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.
33 import java.sql.SQLException;
35 import mir.entity.Entity;
36 import mir.entity.EntityList;
37 import mir.storage.Database;
41 * This class provides the base functionality for the derived Module-Classes.
42 * These classes should provide methods to make more or less complex actions
43 * on Database and Entity classes. The modules are used by ServletModules.
44 * Future possibility could be access via Applications.
46 * Abstrakte Klasse, von denen die Modules die Basisfunktionalit?t erben.
47 * Die Moduleschicht dient dazu, Funktionalitaeten zur Verf?gung zu stellen,
48 * die von mehreren ServletModulen verwendet werden.
52 public class AbstractModule {
53 protected Database database;
55 public AbstractModule(Database aDatabase) {
60 * Returns the database object associated with this module
62 public Database getStorageObject () {
66 public Entity getById (String id) throws ModuleExc, ModuleFailure {
69 throw new ModuleExc("AbstractModule.getById: No Database set!");
70 Entity entity = database.selectById(id);
73 throw new ModuleExc("AbstractModule.getById: No object for id = " + id);
78 throw new ModuleFailure(e);
82 public EntityList getByWhereClause (String whereClause, int offset) throws ModuleExc, ModuleFailure {
85 throw new ModuleExc("AbstractModule.getByWhereClause: No Database set!");
87 return database.selectByWhereClause(whereClause, offset);
90 throw new ModuleFailure(e);
95 * * Standardfunktion, um einen Datensatz via Database einzuf?gen
96 * @param theValues Hash mit Spalte/Wert-Paaren
97 * @return Id des eingef?gten Objekts
98 * @exception ModuleExc
99 * @exception ModuleFailure
101 public String add(Map theValues) throws ModuleExc, ModuleFailure {
103 Entity entity = database.createNewEntity();
104 entity.setFieldValues(theValues);
106 return entity.insert();
108 catch (Throwable e) {
109 throw new ModuleFailure(e);
114 * Standardfunktion, um einen Datensatz via Database zu aktualisieren
115 * @param theValues Hash mit Spalte/Wert-Paaren
116 * @return Id des eingef?gten Objekts
117 * @exception ModuleExc
118 * @exception ModuleFailure
120 public String set (Map theValues) throws ModuleExc, ModuleFailure {
122 Entity theEntity = database.selectById((String) theValues.get("id"));
123 if (theEntity == null)
124 throw new ModuleExc("No object found with id " + theValues.get("id"));
125 theEntity.setFieldValues(theValues);
127 return theEntity.getId();
129 catch (Throwable e) {
130 throw new ModuleFailure(e);
135 * Deletes a record using an id
137 * @exception ModuleExc
138 * @exception ModuleFailure
140 public void deleteById (String idParam) throws ModuleExc, ModuleFailure {
142 database.delete(idParam);
144 catch (Throwable e) {
145 throw new ModuleFailure(e);
150 * returns the number of rows
152 public int getSize(String where) throws ModuleExc, ModuleFailure {
154 return database.getSize(where);
156 catch (SQLException e) {
157 throw new ModuleFailure("Can't retrieve number of entities: " + e.toString(), e);