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.
32 import java.util.ArrayList;
35 import mir.config.MirPropertiesConfiguration;
36 import mir.log.LoggerWrapper;
37 import mir.storage.Database;
38 import mir.storage.store.StorableObject;
39 import mir.storage.store.StoreContainerType;
40 import mir.storage.store.StoreIdentifier;
41 import mir.storage.store.StoreUtil;
45 * Container class for lists of Entities.
46 * Now implements @see mir.database.store.StorableObject.
49 * first version 27.6.1999
51 * @version 1.1 (cleaned up)
53 public class EntityList implements StorableObject {
54 protected static MirPropertiesConfiguration configuration = MirPropertiesConfiguration.instance();
55 protected LoggerWrapper logger;
56 private ArrayList theEntityArrayList = new ArrayList();
57 private String whereClause, orderClause;
58 private Database storage;
59 private int offset, limit;
60 private int nextOffset = -1;
63 logger = new LoggerWrapper("Entity.List");
66 /* get/set EntityClass of Objects stored in EntityList */
67 public void setStorage(Database aStorage) {
71 public Database getStorage() {
75 public void setLimit(int aLimit) {
80 * Sets the WHERE clause that fetched the Entities of this EntityList from the database.
82 * @param wc The string that contains the WHERE clause
84 public void setWhere(String wc) {
85 this.whereClause = wc;
89 * Returns the WHERE clause that returned this EntityList from the database
91 * @return whereClause The WHERE clause
93 public String getWhere() {
98 * Sets the sorting criterium of this EntityList
102 public void setOrder(String oc) {
103 this.orderClause = oc;
107 * Returns the sorting criterium.
109 * @return orderClause The sort order
111 public String getOrder() {
118 * @param i The offset
120 public void setOffset(int i) {
129 public int getOffset() {
134 * Sets the offset of the next batch of Entities.
136 * @param i The next offset
138 public void setNextBatch(int i) {
143 * Returns the offset of the next batch of Entities.
145 * @return offset of the next batch
147 public int getNextBatch() {
152 * Returns whether there is a next batch within the WHERE clause
154 * @return true if yes, false if no.
156 public boolean hasNextBatch() {
157 return (nextOffset >= 0);
161 * Inserts an Entity into the EntityList.
163 * @param anEntity The entity to be inserted.
166 public void add (Entity anEntity) {
168 theEntityArrayList.add(anEntity);
170 logger.warn("EntityList: add called with empty Entity");
175 * @return The number of Entities in the EntityList.
179 return theEntityArrayList.size();
184 * Returns the element at position i in the EntityList as Entity
185 * @param i the position of the element in question
186 * @return The element at position i.
189 public Entity elementAt(int i) {
190 /** todo check if i is in list.size() */
191 return (Entity) theEntityArrayList.get(i);
196 // Methods to implement StorableObject
198 public Set getNotifyOnReleaseSet() { return null; }
200 public StoreIdentifier getStoreIdentifier() {
201 if ( storage!=null ) {
204 this, StoreContainerType.STOC_TYPE_ENTITYLIST,
205 StoreUtil.getEntityListUniqueIdentifierFor( storage.getTableName(),
206 whereClause, orderClause, offset, limit ));
208 logger.warn("EntityList could not return StoreIdentifier");