Source Code Cross Referenced for XmlElement.java in  » Development » jrc-editor » org » zaval » xml » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Development » jrc editor » org.zaval.xml 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:            This code based upon NanoXML 2.2 sources
003:         */
004:
005:        package org.zaval.xml;
006:
007:        import java.io.*;
008:        import java.util.*;
009:
010:        public class XmlElement {
011:            static final long serialVersionUID = 6685035139346394777L;
012:            public static final int NANOXML_MAJOR_VERSION = 2;
013:            public static final int NANOXML_MINOR_VERSION = 2;
014:
015:            private Hashtable attributes;
016:            private Vector children;
017:            private String name;
018:            private String contents;
019:            private Hashtable entities;
020:
021:            private int lineNr;
022:            private boolean ignoreCase;
023:            private boolean ignoreWhitespace;
024:            private char charReadTooMuch;
025:            private Reader reader;
026:            private int parserLineNr;
027:
028:            public XmlElement() {
029:                this (new Hashtable(), false, true, true);
030:            }
031:
032:            public XmlElement(Hashtable entities) {
033:                this (entities, false, true, true);
034:            }
035:
036:            public XmlElement(boolean skipLeadingWhitespace) {
037:                this (new Hashtable(), skipLeadingWhitespace, true, true);
038:            }
039:
040:            public XmlElement(Hashtable entities, boolean skipLeadingWhitespace) {
041:                this (entities, skipLeadingWhitespace, true, true);
042:            }
043:
044:            public XmlElement(Hashtable entities,
045:                    boolean skipLeadingWhitespace, boolean ignoreCase) {
046:                this (entities, skipLeadingWhitespace, true, ignoreCase);
047:            }
048:
049:            protected XmlElement(Hashtable entities,
050:                         boolean   skipLeadingWhitespace,
051:                         boolean   fillBasicConversionTable,
052:                         boolean   ignoreCase)
053:    {
054:        this .ignoreWhitespace = skipLeadingWhitespace;
055:        this .ignoreCase = ignoreCase;
056:        this .name = null;
057:        this .contents = "";
058:        this .attributes = new Hashtable();
059:        this .children = new Vector();
060:        this .entities = entities;
061:        this .lineNr = 0;
062:        Enumeration enum = this .entities.keys();
063:        while (enum.hasMoreElements()) {
064:            Object key = enum.nextElement();
065:            Object value = this .entities.get(key);
066:            if (value instanceof  String) {
067:                value = ((String) value).toCharArray();
068:                this .entities.put(key, value);
069:            }
070:        }
071:        if (fillBasicConversionTable) {
072:            this .entities.put("amp", new char[] { '&' });
073:            this .entities.put("quot", new char[] { '"' });
074:            this .entities.put("apos", new char[] { '\'' });
075:            this .entities.put("lt", new char[] { '<' });
076:            this .entities.put("gt", new char[] { '>' });
077:        }
078:    }
079:
080:            public void addChild(XmlElement child) {
081:                this .children.addElement(child);
082:            }
083:
084:            public void setAttribute(String name, Object value) {
085:                if (this .ignoreCase) {
086:                    name = name.toLowerCase();
087:                }
088:                this .attributes.put(name, value.toString());
089:            }
090:
091:            public int countChildren() {
092:                return this .children.size();
093:            }
094:
095:            public Enumeration enumerateAttributeNames() {
096:                return this .attributes.keys();
097:            }
098:
099:            public Enumeration enumerateChildren() {
100:                return this .children.elements();
101:            }
102:
103:            public Vector getChildren() {
104:                try {
105:                    return (Vector) this .children.clone();
106:                } catch (Exception e) {
107:                    // this never happens, however, some Java compilers are so
108:                    // braindead that they require this exception clause
109:                    return null;
110:                }
111:            }
112:
113:            public String getContents() {
114:                return this .getContent();
115:            }
116:
117:            public String getContent() {
118:                return this .contents;
119:            }
120:
121:            public int getLineNr() {
122:                return this .lineNr;
123:            }
124:
125:            public Object getAttribute(String name) {
126:                return this .getAttribute(name, null);
127:            }
128:
129:            public Object getAttribute(String name, Object defaultValue) {
130:                if (this .ignoreCase) {
131:                    name = name.toLowerCase();
132:                }
133:                Object value = this .attributes.get(name);
134:                if (value == null) {
135:                    value = defaultValue;
136:                }
137:                return value;
138:            }
139:
140:            public Object getAttribute(String name, Hashtable valueSet,
141:                    String defaultKey, boolean allowLiterals) {
142:                if (this .ignoreCase) {
143:                    name = name.toLowerCase();
144:                }
145:                Object key = this .attributes.get(name);
146:                Object result;
147:                if (key == null) {
148:                    key = defaultKey;
149:                }
150:                result = valueSet.get(key);
151:                if (result == null) {
152:                    if (allowLiterals) {
153:                        result = key;
154:                    } else {
155:                        throw this .invalidValue(name, (String) key);
156:                    }
157:                }
158:                return result;
159:            }
160:
161:            public String getName() {
162:                return this .name;
163:            }
164:
165:            public String getTagName() {
166:                return this .getName();
167:            }
168:
169:            public void parse(Reader reader) throws IOException,
170:                    XmlParseException {
171:                this .parse(reader, /*startingLineNr*/1);
172:            }
173:
174:            public void parse(Reader reader, int startingLineNr)
175:                    throws IOException, XmlParseException {
176:                this .charReadTooMuch = '\0';
177:                this .reader = reader;
178:                this .parserLineNr = startingLineNr;
179:
180:                for (;;) {
181:                    char ch = this .scanWhitespace();
182:
183:                    if (ch != '<') {
184:                        throw this .expectedInput("<");
185:                    }
186:
187:                    ch = this .readChar();
188:
189:                    if ((ch == '!') || (ch == '?')) {
190:                        this .skipSpecialTag(0);
191:                    } else {
192:                        this .unreadChar(ch);
193:                        this .scanElement(this );
194:                        return;
195:                    }
196:                }
197:            }
198:
199:            public void parse(String string) throws XmlParseException {
200:                try {
201:                    this .parse(new StringReader(string), 1);
202:                } catch (IOException e) {
203:                }
204:            }
205:
206:            public void removeChild(XmlElement child) {
207:                this .children.removeElement(child);
208:            }
209:
210:            public void removeAttribute(String name) {
211:                if (this .ignoreCase) {
212:                    name = name.toLowerCase();
213:                }
214:                this .attributes.remove(name);
215:            }
216:
217:            public void removeChild(String name) {
218:                this .removeAttribute(name);
219:            }
220:
221:            protected XmlElement createAnotherElement() {
222:                return new XmlElement(this .entities, this .ignoreWhitespace,
223:                        false, this .ignoreCase);
224:            }
225:
226:            public void setContent(String content) {
227:                this .contents = content;
228:            }
229:
230:            public void setTagName(String name) {
231:                this .setName(name);
232:            }
233:
234:            public void setName(String name) {
235:                this .name = name;
236:            }
237:
238:            public String toString() {
239:                try {
240:                    ByteArrayOutputStream out = new ByteArrayOutputStream();
241:                    this .write(new PrintStream(out));
242:                    out.flush();
243:                    return new String(out.toByteArray(), 0);
244:                } catch (IOException e) {
245:                    // Java exception handling suxx
246:                    return super .toString();
247:                }
248:            }
249:
250:            public void write(PrintStream writer)
251:        throws IOException
252:    {
253:        if (this .name == null) {
254:            this .writeEncoded(writer, this .contents);
255:            return;
256:        }
257:        writer.print('<');
258:        writer.print(this .name);
259:        if (! this .attributes.isEmpty()) {
260:            Enumeration enum = this .attributes.keys();
261:            while (enum.hasMoreElements()) {
262:                writer.print(' ');
263:                String key = (String) enum.nextElement();
264:                String value = (String) this .attributes.get(key);
265:                writer.print(key);
266:                writer.print('='); writer.write('"');
267:                this .writeEncoded(writer, value);
268:                writer.write('"');
269:            }
270:        }
271:        if ((this .contents != null) && (this .contents.length() > 0)) {
272:            writer.print('>');
273:            this .writeEncoded(writer, this .contents);
274:            writer.print('<'); writer.print('/');
275:            writer.print(this .name);
276:            writer.write('>');
277:        } else if (this .children.isEmpty()) {
278:            writer.print('/'); writer.print('>');
279:        } else {
280:            writer.print('>');
281:            Enumeration enum = this .enumerateChildren();
282:            while (enum.hasMoreElements()) {
283:                XmlElement child = (XmlElement) enum.nextElement();
284:                child.write(writer);
285:            }
286:            writer.print('<'); writer.print('/');
287:            writer.print(this .name);
288:            writer.print('>');
289:        }
290:    }
291:
292:            protected void writeEncoded(PrintStream writer, String str)
293:                    throws IOException {
294:                for (int i = 0; i < str.length(); i += 1) {
295:                    char ch = str.charAt(i);
296:                    switch (ch) {
297:                    case '<':
298:                        writer.write('&');
299:                        writer.write('l');
300:                        writer.write('t');
301:                        writer.write(';');
302:                        break;
303:                    case '>':
304:                        writer.write('&');
305:                        writer.write('g');
306:                        writer.write('t');
307:                        writer.write(';');
308:                        break;
309:                    case '&':
310:                        writer.write('&');
311:                        writer.write('a');
312:                        writer.write('m');
313:                        writer.write('p');
314:                        writer.write(';');
315:                        break;
316:                    case '"':
317:                        writer.write('&');
318:                        writer.write('q');
319:                        writer.write('u');
320:                        writer.write('o');
321:                        writer.write('t');
322:                        writer.write(';');
323:                        break;
324:                    case '\'':
325:                        writer.write('&');
326:                        writer.write('a');
327:                        writer.write('p');
328:                        writer.write('o');
329:                        writer.write('s');
330:                        writer.write(';');
331:                        break;
332:                    default:
333:                        int unicode = (int) ch;
334:                        if ((unicode < 32) || (unicode > 126)) {
335:                            writer.write('&');
336:                            writer.write('#');
337:                            writer.write('x');
338:                            writer.print(Integer.toString(unicode, 16));
339:                            writer.write(';');
340:                        } else {
341:                            writer.write(ch);
342:                        }
343:                    }
344:                }
345:            }
346:
347:            protected void scanIdentifier(StringBuffer result)
348:                    throws IOException {
349:                for (;;) {
350:                    char ch = this .readChar();
351:                    if (((ch < 'A') || (ch > 'Z'))
352:                            && ((ch < 'a') || (ch > 'z'))
353:                            && ((ch < '0') || (ch > '9')) && (ch != '_')
354:                            && (ch != '.') && (ch != ':') && (ch != '-')
355:                            && (ch <= '\u007E')) {
356:                        this .unreadChar(ch);
357:                        return;
358:                    }
359:                    result.append(ch);
360:                }
361:            }
362:
363:            protected char scanWhitespace() throws IOException {
364:                for (;;) {
365:                    char ch = this .readChar();
366:                    switch (ch) {
367:                    case ' ':
368:                    case '\t':
369:                    case '\n':
370:                    case '\r':
371:                        break;
372:                    default:
373:                        return ch;
374:                    }
375:                }
376:            }
377:
378:            protected char scanWhitespace(StringBuffer result)
379:                    throws IOException {
380:                for (;;) {
381:                    char ch = this .readChar();
382:                    switch (ch) {
383:                    case ' ':
384:                    case '\t':
385:                    case '\n':
386:                        result.append(ch);
387:                    case '\r':
388:                        break;
389:                    default:
390:                        return ch;
391:                    }
392:                }
393:            }
394:
395:            protected void scanString(StringBuffer string) throws IOException {
396:                char delimiter = this .readChar();
397:                if ((delimiter != '\'') && (delimiter != '"')) {
398:                    throw this .expectedInput("' or \"");
399:                }
400:                for (;;) {
401:                    char ch = this .readChar();
402:                    if (ch == delimiter) {
403:                        return;
404:                    } else if (ch == '&') {
405:                        this .resolveEntity(string);
406:                    } else {
407:                        string.append(ch);
408:                    }
409:                }
410:            }
411:
412:            protected void scanPCData(StringBuffer data) throws IOException {
413:                for (;;) {
414:                    char ch = this .readChar();
415:                    if (ch == '<') {
416:                        ch = this .readChar();
417:                        if (ch == '!') {
418:                            this .checkCDATA(data);
419:                        } else {
420:                            this .unreadChar(ch);
421:                            return;
422:                        }
423:                    } else if (ch == '&') {
424:                        this .resolveEntity(data);
425:                    } else {
426:                        data.append(ch);
427:                    }
428:                }
429:            }
430:
431:            protected boolean checkCDATA(StringBuffer buf) throws IOException {
432:                char ch = this .readChar();
433:                if (ch != '[') {
434:                    this .unreadChar(ch);
435:                    this .skipSpecialTag(0);
436:                    return false;
437:                } else if (!this .checkLiteral("CDATA[")) {
438:                    this .skipSpecialTag(1); // one [ has already been read
439:                    return false;
440:                } else {
441:                    int delimiterCharsSkipped = 0;
442:                    while (delimiterCharsSkipped < 3) {
443:                        ch = this .readChar();
444:                        switch (ch) {
445:                        case ']':
446:                            if (delimiterCharsSkipped < 2) {
447:                                delimiterCharsSkipped += 1;
448:                            } else {
449:                                buf.append(']');
450:                                buf.append(']');
451:                                delimiterCharsSkipped = 0;
452:                            }
453:                            break;
454:                        case '>':
455:                            if (delimiterCharsSkipped < 2) {
456:                                for (int i = 0; i < delimiterCharsSkipped; i++) {
457:                                    buf.append(']');
458:                                }
459:                                delimiterCharsSkipped = 0;
460:                                buf.append('>');
461:                            } else {
462:                                delimiterCharsSkipped = 3;
463:                            }
464:                            break;
465:                        default:
466:                            for (int i = 0; i < delimiterCharsSkipped; i += 1) {
467:                                buf.append(']');
468:                            }
469:                            buf.append(ch);
470:                            delimiterCharsSkipped = 0;
471:                        }
472:                    }
473:                    return true;
474:                }
475:            }
476:
477:            protected void skipComment() throws IOException {
478:                int dashesToRead = 2;
479:                while (dashesToRead > 0) {
480:                    char ch = this .readChar();
481:                    if (ch == '-') {
482:                        dashesToRead -= 1;
483:                    } else {
484:                        dashesToRead = 2;
485:                    }
486:                }
487:                if (this .readChar() != '>') {
488:                    throw this .expectedInput(">");
489:                }
490:            }
491:
492:            protected void skipSpecialTag(int bracketLevel) throws IOException {
493:                int tagLevel = 1; // <
494:                char stringDelimiter = '\0';
495:                if (bracketLevel == 0) {
496:                    char ch = this .readChar();
497:                    if (ch == '[') {
498:                        bracketLevel += 1;
499:                    } else if (ch == '-') {
500:                        ch = this .readChar();
501:                        if (ch == '[') {
502:                            bracketLevel += 1;
503:                        } else if (ch == ']') {
504:                            bracketLevel -= 1;
505:                        } else if (ch == '-') {
506:                            this .skipComment();
507:                            return;
508:                        }
509:                    }
510:                }
511:                while (tagLevel > 0) {
512:                    char ch = this .readChar();
513:                    if (stringDelimiter == '\0') {
514:                        if ((ch == '"') || (ch == '\'')) {
515:                            stringDelimiter = ch;
516:                        } else if (bracketLevel <= 0) {
517:                            if (ch == '<') {
518:                                tagLevel += 1;
519:                            } else if (ch == '>') {
520:                                tagLevel -= 1;
521:                            }
522:                        }
523:                        if (ch == '[') {
524:                            bracketLevel += 1;
525:                        } else if (ch == ']') {
526:                            bracketLevel -= 1;
527:                        }
528:                    } else {
529:                        if (ch == stringDelimiter) {
530:                            stringDelimiter = '\0';
531:                        }
532:                    }
533:                }
534:            }
535:
536:            protected boolean checkLiteral(String literal) throws IOException {
537:                int length = literal.length();
538:                for (int i = 0; i < length; i += 1) {
539:                    if (this .readChar() != literal.charAt(i)) {
540:                        return false;
541:                    }
542:                }
543:                return true;
544:            }
545:
546:            protected char readChar() throws IOException {
547:                if (this .charReadTooMuch != '\0') {
548:                    char ch = this .charReadTooMuch;
549:                    this .charReadTooMuch = '\0';
550:                    return ch;
551:                } else {
552:                    int i = this .reader.read();
553:                    if (i < 0) {
554:                        throw this .unexpectedEndOfData();
555:                    } else if (i == 10) {
556:                        this .parserLineNr += 1;
557:                        return '\n';
558:                    } else {
559:                        return (char) i;
560:                    }
561:                }
562:            }
563:
564:            protected void scanElement(XmlElement elt) throws IOException {
565:                StringBuffer buf = new StringBuffer();
566:                this .scanIdentifier(buf);
567:                String name = buf.toString();
568:                elt.setName(name);
569:                char ch = this .scanWhitespace();
570:                while ((ch != '>') && (ch != '/')) {
571:                    buf.setLength(0);
572:                    this .unreadChar(ch);
573:                    this .scanIdentifier(buf);
574:                    String key = buf.toString();
575:                    ch = this .scanWhitespace();
576:                    if (ch != '=') {
577:                        throw this .expectedInput("=");
578:                    }
579:                    this .unreadChar(this .scanWhitespace());
580:                    buf.setLength(0);
581:                    this .scanString(buf);
582:                    elt.setAttribute(key, buf);
583:                    ch = this .scanWhitespace();
584:                }
585:                if (ch == '/') {
586:                    ch = this .readChar();
587:                    if (ch != '>') {
588:                        throw this .expectedInput(">");
589:                    }
590:                    return;
591:                }
592:                buf.setLength(0);
593:                ch = this .scanWhitespace(buf);
594:                if (ch != '<') {
595:                    this .unreadChar(ch);
596:                    this .scanPCData(buf);
597:                } else {
598:                    for (;;) {
599:                        ch = this .readChar();
600:                        if (ch == '!') {
601:                            if (this .checkCDATA(buf)) {
602:                                this .scanPCData(buf);
603:                                break;
604:                            } else {
605:                                ch = this .scanWhitespace(buf);
606:                                if (ch != '<') {
607:                                    this .unreadChar(ch);
608:                                    this .scanPCData(buf);
609:                                    break;
610:                                }
611:                            }
612:                        } else {
613:                            buf.setLength(0);
614:                            break;
615:                        }
616:                    }
617:                }
618:                if (buf.length() == 0) {
619:                    while (ch != '/') {
620:                        if (ch == '!') {
621:                            ch = this .readChar();
622:                            if (ch != '-') {
623:                                throw this .expectedInput("Comment or Element");
624:                            }
625:                            ch = this .readChar();
626:                            if (ch != '-') {
627:                                throw this .expectedInput("Comment or Element");
628:                            }
629:                            this .skipComment();
630:                        } else {
631:                            this .unreadChar(ch);
632:                            XmlElement child = this .createAnotherElement();
633:                            this .scanElement(child);
634:                            elt.addChild(child);
635:                        }
636:                        ch = this .scanWhitespace();
637:                        if (ch != '<') {
638:                            throw this .expectedInput("<");
639:                        }
640:                        ch = this .readChar();
641:                    }
642:                    this .unreadChar(ch);
643:                } else {
644:                    if (this .ignoreWhitespace) {
645:                        elt.setContent(buf.toString().trim());
646:                    } else {
647:                        elt.setContent(buf.toString());
648:                    }
649:                }
650:                ch = this .readChar();
651:                if (ch != '/') {
652:                    throw this .expectedInput("/");
653:                }
654:                this .unreadChar(this .scanWhitespace());
655:                if (!this .checkLiteral(name)) {
656:                    throw this .expectedInput(name);
657:                }
658:                if (this .scanWhitespace() != '>') {
659:                    throw this .expectedInput(">");
660:                }
661:            }
662:
663:            protected void resolveEntity(StringBuffer buf) throws IOException {
664:                char ch = '\0';
665:                StringBuffer keyBuf = new StringBuffer();
666:                for (;;) {
667:                    ch = this .readChar();
668:                    if (ch == ';') {
669:                        break;
670:                    }
671:                    keyBuf.append(ch);
672:                }
673:                String key = keyBuf.toString();
674:                if (key.charAt(0) == '#') {
675:                    try {
676:                        if (key.charAt(1) == 'x') {
677:                            ch = (char) Integer.parseInt(key.substring(2), 16);
678:                        } else {
679:                            ch = (char) Integer.parseInt(key.substring(1), 10);
680:                        }
681:                    } catch (NumberFormatException e) {
682:                        throw this .unknownEntity(key);
683:                    }
684:                    buf.append(ch);
685:                } else {
686:                    char[] value = (char[]) this .entities.get(key);
687:                    if (value == null) {
688:                        throw this .unknownEntity(key);
689:                    }
690:                    buf.append(value);
691:                }
692:            }
693:
694:            protected void unreadChar(char ch) {
695:                this .charReadTooMuch = ch;
696:            }
697:
698:            protected XmlParseException invalidValueSet(String name) {
699:                String msg = "Invalid value set (entity name = \"" + name
700:                        + "\")";
701:                return new XmlParseException(this .getName(), this .parserLineNr,
702:                        msg);
703:            }
704:
705:            protected XmlParseException invalidValue(String name, String value) {
706:                String msg = "Attribute \"" + name
707:                        + "\" does not contain a valid " + "value (\"" + value
708:                        + "\")";
709:                return new XmlParseException(this .getName(), this .parserLineNr,
710:                        msg);
711:            }
712:
713:            protected XmlParseException unexpectedEndOfData() {
714:                String msg = "Unexpected end of data reached";
715:                return new XmlParseException(this .getName(), this .parserLineNr,
716:                        msg);
717:            }
718:
719:            protected XmlParseException syntaxError(String context) {
720:                String msg = "Syntax error while parsing " + context;
721:                return new XmlParseException(this .getName(), this .parserLineNr,
722:                        msg);
723:            }
724:
725:            protected XmlParseException expectedInput(String charSet) {
726:                String msg = "Expected: " + charSet;
727:                return new XmlParseException(this .getName(), this .parserLineNr,
728:                        msg);
729:            }
730:
731:            protected XmlParseException unknownEntity(String name) {
732:                String msg = "Unknown or invalid entity: &" + name + ";";
733:                return new XmlParseException(this.getName(), this.parserLineNr,
734:                        msg);
735:            }
736:        }
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