Source Code Cross Referenced for NonValidator.java in  » XML-UI » XUI » net » n3 » nanoxml » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » XML UI » XUI » net.n3.nanoxml 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* NonValidator.java                                               NanoXML/Java
002:         *
003:         * $Revision: 1.17 $
004:         * $Date: 2005/01/05 17:20:04 $
005:         * $Name:  $
006:         *
007:         * This file is part of NanoXML 2 for Java.
008:         * Copyright (C) 2000-2002 Marc De Scheemaecker, All Rights Reserved.
009:         *
010:         * This software is provided 'as-is', without any express or implied warranty.
011:         * In no event will the authors be held liable for any damages arising from the
012:         * use of this software.
013:         *
014:         * Permission is granted to anyone to use this software for any purpose,
015:         * including commercial applications, and to alter it and redistribute it
016:         * freely, subject to the following restrictions:
017:         *
018:         *  1. The origin of this software must not be misrepresented; you must not
019:         *     claim that you wrote the original software. If you use this software in
020:         *     a product, an acknowledgment in the product documentation would be
021:         *     appreciated but is not required.
022:         *
023:         *  2. Altered source versions must be plainly marked as such, and must not be
024:         *     misrepresented as being the original software.
025:         *
026:         *  3. This notice may not be removed or altered from any source distribution.
027:         */
028:
029:        package net.n3.nanoxml;
030:
031:        import java.io.Reader;
032:        import java.io.IOException;
033:        import java.io.StringReader;
034:        import java.util.Enumeration;
035:        import java.util.Hashtable;
036:        import java.util.Properties;
037:        import java.util.Stack;
038:
039:        /**
040:         * NonValidator is a concrete implementation of IXMLValidator which processes
041:         * the DTD and handles entity definitions. It does not do any validation
042:         * itself.
043:         *
044:         * @author Marc De Scheemaecker
045:         * @version $Name:  $, $Revision: 1.17 $
046:         */
047:        public class NonValidator implements  IXMLValidator {
048:
049:            /**
050:             * The parameter entity resolver.
051:             */
052:            protected IXMLEntityResolver parameterEntityResolver;
053:
054:            /**
055:             * Contains the default values for attributes for the different element
056:             * types.
057:             */
058:            protected Hashtable attributeDefaultValues;
059:
060:            /**
061:             * The stack of elements to be processed.
062:             */
063:            protected Stack currentElements;
064:
065:            /**
066:             * Creates the "validator".
067:             */
068:            public NonValidator() {
069:                this .attributeDefaultValues = new Hashtable();
070:                this .currentElements = new Stack();
071:                this .parameterEntityResolver = new XMLEntityResolver();
072:            }
073:
074:            /**
075:             * Cleans up the object when it's destroyed.
076:             */
077:            protected void finalize() throws Throwable {
078:                this .parameterEntityResolver = null;
079:                this .attributeDefaultValues.clear();
080:                this .attributeDefaultValues = null;
081:                this .currentElements.removeAllElements();
082:                this .currentElements = null;
083:                super .finalize();
084:            }
085:
086:            /**
087:             * Sets the parameter entity resolver.
088:             *
089:             * @param resolver the entity resolver.
090:             */
091:            public void setParameterEntityResolver(IXMLEntityResolver resolver) {
092:                this .parameterEntityResolver = resolver;
093:            }
094:
095:            /**
096:             * Returns the parameter entity resolver.
097:             *
098:             * @return the entity resolver.
099:             */
100:            public IXMLEntityResolver getParameterEntityResolver() {
101:                return this .parameterEntityResolver;
102:            }
103:
104:            /**
105:             * Parses the DTD. The validator object is responsible for reading the
106:             * full DTD.
107:             *
108:             * @param publicID       the public ID, which may be null.
109:             * @param reader         the reader to read the DTD from.
110:             * @param entityResolver the entity resolver.
111:             * @param external       true if the DTD is external.
112:             *
113:             * @throws java.lang.Exception
114:             *     If something went wrong.
115:             */
116:            public void parseDTD(String publicID, IXMLReader reader,
117:                    IXMLEntityResolver entityResolver, boolean external)
118:                    throws Exception {
119:                XMLUtil.skipWhitespace(reader, null);
120:                int origLevel = reader.getStreamLevel();
121:
122:                for (;;) {
123:                    String str = XMLUtil.read(reader, '%');
124:                    char ch = str.charAt(0);
125:
126:                    if (ch == '%') {
127:                        XMLUtil.processEntity(str, reader,
128:                                this .parameterEntityResolver);
129:                        continue;
130:                    } else if (ch == '<') {
131:                        this .processElement(reader, entityResolver);
132:                    } else if (ch == ']') {
133:                        return; // end internal DTD
134:                    } else {
135:                        XMLUtil.errorInvalidInput(reader.getSystemID(), reader
136:                                .getLineNr(), str);
137:                    }
138:
139:                    do {
140:                        ch = reader.read();
141:
142:                        if (external && (reader.getStreamLevel() < origLevel)) {
143:                            reader.unread(ch);
144:                            return; // end external DTD
145:                        }
146:                    } while ((ch == ' ') || (ch == '\t') || (ch == '\n')
147:                            || (ch == '\r'));
148:
149:                    reader.unread(ch);
150:                }
151:            }
152:
153:            /**
154:             * Processes an element in the DTD.
155:             *
156:             * @param reader         the reader to read data from.
157:             * @param entityResolver the entity resolver.
158:             *
159:             * @throws java.lang.Exception
160:             *     If something went wrong.
161:             */
162:            protected void processElement(IXMLReader reader,
163:                    IXMLEntityResolver entityResolver) throws Exception {
164:                String str = XMLUtil.read(reader, '%');
165:                char ch = str.charAt(0);
166:
167:                if (ch != '!') {
168:                    XMLUtil.skipTag(reader);
169:                    return;
170:                }
171:
172:                str = XMLUtil.read(reader, '%');
173:                ch = str.charAt(0);
174:
175:                switch (ch) {
176:                case '-':
177:                    XMLUtil.skipComment(reader);
178:                    break;
179:
180:                case '[':
181:                    this .processConditionalSection(reader, entityResolver);
182:                    break;
183:
184:                case 'E':
185:                    this .processEntity(reader, entityResolver);
186:                    break;
187:
188:                case 'A':
189:                    this .processAttList(reader, entityResolver);
190:                    break;
191:
192:                default:
193:                    XMLUtil.skipTag(reader);
194:                }
195:            }
196:
197:            /**
198:             * Processes a conditional section.
199:             *
200:             * @param reader         the reader to read data from.
201:             * @param entityResolver the entity resolver.
202:             *
203:             * @throws java.lang.Exception
204:             *     If something went wrong.
205:             */
206:            protected void processConditionalSection(IXMLReader reader,
207:                    IXMLEntityResolver entityResolver) throws Exception {
208:                XMLUtil.skipWhitespace(reader, null);
209:
210:                String str = XMLUtil.read(reader, '%');
211:                char ch = str.charAt(0);
212:
213:                if (ch != 'I') {
214:                    XMLUtil.skipTag(reader);
215:                    return;
216:                }
217:
218:                str = XMLUtil.read(reader, '%');
219:                ch = str.charAt(0);
220:
221:                switch (ch) {
222:                case 'G':
223:                    this .processIgnoreSection(reader, entityResolver);
224:                    return;
225:
226:                case 'N':
227:                    break;
228:
229:                default:
230:                    XMLUtil.skipTag(reader);
231:                    return;
232:                }
233:
234:                if (!XMLUtil.checkLiteral(reader, "CLUDE")) {
235:                    XMLUtil.skipTag(reader);
236:                    return;
237:                }
238:
239:                XMLUtil.skipWhitespace(reader, null);
240:
241:                str = XMLUtil.read(reader, '%');
242:                ch = str.charAt(0);
243:
244:                if (ch != '[') {
245:                    XMLUtil.skipTag(reader);
246:                    return;
247:                }
248:
249:                Reader subreader = new CDATAReader(reader);
250:                StringBuffer buf = new StringBuffer(1024);
251:
252:                for (;;) {
253:                    int ch2 = subreader.read();
254:
255:                    if (ch2 < 0) {
256:                        break;
257:                    }
258:
259:                    buf.append((char) ch2);
260:                }
261:
262:                subreader.close();
263:                reader.startNewStream(new StringReader(buf.toString()));
264:            }
265:
266:            /**
267:             * Processes an ignore section.
268:             *
269:             * @param reader         the reader to read data from.
270:             * @param entityResolver the entity resolver.
271:             *
272:             * @throws java.lang.Exception
273:             *     If something went wrong.
274:             */
275:            protected void processIgnoreSection(IXMLReader reader,
276:                    IXMLEntityResolver entityResolver) throws Exception {
277:                if (!XMLUtil.checkLiteral(reader, "NORE")) {
278:                    XMLUtil.skipTag(reader);
279:                    return;
280:                }
281:
282:                XMLUtil.skipWhitespace(reader, null);
283:
284:                String str = XMLUtil.read(reader, '%');
285:                char ch = str.charAt(0);
286:
287:                if (ch != '[') {
288:                    XMLUtil.skipTag(reader);
289:                    return;
290:                }
291:
292:                Reader subreader = new CDATAReader(reader);
293:                subreader.close();
294:            }
295:
296:            /**
297:             * Processes an ATTLIST element.
298:             *
299:             * @param reader         the reader to read data from.
300:             * @param entityResolver the entity resolver.
301:             *
302:             * @throws java.lang.Exception
303:             *     If something went wrong.
304:             */
305:            protected void processAttList(IXMLReader reader,
306:                    IXMLEntityResolver entityResolver) throws Exception {
307:                if (!XMLUtil.checkLiteral(reader, "TTLIST")) {
308:                    XMLUtil.skipTag(reader);
309:                    return;
310:                }
311:
312:                XMLUtil.skipWhitespace(reader, null);
313:                String str = XMLUtil.read(reader, '%');
314:                char ch = str.charAt(0);
315:                while (ch == '%') {
316:                    XMLUtil.processEntity(str, reader,
317:                            this .parameterEntityResolver);
318:                    str = XMLUtil.read(reader, '%');
319:                    ch = str.charAt(0);
320:                }
321:                reader.unread(ch);
322:                String elementName = XMLUtil.scanIdentifier(reader);
323:                XMLUtil.skipWhitespace(reader, null);
324:
325:                str = XMLUtil.read(reader, '%');
326:                ch = str.charAt(0);
327:                while (ch == '%') {
328:                    XMLUtil.processEntity(str, reader,
329:                            this .parameterEntityResolver);
330:                    str = XMLUtil.read(reader, '%');
331:                    ch = str.charAt(0);
332:                }
333:
334:                Properties props = new Properties();
335:
336:                while (ch != '>') {
337:                    reader.unread(ch);
338:                    String attName = XMLUtil.scanIdentifier(reader);
339:                    XMLUtil.skipWhitespace(reader, null);
340:                    str = XMLUtil.read(reader, '%');
341:                    ch = str.charAt(0);
342:                    while (ch == '%') {
343:                        XMLUtil.processEntity(str, reader,
344:                                this .parameterEntityResolver);
345:                        str = XMLUtil.read(reader, '%');
346:                        ch = str.charAt(0);
347:                    }
348:
349:                    if (ch == '(') {
350:                        while (ch != ')') {
351:                            str = XMLUtil.read(reader, '%');
352:                            ch = str.charAt(0);
353:                            while (ch == '%') {
354:                                XMLUtil.processEntity(str, reader,
355:                                        this .parameterEntityResolver);
356:                                str = XMLUtil.read(reader, '%');
357:                                ch = str.charAt(0);
358:                            }
359:                        }
360:                    } else {
361:                        reader.unread(ch);
362:                        XMLUtil.scanIdentifier(reader);
363:                    }
364:
365:                    XMLUtil.skipWhitespace(reader, null);
366:                    str = XMLUtil.read(reader, '%');
367:                    ch = str.charAt(0);
368:                    while (ch == '%') {
369:                        XMLUtil.processEntity(str, reader,
370:                                this .parameterEntityResolver);
371:                        str = XMLUtil.read(reader, '%');
372:                        ch = str.charAt(0);
373:                    }
374:
375:                    if (ch == '#') {
376:                        str = XMLUtil.scanIdentifier(reader);
377:                        XMLUtil.skipWhitespace(reader, null);
378:
379:                        if (!str.equals("FIXED")) {
380:                            XMLUtil.skipWhitespace(reader, null);
381:
382:                            str = XMLUtil.read(reader, '%');
383:                            ch = str.charAt(0);
384:                            while (ch == '%') {
385:                                XMLUtil.processEntity(str, reader,
386:                                        this .parameterEntityResolver);
387:                                str = XMLUtil.read(reader, '%');
388:                                ch = str.charAt(0);
389:                            }
390:
391:                            continue;
392:                        }
393:                    } else {
394:                        reader.unread(ch);
395:                    }
396:
397:                    String value = XMLUtil.scanString(reader, '%',
398:                            this .parameterEntityResolver);
399:                    props.put(attName, value);
400:                    XMLUtil.skipWhitespace(reader, null);
401:
402:                    str = XMLUtil.read(reader, '%');
403:                    ch = str.charAt(0);
404:                    while (ch == '%') {
405:                        XMLUtil.processEntity(str, reader,
406:                                this .parameterEntityResolver);
407:                        str = XMLUtil.read(reader, '%');
408:                        ch = str.charAt(0);
409:                    }
410:                }
411:
412:                if (!props.isEmpty()) {
413:                    this .attributeDefaultValues.put(elementName, props);
414:                }
415:            }
416:
417:            /**
418:             * Processes an ENTITY element.
419:             *
420:             * @param reader         the reader to read data from.
421:             * @param entityResolver the entity resolver.
422:             *
423:             * @throws java.lang.Exception
424:             *     If something went wrong.
425:             */
426:            protected void processEntity(IXMLReader reader,
427:                    IXMLEntityResolver entityResolver) throws Exception {
428:                if (!XMLUtil.checkLiteral(reader, "NTITY")) {
429:                    XMLUtil.skipTag(reader);
430:                    return;
431:                }
432:
433:                XMLUtil.skipWhitespace(reader, null);
434:                char ch = XMLUtil.readChar(reader, '\0');
435:
436:                if (ch == '%') {
437:                    XMLUtil.skipWhitespace(reader, null);
438:                    entityResolver = this .parameterEntityResolver;
439:                } else {
440:                    reader.unread(ch);
441:                }
442:
443:                String key = XMLUtil.scanIdentifier(reader);
444:                XMLUtil.skipWhitespace(reader, null);
445:                ch = XMLUtil.readChar(reader, '%');
446:                String systemID = null;
447:                String publicID = null;
448:
449:                switch (ch) {
450:                case 'P':
451:                    if (!XMLUtil.checkLiteral(reader, "UBLIC")) {
452:                        XMLUtil.skipTag(reader);
453:                        return;
454:                    }
455:
456:                    XMLUtil.skipWhitespace(reader, null);
457:                    publicID = XMLUtil.scanString(reader, '%',
458:                            this .parameterEntityResolver);
459:                    XMLUtil.skipWhitespace(reader, null);
460:                    systemID = XMLUtil.scanString(reader, '%',
461:                            this .parameterEntityResolver);
462:                    XMLUtil.skipWhitespace(reader, null);
463:                    XMLUtil.readChar(reader, '%');
464:                    break;
465:
466:                case 'S':
467:                    if (!XMLUtil.checkLiteral(reader, "YSTEM")) {
468:                        XMLUtil.skipTag(reader);
469:                        return;
470:                    }
471:
472:                    XMLUtil.skipWhitespace(reader, null);
473:                    systemID = XMLUtil.scanString(reader, '%',
474:                            this .parameterEntityResolver);
475:                    XMLUtil.skipWhitespace(reader, null);
476:                    XMLUtil.readChar(reader, '%');
477:                    break;
478:
479:                case '"':
480:                case '\'':
481:                    reader.unread(ch);
482:                    String value = XMLUtil.scanString(reader, '%',
483:                            this .parameterEntityResolver);
484:                    entityResolver.addInternalEntity(key, value);
485:                    XMLUtil.skipWhitespace(reader, null);
486:                    XMLUtil.readChar(reader, '%');
487:                    break;
488:
489:                default:
490:                    XMLUtil.skipTag(reader);
491:                }
492:
493:                if (systemID != null) {
494:                    entityResolver.addExternalEntity(key, publicID, systemID);
495:                }
496:            }
497:
498:            /**
499:             * Indicates that an element has been started.
500:             *
501:             * @param name       the name of the element.
502:             * @param systemId   the system ID of the XML data of the element.
503:             * @param lineNr     the line number in the XML data of the element.
504:             */
505:            public void elementStarted(String name, String systemId, int lineNr) {
506:                Properties attribs = (Properties) this .attributeDefaultValues
507:                        .get(name);
508:
509:                if (attribs == null) {
510:                    attribs = new Properties();
511:                } else {
512:                    attribs = (Properties) attribs.clone();
513:                }
514:
515:                this .currentElements.push(attribs);
516:            }
517:
518:            /**
519:             * Indicates that the current element has ended.
520:             *
521:             * @param name       the name of the element.
522:             * @param systemId   the system ID of the XML data of the element.
523:             * @param lineNr     the line number in the XML data of the element.
524:             */
525:            public void elementEnded(String name, String systemId, int lineNr) {
526:                // nothing to do
527:            }
528:
529:            /**
530:             * This method is called when the attributes of an XML element have been
531:             * processed.
532:             * If there are attributes with a default value which have not been
533:             * specified yet, they have to be put into <I>extraAttributes</I>.
534:             *
535:             * @param name            the name of the element.
536:             * @param extraAttributes where to put extra attributes.
537:             * @param systemId        the system ID of the XML data of the element.
538:             * @param lineNr          the line number in the XML data of the element.
539:             */
540:            public void elementAttributesProcessed(String     name,
541:                                          Properties extraAttributes,
542:                                          String     systemId,
543:                                          int        lineNr)
544:   {
545:      Properties props = (Properties) this .currentElements.pop();
546:      Enumeration enum = props.keys();
547:
548:      while (enum.hasMoreElements()) {
549:         String key = (String) enum.nextElement();
550:         extraAttributes.put(key, props.get(key));
551:      }
552:   }
553:
554:            /**
555:             * Indicates that an attribute has been added to the current element.
556:             *
557:             * @param key        the name of the attribute.
558:             * @param value      the value of the attribute.
559:             * @param systemId   the system ID of the XML data of the element.
560:             * @param lineNr     the line number in the XML data of the element.
561:             */
562:            public void attributeAdded(String key, String value,
563:                    String systemId, int lineNr) {
564:                Properties props = (Properties) this .currentElements.peek();
565:
566:                if (props.containsKey(key)) {
567:                    props.remove(key);
568:                }
569:            }
570:
571:            /**
572:             * Indicates that a new #PCDATA element has been encountered.
573:             *
574:             * @param systemId the system ID of the XML data of the element.
575:             * @param lineNr   the line number in the XML data of the element.
576:             */
577:            public void PCDataAdded(String systemId, int lineNr) {
578:                // nothing to do
579:            }
580:
581:        }
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