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 mir.config.MirPropertiesConfiguration;
38 import mir.config.MirPropertiesConfiguration.PropertiesConfigExc;
39 import mir.log.LoggerWrapper;
40 import mir.storage.StorageObject;
41 import mir.storage.store.StorableObject;
42 import mir.storage.store.StoreContainerType;
43 import mir.storage.store.StoreIdentifier;
44 import mir.storage.store.StoreUtil;
45 import freemarker.template.TemplateListModel;
46 import freemarker.template.TemplateModel;
50 * Container class for lists of Entities.
51 * Now implements freemarker.template.TemplateListModel
52 * and @see mir.storage.store.StorableObject.
55 * first version 27.6.1999
57 * @version 1.0 (freemarker compliant & and storable in ObjectStore)
59 public class EntityList implements TemplateListModel, StorableObject {
60 protected static MirPropertiesConfiguration configuration;
61 protected LoggerWrapper logger;
62 private ArrayList theEntityArrayList = new ArrayList();
63 private String whereClause, orderClause;
64 private StorageObject theStorage;
65 private int count, offset, limit;
66 private int offsetnext = -1, offsetprev = -1;
67 private int freemarkerListPointer=-1;
72 configuration = MirPropertiesConfiguration.instance();
74 catch (PropertiesConfigExc e) {
75 throw new RuntimeException("Unable to get configuration: " + e.getMessage());
83 logger = new LoggerWrapper("Entity.List");
86 /* get/set EntityClass of Objects stored in EntityList */
87 public void setStorage(StorageObject storage) { this.theStorage=storage; }
88 public StorageObject getStorage() { return theStorage; }
90 public void setLimit(int limit) { this.limit = limit; }
93 * Sets the WHERE clause that fetched the Entities of this EntityList from the database.
94 * @param wc The string that contains the WHERE clause
96 public void setWhere(String wc) {
97 this.whereClause = wc;
101 * Returns the WHERE clause that returned this EntityList from the database
102 * @return whereClause The WHERE clause
104 public String getWhere() {
110 * Sets the sorting criterium of this EntityList
113 public void setOrder(String oc) {
114 this.orderClause = oc;
118 * Returns the sorting criterium.
119 * @return orderClause The sort order
121 public String getOrder() {
126 * Sets the number of rows that match the WHERE clause
127 * @param i The number of rows that match the WHERE clause
129 public void setCount(int i) {
134 * Returns the number of rows that match the WHERE clause
135 * @return The number of rows ...
137 public int getCount() {
143 * @param i The offset
145 public void setOffset(int i) {
153 public int getOffset() {
158 * Sets the offset of the next batch of Entities.
159 * @param i The next offset
161 public void setNextBatch(int i) {
166 * Returns the offset of the next batch of Entities.
167 * @return offset of the next batch
169 public int getNextBatch() {
174 * Returns whether there is a next batch within the WHERE clause
175 * @return true if yes, false if no.
177 public boolean hasNextBatch() {
178 return (offsetnext >= 0);
182 * Sets the offset of the previous batch.
183 * @param i the previous offset
185 public void setPrevBatch(int i) {
190 * Returns the offset of the previous batch.
191 * @return offset of the previous batch
193 public int getPrevBatch() {
198 * Returns whether there is a previous batch.
199 * @return true if yes, false if no
201 public boolean hasPrevBatch() {
202 return (offsetprev >= 0);
206 * Returns the start index of the batch.
209 public int getFrom() {
214 * Returns the end index of the batch.
225 * Inserts an Entity into the EntityList.
226 * @param anEntity The entity to be inserted.
229 public void add (Entity anEntity) {
231 theEntityArrayList.add(anEntity);
233 logger.warn("EntityList: add called with empty Entity");
238 * @return The number of Entities in the EntityList.
242 return theEntityArrayList.size();
247 * Returns the element at position i in the EntityList as Entity
248 * @param i the position of the element in question
249 * @return The element at position i.
252 public Entity elementAt(int i) {
253 /** @todo check if i is in list.size() */
254 return (Entity)theEntityArrayList.get(i);
258 // The following methods have to be implemented
259 // for this class to be an implementation of the
260 // TemplateListModel of the Freemarker packages
262 public TemplateModel get(int i) { return elementAt(i); }
263 public boolean isRewound() { return (freemarkerListPointer==-1) ? true : false; }
264 public void rewind() { freemarkerListPointer=-1; }
266 public TemplateModel next() {
268 freemarkerListPointer++;return get(freemarkerListPointer); }
274 * Returns whether there is a next element
275 * @return true if there is a next element, else false
278 public boolean hasNext() {
279 return theEntityArrayList.size()>0 && freemarkerListPointer+2<=theEntityArrayList.size();
284 * Returns whether EntityList is empty or not
285 * @return true in case of empty list, false otherwise
288 public boolean isEmpty() {
289 if (theEntityArrayList!=null)
290 return theEntityArrayList.size()<1 ;
295 // Methods to implement StorableObject
297 public Set getNotifyOnReleaseSet() { return null; }
299 public StoreIdentifier getStoreIdentifier() {
300 if ( theStorage!=null ) {
302 new StoreIdentifier( this, StoreContainerType.STOC_TYPE_ENTITYLIST,
303 StoreUtil.getEntityListUniqueIdentifierFor( theStorage.getTableName(),
304 whereClause, orderClause, offset, limit ));
306 logger.warn("EntityList could not return StoreIdentifier");