Source Code Cross Referenced for DbGroup.java in  » Forum » yazd » com » Yasna » forum » database » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Forum » yazd » com.Yasna.forum.database 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /**
002:         * Copyright (C) 2001 Yasna.com. All rights reserved.
003:         *
004:         * ===================================================================
005:         * The Apache Software License, Version 1.1
006:         *
007:         * Redistribution and use in source and binary forms, with or without
008:         * modification, are permitted provided that the following conditions
009:         * are met:
010:         *
011:         * 1. Redistributions of source code must retain the above copyright
012:         *    notice, this list of conditions and the following disclaimer.
013:         *
014:         * 2. Redistributions in binary form must reproduce the above copyright
015:         *    notice, this list of conditions and the following disclaimer in
016:         *    the documentation and/or other materials provided with the
017:         *    distribution.
018:         *
019:         * 3. The end-user documentation included with the redistribution,
020:         *    if any, must include the following acknowledgment:
021:         *       "This product includes software developed by
022:         *        Yasna.com (http://www.yasna.com)."
023:         *    Alternately, this acknowledgment may appear in the software itself,
024:         *    if and wherever such third-party acknowledgments normally appear.
025:         *
026:         * 4. The names "Yazd" and "Yasna.com" must not be used to
027:         *    endorse or promote products derived from this software without
028:         *    prior written permission. For written permission, please
029:         *    contact yazd@yasna.com.
030:         *
031:         * 5. Products derived from this software may not be called "Yazd",
032:         *    nor may "Yazd" appear in their name, without prior written
033:         *    permission of Yasna.com.
034:         *
035:         * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
036:         * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
037:         * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
038:         * DISCLAIMED.  IN NO EVENT SHALL YASNA.COM OR
039:         * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
040:         * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
041:         * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
042:         * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
043:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
044:         * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
045:         * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
046:         * SUCH DAMAGE.
047:         * ====================================================================
048:         *
049:         * This software consists of voluntary contributions made by many
050:         * individuals on behalf of Yasna.com. For more information
051:         * on Yasna.com, please see <http://www.yasna.com>.
052:         */package com.Yasna.forum.database;
053:
054:        import com.Yasna.forum.*;
055:        import com.Yasna.util.Cacheable;
056:        import com.Yasna.util.CacheSizes;
057:
058:        import java.util.Iterator;
059:        import java.util.ArrayList;
060:        import java.sql.*;
061:
062:        /**
063:         * Database implementation of the Group interface.
064:         *
065:         * @see Group
066:         */
067:        public class DbGroup implements  Group, Cacheable {
068:
069:            /** DATABASE QUERIES **/
070:            private static final String ADD_ADMIN = "INSERT INTO yazdGroupUser(groupID,userID,administrator) VALUES(?,?,1)";
071:            private static final String REMOVE_ADMIN = "DELETE FROM yazdGroupUser WHERE groupID=? AND userID=? AND administrator=1";
072:            private static final String ADD_USER = "INSERT INTO yazdGroupUser(groupID,userID,administrator) VALUES(?,?,0)";
073:            private static final String REMOVE_USER = "DELETE FROM yazdGroupUser WHERE groupID=? AND userID=? AND administrator=0";
074:            private static final String ADMIN_TEST = "SELECT userID FROM yazdGroupUser WHERE groupID=? AND userID=? AND "
075:                    + "administrator=1";
076:            private static final String MEMBER_TEST = "SELECT userID FROM yazdGroupUser WHERE groupID=? AND userID=?";
077:            private static final String ADMIN_COUNT = "SELECT count(*) FROM yazdGroupUser WHERE groupID=? "
078:                    + "AND administrator=1";
079:            private static final String MEMBER_COUNT = "SELECT DISTINCT count(userID) FROM yazdGroupUser "
080:                    + "WHERE groupID=?";
081:            private static final String LOAD_ADMINS = "SELECT userID FROM yazdGroupUser WHERE administrator=1 AND groupID=?";
082:            private static final String LOAD_USERS = "SELECT userID FROM yazdGroupUser WHERE groupID=?";
083:            private static final String LOAD_GROUP_BY_ID = "SELECT * FROM yazdGroup WHERE groupID=?";
084:            private static final String LOAD_GROUP_BY_NAME = "SELECT * FROM yazdGroup WHERE name=?";
085:            private static final String INSERT_GROUP = "INSERT INTO yazdGroup(name,description,groupID,automember) VALUES(?,?,?,0)";
086:            private static final String SAVE_GROUP = "UPDATE yazdGroup SET name=?, description=?,automember=? WHERE groupID=?";
087:
088:            private int id;
089:            private String name = null;
090:            private String description = "";
091:            private boolean automembership = false;
092:
093:            private ProfileManager profileManager;
094:            private DbForumFactory factory;
095:
096:            /**
097:             * Creates a new group.
098:             *
099:             * @param the name of the group.
100:             * @param profileManager a ProfileManager that can be used to perform user
101:             *    and group operations.
102:             */
103:            protected DbGroup(String name, DbForumFactory factory) {
104:                this .name = name;
105:                this .factory = factory;
106:                this .profileManager = factory.getProfileManager();
107:                this .id = DbSequenceManager.nextID("Group");
108:                insertIntoDb();
109:            }
110:
111:            /**
112:             * Loads a group from the database based on its id.
113:             *
114:             * @param id the id of the group to load.
115:             * @param profileManager a ProfileManager that can be used to perform user
116:             *    and group operations.
117:             */
118:            protected DbGroup(int id, DbForumFactory factory)
119:                    throws GroupNotFoundException {
120:                this .id = id;
121:                this .factory = factory;
122:                this .profileManager = factory.getProfileManager();
123:                loadFromDb();
124:            }
125:
126:            /**
127:             * Loads a group from the database based on its name. The implementation
128:             * of this method is rather hackish since it includes a fake parameter just
129:             * so that it can have a different method signature than the first
130:             * constructor. Even so, this methodology makes this class behave more like
131:             * our other classes, so we're gleefully leaving it this way. :)
132:             *
133:             * @param name the name of the group to load.
134:             * @param fake a fake paramater that can always be null.
135:             * @param profileManager a ProfileManager that can be used to perform user
136:             *    and group operations.
137:             */
138:            protected DbGroup(String name, Object fake, DbForumFactory factory)
139:                    throws GroupNotFoundException {
140:                this .name = name;
141:                this .factory = factory;
142:                this .profileManager = factory.getProfileManager();
143:                loadFromDb();
144:            }
145:
146:            //FROM THE USER INTERFACE//
147:
148:            public int getID() {
149:                return id;
150:            }
151:
152:            public String getName() {
153:                return name;
154:            }
155:
156:            public boolean getAutoGroupMembership() {
157:                return automembership;
158:            }
159:
160:            public void setAutoGroupMembership(boolean param)
161:                    throws UnauthorizedException {
162:                this .automembership = param;
163:                saveToDb();
164:            }
165:
166:            public void setName(String name) throws UnauthorizedException {
167:                this .name = name;
168:                saveToDb();
169:            }
170:
171:            public String getDescription() {
172:                return description;
173:            }
174:
175:            public void setDescription(String description)
176:                    throws UnauthorizedException {
177:                this .description = description;
178:                saveToDb();
179:            }
180:
181:            public void addAdministrator(User user)
182:                    throws UnauthorizedException {
183:                Connection con = null;
184:                PreparedStatement pstmt = null;
185:                try {
186:                    con = DbConnectionManager.getConnection();
187:                    pstmt = con.prepareStatement(ADD_ADMIN);
188:                    pstmt.setInt(1, id);
189:                    pstmt.setInt(2, user.getID());
190:                    pstmt.execute();
191:                } catch (SQLException sqle) {
192:                    sqle.printStackTrace();
193:                } finally {
194:                    try {
195:                        pstmt.close();
196:                    } catch (Exception e) {
197:                        e.printStackTrace();
198:                    }
199:                    try {
200:                        con.close();
201:                    } catch (Exception e) {
202:                        e.printStackTrace();
203:                    }
204:                }
205:
206:                //Now, remove the user from the USER_PERM_CACHE since being in the
207:                //group could affect their permissions.
208:                DbCacheManager cacheManager = factory.getCacheManager();
209:                cacheManager.removeUserPerm(new Integer(user.getID()));
210:            }
211:
212:            public void removeAdministrator(User user)
213:                    throws UnauthorizedException {
214:                Connection con = null;
215:                PreparedStatement pstmt = null;
216:                try {
217:                    con = DbConnectionManager.getConnection();
218:                    pstmt = con.prepareStatement(REMOVE_ADMIN);
219:                    pstmt.setInt(1, id);
220:                    pstmt.setInt(2, user.getID());
221:                    pstmt.execute();
222:                } catch (SQLException sqle) {
223:                    sqle.printStackTrace();
224:                } finally {
225:                    try {
226:                        pstmt.close();
227:                    } catch (Exception e) {
228:                        e.printStackTrace();
229:                    }
230:                    try {
231:                        con.close();
232:                    } catch (Exception e) {
233:                        e.printStackTrace();
234:                    }
235:                }
236:
237:                //Now, remove the user from the USER_PERM_CACHE since being in the
238:                //group could affect their permissions.
239:                DbCacheManager cacheManager = factory.getCacheManager();
240:                cacheManager.removeUserPerm(new Integer(user.getID()));
241:            }
242:
243:            public void addMember(User user) throws UnauthorizedException {
244:                Connection con = null;
245:                PreparedStatement pstmt = null;
246:                try {
247:                    con = DbConnectionManager.getConnection();
248:                    pstmt = con.prepareStatement(ADD_USER);
249:                    pstmt.setInt(1, id);
250:                    pstmt.setInt(2, user.getID());
251:                    pstmt.execute();
252:                } catch (SQLException sqle) {
253:                    sqle.printStackTrace();
254:                } finally {
255:                    try {
256:                        pstmt.close();
257:                    } catch (Exception e) {
258:                        e.printStackTrace();
259:                    }
260:                    try {
261:                        con.close();
262:                    } catch (Exception e) {
263:                        e.printStackTrace();
264:                    }
265:                }
266:
267:                //Now, remove the user from the USER_PERM_CACHE since being in the
268:                //group could affect their permissions.
269:                DbCacheManager cacheManager = factory.getCacheManager();
270:                cacheManager.removeUserPerm(new Integer(user.getID()));
271:            }
272:
273:            public void removeMember(User user) throws UnauthorizedException {
274:                Connection con = null;
275:                PreparedStatement pstmt = null;
276:                try {
277:                    con = DbConnectionManager.getConnection();
278:                    pstmt = con.prepareStatement(REMOVE_USER);
279:                    pstmt.setInt(1, id);
280:                    pstmt.setInt(2, user.getID());
281:                    pstmt.execute();
282:                } catch (SQLException sqle) {
283:                    sqle.printStackTrace();
284:                } finally {
285:                    try {
286:                        pstmt.close();
287:                    } catch (Exception e) {
288:                        e.printStackTrace();
289:                    }
290:                    try {
291:                        con.close();
292:                    } catch (Exception e) {
293:                        e.printStackTrace();
294:                    }
295:                }
296:
297:                //Now, remove the user from the USER_PERM_CACHE since being in the
298:                //group could affect their permissions.
299:                DbCacheManager cacheManager = factory.getCacheManager();
300:                cacheManager.removeUserPerm(new Integer(user.getID()));
301:            }
302:
303:            public boolean isAdministrator(User user) {
304:                boolean answer = false;
305:                Connection con = null;
306:                PreparedStatement pstmt = null;
307:                try {
308:                    con = DbConnectionManager.getConnection();
309:                    pstmt = con.prepareStatement(ADMIN_TEST);
310:                    pstmt.setInt(1, id);
311:                    pstmt.setInt(2, user.getID());
312:                    ResultSet rs = pstmt.executeQuery();
313:                    if (rs.next()) {
314:                        answer = true;
315:                    }
316:                } catch (SQLException sqle) {
317:                    sqle.printStackTrace();
318:                } finally {
319:                    try {
320:                        pstmt.close();
321:                    } catch (Exception e) {
322:                        e.printStackTrace();
323:                    }
324:                    try {
325:                        con.close();
326:                    } catch (Exception e) {
327:                        e.printStackTrace();
328:                    }
329:                }
330:                return answer;
331:            }
332:
333:            public boolean isMember(User user) {
334:                boolean answer = false;
335:                Connection con = null;
336:                PreparedStatement pstmt = null;
337:                try {
338:                    con = DbConnectionManager.getConnection();
339:                    pstmt = con.prepareStatement(MEMBER_TEST);
340:                    pstmt.setInt(1, id);
341:                    pstmt.setInt(2, user.getID());
342:                    ResultSet rs = pstmt.executeQuery();
343:                    if (rs.next()) {
344:                        answer = true;
345:                    }
346:                } catch (SQLException sqle) {
347:                    sqle.printStackTrace();
348:                } finally {
349:                    try {
350:                        pstmt.close();
351:                    } catch (Exception e) {
352:                        e.printStackTrace();
353:                    }
354:                    try {
355:                        con.close();
356:                    } catch (Exception e) {
357:                        e.printStackTrace();
358:                    }
359:                }
360:                return answer;
361:            }
362:
363:            public int getAdministratorCount() {
364:                int count = 0;
365:                boolean answer = false;
366:                Connection con = null;
367:                PreparedStatement pstmt = null;
368:                try {
369:                    con = DbConnectionManager.getConnection();
370:                    pstmt = con.prepareStatement(ADMIN_COUNT);
371:                    pstmt.setInt(1, id);
372:                    ResultSet rs = pstmt.executeQuery();
373:                    if (rs.next()) {
374:                        count = rs.getInt(1);
375:                    }
376:                } catch (SQLException sqle) {
377:                    sqle.printStackTrace();
378:                } finally {
379:                    try {
380:                        pstmt.close();
381:                    } catch (Exception e) {
382:                        e.printStackTrace();
383:                    }
384:                    try {
385:                        con.close();
386:                    } catch (Exception e) {
387:                        e.printStackTrace();
388:                    }
389:                }
390:                return count;
391:            }
392:
393:            public int getMemberCount() {
394:                int count = 0;
395:                boolean answer = false;
396:                Connection con = null;
397:                PreparedStatement pstmt = null;
398:                try {
399:                    con = DbConnectionManager.getConnection();
400:                    pstmt = con.prepareStatement(MEMBER_COUNT);
401:                    pstmt.setInt(1, id);
402:                    ResultSet rs = pstmt.executeQuery();
403:                    if (rs.next()) {
404:                        count = rs.getInt(1);
405:                    }
406:                } catch (SQLException sqle) {
407:                    sqle.printStackTrace();
408:                } finally {
409:                    try {
410:                        pstmt.close();
411:                    } catch (Exception e) {
412:                        e.printStackTrace();
413:                    }
414:                    try {
415:                        con.close();
416:                    } catch (Exception e) {
417:                        e.printStackTrace();
418:                    }
419:                }
420:                return count;
421:            }
422:
423:            public Iterator members() {
424:                ArrayList admins = new ArrayList();
425:                //Load list of group admins from db.
426:                Connection con = null;
427:                PreparedStatement pstmt = null;
428:
429:                try {
430:                    con = DbConnectionManager.getConnection();
431:                    pstmt = con.prepareStatement(LOAD_USERS);
432:                    pstmt.setInt(1, id);
433:                    ResultSet rs = pstmt.executeQuery();
434:                    User user = null;
435:                    while (rs.next()) {
436:                        try {
437:                            user = profileManager.getUser(rs.getInt("userID"));
438:                        } catch (UserNotFoundException unfe) {
439:                            unfe.printStackTrace(System.out);
440:                        }
441:                        admins.add(user);
442:                    }
443:                } catch (SQLException sqle) {
444:                    System.err.println("SQLException in DbGroup.java:"
445:                            + "users():reading group data " + sqle);
446:                    sqle.printStackTrace();
447:                } finally {
448:                    try {
449:                        pstmt.close();
450:                    } catch (Exception e) {
451:                        e.printStackTrace();
452:                    }
453:                    try {
454:                        con.close();
455:                    } catch (Exception e) {
456:                        e.printStackTrace();
457:                    }
458:                }
459:                return admins.iterator();
460:            }
461:
462:            public Iterator administrators() {
463:                ArrayList admins = new ArrayList();
464:                //Load list of group admins from db.
465:                Connection con = null;
466:                PreparedStatement pstmt = null;
467:
468:                try {
469:                    con = DbConnectionManager.getConnection();
470:                    pstmt = con.prepareStatement(LOAD_ADMINS);
471:                    pstmt.setInt(1, id);
472:                    ResultSet rs = pstmt.executeQuery();
473:                    User user = null;
474:                    while (rs.next()) {
475:                        try {
476:                            user = profileManager.getUser(rs.getInt("userID"));
477:                        } catch (UserNotFoundException unfe) {
478:                            unfe.printStackTrace(System.out);
479:                        }
480:                        admins.add(user);
481:                    }
482:                } catch (SQLException sqle) {
483:                    System.err.println("SQLException in DbGroup.java:"
484:                            + "administrators():reading group data " + sqle);
485:                    sqle.printStackTrace();
486:                } finally {
487:                    try {
488:                        pstmt.close();
489:                    } catch (Exception e) {
490:                        e.printStackTrace();
491:                    }
492:                    try {
493:                        con.close();
494:                    } catch (Exception e) {
495:                        e.printStackTrace();
496:                    }
497:                }
498:                return admins.iterator();
499:            }
500:
501:            public ForumPermissions getPermissions(Authorization authorization) {
502:                int userID = authorization.getUserID();
503:                try {
504:                    User user = profileManager.getUser(userID);
505:                    if (isAdministrator(user)) {
506:                        return new ForumPermissions(false, false, false, false,
507:                                true, false, false, false);
508:                    }
509:                } catch (Exception e) {
510:                }
511:
512:                return ForumPermissions.none();
513:            }
514:
515:            public boolean hasPermission(int type) {
516:                return true;
517:            }
518:
519:            //FROM THE CACHEABLE INTERFACE//
520:
521:            public int getSize() {
522:                //Approximate the size of the object in bytes by calculating the size
523:                //of each field.
524:                int size = 0;
525:                size += CacheSizes.sizeOfObject(); //overhead of object
526:                size += CacheSizes.sizeOfInt(); //id
527:                size += CacheSizes.sizeOfString(name); //name
528:                size += CacheSizes.sizeOfString(description); //description
529:                size += CacheSizes.sizeOfObject(); //profile manager ref.
530:                size += CacheSizes.sizeOfObject(); //forum factory ref.
531:
532:                return size;
533:            }
534:
535:            //OTHER METHODS
536:
537:            /**
538:             * Returns a String representation of the Group object using the group name.
539:             *
540:             * @return a String representation of the Group object.
541:             */
542:            public String toString() {
543:                return name;
544:            }
545:
546:            public int hashCode() {
547:                return id;
548:            }
549:
550:            public boolean equals(Object object) {
551:                if (this  == object) {
552:                    return true;
553:                }
554:                if (object != null && object instanceof  DbGroup) {
555:                    return id == ((DbGroup) object).getID();
556:                } else {
557:                    return false;
558:                }
559:            }
560:
561:            /**
562:             * Load the group data from the database.
563:             */
564:            private synchronized void loadFromDb()
565:                    throws GroupNotFoundException {
566:                String query;
567:                if (name == null) {
568:                    query = LOAD_GROUP_BY_ID;
569:                } else {
570:                    query = LOAD_GROUP_BY_NAME;
571:                }
572:                Connection con = null;
573:                PreparedStatement pstmt = null;
574:                try {
575:                    con = DbConnectionManager.getConnection();
576:                    pstmt = con.prepareStatement(query);
577:                    if (name == null) {
578:                        pstmt.setInt(1, id);
579:                    } else {
580:                        pstmt.setString(1, name);
581:                    }
582:                    ResultSet rs = pstmt.executeQuery();
583:                    if (!rs.next()) {
584:                        throw new GroupNotFoundException();
585:                    }
586:                    this .id = rs.getInt("groupID");
587:                    this .name = rs.getString("name");
588:                    this .description = rs.getString("description");
589:                    this .automembership = (rs.getInt("automember") == 1) ? true
590:                            : false;
591:                } catch (SQLException sqle) {
592:                    System.err.println("SQLException in DbGroup.java:"
593:                            + "loadFromDb():reading group data " + sqle);
594:                    throw new GroupNotFoundException();
595:                } finally {
596:                    try {
597:                        pstmt.close();
598:                    } catch (Exception e) {
599:                        e.printStackTrace();
600:                    }
601:                    try {
602:                        con.close();
603:                    } catch (Exception e) {
604:                        e.printStackTrace();
605:                    }
606:                }
607:            }
608:
609:            /**
610:             * Inserts a new record into the database.
611:             */
612:            private void insertIntoDb() {
613:                StringBuffer insert = new StringBuffer();
614:                Connection con = null;
615:                PreparedStatement pstmt = null;
616:                try {
617:                    con = DbConnectionManager.getConnection();
618:                    pstmt = con.prepareStatement(INSERT_GROUP);
619:                    pstmt.setString(1, name);
620:                    pstmt.setString(2, description);
621:                    pstmt.setInt(3, id);
622:                    pstmt.executeUpdate();
623:                } catch (SQLException sqle) {
624:                    System.err.println("Error in DbGroup:insertIntoDb()-"
625:                            + sqle);
626:                    sqle.printStackTrace();
627:                } finally {
628:                    try {
629:                        pstmt.close();
630:                    } catch (Exception e) {
631:                        e.printStackTrace();
632:                    }
633:                    try {
634:                        con.close();
635:                    } catch (Exception e) {
636:                        e.printStackTrace();
637:                    }
638:                }
639:            }
640:
641:            /**
642:             * Saves group data to the db.
643:             */
644:            private synchronized void saveToDb() {
645:                Connection con = null;
646:                PreparedStatement pstmt = null;
647:                try {
648:                    con = DbConnectionManager.getConnection();
649:                    pstmt = con.prepareStatement(SAVE_GROUP);
650:                    pstmt.setString(1, name);
651:                    pstmt.setString(2, description);
652:                    pstmt.setInt(3, (automembership ? 1 : 0));
653:                    pstmt.setInt(4, id);
654:                    pstmt.executeUpdate();
655:                } catch (SQLException sqle) {
656:                    System.err
657:                            .println("SQLException in DbGroup.java:saveToDb(): "
658:                                    + sqle);
659:                    sqle.printStackTrace();
660:                } finally {
661:                    try {
662:                        pstmt.close();
663:                    } catch (Exception e) {
664:                        e.printStackTrace();
665:                    }
666:                    try {
667:                        con.close();
668:                    } catch (Exception e) {
669:                        e.printStackTrace();
670:                    }
671:                }
672:            }
673:        }
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