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.misc.Logfile;
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 {
61 private static Logfile theLog;
62 protected static MirPropertiesConfiguration configuration;
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();
74 } catch (PropertiesConfigExc e) {
77 theLog = Logfile.getInstance(configuration.getStringWithHome("Entity.Logfile"));
83 public EntityList(){ }
85 /* get/set EntityClass of Objects stored in EntityList */
86 public void setStorage(StorageObject storage) { this.theStorage=storage; }
87 public StorageObject getStorage() { return theStorage; }
89 public void setLimit(int limit) { this.limit = limit; }
92 * Sets the WHERE clause that fetched the Entities of this EntityList from the database.
93 * @param wc The string that contains the WHERE clause
95 public void setWhere(String wc) {
96 this.whereClause = wc;
100 * Returns the WHERE clause that returned this EntityList from the database
101 * @return whereClause The WHERE clause
103 public String getWhere() {
109 * Sets the sorting criterium of this EntityList
112 public void setOrder(String oc) {
113 this.orderClause = oc;
117 * Returns the sorting criterium.
118 * @return orderClause The sort order
120 public String getOrder() {
125 * Sets the number of rows that match the WHERE clause
126 * @param i The number of rows that match the WHERE clause
128 public void setCount(int i) {
133 * Returns the number of rows that match the WHERE clause
134 * @return The number of rows ...
136 public int getCount() {
142 * @param i The offset
144 public void setOffset(int i) {
152 public int getOffset() {
157 * Sets the offset of the next batch of Entities.
158 * @param i The next offset
160 public void setNextBatch(int i) {
165 * Returns the offset of the next batch of Entities.
166 * @return offset of the next batch
168 public int getNextBatch() {
173 * Returns whether there is a next batch within the WHERE clause
174 * @return true if yes, false if no.
176 public boolean hasNextBatch() {
177 return (offsetnext >= 0);
181 * Sets the offset of the previous batch.
182 * @param i the previous offset
184 public void setPrevBatch(int i) {
189 * Returns the offset of the previous batch.
190 * @return offset of the previous batch
192 public int getPrevBatch() {
197 * Returns whether there is a previous batch.
198 * @return true if yes, false if no
200 public boolean hasPrevBatch() {
201 return (offsetprev >= 0);
205 * Returns the start index of the batch.
208 public int getFrom() {
213 * Returns the end index of the batch.
224 * Inserts an Entity into the EntityList.
225 * @param anEntity The entity to be inserted.
228 public void add (Entity anEntity) {
230 theEntityArrayList.add(anEntity);
232 theLog.printWarning("EntityList: add called with empty Entity");
237 * @return The number of Entities in the EntityList.
241 return theEntityArrayList.size();
246 * Returns the element at position i in the EntityList as Entity
247 * @param i the position of the element in question
248 * @return The element at position i.
251 public Entity elementAt(int i) {
252 /** @todo check if i is in list.size() */
253 return (Entity)theEntityArrayList.get(i);
257 // The following methods have to be implemented
258 // for this class to be an implementation of the
259 // TemplateListModel of the Freemarker packages
261 public TemplateModel get(int i) { return elementAt(i); }
262 public boolean isRewound() { return (freemarkerListPointer==-1) ? true : false; }
263 public void rewind() { freemarkerListPointer=-1; }
265 public TemplateModel next() {
267 freemarkerListPointer++;return get(freemarkerListPointer); }
273 * Returns whether there is a next element
274 * @return true if there is a next element, else false
277 public boolean hasNext() {
278 return theEntityArrayList.size()>0 && freemarkerListPointer+2<=theEntityArrayList.size();
283 * Returns whether EntityList is empty or not
284 * @return true in case of empty list, false otherwise
287 public boolean isEmpty() {
288 if (theEntityArrayList!=null)
289 return theEntityArrayList.size()<1 ;
294 // Methods to implement StorableObject
296 public Set getNotifyOnReleaseSet() { return null; }
298 public StoreIdentifier getStoreIdentifier() {
299 if ( theStorage!=null ) {
301 new StoreIdentifier( this, StoreContainerType.STOC_TYPE_ENTITYLIST,
302 StoreUtil.getEntityListUniqueIdentifierFor( theStorage.getTableName(),
303 whereClause, orderClause, offset, limit ));
305 theLog.printWarning("EntityList could not return StoreIdentifier");