Source Code Cross Referenced for EffectWidgetReplacingPipe.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 org.apache.avalon.excalibur.pool.Recyclable;
020:        import org.apache.cocoon.i18n.I18nUtils;
021:        import org.apache.cocoon.woody.Constants;
022:        import org.apache.cocoon.woody.formmodel.AggregateField;
023:        import org.apache.cocoon.woody.formmodel.Repeater;
024:        import org.apache.cocoon.woody.formmodel.Struct;
025:        import org.apache.cocoon.woody.formmodel.Union;
026:        import org.apache.cocoon.woody.formmodel.Widget;
027:        import org.apache.cocoon.woody.validation.ValidationError;
028:        import org.apache.cocoon.woody.validation.ValidationErrorAware;
029:        import org.apache.cocoon.xml.AbstractXMLPipe;
030:        import org.apache.cocoon.xml.SaxBuffer;
031:        import org.apache.commons.jxpath.JXPathException;
032:
033:        import org.xml.sax.Attributes;
034:        import org.xml.sax.ContentHandler;
035:        import org.xml.sax.SAXException;
036:        import org.xml.sax.ext.LexicalHandler;
037:        import org.xml.sax.helpers.AttributesImpl;
038:
039:        import java.util.HashMap;
040:        import java.util.LinkedList;
041:        import java.util.Locale;
042:        import java.util.Map;
043:
044:        // TODO: Reduce the Element creation and deletion churn by using startElement
045:        // and endElement methods which do not create or use Elements on the stack.
046:        // The corresponding TODO in the EffectPipe needs to be completed first.
047:
048:        /**
049:         * The basic operation of this Pipe is that it replaces wt:widget (in the
050:         * {@link Constants#WT_NS} namespace) tags (having an id attribute)
051:         * by the XML representation of the corresponding widget instance.
052:         *
053:         * <p>These XML fragments (normally all in the {@link Constants#WI_NS "Woody Instance"} namespace), can
054:         * then be translated to a HTML presentation by an XSL. This XSL will then only have to style
055:         * individual widget, and will not need to do the whole page layout.
056:         *
057:         * <p>For more information about the supported tags and their function, see the user documentation
058:         * for the woody template transformer.</p>
059:         *
060:         * @author Timothy Larson
061:         * @version CVS $Id: EffectWidgetReplacingPipe.java 433543 2006-08-22 06:22:54Z crossley $
062:         */
063:        public class EffectWidgetReplacingPipe extends EffectPipe {
064:
065:            /**
066:             * Form location attribute on <code>wt:form-template</code> element, containing
067:             * JXPath expression which should result in Form object.
068:             *
069:             * @see WoodyPipelineConfig#findForm(String)
070:             */
071:            private static final String LOCATION = "location";
072:
073:            private static final String CLASS = "class";
074:            private static final String CONTINUATION_ID = "continuation-id";
075:            private static final String FORM_TEMPLATE_EL = "form-template";
076:            private static final String NEW = "new";
077:            private static final String REPEATER_SIZE = "repeater-size";
078:            private static final String REPEATER_WIDGET = "repeater-widget";
079:            private static final String REPEATER_WIDGET_LABEL = "repeater-widget-label";
080:            private static final String AGGREGATE_WIDGET = "aggregate-widget";
081:            private static final String STRUCT = "struct";
082:            private static final String STYLING_EL = "styling";
083:            private static final String UNION = "union";
084:            private static final String VALIDATION_ERROR = "validation-error";
085:            private static final String WIDGET_LABEL = "widget-label";
086:            private static final String WIDGET = "widget";
087:
088:            protected Widget contextWidget;
089:            protected LinkedList contextWidgets;
090:            protected String widgetId;
091:            protected Widget widget;
092:            protected Map classes;
093:
094:            private final DocHandler docHandler = new DocHandler();
095:            private final FormHandler formHandler = new FormHandler();
096:            private final NestedHandler nestedHandler = new NestedHandler();
097:            private final WidgetLabelHandler widgetLabelHandler = new WidgetLabelHandler();
098:            private final WidgetHandler widgetHandler = new WidgetHandler();
099:            private final RepeaterSizeHandler repeaterSizeHandler = new RepeaterSizeHandler();
100:            private final RepeaterWidgetLabelHandler repeaterWidgetLabelHandler = new RepeaterWidgetLabelHandler();
101:            private final RepeaterWidgetHandler repeaterWidgetHandler = new RepeaterWidgetHandler();
102:            private final AggregateWidgetHandler aggregateWidgetHandler = new AggregateWidgetHandler();
103:            private final StructHandler structHandler = new StructHandler();
104:            private final UnionHandler unionHandler = new UnionHandler();
105:            private final UnionPassThruHandler unionPassThruHandler = new UnionPassThruHandler();
106:            private final NewHandler newHandler = new NewHandler();
107:            private final ClassHandler classHandler = new ClassHandler();
108:            private final ContinuationIdHandler continuationIdHandler = new ContinuationIdHandler();
109:            private final StylingContentHandler stylingHandler = new StylingContentHandler();
110:            private final ValidationErrorHandler validationErrorHandler = new ValidationErrorHandler();
111:
112:            /**
113:             * Map containing all handlers
114:             */
115:            private final Map templates = new HashMap(12, 1);
116:
117:            protected WoodyPipelineConfig pipeContext;
118:
119:            /**
120:             * Have we encountered a <wi:style> element in a widget ?
121:             */
122:            protected boolean gotStylingElement;
123:
124:            /**
125:             * Namespace prefix used for the namespace <code>Constants.WT_NS</code>.
126:             */
127:            protected String namespacePrefix;
128:
129:            public EffectWidgetReplacingPipe() {
130:                // Setup map of templates.
131:                templates.put(WIDGET, widgetHandler);
132:                templates.put(WIDGET_LABEL, widgetLabelHandler);
133:                templates.put(REPEATER_WIDGET, repeaterWidgetHandler);
134:                templates.put(AGGREGATE_WIDGET, aggregateWidgetHandler);
135:                templates.put(REPEATER_SIZE, repeaterSizeHandler);
136:                templates
137:                        .put(REPEATER_WIDGET_LABEL, repeaterWidgetLabelHandler);
138:                templates.put(STRUCT, structHandler);
139:                templates.put(UNION, unionHandler);
140:                templates.put(NEW, newHandler);
141:                templates.put(CLASS, classHandler);
142:                templates.put(CONTINUATION_ID, continuationIdHandler);
143:                templates.put(VALIDATION_ERROR, validationErrorHandler);
144:            }
145:
146:            private void throwSAXException(String message) throws SAXException {
147:                throw new SAXException("EffectWoodyTemplateTransformer: "
148:                        + message);
149:            }
150:
151:            public void init(Widget contextWidget,
152:                    WoodyPipelineConfig pipeContext) {
153:                super .init();
154:                this .pipeContext = pipeContext;
155:
156:                // Attach document handler
157:                handler = docHandler;
158:
159:                // Initialize widget related variables
160:                contextWidgets = new LinkedList();
161:                classes = new HashMap();
162:            }
163:
164:            protected String getWidgetId(Attributes attributes)
165:                    throws SAXException {
166:                String widgetId = attributes.getValue("id");
167:                if (widgetId == null || widgetId.length() == 0) {
168:                    throwSAXException("Missing required widget \"id\" attribute.");
169:                }
170:                return widgetId;
171:            }
172:
173:            protected Widget getWidget(String widgetId) throws SAXException {
174:                Widget widget = contextWidget.getWidget(widgetId);
175:                if (widget == null) {
176:                    if (contextWidget.getFullyQualifiedId() == null) {
177:                        throwSAXException("Widget with id \"" + widgetId
178:                                + "\" does not exist in the form container.");
179:                    } else {
180:                        throwSAXException("Widget with id \"" + widgetId
181:                                + "\" does not exist in the container \""
182:                                + contextWidget.getFullyQualifiedId() + "\"");
183:                    }
184:                }
185:                return widget;
186:            }
187:
188:            protected void getRepeaterWidget(String handler)
189:                    throws SAXException {
190:                widgetId = getWidgetId(input.attrs);
191:                widget = getWidget(widgetId);
192:                if (!(widget instanceof  Repeater)) {
193:                    throwWrongWidgetType("RepeaterWidgetLabelHandler",
194:                            input.loc, "repeater");
195:                }
196:            }
197:
198:            public void throwWrongWidgetType(String pipeName, String element,
199:                    String widget) throws SAXException {
200:                throwSAXException(pipeName + ": Element \"" + element
201:                        + "\" can only be used for " + widget + " widgets.");
202:            }
203:
204:            /**
205:             * Needed to get things working with JDK 1.3. Can be removed once we
206:             * don't support that platform any more.
207:             */
208:            private ContentHandler getContentHandler() {
209:                return this .contentHandler;
210:            }
211:
212:            /**
213:             * Needed to get things working with JDK 1.3. Can be removed once we
214:             * don't support that platform any more.
215:             */
216:            private LexicalHandler getLexicalHandler() {
217:                return this .lexicalHandler;
218:            }
219:
220:            public Handler nestedTemplate() throws SAXException {
221:                if (Constants.WT_NS.equals(input.uri)) {
222:                    // Element in woody template namespace.
223:                    Handler handler = (Handler) templates.get(input.loc);
224:                    if (handler != null) {
225:                        return handler;
226:                    } else if (FORM_TEMPLATE_EL.equals(input.loc)) {
227:                        throwSAXException("Element \"form-template\" must not be nested.");
228:                        return null; // Keep the compiler happy.
229:                    } else {
230:                        throwSAXException("Unrecognized template: " + input.loc);
231:                        return null; // Keep the compiler happy.
232:                    }
233:                } else {
234:                    // Element not in woody namespace.
235:                    return nestedHandler;
236:                }
237:            }
238:
239:            //==============================================
240:            // Handler classes to transform Woody templates
241:            //==============================================
242:
243:            protected class DocHandler extends Handler {
244:                public Handler process() throws SAXException {
245:                    switch (event) {
246:                    case EVENT_SET_DOCUMENT_LOCATOR:
247:                        return this ;
248:                    case EVENT_START_PREFIX_MAPPING:
249:                        // We consume this namespace completely
250:                        EffectWidgetReplacingPipe.this .namespacePrefix = input.prefix;
251:                        return this ;
252:                    case EVENT_ELEMENT:
253:                        if (Constants.WT_NS.equals(input.uri)) {
254:                            if (FORM_TEMPLATE_EL.equals(input.loc)) {
255:                                return formHandler;
256:                            } else {
257:                                throwSAXException("Woody template \""
258:                                        + input.loc
259:                                        + "\" not permitted outside \"form-template\"");
260:                            }
261:                        } else {
262:                            return this ;
263:                        }
264:                    case EVENT_END_PREFIX_MAPPING:
265:                        // We consume this namespace completely
266:                        return this ;
267:                    default:
268:                        out.copy();
269:                        return this ;
270:                    }
271:                }
272:            }
273:
274:            protected class FormHandler extends Handler {
275:                public Handler process() throws SAXException {
276:                    switch (event) {
277:                    case EVENT_START_ELEMENT:
278:                        if (contextWidget != null) {
279:                            throwSAXException("Detected nested wt:form-template elements, this is not allowed.");
280:                        }
281:                        out.startPrefixMapping(Constants.WI_PREFIX,
282:                                Constants.WI_NS);
283:
284:                        // ====> Retrieve the form
285:                        // First look for the form using the location attribute, if any
286:                        String formJXPath = input.attrs.getValue(LOCATION);
287:                        if (formJXPath != null) {
288:                            // remove the location attribute
289:                            AttributesImpl attrsCopy = new AttributesImpl(
290:                                    input.attrs);
291:                            attrsCopy.removeAttribute(input.attrs
292:                                    .getIndex(LOCATION));
293:                            input.attrs = attrsCopy;
294:                            input.mine = true;
295:                        }
296:                        contextWidget = pipeContext.findForm(formJXPath);
297:
298:                        // ====> Determine the Locale
299:                        //TODO pull this locale stuff also up in the Config object?
300:                        String localeAttr = input.attrs.getValue("locale");
301:                        if (localeAttr != null) { // first use value of locale attribute if any
302:                            localeAttr = pipeContext.translateText(localeAttr);
303:                            pipeContext.setLocale(I18nUtils
304:                                    .parseLocale(localeAttr));
305:                        } else if (pipeContext.getLocaleParameter() != null) { // then use locale specified as transformer parameter, if any
306:                            pipeContext.setLocale(pipeContext
307:                                    .getLocaleParameter());
308:                        } else {
309:                            //TODO pull this locale stuff also up in the Config object?
310:                            // use locale specified in bizdata supplied for form
311:                            Object locale = null;
312:                            try {
313:                                locale = pipeContext
314:                                        .evaluateExpression("/locale");
315:                            } catch (JXPathException e) {
316:                            }
317:                            if (locale != null) {
318:                                pipeContext.setLocale((Locale) locale);
319:                            } else {
320:                                // final solution: use locale defined in the server machine
321:                                pipeContext.setLocale(Locale.getDefault());
322:                            }
323:                        }
324:
325:                        String[] namesToTranslate = { "action" };
326:                        Attributes transAttrs = translateAttributes(
327:                                input.attrs, namesToTranslate);
328:                        out.element(Constants.WI_PREFIX, Constants.WI_NS,
329:                                "form-template", transAttrs);
330:                        out.startElement();
331:                        return this ;
332:                    case EVENT_ELEMENT:
333:                        return nestedTemplate();
334:                    case EVENT_END_ELEMENT:
335:                        out.copy();
336:                        out.endPrefixMapping(Constants.WI_PREFIX);
337:                        contextWidget = null;
338:                        return this ;
339:                    default:
340:                        out.copy();
341:                        return this ;
342:                    }
343:                }
344:            }
345:
346:            protected class NestedHandler extends Handler {
347:                public Handler process() throws SAXException {
348:                    switch (event) {
349:                    case EVENT_ELEMENT:
350:                        return nestedTemplate();
351:                    default:
352:                        out.copy();
353:                        return this ;
354:                    }
355:                }
356:            }
357:
358:            protected class WidgetLabelHandler extends Handler {
359:                public Handler process() throws SAXException {
360:                    switch (event) {
361:                    case EVENT_START_ELEMENT:
362:                        widgetId = getWidgetId(input.attrs);
363:                        Widget widget = getWidget(widgetId);
364:                        widget.generateLabel(getContentHandler());
365:                        widget = null;
366:                        return this ;
367:                    case EVENT_ELEMENT:
368:                        return nullHandler;
369:                    case EVENT_END_ELEMENT:
370:                        return this ;
371:                    default:
372:                        out.copy();
373:                        return this ;
374:                    }
375:                }
376:            }
377:
378:            protected class WidgetHandler extends Handler {
379:                public Handler process() throws SAXException {
380:                    switch (event) {
381:                    case EVENT_START_ELEMENT:
382:                        widgetId = getWidgetId(input.attrs);
383:                        widget = getWidget(widgetId);
384:                        gotStylingElement = false;
385:                        out.bufferInit();
386:                        return this ;
387:
388:                    case EVENT_ELEMENT:
389:                        if (Constants.WI_NS.equals(input.uri)
390:                                && STYLING_EL.equals(input.loc)) {
391:                            gotStylingElement = true;
392:                        }
393:                        return bufferHandler;
394:
395:                    case EVENT_END_ELEMENT:
396:                        stylingHandler.recycle();
397:                        stylingHandler.setSaxFragment(out.getBuffer());
398:                        stylingHandler.setContentHandler(getContentHandler());
399:                        stylingHandler.setLexicalHandler(getLexicalHandler());
400:                        widget.generateSaxFragment(stylingHandler, pipeContext
401:                                .getLocale());
402:                        widget = null;
403:                        out.bufferFini();
404:                        return this ;
405:
406:                    default:
407:                        out.copy();
408:                        return this ;
409:                    }
410:                }
411:            }
412:
413:            protected class RepeaterSizeHandler extends Handler {
414:                public Handler process() throws SAXException {
415:                    switch (event) {
416:                    case EVENT_START_ELEMENT:
417:                        getRepeaterWidget("RepeaterSizeHandler");
418:                        ((Repeater) widget).generateSize(getContentHandler());
419:                        widget = null;
420:                        return this ;
421:                    case EVENT_ELEMENT:
422:                        return nullHandler;
423:                    case EVENT_END_ELEMENT:
424:                        return this ;
425:                    default:
426:                        out.copy();
427:                        return this ;
428:                    }
429:                }
430:            }
431:
432:            protected class RepeaterWidgetLabelHandler extends Handler {
433:                public Handler process() throws SAXException {
434:                    switch (event) {
435:                    case EVENT_START_ELEMENT:
436:                        getRepeaterWidget("RepeaterWidgetLabelHandler");
437:                        String widgetId = input.attrs.getValue("widget-id");
438:                        if (widgetId == null || widgetId.length() == 0)
439:                            throwSAXException("Element repeater-widget-label missing required widget-id attribute.");
440:                        ((Repeater) widget).generateWidgetLabel(widgetId,
441:                                getContentHandler());
442:                        widget = null;
443:                        return this ;
444:                    case EVENT_ELEMENT:
445:                        return nullHandler;
446:                    case EVENT_END_ELEMENT:
447:                        return this ;
448:                    default:
449:                        out.copy();
450:                        return this ;
451:                    }
452:                }
453:            }
454:
455:            protected class RepeaterWidgetHandler extends Handler {
456:                public Handler process() throws SAXException {
457:                    switch (event) {
458:                    case EVENT_START_ELEMENT:
459:                        getRepeaterWidget("RepeaterWidgetHandler");
460:                        out.bufferInit();
461:                        return this ;
462:                    case EVENT_ELEMENT:
463:                        return bufferHandler;
464:                    case EVENT_END_ELEMENT:
465:                        Repeater repeater = (Repeater) widget;
466:                        int rowCount = repeater.getSize();
467:                        handlers.addFirst(handler);
468:                        handler = nestedHandler;
469:                        contextWidgets.addFirst(contextWidget);
470:                        for (int i = 0; i < rowCount; i++) {
471:                            Repeater.RepeaterRow row = repeater.getRow(i);
472:                            contextWidget = row;
473:                            out.getBuffer().toSAX(
474:                                    EffectWidgetReplacingPipe.this );
475:                        }
476:                        contextWidget = (Widget) contextWidgets.removeFirst();
477:                        handler = (Handler) handlers.removeFirst();
478:                        widget = null;
479:                        out.bufferFini();
480:                        return this ;
481:                    default:
482:                        out.buffer();
483:                        return this ;
484:                    }
485:                }
486:            }
487:
488:            protected class AggregateWidgetHandler extends Handler {
489:                public Handler process() throws SAXException {
490:                    switch (event) {
491:                    case EVENT_START_ELEMENT:
492:                        widgetId = getWidgetId(input.attrs);
493:                        widget = getWidget(widgetId);
494:                        if (!(widget instanceof  AggregateField)) {
495:                            throwWrongWidgetType("AggregateWidgetHandler",
496:                                    input.loc, "aggregate");
497:                        }
498:                        contextWidgets.addFirst(contextWidget);
499:                        contextWidget = widget;
500:                        return this ;
501:                    case EVENT_ELEMENT:
502:                        return nestedTemplate();
503:                    case EVENT_END_ELEMENT:
504:                        contextWidget = (Widget) contextWidgets.removeFirst();
505:                        return this ;
506:                    default:
507:                        out.copy();
508:                        return this ;
509:                    }
510:                }
511:            }
512:
513:            protected class StructHandler extends Handler {
514:                public Handler process() throws SAXException {
515:                    switch (event) {
516:                    case EVENT_START_ELEMENT:
517:                        widgetId = getWidgetId(input.attrs);
518:                        widget = getWidget(widgetId);
519:                        if (!(widget instanceof  Struct)) {
520:                            throwWrongWidgetType("StructHandler", input.loc,
521:                                    "struct");
522:                        }
523:                        contextWidgets.addFirst(contextWidget);
524:                        contextWidget = widget;
525:                        out.element(Constants.WI_PREFIX, Constants.WI_NS,
526:                                "struct");
527:                        out.attributes();
528:                        out.startElement();
529:                        return this ;
530:                    case EVENT_ELEMENT:
531:                        return nestedTemplate();
532:                    case EVENT_END_ELEMENT:
533:                        out.copy();
534:                        contextWidget = (Widget) contextWidgets.removeFirst();
535:                        return this ;
536:                    default:
537:                        out.copy();
538:                        return this ;
539:                    }
540:                }
541:            }
542:
543:            protected class UnionHandler extends Handler {
544:                public Handler process() throws SAXException {
545:                    switch (event) {
546:                    case EVENT_START_ELEMENT:
547:                        widgetId = getWidgetId(input.attrs);
548:                        widget = getWidget(widgetId);
549:                        if (!(widget instanceof  Union)) {
550:                            throwWrongWidgetType("UnionHandler", input.loc,
551:                                    "union");
552:                        }
553:                        contextWidgets.addFirst(contextWidget);
554:                        contextWidget = widget;
555:                        out.element(Constants.WI_PREFIX, Constants.WI_NS,
556:                                "union");
557:                        out.startElement();
558:                        return this ;
559:                    case EVENT_ELEMENT:
560:                        if (Constants.WT_NS.equals(input.uri)) {
561:                            if ("case".equals(input.loc)) {
562:                                String id = input.attrs.getValue("id");
563:                                if (id == null)
564:                                    throwSAXException("Element \"case\" missing required \"id\" attribute.");
565:                                String value = (String) contextWidget
566:                                        .getValue();
567:                                if (id.equals(value != null ? value : "")) {
568:                                    return nestedHandler;
569:                                } else {
570:                                    return nullHandler;
571:                                }
572:                            } else if (FORM_TEMPLATE_EL.equals(input.loc)) {
573:                                throwSAXException("Element \"form-template\" must not be nested.");
574:                            } else {
575:                                throwSAXException("Unrecognized template: "
576:                                        + input.loc);
577:                            }
578:                        } else {
579:                            return unionPassThruHandler;
580:                        }
581:                    case EVENT_END_ELEMENT:
582:                        out.endElement();
583:                        contextWidget = (Widget) contextWidgets.removeFirst();
584:                        return this ;
585:                    default:
586:                        out.copy();
587:                        return this ;
588:                    }
589:                }
590:            }
591:
592:            protected class UnionPassThruHandler extends Handler {
593:                public Handler process() throws SAXException {
594:                    switch (event) {
595:                    case EVENT_ELEMENT:
596:                        if (Constants.WT_NS.equals(input.uri)) {
597:                            if ("case".equals(input.loc)) {
598:                                if (contextWidget.getValue().equals(
599:                                        input.attrs.getValue("id"))) {
600:                                    return nestedHandler;
601:                                } else {
602:                                    return nullHandler;
603:                                }
604:                            } else if (FORM_TEMPLATE_EL.equals(input.loc)) {
605:                                throwSAXException("Element \"form-template\" must not be nested.");
606:                            } else {
607:                                throwSAXException("Unrecognized template: "
608:                                        + input.loc);
609:                            }
610:                        } else {
611:                            return this ;
612:                        }
613:                    default:
614:                        out.copy();
615:                        return this ;
616:                    }
617:                }
618:            }
619:
620:            protected class NewHandler extends Handler {
621:                public Handler process() throws SAXException {
622:                    switch (event) {
623:                    case EVENT_START_ELEMENT:
624:                        widgetId = getWidgetId(input.attrs);
625:                        SaxBuffer classBuffer = (SaxBuffer) classes
626:                                .get(widgetId);
627:                        if (classBuffer == null) {
628:                            throwSAXException("New: Class \"" + widgetId
629:                                    + "\" does not exist.");
630:                        }
631:                        handlers.addFirst(handler);
632:                        handler = nestedHandler;
633:                        classBuffer.toSAX(EffectWidgetReplacingPipe.this );
634:                        handler = (Handler) handlers.removeFirst();
635:                        return this ;
636:                    case EVENT_ELEMENT:
637:                        return nullHandler;
638:                    case EVENT_END_ELEMENT:
639:                        return this ;
640:                    default:
641:                        out.copy();
642:                        return this ;
643:                    }
644:                }
645:            }
646:
647:            protected class ClassHandler extends Handler {
648:                public Handler process() throws SAXException {
649:                    switch (event) {
650:                    case EVENT_START_ELEMENT:
651:                        widgetId = getWidgetId(input.attrs);
652:                        out.bufferInit();
653:                        return this ;
654:                    case EVENT_ELEMENT:
655:                        return bufferHandler;
656:                    case EVENT_END_ELEMENT:
657:                        classes.put(widgetId, out.getBuffer());
658:                        out.bufferFini();
659:                        return this ;
660:                    default:
661:                        out.buffer();
662:                        return this ;
663:                    }
664:                }
665:            }
666:
667:            protected class ContinuationIdHandler extends Handler {
668:                public Handler process() throws SAXException {
669:                    switch (event) {
670:                    case EVENT_START_ELEMENT:
671:                        // Insert the continuation id
672:                        // FIXME(SW) we could avoid costly JXPath evaluation if we had the objectmodel here.
673:                        Object idObj = pipeContext
674:                                .evaluateExpression("$continuation/id");
675:                        if (idObj == null) {
676:                            throwSAXException("No continuation found");
677:                        }
678:
679:                        String id = idObj.toString();
680:                        out.element(Constants.WI_PREFIX, Constants.WI_NS,
681:                                "continuation-id", input.attrs);
682:                        out.startElement();
683:                        out.characters(id.toCharArray(), 0, id.length());
684:                        out.endElement();
685:                        return this ;
686:                    case EVENT_END_ELEMENT:
687:                        return this ;
688:                    case EVENT_IGNORABLE_WHITESPACE:
689:                        return this ;
690:                    default:
691:                        throwSAXException("ContinuationIdHandler: No content allowed in \"continuation-id\" element");
692:                        return null; // Keep the compiler happy.
693:                    }
694:                }
695:            }
696:
697:            /**
698:             * This ContentHandler helps in inserting SAX events before the closing tag of the root
699:             * element.
700:             */
701:            protected class StylingContentHandler extends AbstractXMLPipe
702:                    implements  Recyclable {
703:                private int elementNesting;
704:                private SaxBuffer saxBuffer;
705:
706:                public void setSaxFragment(SaxBuffer saxFragment) {
707:                    saxBuffer = saxFragment;
708:                }
709:
710:                public void recycle() {
711:                    super .recycle();
712:                    elementNesting = 0;
713:                    saxBuffer = null;
714:                }
715:
716:                public void startElement(String uri, String loc, String raw,
717:                        Attributes a) throws SAXException {
718:                    elementNesting++;
719:                    super .startElement(uri, loc, raw, a);
720:                }
721:
722:                public void endElement(String uri, String loc, String raw)
723:                        throws SAXException {
724:                    elementNesting--;
725:                    if (elementNesting == 0 && saxBuffer != null) {
726:                        if (gotStylingElement) {
727:                            // Just deserialize
728:                            saxBuffer.toSAX(getContentHandler());
729:                        } else {
730:                            // Insert an enclosing <wi:styling>
731:                            out.startElement(Constants.WI_NS, STYLING_EL,
732:                                    Constants.WI_PREFIX_COLON + STYLING_EL,
733:                                    Constants.EMPTY_ATTRS);
734:                            saxBuffer.toSAX(getContentHandler());
735:                            out.endElement(Constants.WI_NS, STYLING_EL,
736:                                    Constants.WI_PREFIX_COLON + STYLING_EL);
737:                        }
738:                    }
739:                    super .endElement(uri, loc, raw);
740:                }
741:            }
742:
743:            /**
744:             * Inserts validation errors (if any) for the Field widgets
745:             */
746:            protected class ValidationErrorHandler extends Handler {
747:                public Handler process() throws SAXException {
748:                    switch (event) {
749:                    case EVENT_START_ELEMENT:
750:                        widgetId = getWidgetId(input.attrs);
751:                        widget = getWidget(widgetId);
752:                        out.bufferInit();
753:                        return this ;
754:
755:                    case EVENT_ELEMENT:
756:                        return bufferHandler;
757:
758:                    case EVENT_END_ELEMENT:
759:                        if (widget instanceof  ValidationErrorAware) {
760:                            ValidationError error = ((ValidationErrorAware) widget)
761:                                    .getValidationError();
762:                            if (error != null) {
763:                                out.startElement(Constants.WI_NS,
764:                                        VALIDATION_ERROR,
765:                                        Constants.WI_PREFIX_COLON
766:                                                + VALIDATION_ERROR,
767:                                        Constants.EMPTY_ATTRS);
768:                                error.generateSaxFragment(stylingHandler);
769:                                out.endElement(Constants.WI_NS,
770:                                        VALIDATION_ERROR,
771:                                        Constants.WI_PREFIX_COLON
772:                                                + VALIDATION_ERROR);
773:                            }
774:                        }
775:                        widget = null;
776:                        out.bufferFini();
777:                        return this ;
778:
779:                    default:
780:                        out.copy();
781:                        return this ;
782:                    }
783:                }
784:            }
785:
786:            private Attributes translateAttributes(Attributes attributes,
787:                    String[] names) {
788:                AttributesImpl newAtts = new AttributesImpl(attributes);
789:                if (names != null) {
790:                    for (int i = 0; i < names.length; i++) {
791:                        String name = names[i];
792:                        int position = newAtts.getIndex(name);
793:                        String newValue = pipeContext.translateText(newAtts
794:                                .getValue(position));
795:                        newAtts.setValue(position, newValue);
796:                    }
797:                }
798:                return newAtts;
799:            }
800:
801:            //    /**
802:            //     * Replaces JXPath expressions embedded inside #{ and } by their value.
803:            //     */
804:            //    private String translateText(String original) {
805:            //        StringBuffer expression;
806:            //        StringBuffer translated = new StringBuffer();
807:            //        StringReader in = new StringReader(original);
808:            //        int chr;
809:            //        try {
810:            //            while ((chr = in.read()) != -1) {
811:            //                char c = (char) chr;
812:            //                if (c == '#') {
813:            //                    chr = in.read();
814:            //                    if (chr != -1) {
815:            //                        c = (char) chr;
816:            //                        if (c == '{') {
817:            //                            expression = new StringBuffer();
818:            //                            boolean more = true;
819:            //                            while ( more ) {
820:            //                                more = false;
821:            //                                if ((chr = in.read()) != -1) {
822:            //                                    c = (char)chr;
823:            //                                    if (c != '}') {
824:            //                                        expression.append(c);
825:            //                                        more = true;
826:            //                                    } else {
827:            //                                        translated.append(evaluateExpression(expression.toString()));
828:            //                                    }
829:            //                                } else {
830:            //                                    translated.append('#').append('{').append(expression);
831:            //                                }
832:            //                            }
833:            //                        }
834:            //                    } else {
835:            //                        translated.append((char) chr);
836:            //                    }
837:            //                } else {
838:            //                    translated.append(c);
839:            //                }
840:            //            }
841:            //        } catch (IOException ignored) {
842:            //            ignored.printStackTrace();
843:            //        }
844:            //        return translated.toString();
845:            //    }
846:
847:            //    private String evaluateExpression(String expression) {
848:            //        return pipeContext.evaluateExpression(expression).toString();
849:            //    }
850:
851:            public void recycle() {
852:                super.recycle();
853:                this.contextWidget = null;
854:                this.widget = null;
855:                this.widgetId = null;
856:                this.pipeContext = null;
857:                this.namespacePrefix = null;
858:            }
859:        }
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