001 /* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2007, 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 2002-2007, 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 package org.jfree.chart.servlet;
044
045 import java.io.File;
046 import java.io.Serializable;
047 import java.util.Iterator;
048 import java.util.List;
049
050 import javax.servlet.http.HttpSessionBindingEvent;
051 import javax.servlet.http.HttpSessionBindingListener;
052
053 /**
054 * Used for deleting charts from the temporary directory when the users session
055 * expires.
056 */
057 public class ChartDeleter implements HttpSessionBindingListener, Serializable {
058
059 /** The chart names. */
060 private List chartNames = new java.util.ArrayList();
061
062 /**
063 * Blank constructor.
064 */
065 public ChartDeleter() {
066 super();
067 }
068
069 /**
070 * Add a chart to be deleted when the session expires
071 *
072 * @param filename the name of the chart in the temporary directory to be
073 * deleted.
074 */
075 public void addChart(String filename) {
076 this.chartNames.add(filename);
077 }
078
079 /**
080 * Checks to see if a chart is in the list of charts to be deleted
081 *
082 * @param filename the name of the chart in the temporary directory.
083 *
084 * @return A boolean value indicating whether the chart is present in the
085 * list.
086 */
087 public boolean isChartAvailable(String filename) {
088 return (this.chartNames.contains(filename));
089 }
090
091 /**
092 * Binding this object to the session has no additional effects.
093 *
094 * @param event the session bind event.
095 */
096 public void valueBound(HttpSessionBindingEvent event) {
097 return;
098 }
099
100 /**
101 * When this object is unbound from the session (including upon session
102 * expiry) the files that have been added to the ArrayList are iterated
103 * and deleted.
104 *
105 * @param event the session unbind event.
106 */
107 public void valueUnbound(HttpSessionBindingEvent event) {
108
109 Iterator iter = this.chartNames.listIterator();
110 while (iter.hasNext()) {
111 String filename = (String) iter.next();
112 File file = new File(
113 System.getProperty("java.io.tmpdir"), filename
114 );
115 if (file.exists()) {
116 file.delete();
117 }
118 }
119 return;
120
121 }
122
123 }