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 * $Id: ChartDeleter.java,v 1.2.2.3 2007/02/02 15:03:19 mungady Exp $
036 *
037 * Changes
038 * -------
039 * 19-Aug-2002 : Version 1;
040 * 17-Oct-2002 : Fixed errors reported by Checkstyle (DG);
041 * ------------- JFREECHART 1.0.x ---------------------------------------------
042 * 02-Feb-2007 : Removed author tags all over JFreeChart sources (DG);
043 *
044 */
045 package org.jfree.chart.servlet;
046
047 import java.io.File;
048 import java.io.Serializable;
049 import java.util.Iterator;
050 import java.util.List;
051
052 import javax.servlet.http.HttpSessionBindingEvent;
053 import javax.servlet.http.HttpSessionBindingListener;
054
055 /**
056 * Used for deleting charts from the temporary directory when the users session
057 * expires.
058 */
059 public class ChartDeleter implements HttpSessionBindingListener, Serializable {
060
061 /** The chart names. */
062 private List chartNames = new java.util.ArrayList();
063
064 /**
065 * Blank constructor.
066 */
067 public ChartDeleter() {
068 super();
069 }
070
071 /**
072 * Add a chart to be deleted when the session expires
073 *
074 * @param filename the name of the chart in the temporary directory to be
075 * deleted.
076 */
077 public void addChart(String filename) {
078 this.chartNames.add(filename);
079 }
080
081 /**
082 * Checks to see if a chart is in the list of charts to be deleted
083 *
084 * @param filename the name of the chart in the temporary directory.
085 *
086 * @return A boolean value indicating whether the chart is present in the
087 * list.
088 */
089 public boolean isChartAvailable(String filename) {
090 return (this.chartNames.contains(filename));
091 }
092
093 /**
094 * Binding this object to the session has no additional effects.
095 *
096 * @param event the session bind event.
097 */
098 public void valueBound(HttpSessionBindingEvent event) {
099 return;
100 }
101
102 /**
103 * When this object is unbound from the session (including upon session
104 * expiry) the files that have been added to the ArrayList are iterated
105 * and deleted.
106 *
107 * @param event the session unbind event.
108 */
109 public void valueUnbound(HttpSessionBindingEvent event) {
110
111 Iterator iter = this.chartNames.listIterator();
112 while (iter.hasNext()) {
113 String filename = (String) iter.next();
114 File file = new File(
115 System.getProperty("java.io.tmpdir"), filename
116 );
117 if (file.exists()) {
118 file.delete();
119 }
120 }
121 return;
122
123 }
124
125 }