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 the com.oreilly.servlet library, any library
22 * licensed under the Apache Software License, The Sun (tm) Java Advanced
23 * Imaging library (JAI), The Sun JIMI library (or with modified versions of
24 * the above that use the same license as the above), and distribute linked
25 * combinations including the two. You must obey the GNU General Public
26 * License in all respects for all of the code used other than the above
27 * mentioned libraries. If you modify this file, you may extend this exception
28 * to your version of the file, but you are not obligated to do so. If you do
29 * not wish to do so, delete this exception statement from your version.
34 import java.util.ArrayList;
37 import freemarker.template.TemplateListModel;
38 import freemarker.template.TemplateModel;
40 import mir.log.LoggerWrapper;
41 import mir.config.MirPropertiesConfiguration;
42 import mir.config.MirPropertiesConfiguration.PropertiesConfigExc;
43 import mir.storage.StorageObject;
44 import mir.storage.store.StorableObject;
45 import mir.storage.store.StoreContainerType;
46 import mir.storage.store.StoreIdentifier;
47 import mir.storage.store.StoreUtil;
51 * Container class for lists of Entities.
52 * Now implements freemarker.template.TemplateListModel
53 * and @see mir.storage.store.StorableObject.
56 * first version 27.6.1999
58 * @version 1.0 (freemarker compliant & and storable in ObjectStore)
60 public class EntityList implements TemplateListModel, StorableObject {
61 protected static MirPropertiesConfiguration configuration;
62 protected LoggerWrapper logger;
63 private ArrayList theEntityArrayList = new ArrayList();
64 private String whereClause, orderClause;
65 private StorageObject theStorage;
66 private int count, offset, limit;
67 private int offsetnext = -1, offsetprev = -1;
68 private int freemarkerListPointer=-1;
73 configuration = MirPropertiesConfiguration.instance();
75 catch (PropertiesConfigExc e) {
76 throw new RuntimeException("Unable to get configuration: " + e.getMessage());
84 logger = new LoggerWrapper("Entity.List");
87 /* get/set EntityClass of Objects stored in EntityList */
88 public void setStorage(StorageObject storage) { this.theStorage=storage; }
89 public StorageObject getStorage() { return theStorage; }
91 public void setLimit(int limit) { this.limit = limit; }
94 * Sets the WHERE clause that fetched the Entities of this EntityList from the database.
95 * @param wc The string that contains the WHERE clause
97 public void setWhere(String wc) {
98 this.whereClause = wc;
102 * Returns the WHERE clause that returned this EntityList from the database
103 * @return whereClause The WHERE clause
105 public String getWhere() {
111 * Sets the sorting criterium of this EntityList
114 public void setOrder(String oc) {
115 this.orderClause = oc;
119 * Returns the sorting criterium.
120 * @return orderClause The sort order
122 public String getOrder() {
127 * Sets the number of rows that match the WHERE clause
128 * @param i The number of rows that match the WHERE clause
130 public void setCount(int i) {
135 * Returns the number of rows that match the WHERE clause
136 * @return The number of rows ...
138 public int getCount() {
144 * @param i The offset
146 public void setOffset(int i) {
154 public int getOffset() {
159 * Sets the offset of the next batch of Entities.
160 * @param i The next offset
162 public void setNextBatch(int i) {
167 * Returns the offset of the next batch of Entities.
168 * @return offset of the next batch
170 public int getNextBatch() {
175 * Returns whether there is a next batch within the WHERE clause
176 * @return true if yes, false if no.
178 public boolean hasNextBatch() {
179 return (offsetnext >= 0);
183 * Sets the offset of the previous batch.
184 * @param i the previous offset
186 public void setPrevBatch(int i) {
191 * Returns the offset of the previous batch.
192 * @return offset of the previous batch
194 public int getPrevBatch() {
199 * Returns whether there is a previous batch.
200 * @return true if yes, false if no
202 public boolean hasPrevBatch() {
203 return (offsetprev >= 0);
207 * Returns the start index of the batch.
210 public int getFrom() {
215 * Returns the end index of the batch.
226 * Inserts an Entity into the EntityList.
227 * @param anEntity The entity to be inserted.
230 public void add (Entity anEntity) {
232 theEntityArrayList.add(anEntity);
234 logger.warn("EntityList: add called with empty Entity");
239 * @return The number of Entities in the EntityList.
243 return theEntityArrayList.size();
248 * Returns the element at position i in the EntityList as Entity
249 * @param i the position of the element in question
250 * @return The element at position i.
253 public Entity elementAt(int i) {
254 /** @todo check if i is in list.size() */
255 return (Entity)theEntityArrayList.get(i);
259 // The following methods have to be implemented
260 // for this class to be an implementation of the
261 // TemplateListModel of the Freemarker packages
263 public TemplateModel get(int i) { return elementAt(i); }
264 public boolean isRewound() { return (freemarkerListPointer==-1) ? true : false; }
265 public void rewind() { freemarkerListPointer=-1; }
267 public TemplateModel next() {
269 freemarkerListPointer++;return get(freemarkerListPointer); }
275 * Returns whether there is a next element
276 * @return true if there is a next element, else false
279 public boolean hasNext() {
280 return theEntityArrayList.size()>0 && freemarkerListPointer+2<=theEntityArrayList.size();
285 * Returns whether EntityList is empty or not
286 * @return true in case of empty list, false otherwise
289 public boolean isEmpty() {
290 if (theEntityArrayList!=null)
291 return theEntityArrayList.size()<1 ;
296 // Methods to implement StorableObject
298 public Set getNotifyOnReleaseSet() { return null; }
300 public StoreIdentifier getStoreIdentifier() {
301 if ( theStorage!=null ) {
303 new StoreIdentifier( this, StoreContainerType.STOC_TYPE_ENTITYLIST,
304 StoreUtil.getEntityListUniqueIdentifierFor( theStorage.getTableName(),
305 whereClause, orderClause, offset, limit ));
307 logger.warn("EntityList could not return StoreIdentifier");