Source Code Cross Referenced for OntEventManager.java in  » RSS-RDF » Jena-2.5.5 » com » hp » hpl » jena » ontology » event » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » RSS RDF » Jena 2.5.5 » com.hp.hpl.jena.ontology.event 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*****************************************************************************
002:         * Source code information
003:         * -----------------------
004:         * Original author    Ian Dickinson, HP Labs Bristol
005:         * Author email       ian.dickinson@hp.com
006:         * Package            Jena 2
007:         * Web                http://sourceforge.net/projects/jena/
008:         * Created            10-Sep-2003
009:         * Filename           $RCSfile: OntEventManager.java,v $
010:         * Revision           $Revision: 1.9 $
011:         * Release status     $State: Exp $
012:         *
013:         * Last modified on   $Date: 2008/01/02 12:10:36 $
014:         *               by   $Author: andy_seaborne $
015:         *
016:         * (c) Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 Hewlett-Packard Development Company, LP
017:         * [See end of file]
018:         *****************************************************************************/package com.hp.hpl.jena.ontology.event;
019:
020:        // Imports
021:        ///////////////
022:        import java.util.*;
023:
024:        import com.hp.hpl.jena.ontology.*;
025:        import com.hp.hpl.jena.rdf.listeners.StatementListener;
026:        import com.hp.hpl.jena.rdf.model.*;
027:        import com.hp.hpl.jena.vocabulary.*;
028:        import com.hp.hpl.jena.vocabulary.OntEventsVocab;
029:
030:        /**
031:         * <p>
032:         * An adapter that translates RDF model-level changes into higher level changes that
033:         * are appropriate to ontology users.  The large number of specific events that the
034:         * ontology model can produce makes the traditional Java style of listener interface
035:         * impractical. Instead, this event manager allows the user to register 
036:         * {@linkplain OntEventHandler handlers}, based on command pattern, against specific
037:         * {@linkplain OntEventsVocab event types}. 
038:         * </p>
039:         * <p>
040:         * For example, to register a handler for the declaration of an ontology class:
041:         * </p>
042:         * <pre>
043:         * OntModel m = ...
044:         * OntEventManager em = m.getEventManager();
045:         * em.addHandler( OntEvents.CLASS_DECLARATION,
046:         *                new OntEventHandler() {
047:         *                    public void action( Resource ev, boolean added,
048:         *                                        RDFNode arg0, RDFNode arg1 ) {
049:         *                        OntClass c = (OntClass) arg0;
050:         *                        if (added) {
051:         *                            // class c added to model
052:         *                        }
053:         *                        else {
054:         *                            // class c removed from model
055:         *                        }
056:         *                    }
057:         *                }
058:         *              );
059:         * </pre>
060:         * <p>
061:         * This listener acts as an adapter for graph events (i.e. adding and
062:         * removing triples), converting them to higher-level ontology events.  This is non-trivial, because
063:         * Jena currently doesn't have a means of batching changes so that only consistent
064:         * graph states are seen.  For efficiency in non event-using models, this listener
065:         * is only attached as a statement listener to the underlying graph when the first
066:         * ontology event listener is added.
067:         * </p>
068:         * 
069:         * @author Ian Dickinson, HP Labs
070:         *         (<a  href="mailto:Ian.Dickinson@hp.com" >email</a>)
071:         * @version CVS $Id: OntEventManager.java,v 1.9 2008/01/02 12:10:36 andy_seaborne Exp $
072:         */
073:        public class OntEventManager extends StatementListener {
074:            // Constants
075:            //////////////////////////////////
076:
077:            // Static variables
078:            //////////////////////////////////
079:
080:            /** Initialisation data for the rdf:type to event type table */
081:            private static Object[][] s_rdfTypeInit = {
082:                    { OntEventsVocab.classDeclaration, new ProfileAccessor() {
083:                        public Resource get(Profile p) {
084:                            return p.CLASS();
085:                        }
086:                    } },
087:                    { OntEventsVocab.datarangeDeclaration,
088:                            new ProfileAccessor() {
089:                                public Resource get(Profile p) {
090:                                    return p.DATARANGE();
091:                                }
092:                            } },
093:                    { OntEventsVocab.propertyDeclaration,
094:                            new ProfileAccessor() {
095:                                public Resource get(Profile p) {
096:                                    return p.PROPERTY();
097:                                }
098:                            } },
099:                    { OntEventsVocab.objectPropertyDeclaration,
100:                            new ProfileAccessor() {
101:                                public Resource get(Profile p) {
102:                                    return p.OBJECT_PROPERTY();
103:                                }
104:                            } },
105:                    { OntEventsVocab.datatypePropertyDeclaration,
106:                            new ProfileAccessor() {
107:                                public Resource get(Profile p) {
108:                                    return p.DATATYPE_PROPERTY();
109:                                }
110:                            } },
111:                    { OntEventsVocab.transitivePropertyDeclaration,
112:                            new ProfileAccessor() {
113:                                public Resource get(Profile p) {
114:                                    return p.TRANSITIVE_PROPERTY();
115:                                }
116:                            } },
117:                    { OntEventsVocab.symmetricPropertyDeclaration,
118:                            new ProfileAccessor() {
119:                                public Resource get(Profile p) {
120:                                    return p.SYMMETRIC_PROPERTY();
121:                                }
122:                            } },
123:                    { OntEventsVocab.functionalPropertyDeclaration,
124:                            new ProfileAccessor() {
125:                                public Resource get(Profile p) {
126:                                    return p.FUNCTIONAL_PROPERTY();
127:                                }
128:                            } },
129:                    { OntEventsVocab.inverseFunctionalPropertyDeclaration,
130:                            new ProfileAccessor() {
131:                                public Resource get(Profile p) {
132:                                    return p.INVERSE_FUNCTIONAL_PROPERTY();
133:                                }
134:                            } },
135:                    { OntEventsVocab.annotationPropertyDeclaration,
136:                            new ProfileAccessor() {
137:                                public Resource get(Profile p) {
138:                                    return p.ANNOTATION_PROPERTY();
139:                                }
140:                            } },
141:                    { OntEventsVocab.ontologyPropertyDeclaration,
142:                            new ProfileAccessor() {
143:                                public Resource get(Profile p) {
144:                                    return p.ONTOLOGY_PROPERTY();
145:                                }
146:                            } },
147:                    { OntEventsVocab.restrictionDeclaration,
148:                            new ProfileAccessor() {
149:                                public Resource get(Profile p) {
150:                                    return p.RESTRICTION();
151:                                }
152:                            } },
153:                    { OntEventsVocab.allDifferentDeclaration,
154:                            new ProfileAccessor() {
155:                                public Resource get(Profile p) {
156:                                    return p.ALL_DIFFERENT();
157:                                }
158:                            } },
159:                    { OntEventsVocab.ontologyDeclaration,
160:                            new ProfileAccessor() {
161:                                public Resource get(Profile p) {
162:                                    return p.ONTOLOGY();
163:                                }
164:                            } }, };
165:
166:            /** Initialisation data for the predicate to event type table */
167:            private static Object[][] s_predicateInit = {
168:                    { OntEventsVocab.intersectionOf, new ProfileAccessor() {
169:                        public Resource get(Profile p) {
170:                            return p.INTERSECTION_OF();
171:                        }
172:                    } },
173:                    { OntEventsVocab.equivalentClass, new ProfileAccessor() {
174:                        public Resource get(Profile p) {
175:                            return p.EQUIVALENT_CLASS();
176:                        }
177:                    } },
178:                    { OntEventsVocab.disjointWith, new ProfileAccessor() {
179:                        public Resource get(Profile p) {
180:                            return p.DISJOINT_WITH();
181:                        }
182:                    } },
183:                    { OntEventsVocab.equivalentProperty, new ProfileAccessor() {
184:                        public Resource get(Profile p) {
185:                            return p.EQUIVALENT_PROPERTY();
186:                        }
187:                    } },
188:                    { OntEventsVocab.sameAs, new ProfileAccessor() {
189:                        public Resource get(Profile p) {
190:                            return p.SAME_AS();
191:                        }
192:                    } },
193:                    { OntEventsVocab.differentFrom, new ProfileAccessor() {
194:                        public Resource get(Profile p) {
195:                            return p.DIFFERENT_FROM();
196:                        }
197:                    } },
198:                    { OntEventsVocab.distinctMembers, new ProfileAccessor() {
199:                        public Resource get(Profile p) {
200:                            return p.DISTINCT_MEMBERS();
201:                        }
202:                    } },
203:                    { OntEventsVocab.unionOf, new ProfileAccessor() {
204:                        public Resource get(Profile p) {
205:                            return p.UNION_OF();
206:                        }
207:                    } },
208:                    { OntEventsVocab.intersectionOf, new ProfileAccessor() {
209:                        public Resource get(Profile p) {
210:                            return p.INTERSECTION_OF();
211:                        }
212:                    } },
213:                    { OntEventsVocab.complementOf, new ProfileAccessor() {
214:                        public Resource get(Profile p) {
215:                            return p.COMPLEMENT_OF();
216:                        }
217:                    } },
218:                    { OntEventsVocab.oneOf, new ProfileAccessor() {
219:                        public Resource get(Profile p) {
220:                            return p.ONE_OF();
221:                        }
222:                    } },
223:                    { OntEventsVocab.onProperty, new ProfileAccessor() {
224:                        public Resource get(Profile p) {
225:                            return p.ON_PROPERTY();
226:                        }
227:                    } },
228:                    { OntEventsVocab.allValuesFrom, new ProfileAccessor() {
229:                        public Resource get(Profile p) {
230:                            return p.ALL_VALUES_FROM();
231:                        }
232:                    } },
233:                    { OntEventsVocab.hasValue, new ProfileAccessor() {
234:                        public Resource get(Profile p) {
235:                            return p.HAS_VALUE();
236:                        }
237:                    } },
238:                    { OntEventsVocab.someValuesFrom, new ProfileAccessor() {
239:                        public Resource get(Profile p) {
240:                            return p.SOME_VALUES_FROM();
241:                        }
242:                    } },
243:                    { OntEventsVocab.minCardinality, new ProfileAccessor() {
244:                        public Resource get(Profile p) {
245:                            return p.MIN_CARDINALITY();
246:                        }
247:                    } },
248:                    { OntEventsVocab.maxCardinality, new ProfileAccessor() {
249:                        public Resource get(Profile p) {
250:                            return p.MAX_CARDINALITY();
251:                        }
252:                    } },
253:                    { OntEventsVocab.cardinalityQ, new ProfileAccessor() {
254:                        public Resource get(Profile p) {
255:                            return p.CARDINALITY_Q();
256:                        }
257:                    } },
258:                    { OntEventsVocab.minCardinalityQ, new ProfileAccessor() {
259:                        public Resource get(Profile p) {
260:                            return p.MIN_CARDINALITY_Q();
261:                        }
262:                    } },
263:                    { OntEventsVocab.maxCardinalityQ, new ProfileAccessor() {
264:                        public Resource get(Profile p) {
265:                            return p.MAX_CARDINALITY_Q();
266:                        }
267:                    } },
268:                    { OntEventsVocab.cardinality, new ProfileAccessor() {
269:                        public Resource get(Profile p) {
270:                            return p.CARDINALITY();
271:                        }
272:                    } },
273:                    { OntEventsVocab.inverseOf, new ProfileAccessor() {
274:                        public Resource get(Profile p) {
275:                            return p.INVERSE_OF();
276:                        }
277:                    } },
278:                    { OntEventsVocab.imports, new ProfileAccessor() {
279:                        public Resource get(Profile p) {
280:                            return p.IMPORTS();
281:                        }
282:                    } },
283:                    { OntEventsVocab.versionInfo, new ProfileAccessor() {
284:                        public Resource get(Profile p) {
285:                            return p.VERSION_INFO();
286:                        }
287:                    } },
288:                    { OntEventsVocab.priorVersion, new ProfileAccessor() {
289:                        public Resource get(Profile p) {
290:                            return p.PRIOR_VERSION();
291:                        }
292:                    } },
293:                    { OntEventsVocab.backwardCompatibleWith,
294:                            new ProfileAccessor() {
295:                                public Resource get(Profile p) {
296:                                    return p.BACKWARD_COMPATIBLE_WITH();
297:                                }
298:                            } },
299:                    { OntEventsVocab.incompatibleWith, new ProfileAccessor() {
300:                        public Resource get(Profile p) {
301:                            return p.INCOMPATIBLE_WITH();
302:                        }
303:                    } }, };
304:
305:            // Instance variables
306:            //////////////////////////////////
307:
308:            /** Map from event types to handlers */
309:            private Map m_handlers = new HashMap();
310:
311:            /** Map from rdf:type to event type */
312:            private Map m_rdfTypeToEventType = new HashMap();
313:
314:            /** Map from predicate to event type */
315:            private Map m_predicateToEventType = new HashMap();
316:
317:            /** Default event handler */
318:            private OntEventHandler m_defaultHandler = null;
319:
320:            // Constructors
321:            //////////////////////////////////
322:
323:            /**
324:             * <p>Construct an ontology event manager for the given ontology model.
325:             * This involves registering adapters for the ontology events corresponding
326:             * to the language profile of the given model.</p>
327:             * @param m An ontology model 
328:             */
329:            public OntEventManager(OntModel m) {
330:                Profile p = m.getProfile();
331:                initialiseTable(m_rdfTypeToEventType, p, s_rdfTypeInit);
332:                initialiseTable(m_predicateToEventType, p, s_predicateInit);
333:            }
334:
335:            // External signature methods
336:            //////////////////////////////////
337:
338:            /**
339:             * <p>Handle the addition of a statement to the model.</p>
340:             * @param s The added statement
341:             */
342:            public void addedStatement(Statement s) {
343:                processStatement(s, true);
344:            }
345:
346:            /**
347:             * <p>Handle the removal of a statement to the model</p>
348:             * @param s The removed statement
349:             */
350:            public void removedStatement(Statement s) {
351:                processStatement(s, false);
352:            }
353:
354:            /**
355:             * <p>Raise an event to be handled by the attached event handlers.</p>
356:             * @param event The resource representing the event type
357:             * @param added True if this is an addition to the model, false otherwise
358:             * @param source The model that caused the event to be raised
359:             * @param arg0 The first argument to the event
360:             * @param arg1 The second argument to the event, or null
361:             * @param arg2 The third argument to the event, or null
362:             */
363:            public void raise(Resource event, boolean added, Model source,
364:                    RDFNode arg0, RDFNode arg1, RDFNode arg2) {
365:                OntEventHandler h = getHandler(event);
366:                if (h != null) {
367:                    h.action(event, added, source, arg0, arg1, arg2);
368:                } else if (m_defaultHandler != null) {
369:                    // if no assigned handler, call the default handler
370:                    m_defaultHandler.action(event, added, source, arg0, arg1,
371:                            arg2);
372:                }
373:            }
374:
375:            /**
376:             * <p>Add the given handler as the default event handler, which will be invoked if
377:             * no other handler is applicable to a given event.</p>
378:             * @param handler The event handler object
379:             */
380:            public void addDefaultHandler(OntEventHandler handler) {
381:                m_defaultHandler = handler;
382:            }
383:
384:            /**
385:             * <p>Add the given handler as the handler for the given event type, replacing
386:             * any existing handler.</p>
387:             * @param event The event type to be handled, as a resource
388:             * @param handler The event handler object
389:             */
390:            public void addHandler(Resource event, OntEventHandler handler) {
391:                m_handlers.put(event, handler);
392:            }
393:
394:            /**
395:             * <p>Add the given handlers as the handler for the given event types, replacing
396:             * any existing handlers.</p>
397:             * @param handlers An array of pairs, where the first element of each pair
398:             * is the resource denoting the event to be handled, and the second is the 
399:             * handler object
400:             */
401:            public void addHandlers(Object[][] handlers) {
402:                for (int i = 0; i < handlers.length;) {
403:                    Resource r = (Resource) handlers[i][0];
404:                    OntEventHandler h = (OntEventHandler) handlers[i][1];
405:                    addHandler(r, h);
406:                }
407:            }
408:
409:            /**
410:             * <p>Answer the event handler for the given event, or null if not defined</p>
411:             * @param event An event type to look up
412:             * @return The current handler for the event, or null
413:             */
414:            public OntEventHandler getHandler(Resource event) {
415:                return (OntEventHandler) m_handlers.get(event);
416:            }
417:
418:            /**
419:             * <p>Answer the default event handler, or null if not defined</p>
420:             * @return The default event handler, or null
421:             */
422:            public OntEventHandler getDefaultHandler() {
423:                return m_defaultHandler;
424:            }
425:
426:            /**
427:             * <p>Remove any existing handler for the given event type.</p>
428:             * @param event The event for which the handler is to be removed
429:             */
430:            public void removeHandler(Resource event) {
431:                m_handlers.remove(event);
432:            }
433:
434:            /**
435:             * <p>Answer true if there is a defined handler for the given event type.</p>
436:             * @param event An event type, as a resource
437:             * @return True if there is a defined handler for the event
438:             */
439:            public boolean hasHandler(Resource event) {
440:                return m_handlers.containsKey(event);
441:            }
442:
443:            /**
444:             * <p>Answer an iterator over the events that are registered in this
445:             * event manager.</p>
446:             * @return An iterator over the event types of events that have registered handlers
447:             */
448:            public Iterator listRegisteredEvents() {
449:                return m_handlers.keySet().iterator();
450:            }
451:
452:            // Internal implementation methods
453:            //////////////////////////////////
454:
455:            /**
456:             * <p>Initialise the given map from static initialisation data. This will be a mapping
457:             * that allows us to determine the correct ontology event type for a given triple.</p>
458:             * @param map The map to update
459:             * @param p An ontology language profile
460:             * @param source A table of initialisation data
461:             */
462:            private void initialiseTable(Map map, Profile p, Object[][] source) {
463:                for (int i = 0; i < source.length; i++) {
464:                    // get the initialisation data from the table
465:                    Resource evType = (Resource) source[i][0];
466:                    Resource key = ((ProfileAccessor) source[i][1]).get(p);
467:
468:                    if (key != null) {
469:                        // is defined for this term
470:                        map.put(key, evType);
471:                    }
472:                }
473:            }
474:
475:            /**
476:             * <p>Process an incoming added or removed statement to raise the appropriate ontology event.</p>
477:             * @param s
478:             * @param added
479:             */
480:            private void processStatement(Statement s, boolean added) {
481:                // first check if this an rdf:type statement
482:                if (s.getPredicate().equals(RDF.type)) {
483:                    // yes - now is it a builtin type?
484:                    Resource type = s.getResource();
485:                    Resource evType = (Resource) m_rdfTypeToEventType.get(type);
486:
487:                    if (evType != null) {
488:                        // was a known type, so we know which event to raise
489:                        raise(evType, added, s.getModel(), s.getSubject(),
490:                                null, null);
491:                    } else {
492:                        // must be an individual
493:                        raise(OntEventsVocab.individualDeclaration, added, s
494:                                .getModel(), s.getSubject(), type, null);
495:                    }
496:                } else {
497:                    // not rdf:type, but may still be a known predicate
498:                    Property pred = s.getPredicate();
499:                    Resource evType = (Resource) m_predicateToEventType
500:                            .get(pred);
501:
502:                    if (evType != null) {
503:                        // was a known predicate, so we know which event to raise
504:                        raise(evType, added, s.getModel(), s.getSubject(), s
505:                                .getObject(), null);
506:                    } else {
507:                        // default - assume user data
508:                        raise(OntEventsVocab.userData, added, s.getModel(), s
509:                                .getSubject(), pred, s.getObject());
510:                    }
511:                }
512:            }
513:
514:            //==============================================================================
515:            // Inner class definitions
516:            //==============================================================================
517:
518:            /** Simple wrapper to allow us to dynamically extract elements from the profile */
519:            private static interface ProfileAccessor {
520:                public Resource get(Profile p);
521:            }
522:        }
523:
524:        /*
525:         *  (c) Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 Hewlett-Packard Development Company, LP
526:         *  All rights reserved.
527:         *
528:         * Redistribution and use in source and binary forms, with or without
529:         * modification, are permitted provided that the following conditions
530:         * are met:
531:         * 1. Redistributions of source code must retain the above copyright
532:         *    notice, this list of conditions and the following disclaimer.
533:         * 2. Redistributions in binary form must reproduce the above copyright
534:         *    notice, this list of conditions and the following disclaimer in the
535:         *    documentation and/or other materials provided with the distribution.
536:         * 3. The name of the author may not be used to endorse or promote products
537:         *    derived from this software without specific prior written permission.
538:         *
539:         * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
540:         * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
541:         * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
542:         * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
543:         * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
544:         * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
545:         * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
546:         * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
547:         * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
548:         * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
549:         */
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