001 /* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2008, by Object Refinery Limited and Contributors.
006 *
007 * Project Info: http://www.jfree.org/jfreechart/index.html
008 *
009 * This library is free software; you can redistribute it and/or modify it
010 * under the terms of the GNU Lesser General Public License as published by
011 * the Free Software Foundation; either version 2.1 of the License, or
012 * (at your option) any later version.
013 *
014 * This library is distributed in the hope that it will be useful, but
015 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
016 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
017 * License for more details.
018 *
019 * You should have received a copy of the GNU Lesser General Public
020 * License along with this library; if not, write to the Free Software
021 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
022 * USA.
023 *
024 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
025 * in the United States and other countries.]
026 *
027 * -----------------
028 * ChartDeleter.java
029 * -----------------
030 * (C) Copyright 2002-2008, by Richard Atkinson and Contributors.
031 *
032 * Original Author: Richard Atkinson;
033 * Contributor(s): -;
034 *
035 * Changes
036 * -------
037 * 19-Aug-2002 : Version 1;
038 * 17-Oct-2002 : Fixed errors reported by Checkstyle (DG);
039 * ------------- JFREECHART 1.0.x ---------------------------------------------
040 * 02-Feb-2007 : Removed author tags all over JFreeChart sources (DG);
041 *
042 */
043
044 package org.jfree.chart.servlet;
045
046 import java.io.File;
047 import java.io.Serializable;
048 import java.util.Iterator;
049 import java.util.List;
050
051 import javax.servlet.http.HttpSessionBindingEvent;
052 import javax.servlet.http.HttpSessionBindingListener;
053
054 /**
055 * Used for deleting charts from the temporary directory when the users session
056 * expires.
057 */
058 public class ChartDeleter implements HttpSessionBindingListener, Serializable {
059
060 /** The chart names. */
061 private List chartNames = new java.util.ArrayList();
062
063 /**
064 * Blank constructor.
065 */
066 public ChartDeleter() {
067 super();
068 }
069
070 /**
071 * Add a chart to be deleted when the session expires
072 *
073 * @param filename the name of the chart in the temporary directory to be
074 * deleted.
075 */
076 public void addChart(String filename) {
077 this.chartNames.add(filename);
078 }
079
080 /**
081 * Checks to see if a chart is in the list of charts to be deleted
082 *
083 * @param filename the name of the chart in the temporary directory.
084 *
085 * @return A boolean value indicating whether the chart is present in the
086 * list.
087 */
088 public boolean isChartAvailable(String filename) {
089 return (this.chartNames.contains(filename));
090 }
091
092 /**
093 * Binding this object to the session has no additional effects.
094 *
095 * @param event the session bind event.
096 */
097 public void valueBound(HttpSessionBindingEvent event) {
098 return;
099 }
100
101 /**
102 * When this object is unbound from the session (including upon session
103 * expiry) the files that have been added to the ArrayList are iterated
104 * and deleted.
105 *
106 * @param event the session unbind event.
107 */
108 public void valueUnbound(HttpSessionBindingEvent event) {
109
110 Iterator iter = this.chartNames.listIterator();
111 while (iter.hasNext()) {
112 String filename = (String) iter.next();
113 File file = new File(
114 System.getProperty("java.io.tmpdir"), filename
115 );
116 if (file.exists()) {
117 file.delete();
118 }
119 }
120 return;
121
122 }
123
124 }