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.
30 package mir.entity.adapter;
32 import java.util.Collection;
33 import java.util.HashMap;
34 import java.util.Iterator;
35 import java.util.List;
39 import mir.entity.Entity;
40 import mir.util.CachingRewindableIterator;
42 /** An EntityAdapter is a wrapper around an Entity meant to add
43 * missing functionality. It provides "calculated fields"
44 * which mir installations can extend reasonably easilly.
45 * "calculated fields" compute values that are not directly present
46 * in the db table. For example:
47 * a field to have the number of comments associated with an article;
48 * a field to get the list of hidden comments associated with an article;
50 * <p>This whole framework is meant to be replaced by hibernate</p>
52 public class EntityAdapter implements Map {
53 private Entity entity;
54 private EntityAdapterDefinition definition;
55 private Map calculatedFieldsCache;
56 private EntityAdapterModel model;
58 public EntityAdapter(Entity anEntity, EntityAdapterDefinition aDefinition, EntityAdapterModel aModel) {
60 definition = aDefinition;
61 calculatedFieldsCache = new HashMap();
65 public boolean containsKey(Object aKey) {
67 if (aKey instanceof String)
68 return entity.hasField((String) aKey)
69 || definition.hasCalculatedField((String) aKey);
77 public boolean equals(Object anObject) {
78 return anObject instanceof EntityAdapter
79 && ((EntityAdapter) anObject).entity.equals(entity);
82 public int hashCode() {
83 return entity.hashCode();
86 public Entity getEntity() {
90 public EntityAdapterModel getModel() {
94 public Object get(Object aKey) {
97 if (calculatedFieldsCache.containsKey(aKey)) {
98 return calculatedFieldsCache.get(aKey);
100 else if (aKey instanceof String && definition.hasCalculatedField((String) aKey)) {
101 result = definition.getCalculatedField((String) aKey).getValue(this);
102 calculatedFieldsCache.put(aKey, result);
106 else if (aKey instanceof String) {
107 return entity.getFieldValue((String) aKey);
114 public boolean isEmpty() {
118 public Set keySet() {
119 throw new UnsupportedOperationException("EntityAdapter.keySet()");
122 public Object put(Object aKey, Object value) {
123 throw new UnsupportedOperationException("EntityAdapter.put()");
126 public void putAll(Map t) {
127 throw new UnsupportedOperationException("EntityAdapter.putAll()");
130 public Object remove(Object aKey) {
131 throw new UnsupportedOperationException("EntityAdapter.remove()");
135 throw new UnsupportedOperationException("EntityAdapter.size()");
138 public Collection values() {
139 throw new UnsupportedOperationException("EntityAdapter.values()");
142 public void clear() {
143 throw new UnsupportedOperationException("EntityAdapter.clear()");
146 public boolean containsValue(Object value) {
147 throw new UnsupportedOperationException("EntityAdapter.containsValue()");
150 public Set entrySet() {
151 throw new UnsupportedOperationException("EntityAdapter.entrySet()");
154 public Object getComplexRelation(String aMainTablePrefix, List someExtraTables,
155 String aWhereClause, String anOrderByClause, String aDefinition) {
158 new CachingRewindableIterator(
159 new EntityIteratorAdapter(aMainTablePrefix, someExtraTables,
160 aWhereClause, anOrderByClause,
161 -1, getModel(), aDefinition, -1, 0)
164 catch (Throwable t) {
165 throw new RuntimeException(t.getMessage());
170 public Object getRelation(String aWhereClause, String anOrderByClause, String aDefinition) {
172 return EntityAdapterEngine.retrieveAdapterList(model, aDefinition, aWhereClause, anOrderByClause, -1, 0);
174 catch (Throwable t) {
175 throw new RuntimeException(t.getMessage());
179 public EntityAdapter getToOneRelation(String aWhereClause, String anOrderByClause, String aDefinition) {
181 Iterator i = new EntityIteratorAdapter(aWhereClause, anOrderByClause, 1, getModel(), aDefinition, 1, 0);
184 return (EntityAdapter) i.next();
187 catch (Throwable t) {
188 throw new RuntimeException(t.getMessage());
192 public EntityAdapter getComplexToOneRelation(String aMainTablePrefix, List someExtraTables,
193 String aWhereClause, String anOrderByClause, String aDefinition) {
195 Iterator i = new EntityIteratorAdapter(aMainTablePrefix, someExtraTables, aWhereClause, anOrderByClause, -1,
196 getModel(), aDefinition, 1, 0);
199 return (EntityAdapter) i.next();
202 catch (Throwable t) {
203 throw new RuntimeException(t.getMessage());