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 }