = localName;
292:                tagName.atts = getAttributes(event);
293:                visitor.startElement(tagName);
294:
295:                seenText = false;
296:            }
297:
298:            /**
299:             * Get the attributes associated with the given START_ELEMENT StAXevent.
300:             *
301:             * @return the StAX attributes converted to an org.xml.sax.Attributes
302:             */
303:            private Attributes getAttributes(StartElement event) {
304:                attrs.clear();
305:
306:                // in SAX, namespace declarations are not part of attributes by default.
307:                // (there's a property to control that, but as far as we are concerned
308:                // we don't use it.) So don't add xmlns:* to attributes.
309:
310:                // gather non-namespace attrs
311:                for (Iterator i = event.getAttributes(); i.hasNext();) {
312:                    Attribute staxAttr = (Attribute) i.next();
313:
314:                    QName name = staxAttr.getName();
315:                    String uri = fixNull(name.getNamespaceURI());
316:                    String localName = name.getLocalPart();
317:                    String prefix = name.getPrefix();
318:                    String qName;
319:                    if (prefix == null || prefix.length() == 0)
320:                        qName = localName;
321:                    else
322:                        qName = prefix + ':' + localName;
323:                    String type = staxAttr.getDTDType();
324:                    String value = staxAttr.getValue();
325:
326:                    attrs.addAttribute(uri, localName, qName, type, value);
327:                }
328:
329:                return attrs;
330:            }
331:        }
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