Source Code Cross Referenced for SetImpl.java in  » EJB-Server-resin-3.1.5 » resin » com » caucho » amber » collection » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » EJB Server resin 3.1.5 » resin » com.caucho.amber.collection 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
003:         *
004:         * This file is part of Resin(R) Open Source
005:         *
006:         * Each copy or derived work must preserve the copyright notice and this
007:         * notice unmodified.
008:         *
009:         * Resin Open Source is free software; you can redistribute it and/or modify
010:         * it under the terms of the GNU General Public License as published by
011:         * the Free Software Foundation; either version 2 of the License, or
012:         * (at your option) any later version.
013:         *
014:         * Resin Open Source is distributed in the hope that it will be useful,
015:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
016:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
017:         * of NON-INFRINGEMENT.  See the GNU General Public License for more
018:         * details.
019:         *
020:         * You should have received a copy of the GNU General Public License
021:         * along with Resin Open Source; if not, write to the
022:         *
023:         *   Free Software Foundation, Inc.
024:         *   59 Temple Place, Suite 330
025:         *   Boston, MA 02111-1307  USA
026:         *
027:         * @author Scott Ferguson
028:         */
029:
030:        package com.caucho.amber.collection;
031:
032:        import com.caucho.amber.AmberQuery;
033:        import com.caucho.amber.AmberRuntimeException;
034:        import com.caucho.amber.manager.AmberConnection;
035:        import com.caucho.amber.query.UserQuery;
036:        import com.caucho.util.Alarm;
037:
038:        import java.sql.SQLException;
039:        import java.util.AbstractSet;
040:        import java.util.ArrayList;
041:        import java.util.Collection;
042:        import java.util.Iterator;
043:
044:        /**
045:         * Represents a lazy collection.
046:         */
047:        public class SetImpl<E> extends AbstractSet<E> implements 
048:                AmberCollection {
049:            private AmberQuery _query;
050:
051:            private AmberConnection _aConn;
052:
053:            private ArrayList<E> _values = new ArrayList<E>();
054:            private long _expireTime;
055:
056:            public SetImpl(AmberConnection aConn, String query) {
057:                _aConn = aConn;
058:
059:                if (_query != null) {
060:                    try {
061:                        _query = _aConn.prepareQuery(query);
062:                    } catch (SQLException e) {
063:                        throw new AmberRuntimeException(e);
064:                    }
065:                }
066:            }
067:
068:            public SetImpl(AmberQuery query) {
069:                _query = query;
070:
071:                if (query != null)
072:                    setSession(((UserQuery) _query).getConnection());
073:            }
074:
075:            /**
076:             * Sets the session.
077:             */
078:            public void setSession(com.caucho.amber.AmberConnection aConn) {
079:                throw new UnsupportedOperationException();
080:                // setSession(((UserAmberConnection) aConn).getManagedConnection());
081:            }
082:
083:            /**
084:             * Sets the session.
085:             */
086:            public void setSession(AmberConnection aConn) {
087:                _aConn = aConn;
088:
089:                // jpa/0j62
090:                if (aConn != null)
091:                    _aConn.register(this );
092:            }
093:
094:            /**
095:             * Returns the session.
096:             */
097:            public AmberConnection getSession() {
098:                return _aConn;
099:            }
100:
101:            /**
102:             * Returns the query.
103:             */
104:            public AmberQuery getQuery() {
105:                return _query;
106:            }
107:
108:            /**
109:             * Returns the number of items in the collection.
110:             */
111:            public int size() {
112:                fill();
113:
114:                return _values.size();
115:            }
116:
117:            /**
118:             * Returns an iterator of the items.
119:             */
120:            public Iterator iterator() {
121:                fill();
122:
123:                return new ValuesIterator(_values);
124:            }
125:
126:            /**
127:             * Returns an iterator of the items.
128:             */
129:            public E get(int index) {
130:                fill();
131:
132:                return _values.get(index);
133:            }
134:
135:            /**
136:             * Adds all items to this collection.
137:             */
138:            public boolean addAll(Collection<? extends E> collection) {
139:                fill();
140:
141:                return _values.addAll(collection);
142:            }
143:
144:            /**
145:             * Clears the collection.
146:             */
147:            public void clear() {
148:                _values.clear();
149:                _expireTime = Alarm.getCurrentTime();
150:            }
151:
152:            /**
153:             * Updates the collection.
154:             */
155:            public void update() {
156:                _expireTime = 0;
157:            }
158:
159:            protected boolean isValid() {
160:                return Alarm.getCurrentTime() <= _expireTime;
161:            }
162:
163:            private void fill() {
164:                if (_query == null)
165:                    return;
166:
167:                // If it is detached should not be updated.
168:                if (_aConn == null)
169:                    return;
170:
171:                if (Alarm.getCurrentTime() <= _expireTime)
172:                    return;
173:
174:                try {
175:                    _expireTime = Alarm.getCurrentTime();
176:
177:                    ((UserQuery) _query).setSession(_aConn);
178:                    _values.clear();
179:                    _query.list((ArrayList) _values);
180:                } catch (SQLException e) {
181:                    throw new AmberRuntimeException(e);
182:                }
183:            }
184:
185:            class ValuesIterator implements  Iterator {
186:                private ArrayList<E> _values;
187:                private int i = 0;
188:
189:                ValuesIterator(ArrayList<E> values) {
190:                    _values = new ArrayList<E>(values);
191:                }
192:
193:                public boolean hasNext() {
194:                    return i < _values.size();
195:                }
196:
197:                public Object next() {
198:                    if (i < _values.size())
199:                        return _values.get(i++);
200:                    else
201:                        return null;
202:                }
203:
204:                public void remove() {
205:                    SetImpl.this .remove(_values.get(i - 1));
206:                }
207:            }
208:        }
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