Source Code Cross Referenced for PatternAutomatonBuilder.java in  » Parser » chaperon-3.0 » net » sourceforge » chaperon » build » Java Source Code / Java DocumentationJava Source Code and Java Documentation

Java Source Code / Java Documentation
1. 6.0 JDK Core
2. 6.0 JDK Modules
3. 6.0 JDK Modules com.sun
4. 6.0 JDK Modules com.sun.java
5. 6.0 JDK Modules sun
6. 6.0 JDK Platform
7. Ajax
8. Apache Harmony Java SE
9. Aspect oriented
10. Authentication Authorization
11. Blogger System
12. Build
13. Byte Code
14. Cache
15. Chart
16. Chat
17. Code Analyzer
18. Collaboration
19. Content Management System
20. Database Client
21. Database DBMS
22. Database JDBC Connection Pool
23. Database ORM
24. Development
25. EJB Server geronimo
26. EJB Server GlassFish
27. EJB Server JBoss 4.2.1
28. EJB Server resin 3.1.5
29. ERP CRM Financial
30. ESB
31. Forum
32. GIS
33. Graphic Library
34. Groupware
35. HTML Parser
36. IDE
37. IDE Eclipse
38. IDE Netbeans
39. Installer
40. Internationalization Localization
41. Inversion of Control
42. Issue Tracking
43. J2EE
44. JBoss
45. JMS
46. JMX
47. Library
48. Mail Clients
49. Net
50. Parser
51. PDF
52. Portal
53. Profiler
54. Project Management
55. Report
56. RSS RDF
57. Rule Engine
58. Science
59. Scripting
60. Search Engine
61. Security
62. Sevlet Container
63. Source Control
64. Swing Library
65. Template Engine
66. Test Coverage
67. Testing
68. UML
69. Web Crawler
70. Web Framework
71. Web Mail
72. Web Server
73. Web Services
74. Web Services apache cxf 2.0.1
75. Web Services AXIS2
76. Wiki Engine
77. Workflow Engines
78. XML
79. XML UI
Java
Java Tutorial
Java Open Source
Jar File Download
Java Articles
Java Products
Java by API
Photoshop Tutorials
Maya Tutorials
Flash Tutorials
3ds-Max Tutorials
Illustrator Tutorials
GIMP Tutorials
C# / C Sharp
C# / CSharp Tutorial
C# / CSharp Open Source
ASP.Net
ASP.NET Tutorial
JavaScript DHTML
JavaScript Tutorial
JavaScript Reference
HTML / CSS
HTML CSS Reference
C / ANSI-C
C Tutorial
C++
C++ Tutorial
Ruby
PHP
Python
Python Tutorial
Python Open Source
SQL Server / T-SQL
SQL Server / T-SQL Tutorial
Oracle PL / SQL
Oracle PL/SQL Tutorial
PostgreSQL
SQL / MySQL
MySQL Tutorial
VB.Net
VB.Net Tutorial
Flash / Flex / ActionScript
VBA / Excel / Access / Word
XML
XML Tutorial
Microsoft Office PowerPoint 2007 Tutorial
Microsoft Office Excel 2007 Tutorial
Microsoft Office Word 2007 Tutorial
Java Source Code / Java Documentation » Parser » chaperon 3.0 » net.sourceforge.chaperon.build 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *  Copyright (C) Chaperon. All rights reserved.
003:         *  -------------------------------------------------------------------------
004:         *  This software is published under the terms of the Apache Software License
005:         *  version 1.1, a copy of which has been included  with this distribution in
006:         *  the LICENSE file.
007:         */
008:
009:        package net.sourceforge.chaperon.build;
010:
011:        import net.sourceforge.chaperon.model.Violations;
012:        import net.sourceforge.chaperon.model.pattern.Alternation;
013:        import net.sourceforge.chaperon.model.pattern.BeginOfLine;
014:        import net.sourceforge.chaperon.model.pattern.CharacterClass;
015:        import net.sourceforge.chaperon.model.pattern.CharacterInterval;
016:        import net.sourceforge.chaperon.model.pattern.CharacterSet;
017:        import net.sourceforge.chaperon.model.pattern.CharacterString;
018:        import net.sourceforge.chaperon.model.pattern.Concatenation;
019:        import net.sourceforge.chaperon.model.pattern.EndOfLine;
020:        import net.sourceforge.chaperon.model.pattern.Pattern;
021:        import net.sourceforge.chaperon.model.pattern.PatternGroup;
022:        import net.sourceforge.chaperon.model.pattern.UniversalCharacter;
023:        import net.sourceforge.chaperon.process.PatternAutomaton;
024:
025:        /**
026:         * This class represents a builder for the pattern automata.
027:         *
028:         * @author <a href="mailto:stephan@apache.org">Stephan Michels</a>
029:         * @version CVS $Id: PatternAutomatonBuilder.java,v 1.7 2003/12/09 19:55:52 benedikta Exp $
030:         */
031:        public class PatternAutomatonBuilder {
032:            private Pattern pattern = null;
033:            private PatternAutomaton automaton = null;
034:            private Violations violations = new Violations();
035:            private int statecount = 0;
036:            private int stateindex = 0;
037:            private int groupcount = 0;
038:            private int groupindex = 0;
039:
040:            /**
041:             * Create a builder for the pattern automata.
042:             *
043:             * @param pattern Pattern, which should be used to build the pattern automaton.
044:             */
045:            public PatternAutomatonBuilder(Pattern pattern) {
046:                violations.addViolations(pattern.validate());
047:
048:                if ((violations != null)
049:                        && (violations.getViolationCount() > 0))
050:                    throw new IllegalArgumentException("Pattern is not valid: "
051:                            + violations.getViolation(0));
052:
053:                this .pattern = pattern;
054:
055:                statecount = getStateCount(pattern) + 3;
056:                stateindex = statecount - 1;
057:
058:                groupcount = getGroupCount(pattern);
059:                groupindex = groupcount;
060:
061:                PatternAutomaton automaton = new PatternAutomaton(statecount);
062:
063:                automaton.setGroupCount(groupcount + 1);
064:
065:                int finalstate = stateindex--;
066:
067:                automaton.setFinalState(finalstate);
068:
069:                automaton.setType(stateindex, PatternAutomaton.TYPE_GROUPEND);
070:                automaton.setGroupIndex(stateindex, 0);
071:                automaton.setTransitions(stateindex, new int[] { finalstate });
072:
073:                int state = stateindex--;
074:
075:                state = traverse(automaton, pattern, state);
076:
077:                automaton.setType(stateindex, PatternAutomaton.TYPE_GROUPSTART);
078:                automaton.setGroupIndex(stateindex, 0);
079:                automaton.setTransitions(stateindex, new int[] { state });
080:
081:                automaton.setFirstState(stateindex);
082:
083:                this .automaton = automaton;
084:            }
085:
086:            /**
087:             * Return the builded automaton. This method will return null, if an error occurs.
088:             *
089:             * @return Pattern automaton.
090:             */
091:            public PatternAutomaton getPatternAutomaton() {
092:                return automaton;
093:            }
094:
095:            /**
096:             * Calculates the count of group in the pattern.
097:             *
098:             * @param element Root pattern.
099:             *
100:             * @return Count of groups.
101:             */
102:            private int getGroupCount(Pattern element) {
103:                int groupcount = 0;
104:
105:                if (element instanceof  Alternation) {
106:                    Alternation alternation = (Alternation) element;
107:
108:                    for (int i = 0; i < alternation.getPatternCount(); i++)
109:                        groupcount += getGroupCount(alternation.getPattern(i));
110:                } else if (element instanceof  Concatenation) {
111:                    Concatenation concatenation = (Concatenation) element;
112:
113:                    for (int i = 0; i < concatenation.getPatternCount(); i++)
114:                        groupcount += getGroupCount(concatenation.getPattern(i));
115:                } else if (element instanceof  PatternGroup) {
116:                    groupcount++;
117:
118:                    PatternGroup group = (PatternGroup) element;
119:
120:                    for (int i = 0; i < group.getPatternCount(); i++)
121:                        groupcount += getGroupCount(group.getPattern(i));
122:                }
123:
124:                return groupcount;
125:            }
126:
127:            /**
128:             * Calculates the count of states.
129:             *
130:             * @param element Root pattern.
131:             *
132:             * @return Count of states.
133:             */
134:            private int getStateCount(Pattern element) {
135:                int factor = 1;
136:                int offset = 0;
137:                int statecount = 0;
138:
139:                // generate closure for p
140:                if ((element.getMinOccurs() == 1)
141:                        && (element.getMaxOccurs() == 1)) {
142:                    // nothing
143:                }
144:
145:                // generate closure for p?
146:                else if ((element.getMinOccurs() == 0)
147:                        && (element.getMaxOccurs() == 1))
148:                    offset = 1;
149:
150:                // generate closure for p+
151:                else if ((element.getMinOccurs() == 1)
152:                        && (element.getMaxOccurs() == Integer.MAX_VALUE))
153:                    offset = 1;
154:
155:                // generate closure for p*
156:                else if ((element.getMinOccurs() == 0)
157:                        && (element.getMaxOccurs() == Integer.MAX_VALUE))
158:                    offset = 2;
159:
160:                // generate closure for p{n,m}
161:                else {
162:                    factor = element.getMaxOccurs();
163:                    offset = 1;
164:                }
165:
166:                if (element instanceof  Alternation) {
167:                    Alternation alternation = (Alternation) element;
168:
169:                    for (int i = 0; i < alternation.getPatternCount(); i++)
170:                        statecount += getStateCount(alternation.getPattern(i));
171:
172:                    if (alternation.getPatternCount() > 1)
173:                        statecount++;
174:                } else if (element instanceof  BeginOfLine)
175:                    statecount = 1;
176:                else if (element instanceof  CharacterClass) {
177:                    CharacterClass characterclass = (CharacterClass) element;
178:
179:                    for (int i = 0; i < characterclass
180:                            .getCharacterClassElementCount(); i++) {
181:                        if (characterclass.getCharacterClassElement(i) instanceof  CharacterInterval)
182:                            statecount++;
183:                        else if (characterclass.getCharacterClassElement(i) instanceof  CharacterSet) {
184:                            CharacterSet set = (CharacterSet) characterclass
185:                                    .getCharacterClassElement(i);
186:
187:                            statecount += set.getCharacters().length();
188:                        }
189:                    }
190:
191:                    statecount++;
192:                } else if (element instanceof  CharacterString) {
193:                    CharacterString string = (CharacterString) element;
194:
195:                    statecount += string.getString().length();
196:                } else if (element instanceof  Concatenation) {
197:                    Concatenation concatenation = (Concatenation) element;
198:
199:                    for (int i = 0; i < concatenation.getPatternCount(); i++)
200:                        statecount += getStateCount(concatenation.getPattern(i));
201:                } else if (element instanceof  EndOfLine)
202:                    statecount = 1;
203:                else if (element instanceof  PatternGroup) {
204:                    statecount = 2;
205:
206:                    PatternGroup group = (PatternGroup) element;
207:
208:                    for (int i = 0; i < group.getPatternCount(); i++)
209:                        statecount += getStateCount(group.getPattern(i));
210:                } else if (element instanceof  UniversalCharacter)
211:                    statecount = 1;
212:                else
213:                    throw new IllegalArgumentException(
214:                            "Pattern element not recognized");
215:
216:                return (factor * statecount) + offset;
217:            }
218:
219:            /*
220:             * @param laststate First state of the following pattern
221:             *
222:             * @return First state of the current pattern
223:             */
224:
225:            /**
226:             * Build the automaton by traversing the pattern tree.
227:             *
228:             * @param automaton The current automaton.
229:             * @param element The current pattern element.
230:             * @param laststate Last used state in the automaton.
231:             *
232:             * @return New last state in the automaton.
233:             */
234:            private int traverse(PatternAutomaton automaton, Pattern element,
235:                    int laststate) {
236:                int firststate;
237:
238:                // generate closure for p
239:                if ((element.getMinOccurs() == 1)
240:                        && (element.getMaxOccurs() == 1))
241:                    firststate = evalPattern(automaton, element, laststate);
242:
243:                // generate closure for p?
244:                else if ((element.getMinOccurs() == 0)
245:                        && (element.getMaxOccurs() == 1)) {
246:                    int s1 = evalPattern(automaton, element, laststate);
247:                    automaton.setTransitions(stateindex, new int[] { s1,
248:                            laststate });
249:                    firststate = stateindex--;
250:                }
251:
252:                // generate closure for p+
253:                else if ((element.getMinOccurs() == 1)
254:                        && (element.getMaxOccurs() == Integer.MAX_VALUE)) {
255:                    int s1 = stateindex--;
256:                    firststate = evalPattern(automaton, element, s1);
257:                    automaton.setTransitions(s1, new int[] { firststate,
258:                            laststate });
259:                }
260:
261:                // generate closure for p*
262:                else if ((element.getMinOccurs() == 0)
263:                        && (element.getMaxOccurs() == Integer.MAX_VALUE)) {
264:                    int s2 = stateindex--;
265:                    int s1 = evalPattern(automaton, element, s2);
266:                    automaton.setTransitions(s2, new int[] { s1, laststate });
267:
268:                    firststate = stateindex--;
269:                    automaton.setTransitions(firststate, new int[] { s1,
270:                            laststate });
271:                }
272:
273:                // generate closure for p{n,m}
274:                else {
275:                    int s2 = laststate;
276:                    for (int i = 0; i < element.getMinOccurs(); i++)
277:                        s2 = evalPattern(automaton, element, s2);
278:
279:                    int s1 = s2;
280:
281:                    for (int i = element.getMinOccurs(); i < element
282:                            .getMaxOccurs(); i++) {
283:                        s1 = evalPattern(automaton, element, s1);
284:                        if (i > element.getMinOccurs())
285:                            automaton.addTransition(s1, s2);
286:                    }
287:
288:                    firststate = stateindex--;
289:                    automaton.setTransitions(firststate, new int[] { s1, s2 });
290:                }
291:
292:                if (element instanceof  PatternGroup)
293:                    groupindex--;
294:
295:                return firststate;
296:            }
297:
298:            /**
299:             * Evalutates a pattern element.
300:             *
301:             * @param automaton The current automaton.
302:             * @param element The current pattern element.
303:             * @param laststate Last used state in the automaton.
304:             *
305:             * @return New last state in the automaton.
306:             */
307:            private int evalPattern(PatternAutomaton automaton,
308:                    Pattern element, int laststate) {
309:                if (element instanceof  Alternation)
310:                    return evalAlternation(automaton, (Alternation) element,
311:                            laststate);
312:                else if (element instanceof  BeginOfLine)
313:                    return evalBeginOfLine(automaton, (BeginOfLine) element,
314:                            laststate);
315:                else if (element instanceof  CharacterClass)
316:                    return evalCharacterClass(automaton,
317:                            (CharacterClass) element, laststate);
318:                else if (element instanceof  CharacterString)
319:                    return evalCharacterString(automaton,
320:                            (CharacterString) element, laststate);
321:                else if (element instanceof  Concatenation)
322:                    return evalConcatenation(automaton,
323:                            (Concatenation) element, laststate);
324:                else if (element instanceof  EndOfLine)
325:                    return evalEndOfLine(automaton, (EndOfLine) element,
326:                            laststate);
327:                else if (element instanceof  PatternGroup)
328:                    return evalPatternGroup(automaton, (PatternGroup) element,
329:                            laststate);
330:                else if (element instanceof  UniversalCharacter)
331:                    return evalUniversalCharacter(automaton,
332:                            (UniversalCharacter) element, laststate);
333:                else
334:                    throw new IllegalArgumentException(
335:                            "Pattern element not recognized");
336:            }
337:
338:            /**
339:             * Create the states and transitions for an alternation
340:             *
341:             * @param automaton The current automaton.
342:             * @param element The current pattern element.
343:             * @param laststate Last used state in the automaton.
344:             *
345:             * @return New last state in the automaton.
346:             */
347:            private int evalAlternation(PatternAutomaton automaton,
348:                    Alternation element, int laststate) {
349:                if (element.getPatternCount() == 1)
350:                    return traverse(automaton, element.getPattern(0), laststate);
351:                else {
352:                    int nextstate = stateindex--;
353:                    int state;
354:
355:                    for (int i = element.getPatternCount() - 1; i >= 0; i--) {
356:                        state = traverse(automaton, element.getPattern(i),
357:                                laststate);
358:                        automaton.addTransition(nextstate, state);
359:                    }
360:
361:                    return nextstate;
362:                }
363:            }
364:
365:            /**
366:             * Create the states and transitions for a pattern that matches  the begin of line.
367:             *
368:             * @param automaton The current automaton.
369:             * @param element The current pattern element.
370:             * @param laststate Last used state in the automaton.
371:             *
372:             * @return New last state in the automaton.
373:             */
374:            private int evalBeginOfLine(PatternAutomaton automaton,
375:                    BeginOfLine element, int laststate) {
376:                automaton.setType(stateindex, PatternAutomaton.TYPE_BOL);
377:                automaton.setTransitions(stateindex, new int[] { laststate });
378:                return stateindex--;
379:            }
380:
381:            /**
382:             * Create the states and transition for a character class.
383:             *
384:             * @param automaton The current automaton.
385:             * @param element The current pattern element.
386:             * @param laststate Last used state in the automaton.
387:             *
388:             * @return New last state in the automaton.
389:             */
390:            private int evalCharacterClass(PatternAutomaton automaton,
391:                    CharacterClass element, int laststate) {
392:                int state;
393:
394:                if (!element.isExclusive()) {
395:                    int firststate = stateindex--;
396:
397:                    for (int i = 0; i < element.getCharacterClassElementCount(); i++) {
398:                        if (element.getCharacterClassElement(i) instanceof  CharacterInterval) {
399:                            CharacterInterval interval = (CharacterInterval) element
400:                                    .getCharacterClassElement(i);
401:
402:                            automaton.setType(stateindex,
403:                                    PatternAutomaton.TYPE_MATCH);
404:                            automaton.setInterval(stateindex, interval
405:                                    .getMinimum(), interval.getMaximum());
406:                            automaton.addTransition(stateindex, laststate);
407:                            state = stateindex--;
408:                            automaton.addTransition(firststate, state);
409:                        } else if (element.getCharacterClassElement(i) instanceof  CharacterSet) {
410:                            CharacterSet set = (CharacterSet) element
411:                                    .getCharacterClassElement(i);
412:                            String chars = set.getCharacters();
413:
414:                            for (int j = 0; j < chars.length(); j++) {
415:                                automaton.setType(stateindex,
416:                                        PatternAutomaton.TYPE_MATCH);
417:                                automaton.setInterval(stateindex, chars
418:                                        .charAt(j), chars.charAt(j));
419:                                automaton.addTransition(stateindex, laststate);
420:                                state = stateindex--;
421:                                automaton.addTransition(firststate, state);
422:                            }
423:                        }
424:                    }
425:
426:                    return firststate;
427:                } else {
428:                    state = stateindex--;
429:                    automaton.setType(state, PatternAutomaton.TYPE_MATCHANY);
430:                    automaton.setTransitions(state, new int[] { laststate });
431:                    for (int i = element.getCharacterClassElementCount() - 1; i >= 0; i--) {
432:                        if (element.getCharacterClassElement(i) instanceof  CharacterInterval) {
433:                            CharacterInterval interval = (CharacterInterval) element
434:                                    .getCharacterClassElement(i);
435:
436:                            automaton.setType(stateindex,
437:                                    PatternAutomaton.TYPE_MATCH);
438:                            automaton.setInterval(stateindex, interval
439:                                    .getMinimum(), interval.getMaximum());
440:                            automaton.setTransitions(stateindex,
441:                                    new int[] { state });
442:                            state = stateindex--;
443:                        } else if (element.getCharacterClassElement(i) instanceof  CharacterSet) {
444:                            CharacterSet set = (CharacterSet) element
445:                                    .getCharacterClassElement(i);
446:                            String chars = set.getCharacters();
447:
448:                            for (int j = 0; j < chars.length(); j++) {
449:                                automaton.setType(stateindex,
450:                                        PatternAutomaton.TYPE_EXMATCH);
451:                                automaton.setInterval(stateindex, chars
452:                                        .charAt(j), chars.charAt(j));
453:                                automaton.setType(stateindex,
454:                                        PatternAutomaton.TYPE_EXMATCH);
455:                                automaton.setTransitions(stateindex,
456:                                        new int[] { state });
457:                                state = stateindex--;
458:                            }
459:                        }
460:                    }
461:
462:                    return state;
463:                }
464:            }
465:
466:            /**
467:             * Create the states and transitions for a string of characters.
468:             *
469:             * @param automaton The current automaton.
470:             * @param element The current pattern element.
471:             * @param laststate Last used state in the automaton.
472:             *
473:             * @return New last state in the automaton.
474:             */
475:            private int evalCharacterString(PatternAutomaton automaton,
476:                    CharacterString element, int laststate) {
477:                int state = laststate;
478:
479:                for (int i = element.getString().length() - 1; i >= 0; i--) {
480:                    automaton.setType(stateindex, PatternAutomaton.TYPE_MATCH);
481:                    automaton.setInterval(stateindex, element.getString()
482:                            .charAt(i), element.getString().charAt(i));
483:                    automaton.setTransitions(stateindex, new int[] { state });
484:                    state = stateindex--;
485:                }
486:
487:                return state;
488:            }
489:
490:            /**
491:             * Create the states and transitions for a catenation of pattern
492:             *
493:             * @param automaton The current automaton.
494:             * @param element The current pattern element.
495:             * @param laststate Last used state in the automaton.
496:             *
497:             * @return New last state in the automaton.
498:             */
499:            private int evalConcatenation(PatternAutomaton automaton,
500:                    Concatenation element, int laststate) {
501:                int state = laststate;
502:
503:                for (int i = element.getPatternCount() - 1; i >= 0; i--)
504:                    state = traverse(automaton, element.getPattern(i), state);
505:
506:                return state;
507:            }
508:
509:            /**
510:             * Create the states and transitions for a pattern that matches  the end of line.
511:             *
512:             * @param automaton The current automaton.
513:             * @param element The current pattern element.
514:             * @param laststate Last used state in the automaton.
515:             *
516:             * @return New last state in the automaton.
517:             */
518:            private int evalEndOfLine(PatternAutomaton automaton,
519:                    EndOfLine element, int laststate) {
520:                automaton.setType(stateindex, PatternAutomaton.TYPE_EOL);
521:                automaton.setTransitions(stateindex, new int[] { laststate });
522:                return stateindex--;
523:            }
524:
525:            /**
526:             * Create the states and transitions for a pattern group.
527:             *
528:             * @param automaton The current automaton.
529:             * @param element The current pattern element.
530:             * @param laststate Last used state in the automaton.
531:             *
532:             * @return New last state in the automaton.
533:             */
534:            private int evalPatternGroup(PatternAutomaton automaton,
535:                    PatternGroup element, int laststate) {
536:                int endstate = stateindex--;
537:
538:                automaton.setType(endstate, PatternAutomaton.TYPE_GROUPEND);
539:                automaton.setGroupIndex(endstate, groupindex);
540:                automaton.setTransitions(endstate, new int[] { laststate });
541:
542:                int nextstate = endstate;
543:
544:                for (int i = element.getPatternCount() - 1; i >= 0; i--)
545:                    nextstate = traverse(automaton, element.getPattern(i),
546:                            nextstate);
547:
548:                automaton.setGroupIndex(endstate, groupindex);
549:
550:                automaton.setType(stateindex, PatternAutomaton.TYPE_GROUPSTART);
551:                automaton.setGroupIndex(stateindex, groupindex);
552:                automaton.setTransitions(stateindex, new int[] { nextstate });
553:                return stateindex--;
554:            }
555:
556:            /**
557:             * Create the states and transition for an universal character.
558:             *
559:             * @param automaton The current automaton.
560:             * @param element The current pattern element.
561:             * @param laststate Last used state in the automaton.
562:             *
563:             * @return New last state in the automaton.
564:             */
565:            private int evalUniversalCharacter(PatternAutomaton automaton,
566:                    UniversalCharacter element, int laststate) {
567:                automaton.setType(stateindex, PatternAutomaton.TYPE_MATCHANY);
568:                automaton.setTransitions(stateindex, new int[] { laststate });
569:                return stateindex--;
570:            }
571:        }
www.java2java.com | Contact Us
Copyright 2009 - 12 Demo Source and Support. All rights reserved.
All other trademarks are property of their respective owners.