Source Code Cross Referenced for AbstractTextSerializer.java in  » Content-Management-System » apache-lenya-2.0 » org » apache » cocoon » serialization » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Content Management System » apache lenya 2.0 » org.apache.cocoon.serialization 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Licensed to the Apache Software Foundation (ASF) under one or more
003:         * contributor license agreements.  See the NOTICE file distributed with
004:         * this work for additional information regarding copyright ownership.
005:         * The ASF licenses this file to You under the Apache License, Version 2.0
006:         * (the "License"); you may not use this file except in compliance with
007:         * the License.  You may obtain a copy of the License at
008:         *
009:         *      http://www.apache.org/licenses/LICENSE-2.0
010:         *
011:         * Unless required by applicable law or agreed to in writing, software
012:         * distributed under the License is distributed on an "AS IS" BASIS,
013:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         * See the License for the specific language governing permissions and
015:         * limitations under the License.
016:         */
017:        package org.apache.cocoon.serialization;
018:
019:        import org.apache.avalon.framework.configuration.Configurable;
020:        import org.apache.avalon.framework.configuration.Configuration;
021:        import org.apache.avalon.framework.configuration.ConfigurationException;
022:        import org.apache.avalon.framework.context.Context;
023:        import org.apache.avalon.framework.context.ContextException;
024:        import org.apache.avalon.framework.context.Contextualizable;
025:        import org.apache.cocoon.Constants;
026:        import org.apache.cocoon.caching.CacheableProcessingComponent;
027:        import org.apache.cocoon.util.ClassUtils;
028:        import org.apache.cocoon.util.TraxErrorHandler;
029:        import org.apache.cocoon.xml.AbstractXMLPipe;
030:        import org.apache.cocoon.xml.XMLConsumer;
031:        import org.apache.cocoon.xml.XMLUtils;
032:
033:        import org.apache.commons.lang.BooleanUtils;
034:        import org.apache.excalibur.source.SourceValidity;
035:        import org.apache.excalibur.source.impl.validity.NOPValidity;
036:        import org.xml.sax.Attributes;
037:        import org.xml.sax.ContentHandler;
038:        import org.xml.sax.SAXException;
039:        import org.xml.sax.ext.LexicalHandler;
040:        import org.xml.sax.helpers.AttributesImpl;
041:
042:        import javax.xml.transform.OutputKeys;
043:        import javax.xml.transform.TransformerFactory;
044:        import javax.xml.transform.TransformerException;
045:        import javax.xml.transform.sax.SAXTransformerFactory;
046:        import javax.xml.transform.sax.TransformerHandler;
047:        import javax.xml.transform.stream.StreamResult;
048:        import java.io.StringWriter;
049:        import java.util.ArrayList;
050:        import java.util.HashMap;
051:        import java.util.List;
052:        import java.util.Map;
053:        import java.util.Properties;
054:
055:        /**
056:         * @author <a href="mailto:pier@apache.org">Pierpaolo Fumagalli</a>
057:         *         (Apache Software Foundation)
058:         * @author <a href="mailto:stefano@apache.org">Stefano Mazzocchi</a>
059:         * @author <a href="mailto:sylvain.wallez@anyware-tech.com">Sylvain Wallez</a>
060:         * @version $Id: AbstractTextSerializer.java 433543 2006-08-22 06:22:54Z crossley $
061:         */
062:        public abstract class AbstractTextSerializer extends AbstractSerializer
063:                implements  Configurable, CacheableProcessingComponent,
064:                Contextualizable {
065:
066:            /**
067:             * Cache for avoiding unnecessary checks of namespaces abilities.
068:             * It associates a Boolean to the transformer class name.
069:             */
070:            private static final Map needsNamespaceCache = new HashMap();
071:
072:            /**
073:             * The trax <code>TransformerFactory</code> used by this serializer.
074:             */
075:            private SAXTransformerFactory tfactory;
076:
077:            /**
078:             * The <code>Properties</code> used by this serializer.
079:             */
080:            protected final Properties format = new Properties();
081:
082:            /**
083:             * The pipe that adds namespaces as xmlns attributes.
084:             */
085:            private NamespaceAsAttributes namespacePipe;
086:
087:            /**
088:             * The caching key
089:             */
090:            private String cachingKey = "1";
091:
092:            /**
093:             * Interpose namespace pipe if needed.
094:             */
095:            public void setConsumer(XMLConsumer consumer) {
096:                if (this .namespacePipe == null) {
097:                    super .setConsumer(consumer);
098:                } else {
099:                    this .namespacePipe.setConsumer(consumer);
100:                    super .setConsumer(this .namespacePipe);
101:                }
102:            }
103:
104:            /**
105:             * Interpose namespace pipe if needed.
106:             */
107:            public void setContentHandler(ContentHandler handler) {
108:                if (this .namespacePipe == null) {
109:                    super .setContentHandler(handler);
110:                } else {
111:                    this .namespacePipe.setContentHandler(handler);
112:                    super .setContentHandler(this .namespacePipe);
113:                }
114:            }
115:
116:            /**
117:             * Interpose namespace pipe if needed.
118:             */
119:            public void setLexicalHandler(LexicalHandler handler) {
120:                if (this .namespacePipe == null) {
121:                    super .setLexicalHandler(handler);
122:                } else {
123:                    this .namespacePipe.setLexicalHandler(handler);
124:                    super .setLexicalHandler(this .namespacePipe);
125:                }
126:            }
127:
128:            /**
129:             * Helper for TransformerFactory.
130:             */
131:            protected SAXTransformerFactory getTransformerFactory() {
132:                return tfactory;
133:            }
134:
135:            /**
136:             * Helper for TransformerHandler.
137:             */
138:            protected TransformerHandler getTransformerHandler()
139:                    throws TransformerException {
140:                return this .getTransformerFactory().newTransformerHandler();
141:            }
142:
143:            ///**
144:            // * Set the {@link OutputStream} where the requested resource should
145:            // * be serialized.
146:            // */
147:            // public void setOutputStream(OutputStream out) throws IOException {
148:            /*
149:             * Add a level of buffering to the output stream. Xalan serializes
150:             * every character individually. In conjunction with chunked
151:             * transfer encoding this would otherwise lead to a whopping 6-fold
152:             * increase of data on the wire.
153:             */
154:            //  if (outputBufferSize > 0) {
155:            //      super.setOutputStream(
156:            //        new BufferedOutputStream(out, outputBufferSize));
157:            //  } else {
158:            // super.setOutputStream(out);
159:            //  }
160:            // }
161:            /**
162:             * Uses the context to retrieve a default encoding for the serializers.
163:             */
164:            public void contextualize(Context context) throws ContextException {
165:                String defaultEncoding = (String) context
166:                        .get(Constants.CONTEXT_DEFAULT_ENCODING);
167:                if (defaultEncoding != null) {
168:                    this .format.setProperty(OutputKeys.ENCODING,
169:                            defaultEncoding);
170:                }
171:            }
172:
173:            /**
174:             * Set the configurations for this serializer.
175:             */
176:            public void configure(Configuration conf)
177:                    throws ConfigurationException {
178:                // configure buffer size
179:                //   Configuration bsc = conf.getChild("buffer-size", false);
180:                //   if(null != bsc)
181:                //    outputBufferSize = bsc.getValueAsInteger(DEFAULT_BUFFER_SIZE);
182:
183:                // configure xalan
184:                String cdataSectionElements = conf.getChild(
185:                        "cdata-section-elements").getValue(null);
186:                String dtPublic = conf.getChild("doctype-public")
187:                        .getValue(null);
188:                String dtSystem = conf.getChild("doctype-system")
189:                        .getValue(null);
190:                String encoding = conf.getChild("encoding").getValue(null);
191:                String indent = conf.getChild("indent").getValue(null);
192:                String mediaType = conf.getChild("media-type").getValue(null);
193:                String method = conf.getChild("method").getValue(null);
194:                String omitXMLDeclaration = conf.getChild(
195:                        "omit-xml-declaration").getValue(null);
196:                String standAlone = conf.getChild("standalone").getValue(null);
197:                String version = conf.getChild("version").getValue(null);
198:
199:                final StringBuffer buffer = new StringBuffer();
200:
201:                if (cdataSectionElements != null) {
202:                    format.put(OutputKeys.CDATA_SECTION_ELEMENTS,
203:                            cdataSectionElements);
204:                    buffer.append(";cdata-section-elements=").append(
205:                            cdataSectionElements);
206:                }
207:                if (dtPublic != null) {
208:                    format.put(OutputKeys.DOCTYPE_PUBLIC, dtPublic);
209:                    buffer.append(";doctype-public=").append(dtPublic);
210:                }
211:                if (dtSystem != null) {
212:                    format.put(OutputKeys.DOCTYPE_SYSTEM, dtSystem);
213:                    buffer.append(";doctype-system=").append(dtSystem);
214:                }
215:                if (encoding != null) {
216:                    format.put(OutputKeys.ENCODING, encoding);
217:                    buffer.append(";encoding=").append(encoding);
218:                }
219:                if (indent != null) {
220:                    format.put(OutputKeys.INDENT, indent);
221:                    buffer.append(";indent=").append(indent);
222:                }
223:                if (mediaType != null) {
224:                    format.put(OutputKeys.MEDIA_TYPE, mediaType);
225:                    buffer.append(";media-type=").append(mediaType);
226:                }
227:                if (method != null) {
228:                    format.put(OutputKeys.METHOD, method);
229:                    buffer.append(";method=").append(method);
230:                }
231:                if (omitXMLDeclaration != null) {
232:                    format.put(OutputKeys.OMIT_XML_DECLARATION,
233:                            omitXMLDeclaration);
234:                    buffer.append(";omit-xml-declaration=").append(
235:                            omitXMLDeclaration);
236:                }
237:                if (standAlone != null) {
238:                    format.put(OutputKeys.STANDALONE, standAlone);
239:                    buffer.append(";standalone=").append(standAlone);
240:                }
241:                if (version != null) {
242:                    format.put(OutputKeys.VERSION, version);
243:                    buffer.append(";version=").append(version);
244:                }
245:
246:                if (buffer.length() > 0) {
247:                    this .cachingKey = buffer.toString();
248:                }
249:
250:                String tFactoryClass = conf.getChild("transformer-factory")
251:                        .getValue(null);
252:                if (tFactoryClass != null) {
253:                    try {
254:                        this .tfactory = (SAXTransformerFactory) ClassUtils
255:                                .newInstance(tFactoryClass);
256:                        if (getLogger().isDebugEnabled()) {
257:                            getLogger().debug(
258:                                    "Using transformer factory "
259:                                            + tFactoryClass);
260:                        }
261:                    } catch (Exception e) {
262:                        throw new ConfigurationException(
263:                                "Cannot load transformer factory "
264:                                        + tFactoryClass, e);
265:                    }
266:                } else {
267:                    // Standard TrAX behaviour
268:                    this .tfactory = (SAXTransformerFactory) TransformerFactory
269:                            .newInstance();
270:                }
271:                tfactory.setErrorListener(new TraxErrorHandler(getLogger()));
272:
273:                // Check if we need namespace as attributes.
274:                try {
275:                    if (needsNamespacesAsAttributes()) {
276:                        // Setup a correction pipe
277:                        this .namespacePipe = new NamespaceAsAttributes();
278:                        this .namespacePipe.enableLogging(getLogger());
279:                    }
280:                } catch (Exception e) {
281:                    getLogger()
282:                            .warn(
283:                                    "Cannot know if transformer needs namespaces attributes - assuming NO.",
284:                                    e);
285:                }
286:            }
287:
288:            /**
289:             * @see org.apache.avalon.excalibur.pool.Recyclable#recycle()
290:             */
291:            public void recycle() {
292:                super .recycle();
293:
294:                if (this .namespacePipe != null) {
295:                    this .namespacePipe.recycle();
296:                }
297:            }
298:
299:            /**
300:             * Generate the unique key.
301:             * This key must be unique inside the space of this component.
302:             * This method must be invoked before the generateValidity() method.
303:             *
304:             * @return The generated key or <code>0</code> if the component
305:             *              is currently not cacheable.
306:             */
307:            public java.io.Serializable getKey() {
308:                return this .cachingKey;
309:            }
310:
311:            /**
312:             * Generate the validity object.
313:             * Before this method can be invoked the generateKey() method
314:             * must be invoked.
315:             *
316:             * @return The generated validity object or <code>null</code> if the
317:             *         component is currently not cacheable.
318:             */
319:            public SourceValidity getValidity() {
320:                return NOPValidity.SHARED_INSTANCE;
321:            }
322:
323:            /**
324:             * Checks if the used Trax implementation correctly handles namespaces set using
325:             * <code>startPrefixMapping()</code>, but wants them also as 'xmlns:' attributes.
326:             * <p>
327:             * The check consists in sending SAX events representing a minimal namespaced document
328:             * with namespaces defined only with calls to <code>startPrefixMapping</code> (no
329:             * xmlns:xxx attributes) and check if they are present in the resulting text.
330:             */
331:            protected boolean needsNamespacesAsAttributes() throws Exception {
332:
333:                SAXTransformerFactory factory = getTransformerFactory();
334:
335:                Boolean cacheValue = (Boolean) needsNamespaceCache.get(factory
336:                        .getClass().getName());
337:                if (cacheValue != null) {
338:                    return cacheValue.booleanValue();
339:                } else {
340:                    // Serialize a minimal document to check how namespaces are handled.
341:                    StringWriter writer = new StringWriter();
342:
343:                    String uri = "namespaceuri";
344:                    String prefix = "nsp";
345:                    String check = "xmlns:" + prefix + "='" + uri + "'";
346:
347:                    TransformerHandler handler = this .getTransformerHandler();
348:
349:                    handler.getTransformer().setOutputProperties(format);
350:                    handler.setResult(new StreamResult(writer));
351:
352:                    // Output a single element
353:                    handler.startDocument();
354:                    handler.startPrefixMapping(prefix, uri);
355:                    handler.startElement(uri, "element", "element",
356:                            XMLUtils.EMPTY_ATTRIBUTES);
357:                    handler.endElement(uri, "element", "element");
358:                    handler.endPrefixMapping(prefix);
359:                    handler.endDocument();
360:
361:                    String text = writer.toString();
362:
363:                    // Check if the namespace is there (replace " by ' to be sure of what we search in)
364:                    boolean needsIt = (text.replace('"', '\'').indexOf(check) == -1);
365:
366:                    String msg = needsIt ? " needs namespace attributes (will be slower)."
367:                            : " handles correctly namespaces.";
368:
369:                    getLogger().debug(
370:                            "Trax handler " + handler.getClass().getName()
371:                                    + msg);
372:
373:                    needsNamespaceCache.put(factory.getClass().getName(),
374:                            BooleanUtils.toBooleanObject(needsIt));
375:
376:                    return needsIt;
377:                }
378:            }
379:
380:            //--------------------------------------------------------------------------------------------
381:
382:            /**
383:             * A pipe that ensures that all namespace prefixes are also present as
384:             * 'xmlns:' attributes. This used to circumvent Xalan's serialization behaviour
385:             * which is to ignore namespaces if they're not present as 'xmlns:xxx' attributes.
386:             */
387:            public static class NamespaceAsAttributes extends AbstractXMLPipe {
388:
389:                /**
390:                 * The prefixes of startPrefixMapping() declarations for the coming element.
391:                 */
392:                private List prefixList = new ArrayList();
393:
394:                /**
395:                 * The URIs of startPrefixMapping() declarations for the coming element.
396:                 */
397:                private List uriList = new ArrayList();
398:
399:                /**
400:                 * Maps of URI<->prefix mappings. Used to work around a bug in the Xalan
401:                 * serializer.
402:                 */
403:                private Map uriToPrefixMap = new HashMap();
404:                private Map prefixToUriMap = new HashMap();
405:
406:                /**
407:                 * True if there has been some startPrefixMapping() for the coming element.
408:                 */
409:                private boolean hasMappings = false;
410:
411:                public void startDocument() throws SAXException {
412:                    // Cleanup
413:                    this .uriToPrefixMap.clear();
414:                    this .prefixToUriMap.clear();
415:                    clearMappings();
416:                    super .startDocument();
417:                }
418:
419:                /**
420:                 * Track mappings to be able to add <code>xmlns:</code> attributes
421:                 * in <code>startElement()</code>.
422:                 */
423:                public void startPrefixMapping(String prefix, String uri)
424:                        throws SAXException {
425:                    // Store the mappings to reconstitute xmlns:attributes
426:                    // except prefixes starting with "xml": these are reserved
427:                    // VG: (uri != null) fixes NPE in startElement
428:                    if (uri != null && !prefix.startsWith("xml")) {
429:                        this .hasMappings = true;
430:                        this .prefixList.add(prefix);
431:                        this .uriList.add(uri);
432:
433:                        // append the prefix colon now, in order to save concatenations later, but
434:                        // only for non-empty prefixes.
435:                        if (prefix.length() > 0) {
436:                            this .uriToPrefixMap.put(uri, prefix + ":");
437:                        } else {
438:                            this .uriToPrefixMap.put(uri, prefix);
439:                        }
440:
441:                        this .prefixToUriMap.put(prefix, uri);
442:                    }
443:                    super .startPrefixMapping(prefix, uri);
444:                }
445:
446:                /**
447:                 * Ensure all namespace declarations are present as <code>xmlns:</code> attributes
448:                 * and add those needed before calling superclass. This is a workaround for a Xalan bug
449:                 * (at least in version 2.0.1) : <code>org.apache.xalan.serialize.SerializerToXML</code>
450:                 * ignores <code>start/endPrefixMapping()</code>.
451:                 */
452:                public void startElement(String eltUri, String eltLocalName,
453:                        String eltQName, Attributes attrs) throws SAXException {
454:
455:                    // try to restore the qName. The map already contains the colon
456:                    if (null != eltUri && eltUri.length() != 0
457:                            && this .uriToPrefixMap.containsKey(eltUri)) {
458:                        eltQName = this .uriToPrefixMap.get(eltUri)
459:                                + eltLocalName;
460:                    }
461:                    if (this .hasMappings) {
462:                        // Add xmlns* attributes where needed
463:
464:                        // New Attributes if we have to add some.
465:                        AttributesImpl newAttrs = null;
466:
467:                        int mappingCount = this .prefixList.size();
468:                        int attrCount = attrs.getLength();
469:
470:                        for (int mapping = 0; mapping < mappingCount; mapping++) {
471:
472:                            // Build infos for this namespace
473:                            String uri = (String) this .uriList.get(mapping);
474:                            String prefix = (String) this .prefixList
475:                                    .get(mapping);
476:                            String qName = prefix.length() == 0 ? "xmlns"
477:                                    : ("xmlns:" + prefix);
478:
479:                            // Search for the corresponding xmlns* attribute
480:                            boolean found = false;
481:                            for (int attr = 0; attr < attrCount; attr++) {
482:                                if (qName.equals(attrs.getQName(attr))) {
483:                                    // Check if mapping and attribute URI match
484:                                    if (!uri.equals(attrs.getValue(attr))) {
485:                                        getLogger().error(
486:                                                "URI in prefix mapping and attribute do not match : '"
487:                                                        + uri + "' - '"
488:                                                        + attrs.getURI(attr)
489:                                                        + "'");
490:                                        throw new SAXException(
491:                                                "URI in prefix mapping and attribute do not match");
492:                                    }
493:                                    found = true;
494:                                    break;
495:                                }
496:                            }
497:
498:                            if (!found) {
499:                                // Need to add this namespace
500:                                if (newAttrs == null) {
501:                                    // Need to test if attrs is empty or we go into an infinite loop...
502:                                    // Well know SAX bug which I spent 3 hours to remind of :-(
503:                                    if (attrCount == 0) {
504:                                        newAttrs = new AttributesImpl();
505:                                    } else {
506:                                        newAttrs = new AttributesImpl(attrs);
507:                                    }
508:                                }
509:
510:                                if (prefix.length() == 0) {
511:                                    newAttrs.addAttribute(
512:                                            Constants.XML_NAMESPACE_URI,
513:                                            "xmlns", "xmlns", "CDATA", uri);
514:                                } else {
515:                                    newAttrs.addAttribute(
516:                                            Constants.XML_NAMESPACE_URI,
517:                                            prefix, qName, "CDATA", uri);
518:                                }
519:                            }
520:                        } // end for mapping
521:
522:                        // Cleanup for the next element
523:                        clearMappings();
524:
525:                        // Start element with new attributes, if any
526:                        super .startElement(eltUri, eltLocalName, eltQName,
527:                                newAttrs == null ? attrs : newAttrs);
528:                    } else {
529:                        // Normal job
530:                        super .startElement(eltUri, eltLocalName, eltQName,
531:                                attrs);
532:                    }
533:                }
534:
535:                /**
536:                 * Receive notification of the end of an element.
537:                 * Try to restore the element qName.
538:                 */
539:                public void endElement(String eltUri, String eltLocalName,
540:                        String eltQName) throws SAXException {
541:                    // try to restore the qName. The map already contains the colon
542:                    if (null != eltUri && eltUri.length() != 0
543:                            && this .uriToPrefixMap.containsKey(eltUri)) {
544:                        eltQName = this .uriToPrefixMap.get(eltUri)
545:                                + eltLocalName;
546:                    }
547:                    super .endElement(eltUri, eltLocalName, eltQName);
548:                }
549:
550:                /**
551:                 * End the scope of a prefix-URI mapping:
552:                 * remove entry from mapping tables.
553:                 */
554:                public void endPrefixMapping(String prefix) throws SAXException {
555:                    // remove mappings for xalan-bug-workaround.
556:                    // Unfortunately, we're not passed the uri, but the prefix here,
557:                    // so we need to maintain maps in both directions.
558:                    if (this .prefixToUriMap.containsKey(prefix)) {
559:                        this .uriToPrefixMap.remove(this .prefixToUriMap
560:                                .get(prefix));
561:                        this .prefixToUriMap.remove(prefix);
562:                    }
563:
564:                    if (hasMappings) {
565:                        // most of the time, start/endPrefixMapping calls have an element event between them,
566:                        // which will clear the hasMapping flag and so this code will only be executed in the
567:                        // rather rare occasion when there are start/endPrefixMapping calls with no element
568:                        // event in between. If we wouldn't remove the items from the prefixList and uriList here,
569:                        // the namespace would be incorrectly declared on the next element following the
570:                        // endPrefixMapping call.
571:                        int pos = prefixList.lastIndexOf(prefix);
572:                        if (pos != -1) {
573:                            prefixList.remove(pos);
574:                            uriList.remove(pos);
575:                        }
576:                    }
577:
578:                    super .endPrefixMapping(prefix);
579:                }
580:
581:                /**
582:                 *
583:                 */
584:                public void endDocument() throws SAXException {
585:                    // Cleanup
586:                    this .uriToPrefixMap.clear();
587:                    this .prefixToUriMap.clear();
588:                    clearMappings();
589:                    super .endDocument();
590:                }
591:
592:                private void clearMappings() {
593:                    this .hasMappings = false;
594:                    this.prefixList.clear();
595:                    this.uriList.clear();
596:                }
597:            }
598:        }
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