Source Code Cross Referenced for EffectPipe.java in  » Content-Management-System » apache-lenya-2.0 » org » apache » cocoon » woody » transformation » 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.woody.transformation 
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.woody.transformation;
018:
019:        import java.util.LinkedList;
020:
021:        import org.apache.cocoon.woody.Constants;
022:        import org.apache.cocoon.xml.AbstractXMLPipe;
023:        import org.apache.cocoon.xml.SaxBuffer;
024:        import org.apache.cocoon.xml.XMLConsumer;
025:        import org.xml.sax.Attributes;
026:        import org.xml.sax.ContentHandler;
027:        import org.xml.sax.Locator;
028:        import org.xml.sax.SAXException;
029:        import org.xml.sax.ext.LexicalHandler;
030:        import org.xml.sax.helpers.AttributesImpl;
031:
032:        // TODO: Reduce the Element creation and deletion churn by providing startElement
033:        // and endElement methods which do not create or use Elements on the stack.
034:        /*
035:         * Base class for XMLPipe's. Allows the structure of the source code of
036:         * the XMLPipe to match the structure of the data being transformed.
037:         *
038:         * @author Timothy Larson
039:         * @version $Id: EffectPipe.java 433543 2006-08-22 06:22:54Z crossley $
040:         */
041:        public class EffectPipe extends AbstractXMLPipe {
042:
043:            protected static final int EVENT_SET_DOCUMENT_LOCATOR = 0;
044:            protected static final int EVENT_START_DOCUMENT = 1;
045:            protected static final int EVENT_END_DOCUMENT = 2;
046:            protected static final int EVENT_START_PREFIX_MAPPING = 3;
047:            protected static final int EVENT_END_PREFIX_MAPPING = 4;
048:            protected static final int EVENT_START_ELEMENT = 5;
049:            protected static final int EVENT_END_ELEMENT = 6;
050:            protected static final int EVENT_ELEMENT = 7;
051:            protected static final int EVENT_CHARACTERS = 8;
052:            protected static final int EVENT_IGNORABLE_WHITESPACE = 9;
053:            protected static final int EVENT_PROCESSING_INSTRUCTION = 10;
054:            protected static final int EVENT_SKIPPED_ENTITY = 11;
055:            protected static final int EVENT_START_DTD = 12;
056:            protected static final int EVENT_END_DTD = 13;
057:            protected static final int EVENT_START_ENTITY = 14;
058:            protected static final int EVENT_END_ENTITY = 15;
059:            protected static final int EVENT_START_CDATA = 16;
060:            protected static final int EVENT_END_CDATA = 17;
061:            protected static final int EVENT_COMMENT = 18;
062:
063:            protected class Element {
064:                public String prefix;
065:                public String uri;
066:                public String loc;
067:                public String raw;
068:                public Attributes attrs;
069:                public boolean mine;
070:
071:                public Element() {
072:                    prefix = null;
073:                    uri = null;
074:                    loc = null;
075:                    raw = null;
076:                    attrs = Constants.EMPTY_ATTRS;
077:                    mine = true;
078:                }
079:
080:                public Element(String prefix, String uri) {
081:                    this .prefix = prefix;
082:                    this .uri = uri;
083:                }
084:
085:                public Element(String uri, String loc, String raw,
086:                        Attributes attrs) {
087:                    this .uri = uri;
088:                    this .loc = loc;
089:                    this .raw = raw;
090:                    this .attrs = Constants.EMPTY_ATTRS;
091:                    if (attrs == null) {
092:                        this .attrs = Constants.EMPTY_ATTRS;
093:                        mine = true;
094:                    } else {
095:                        this .attrs = attrs;
096:                        mine = false;
097:                    }
098:                }
099:
100:                public void addAttributes(Attributes attrs) {
101:                    if (attrs != null) {
102:                        if (mine == true) {
103:                            if (this .attrs == Constants.EMPTY_ATTRS) {
104:                                this .attrs = attrs;
105:                                mine = false;
106:                            } else {
107:                                ((AttributesImpl) this .attrs)
108:                                        .setAttributes(attrs);
109:                            }
110:                        } else {
111:                            this .attrs = new AttributesImpl(this .attrs);
112:                            ((AttributesImpl) this .attrs).setAttributes(attrs);
113:                            mine = true;
114:                        }
115:                    }
116:                }
117:
118:                public void addAttribute(String uri, String loc, String raw,
119:                        String type, String value) {
120:                    if (!mine || attrs == Constants.EMPTY_ATTRS) {
121:                        attrs = new AttributesImpl(attrs);
122:                        mine = true;
123:                    }
124:                    ((AttributesImpl) attrs).addAttribute(uri, loc, raw, type,
125:                            value);
126:                }
127:
128:                public void addAttribute(String prefix, String uri, String loc,
129:                        String value) {
130:                    if (!mine || attrs == Constants.EMPTY_ATTRS) {
131:                        attrs = new AttributesImpl(attrs);
132:                        mine = true;
133:                    }
134:                    ((AttributesImpl) attrs).addAttribute(uri, loc, prefix
135:                            + ":" + loc, "CDATA", value);
136:                }
137:
138:                public void addAttribute(String loc, String value) {
139:                    if (!mine || attrs == Constants.EMPTY_ATTRS) {
140:                        attrs = new AttributesImpl(attrs);
141:                        mine = true;
142:                    }
143:                    ((AttributesImpl) attrs).addAttribute("", loc, loc,
144:                            "CDATA", value);
145:                }
146:
147:                public void claimAttributes() {
148:                    if (!mine) {
149:                        attrs = new AttributesImpl(attrs);
150:                        mine = true;
151:                    }
152:                }
153:            }
154:
155:            protected abstract class Handler {
156:                public abstract Handler process() throws SAXException;
157:            }
158:
159:            protected class NullHandler extends Handler {
160:                public Handler process() throws SAXException {
161:                    return this ;
162:                }
163:            }
164:
165:            protected class BufferHandler extends Handler {
166:                public Handler process() throws SAXException {
167:                    switch (event) {
168:                    case EVENT_ELEMENT:
169:                        return this ;
170:                    default:
171:                        out.buffer();
172:                        return this ;
173:                    }
174:                }
175:            }
176:
177:            protected class Output extends AbstractXMLPipe {
178:                private LinkedList buffers = null;
179:                private SaxBuffer saxBuffer = null;
180:                private LinkedList elements = null;
181:                protected Element element = null;
182:
183:                public Output() {
184:                    elements = new LinkedList();
185:                }
186:
187:                public void startPrefixMapping() throws SAXException {
188:                    super .startPrefixMapping(input.prefix, input.uri);
189:                }
190:
191:                public void endPrefixMapping() throws SAXException {
192:                    super .endPrefixMapping(input.prefix);
193:                }
194:
195:                public void element(String prefix, String uri, String loc,
196:                        Attributes attrs) throws SAXException {
197:                    element = new Element(uri, loc, prefix + ":" + loc, attrs);
198:                }
199:
200:                public void element(String prefix, String uri, String loc)
201:                        throws SAXException {
202:                    element(prefix, uri, loc, null);
203:                }
204:
205:                public void element(String loc, Attributes attrs)
206:                        throws SAXException {
207:                    element = new Element("", loc, loc, attrs);
208:                }
209:
210:                public void element(String loc) throws SAXException {
211:                    element(loc, null);
212:                }
213:
214:                public void element() throws SAXException {
215:                    element = new Element(input.uri, input.loc, input.raw,
216:                            input.attrs);
217:                }
218:
219:                public void attribute(String prefix, String uri, String name,
220:                        String value) throws SAXException {
221:                    element.addAttribute(prefix, uri, name, value);
222:                }
223:
224:                public void attribute(String name, String value)
225:                        throws SAXException {
226:                    element.addAttribute(name, value);
227:                }
228:
229:                public void copyAttribute(String prefix, String uri, String name)
230:                        throws SAXException {
231:                    String value = null;
232:                    if (input.attrs != null
233:                            && (value = input.attrs.getValue(uri, name)) != null) {
234:                        attribute(prefix, uri, name, value);
235:                    } else {
236:                        throw new SAXException(
237:                                "Attribute \""
238:                                        + name
239:                                        + "\" cannot be copied because it does not exist.");
240:                    }
241:                }
242:
243:                public void attributes(Attributes attrs) throws SAXException {
244:                    element.addAttributes(attrs);
245:                }
246:
247:                public void attributes() throws SAXException {
248:                    attributes(input.attrs);
249:                }
250:
251:                public void startElement() throws SAXException {
252:                    if (element.attrs == null) {
253:                        element.attrs = Constants.EMPTY_ATTRS;
254:                    }
255:                    super .startElement(element.uri, element.loc, element.raw,
256:                            element.attrs);
257:                    elements.addFirst(element);
258:                    element = null;
259:                }
260:
261:                public void endElement() throws SAXException {
262:                    element = (Element) elements.removeFirst();
263:                    super .endElement(element.uri, element.loc, element.raw);
264:                    element = null;
265:                }
266:
267:                public void startElement(String uri, String loc, String raw,
268:                        Attributes attrs) throws SAXException {
269:                    super .startElement(uri, loc, raw, attrs);
270:                }
271:
272:                public void endElement(String uri, String loc, String raw)
273:                        throws SAXException {
274:                    super .endElement(uri, loc, raw);
275:                }
276:
277:                public void copy() throws SAXException {
278:                    switch (event) {
279:                    case EVENT_SET_DOCUMENT_LOCATOR:
280:                        this .setDocumentLocator(locator);
281:                        break;
282:                    case EVENT_START_DOCUMENT:
283:                        this .startDocument();
284:                        break;
285:                    case EVENT_END_DOCUMENT:
286:                        this .endDocument();
287:                        break;
288:                    case EVENT_START_PREFIX_MAPPING:
289:                        this .startPrefixMapping();
290:                        break;
291:                    case EVENT_END_PREFIX_MAPPING:
292:                        this .endPrefixMapping();
293:                        break;
294:                    case EVENT_START_ELEMENT:
295:                        this .element();
296:                        attributes();
297:                        startElement();
298:                        break;
299:                    case EVENT_END_ELEMENT:
300:                        this .endElement();
301:                        break;
302:                    case EVENT_CHARACTERS:
303:                        this .characters(c, start, len);
304:                        break;
305:                    case EVENT_IGNORABLE_WHITESPACE:
306:                        this .ignorableWhitespace(c, start, len);
307:                        break;
308:                    case EVENT_PROCESSING_INSTRUCTION:
309:                        this .processingInstruction(target, data);
310:                        break;
311:                    case EVENT_SKIPPED_ENTITY:
312:                        this .skippedEntity(name);
313:                        break;
314:                    case EVENT_START_DTD:
315:                        this .startDTD(name, publicId, systemId);
316:                        break;
317:                    case EVENT_END_DTD:
318:                        this .endDTD();
319:                        break;
320:                    case EVENT_START_ENTITY:
321:                        this .startEntity(name);
322:                        break;
323:                    case EVENT_END_ENTITY:
324:                        this .endEntity(name);
325:                        break;
326:                    case EVENT_START_CDATA:
327:                        this .startCDATA();
328:                        break;
329:                    case EVENT_END_CDATA:
330:                        this .endCDATA();
331:                        break;
332:                    case EVENT_COMMENT:
333:                        this .comment(c, start, len);
334:                        break;
335:                    }
336:                }
337:
338:                protected void bufferInit() {
339:                    if (saxBuffer != null) {
340:                        if (buffers == null) {
341:                            buffers = new LinkedList();
342:                        }
343:                        buffers.addFirst(saxBuffer);
344:                    }
345:                    saxBuffer = new SaxBuffer();
346:                }
347:
348:                protected void bufferFini() {
349:                    if (buffers != null && buffers.size() > 0) {
350:                        saxBuffer = (SaxBuffer) buffers.removeFirst();
351:                    } else {
352:                        saxBuffer = null;
353:                    }
354:                }
355:
356:                protected SaxBuffer getBuffer() {
357:                    return saxBuffer;
358:                }
359:
360:                public void buffer() throws SAXException {
361:                    switch (event) {
362:                    case EVENT_SET_DOCUMENT_LOCATOR:
363:                        saxBuffer.setDocumentLocator(locator);
364:                        break;
365:                    case EVENT_START_DOCUMENT:
366:                        saxBuffer.startDocument();
367:                        break;
368:                    case EVENT_END_DOCUMENT:
369:                        saxBuffer.endDocument();
370:                        break;
371:                    case EVENT_START_PREFIX_MAPPING:
372:                        saxBuffer.startPrefixMapping(prefix, uri);
373:                        break;
374:                    case EVENT_END_PREFIX_MAPPING:
375:                        saxBuffer.endPrefixMapping(prefix);
376:                        break;
377:                    case EVENT_START_ELEMENT:
378:                        saxBuffer.startElement(input.uri, input.loc, input.raw,
379:                                input.attrs);
380:                        break;
381:                    case EVENT_END_ELEMENT:
382:                        saxBuffer.endElement(input.uri, input.loc, input.raw);
383:                        break;
384:                    case EVENT_CHARACTERS:
385:                        saxBuffer.characters(c, start, len);
386:                        break;
387:                    case EVENT_IGNORABLE_WHITESPACE:
388:                        saxBuffer.ignorableWhitespace(c, start, len);
389:                        break;
390:                    case EVENT_PROCESSING_INSTRUCTION:
391:                        saxBuffer.processingInstruction(target, data);
392:                        break;
393:                    case EVENT_SKIPPED_ENTITY:
394:                        saxBuffer.skippedEntity(name);
395:                        break;
396:                    case EVENT_START_DTD:
397:                        saxBuffer.startDTD(name, publicId, systemId);
398:                        break;
399:                    case EVENT_END_DTD:
400:                        saxBuffer.endDTD();
401:                        break;
402:                    case EVENT_START_ENTITY:
403:                        saxBuffer.startEntity(name);
404:                        break;
405:                    case EVENT_END_ENTITY:
406:                        saxBuffer.endEntity(name);
407:                        break;
408:                    case EVENT_START_CDATA:
409:                        saxBuffer.startCDATA();
410:                        break;
411:                    case EVENT_END_CDATA:
412:                        saxBuffer.endCDATA();
413:                        break;
414:                    case EVENT_COMMENT:
415:                        saxBuffer.comment(c, start, len);
416:                        break;
417:                    }
418:                }
419:            }
420:
421:            protected int event = 0;
422:
423:            protected Handler nullHandler = new NullHandler();
424:            protected Handler bufferHandler = new BufferHandler();
425:
426:            protected LinkedList handlers = null;
427:            protected Handler handler = null;
428:
429:            protected LinkedList elements = null;
430:            protected Element input = null;
431:
432:            protected Locator locator = null;
433:            protected String name = null;
434:            protected String publicId = null;
435:            protected String systemId = null;
436:            protected String target = null;
437:            protected String data = null;
438:            protected String prefix = null;
439:            protected String uri = null;
440:            protected char c[] = null;
441:            protected int start = 0;
442:            protected int len = 0;
443:
444:            public Output out = null;
445:
446:            public void init() {
447:                handlers = new LinkedList();
448:                elements = new LinkedList();
449:                out = new Output();
450:            }
451:
452:            //====================================
453:            // Methods overriding AbstractXMLPipe
454:            //====================================
455:
456:            public void setConsumer(XMLConsumer consumer) {
457:                super .setConsumer(consumer);
458:                out.setConsumer(consumer);
459:            }
460:
461:            public void setContentHandler(ContentHandler handler) {
462:                super .setContentHandler(handler);
463:                out.setContentHandler(handler);
464:            }
465:
466:            public void setLexicalHandler(LexicalHandler handler) {
467:                super .setLexicalHandler(handler);
468:                out.setLexicalHandler(handler);
469:            }
470:
471:            public void recycle() {
472:                super .recycle();
473:                handlers = null;
474:                elements = null;
475:                out = null;
476:            }
477:
478:            public void setDocumentLocator(Locator locator) {
479:                this .locator = locator;
480:                try {
481:                    event = EVENT_SET_DOCUMENT_LOCATOR;
482:                    handler = handler.process();
483:                } catch (Exception e) {
484:                    throw new RuntimeException(e.getMessage());
485:                }
486:            }
487:
488:            public void startDocument() throws SAXException {
489:                event = EVENT_START_DOCUMENT;
490:                handler = handler.process();
491:            }
492:
493:            public void endDocument() throws SAXException {
494:                event = EVENT_END_DOCUMENT;
495:                handler = handler.process();
496:            }
497:
498:            public void startPrefixMapping(String prefix, String uri)
499:                    throws SAXException {
500:                input = new Element(prefix, uri);
501:                elements.addFirst(input);
502:                //this.prefix = prefix; this.uri = uri;
503:                event = EVENT_START_PREFIX_MAPPING;
504:                handler = handler.process();
505:            }
506:
507:            public void endPrefixMapping(String prefix) throws SAXException {
508:                input = (Element) elements.removeFirst();
509:                //this.prefix = prefix;
510:                event = EVENT_END_PREFIX_MAPPING;
511:                handler = handler.process();
512:                input = null;
513:            }
514:
515:            public void startElement(String uri, String loc, String raw,
516:                    Attributes attrs) throws SAXException {
517:                input = new Element(uri, loc, raw, attrs);
518:                elements.addFirst(input);
519:                handlers.addFirst(handler);
520:                event = EVENT_ELEMENT;
521:                handler = handler.process();
522:                event = EVENT_START_ELEMENT;
523:                handler = handler.process();
524:            }
525:
526:            public void endElement(String uri, String loc, String raw)
527:                    throws SAXException {
528:                input = (Element) elements.removeFirst();
529:                event = EVENT_END_ELEMENT;
530:                handler.process();
531:                handler = (Handler) handlers.removeFirst();
532:                input = null;
533:            }
534:
535:            public void characters(char c[], int start, int len)
536:                    throws SAXException {
537:                this .c = c;
538:                this .start = start;
539:                this .len = len;
540:                event = EVENT_CHARACTERS;
541:                handler = handler.process();
542:            }
543:
544:            public void ignorableWhitespace(char c[], int start, int len)
545:                    throws SAXException {
546:                this .c = c;
547:                this .start = start;
548:                this .len = len;
549:                event = EVENT_IGNORABLE_WHITESPACE;
550:                handler = handler.process();
551:            }
552:
553:            public void processingInstruction(String target, String data)
554:                    throws SAXException {
555:                this .target = target;
556:                this .data = data;
557:                event = EVENT_PROCESSING_INSTRUCTION;
558:                handler = handler.process();
559:            }
560:
561:            public void skippedEntity(String name) throws SAXException {
562:                this .name = name;
563:                event = EVENT_SKIPPED_ENTITY;
564:                handler = handler.process();
565:            }
566:
567:            public void startDTD(String name, String publicId, String systemId)
568:                    throws SAXException {
569:                this .name = name;
570:                this .publicId = publicId;
571:                this .systemId = systemId;
572:                event = EVENT_START_DTD;
573:                handler = handler.process();
574:            }
575:
576:            public void endDTD() throws SAXException {
577:                event = EVENT_END_DTD;
578:                handler = handler.process();
579:            }
580:
581:            public void startEntity(String name) throws SAXException {
582:                this .name = name;
583:                event = EVENT_START_ENTITY;
584:                handler = handler.process();
585:            }
586:
587:            public void endEntity(String name) throws SAXException {
588:                this .name = name;
589:                event = EVENT_END_ENTITY;
590:                handler = handler.process();
591:            }
592:
593:            public void startCDATA() throws SAXException {
594:                event = EVENT_START_CDATA;
595:                handler = handler.process();
596:            }
597:
598:            public void endCDATA() throws SAXException {
599:                event = EVENT_END_CDATA;
600:                handler = handler.process();
601:            }
602:
603:            public void comment(char c[], int start, int len)
604:                    throws SAXException {
605:                this.c = c;
606:                this.start = start;
607:                this.len = len;
608:                event = EVENT_COMMENT;
609:                handler = handler.process();
610:            }
611:        }
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