2 * Copyright (C) 2001, 2002 The Mir-coders group
4 * This file is part of Mir.
6 * Mir is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * Mir is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with Mir; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 * In addition, as a special exception, The Mir-coders gives permission to link
21 * the code of this program with any library licensed under the Apache Software License,
22 * The Sun (tm) Java Advanced Imaging library (JAI), The Sun JIMI library
23 * (or with modified versions of the above that use the same license as the above),
24 * and distribute linked combinations including the two. You must obey the
25 * GNU General Public License in all respects for all of the code used other than
26 * the above mentioned libraries. If you modify this file, you may extend this
27 * exception to your version of the file, but you are not obligated to do so.
28 * If you do not wish to do so, delete this exception statement from your version.
31 package mircoders.storage;
33 import mir.entity.Entity;
34 import mir.entity.EntityRelation;
35 import mir.log.LoggerWrapper;
36 import mir.storage.Database;
37 import mir.storage.StorageObject;
38 import mir.storage.StorageObjectExc;
39 import mir.storage.StorageObjectFailure;
42 * <b>Diese Klasse implementiert die Datenbankverbindung zur MetaObjekt-Tabelle
47 public class DatabaseMedia extends Database implements StorageObject{
49 private static DatabaseMedia instance;
50 private static EntityRelation relationMediaType;
52 // the following *has* to be sychronized cause this static method
53 // could get preemted and we could end up with 2 instances of DatabaseFoo..
54 // see the "Singletons with needles and thread" article at JavaWorld -mh
55 public synchronized static DatabaseMedia getInstance() {
56 if (instance == null) {
57 instance = new DatabaseMedia();
58 instance.myselfDatabase = instance;
63 private DatabaseMedia() {
66 logger = new LoggerWrapper("Database.Media");
71 new EntityRelation("to_media_type", "id", DatabaseMediaType.getInstance(), EntityRelation.TO_ONE);
72 theEntityClass = mircoders.entity.EntityMedia.class;
79 * returns the comments that belong to the article (via entityrelation)
80 * where db-flag is_published is true
82 public Entity getMediaType(Entity ent) throws StorageObjectFailure, StorageObjectExc {
84 return relationMediaType.getOne(ent);
87 logger.error("failed to get media_type: " + e.getMessage());
88 throw new StorageObjectFailure("DatabaseMedia.getMediaType :" + e.getMessage(),e);