Source Code Cross Referenced for StdXMLReader.java in  » Parser » NanoXML » net » n3 » nanoxml » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Parser » NanoXML » net.n3.nanoxml 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* StdXMLReader.java                                               NanoXML/Java
002:         *
003:         * $Revision: 1.4 $
004:         * $Date: 2002/01/04 21:03:28 $
005:         * $Name: RELEASE_2_2_1 $
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.InputStream;
032:        import java.io.InputStreamReader;
033:        import java.io.IOException;
034:        import java.io.File;
035:        import java.io.FileInputStream;
036:        import java.io.FileNotFoundException;
037:        import java.io.LineNumberReader;
038:        import java.io.PushbackReader;
039:        import java.io.PushbackInputStream;
040:        import java.io.Reader;
041:        import java.io.StringReader;
042:        import java.io.UnsupportedEncodingException;
043:        import java.net.MalformedURLException;
044:        import java.net.URL;
045:        import java.util.Stack;
046:
047:        /**
048:         * StdXMLReader reads the data to be parsed.
049:         *
050:         * @author Marc De Scheemaecker
051:         * @version $Name: RELEASE_2_2_1 $, $Revision: 1.4 $
052:         */
053:        public class StdXMLReader implements  IXMLReader {
054:
055:            /**
056:             * A stacked reader.
057:             *
058:             * @author Marc De Scheemaecker
059:             * @version $Name: RELEASE_2_2_1 $, $Revision: 1.4 $
060:             */
061:            private class StackedReader {
062:
063:                PushbackReader pbReader;
064:
065:                LineNumberReader lineReader;
066:
067:                URL systemId;
068:
069:                String publicId;
070:
071:            }
072:
073:            /**
074:             * The stack of readers.
075:             */
076:            private Stack readers;
077:
078:            /**
079:             * The current push-back reader.
080:             */
081:            private StackedReader currentReader;
082:
083:            /**
084:             * Creates a new reader using a string as input.
085:             *
086:             * @param str the string containing the XML data
087:             */
088:            public static IXMLReader stringReader(String str) {
089:                return new StdXMLReader(new StringReader(str));
090:            }
091:
092:            /**
093:             * Creates a new reader using a file as input.
094:             *
095:             * @param filename the name of the file containing the XML data
096:             *
097:             * @throws java.io.FileNotFoundException
098:             *     if the file could not be found
099:             * @throws java.io.IOException
100:             *     if an I/O error occurred
101:             */
102:            public static IXMLReader fileReader(String filename)
103:                    throws FileNotFoundException, IOException {
104:                StdXMLReader r = new StdXMLReader(new FileInputStream(filename));
105:                r.setSystemID(filename);
106:
107:                for (int i = 0; i < r.readers.size(); i++) {
108:                    StackedReader sr = (StackedReader) r.readers.elementAt(i);
109:                    sr.systemId = r.currentReader.systemId;
110:                }
111:
112:                return r;
113:            }
114:
115:            /**
116:             * Initializes the reader from a system and public ID.
117:             *
118:             * @param publicID the public ID which may be null.
119:             * @param systemID the non-null system ID.
120:             *
121:             * @throws MalformedURLException
122:             *     if the system ID does not contain a valid URL
123:             * @throws FileNotFoundException
124:             *     if the system ID refers to a local file which does not exist
125:             * @throws IOException
126:             *     if an error occurred opening the stream
127:             */
128:            public StdXMLReader(String publicID, String systemID)
129:                    throws MalformedURLException, FileNotFoundException,
130:                    IOException {
131:                URL systemIDasURL = null;
132:
133:                try {
134:                    systemIDasURL = new URL(systemID);
135:                } catch (MalformedURLException e) {
136:                    systemID = "file:" + systemID;
137:
138:                    try {
139:                        systemIDasURL = new URL(systemID);
140:                    } catch (MalformedURLException e2) {
141:                        throw e;
142:                    }
143:                }
144:
145:                this .currentReader = new StackedReader();
146:                this .readers = new Stack();
147:                Reader reader = this .openStream(publicID, systemIDasURL
148:                        .toString());
149:                this .currentReader.lineReader = new LineNumberReader(reader);
150:                this .currentReader.pbReader = new PushbackReader(
151:                        this .currentReader.lineReader, 2);
152:            }
153:
154:            /**
155:             * Initializes the XML reader.
156:             *
157:             * @param reader the input for the XML data.
158:             */
159:            public StdXMLReader(Reader reader) {
160:                this .currentReader = new StackedReader();
161:                this .readers = new Stack();
162:                this .currentReader.lineReader = new LineNumberReader(reader);
163:                this .currentReader.pbReader = new PushbackReader(
164:                        this .currentReader.lineReader, 2);
165:                this .currentReader.publicId = "";
166:
167:                try {
168:                    this .currentReader.systemId = new URL("file:.");
169:                } catch (MalformedURLException e) {
170:                    // never happens
171:                }
172:            }
173:
174:            /**
175:             * Cleans up the object when it's destroyed.
176:             */
177:            protected void finalize() throws Throwable {
178:                this .currentReader.lineReader = null;
179:                this .currentReader.pbReader = null;
180:                this .currentReader.systemId = null;
181:                this .currentReader.publicId = null;
182:                this .currentReader = null;
183:                this .readers.clear();
184:                super .finalize();
185:            }
186:
187:            /**
188:             * Scans the encoding from an &lt;?xml...?&gt; tag.
189:             *
190:             * @param str the first tag in the XML data.
191:             *
192:             * @return the encoding, or null if no encoding has been specified.
193:             */
194:            protected String getEncoding(String str) {
195:                if (!str.startsWith("<?xml")) {
196:                    return null;
197:                }
198:
199:                int index = 5;
200:
201:                while (index < str.length()) {
202:                    StringBuffer key = new StringBuffer();
203:
204:                    while ((index < str.length()) && (str.charAt(index) <= ' ')) {
205:                        index++;
206:                    }
207:
208:                    while ((index < str.length()) && (str.charAt(index) >= 'a')
209:                            && (str.charAt(index) <= 'z')) {
210:                        key.append(str.charAt(index));
211:                        index++;
212:                    }
213:
214:                    while ((index < str.length()) && (str.charAt(index) <= ' ')) {
215:                        index++;
216:                    }
217:
218:                    if ((index >= str.length()) || (str.charAt(index) != '=')) {
219:                        break;
220:                    }
221:
222:                    while ((index < str.length())
223:                            && (str.charAt(index) != '\'')
224:                            && (str.charAt(index) != '"')) {
225:                        index++;
226:                    }
227:
228:                    if (index >= str.length()) {
229:                        break;
230:                    }
231:
232:                    char delimiter = str.charAt(index);
233:                    index++;
234:                    int index2 = str.indexOf(delimiter, index);
235:
236:                    if (index2 < 0) {
237:                        break;
238:                    }
239:
240:                    if (key.toString().equals("encoding")) {
241:                        return str.substring(index, index2);
242:                    }
243:
244:                    index = index2 + 1;
245:                }
246:
247:                return null;
248:            }
249:
250:            /**
251:             * Converts a stream to a reader while detecting the encoding.
252:             *
253:             * @param stream    the input for the XML data.
254:             * @param charsRead buffer where to put characters that have been read
255:             *
256:             * @throws java.io.IOException
257:             *     if an I/O error occurred
258:             */
259:            protected Reader stream2reader(InputStream stream,
260:                    StringBuffer charsRead) throws IOException {
261:                PushbackInputStream pbstream = new PushbackInputStream(stream);
262:                int b = pbstream.read();
263:
264:                switch (b) {
265:                case 0x00:
266:                case 0xFE:
267:                case 0xFF:
268:                    pbstream.unread(b);
269:                    return new InputStreamReader(pbstream, "UTF-16");
270:
271:                case 0xEF:
272:                    for (int i = 0; i < 2; i++) {
273:                        pbstream.read();
274:                    }
275:
276:                    return new InputStreamReader(pbstream, "UTF-8");
277:
278:                case 0x3C:
279:                    b = pbstream.read();
280:                    charsRead.append('<');
281:
282:                    while ((b > 0) && (b != 0x3E)) {
283:                        charsRead.append((char) b);
284:                        b = pbstream.read();
285:                    }
286:
287:                    if (b > 0) {
288:                        charsRead.append((char) b);
289:                    }
290:
291:                    String encoding = this .getEncoding(charsRead.toString());
292:
293:                    if (encoding == null) {
294:                        return new InputStreamReader(pbstream, "UTF-8");
295:                    }
296:
297:                    charsRead.setLength(0);
298:
299:                    try {
300:                        return new InputStreamReader(pbstream, encoding);
301:                    } catch (UnsupportedEncodingException e) {
302:                        return new InputStreamReader(pbstream, "UTF-8");
303:                    }
304:
305:                default:
306:                    charsRead.append((char) b);
307:                    return new InputStreamReader(pbstream, "UTF-8");
308:                }
309:            }
310:
311:            /**
312:             * Initializes the XML reader.
313:             *
314:             * @param stream the input for the XML data.
315:             *
316:             * @throws java.io.IOException
317:             *		if an I/O error occurred
318:             */
319:            public StdXMLReader(InputStream stream) throws IOException {
320:                PushbackInputStream pbstream = new PushbackInputStream(stream);
321:                StringBuffer charsRead = new StringBuffer();
322:                Reader reader = this .stream2reader(stream, charsRead);
323:                this .currentReader = new StackedReader();
324:                this .readers = new Stack();
325:                this .currentReader.lineReader = new LineNumberReader(reader);
326:                this .currentReader.pbReader = new PushbackReader(
327:                        this .currentReader.lineReader, 2);
328:                this .currentReader.publicId = "";
329:
330:                try {
331:                    this .currentReader.systemId = new URL("file:.");
332:                } catch (MalformedURLException e) {
333:                    // never happens
334:                }
335:
336:                this .startNewStream(new StringReader(charsRead.toString()));
337:            }
338:
339:            /**
340:             * Reads a character.
341:             *
342:             * @return the character
343:             *
344:             * @throws java.io.IOException
345:             *		if no character could be read
346:             */
347:            public char read() throws IOException {
348:                int ch = this .currentReader.pbReader.read();
349:
350:                while (ch < 0) {
351:                    if (this .readers.empty()) {
352:                        throw new IOException("Unexpected EOF");
353:                    }
354:
355:                    this .currentReader.pbReader.close();
356:                    this .currentReader = (StackedReader) this .readers.pop();
357:                    ch = this .currentReader.pbReader.read();
358:                }
359:
360:                return (char) ch;
361:            }
362:
363:            /**
364:             * Returns true if the current stream has no more characters left to be
365:             * read.
366:             *
367:             * @throws java.io.IOException
368:             *		if an I/O error occurred
369:             */
370:            public boolean atEOFOfCurrentStream() throws IOException {
371:                int ch = this .currentReader.pbReader.read();
372:
373:                if (ch < 0) {
374:                    return true;
375:                } else {
376:                    this .currentReader.pbReader.unread(ch);
377:                    return false;
378:                }
379:            }
380:
381:            /**
382:             * Returns true if there are no more characters left to be read.
383:             *
384:             * @throws java.io.IOException
385:             *		if an I/O error occurred
386:             */
387:            public boolean atEOF() throws IOException {
388:                int ch = this .currentReader.pbReader.read();
389:
390:                while (ch < 0) {
391:                    if (this .readers.empty()) {
392:                        return true;
393:                    }
394:
395:                    this .currentReader.pbReader.close();
396:                    this .currentReader = (StackedReader) this .readers.pop();
397:                    ch = this .currentReader.pbReader.read();
398:                }
399:
400:                this .currentReader.pbReader.unread(ch);
401:                return false;
402:            }
403:
404:            /**
405:             * Pushes the last character read back to the stream.
406:             *
407:             * @param ch the character to push back.
408:             *
409:             * @throws java.io.IOException
410:             *     if an I/O error occurred
411:             */
412:            public void unread(char ch) throws IOException {
413:                this .currentReader.pbReader.unread(ch);
414:            }
415:
416:            /**
417:             * Opens a stream from a public and system ID.
418:             *
419:             * @param publicID the public ID, which may be null
420:             * @param systemID the system ID, which is never null
421:             *
422:             * @throws java.net.MalformedURLException
423:             *     if the system ID does not contain a valid URL
424:             * @throws java.io.FileNotFoundException
425:             *     if the system ID refers to a local file which does not exist
426:             * @throws java.io.IOException
427:             *     if an error occurred opening the stream
428:             */
429:            public Reader openStream(String publicID, String systemID)
430:                    throws MalformedURLException, FileNotFoundException,
431:                    IOException {
432:                URL url = new URL(this .currentReader.systemId, systemID);
433:
434:                if (url.getRef() != null) {
435:                    String ref = url.getRef();
436:
437:                    if (url.getFile().length() > 0) {
438:                        url = new URL(url.getProtocol(), url.getHost(), url
439:                                .getPort(), url.getFile());
440:                        url = new URL("jar:" + url + '!' + ref);
441:                    } else {
442:                        url = StdXMLReader.class.getResource(ref);
443:                    }
444:                }
445:
446:                this .currentReader.publicId = publicID;
447:                this .currentReader.systemId = url;
448:                StringBuffer charsRead = new StringBuffer();
449:                Reader reader = this .stream2reader(url.openStream(), charsRead);
450:
451:                if (charsRead.length() == 0) {
452:                    return reader;
453:                }
454:
455:                String charsReadStr = charsRead.toString();
456:                PushbackReader pbreader = new PushbackReader(reader,
457:                        charsReadStr.length());
458:
459:                for (int i = charsReadStr.length() - 1; i >= 0; i--) {
460:                    pbreader.unread(charsReadStr.charAt(i));
461:                }
462:
463:                return pbreader;
464:            }
465:
466:            /**
467:             * Starts a new stream from a Java reader. The new stream is used
468:             * temporary to read data from. If that stream is exhausted, control
469:             * returns to the parent stream.
470:             *
471:             * @param reader the non-null reader to read the new data from
472:             */
473:            public void startNewStream(Reader reader) {
474:                this .startNewStream(reader, false);
475:            }
476:
477:            /**
478:             * Starts a new stream from a Java reader. The new stream is used
479:             * temporary to read data from. If that stream is exhausted, control
480:             * returns to the parent stream.
481:             *
482:             * @param reader the non-null reader to read the new data from
483:             * @param isInternalEntity true if the reader is produced by resolving
484:             *                         an internal entity
485:             */
486:            public void startNewStream(Reader reader, boolean isInternalEntity) {
487:                StackedReader oldReader = this .currentReader;
488:                this .readers.push(this .currentReader);
489:                this .currentReader = new StackedReader();
490:
491:                if (isInternalEntity) {
492:                    this .currentReader.lineReader = null;
493:                    this .currentReader.pbReader = new PushbackReader(reader, 2);
494:                } else {
495:                    this .currentReader.lineReader = new LineNumberReader(reader);
496:                    this .currentReader.pbReader = new PushbackReader(
497:                            this .currentReader.lineReader, 2);
498:                }
499:
500:                this .currentReader.systemId = oldReader.systemId;
501:                this .currentReader.publicId = oldReader.publicId;
502:            }
503:
504:            /**
505:             * Returns the current "level" of the stream on the stack of streams.
506:             */
507:            public int getStreamLevel() {
508:                return this .readers.size();
509:            }
510:
511:            /**
512:             * Returns the line number of the data in the current stream.
513:             */
514:            public int getLineNr() {
515:                if (this .currentReader.lineReader == null) {
516:                    StackedReader sr = (StackedReader) this .readers.peek();
517:
518:                    if (sr.lineReader == null) {
519:                        return 0;
520:                    } else {
521:                        return sr.lineReader.getLineNumber() + 1;
522:                    }
523:                }
524:
525:                return this .currentReader.lineReader.getLineNumber() + 1;
526:            }
527:
528:            /**
529:             * Sets the system ID of the current stream.
530:             *
531:             * @param systemID the system ID
532:             *
533:             * @throws java.net.MalformedURLException
534:             *     if the system ID does not contain a valid URL
535:             */
536:            public void setSystemID(String systemID)
537:                    throws MalformedURLException {
538:                this .currentReader.systemId = new URL(
539:                        this .currentReader.systemId, systemID);
540:            }
541:
542:            /**
543:             * Sets the public ID of the current stream.
544:             *
545:             * @param publicID the public ID
546:             */
547:            public void setPublicID(String publicID) {
548:                this .currentReader.publicId = publicID;
549:            }
550:
551:            /**
552:             * Returns the current system ID.
553:             */
554:            public String getSystemID() {
555:                return this .currentReader.systemId.toString();
556:            }
557:
558:            /**
559:             * Returns the current public ID.
560:             */
561:            public String getPublicID() {
562:                return this.currentReader.publicId;
563:            }
564:
565:        }
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