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1: /* =========================================================== 2: * JFreeChart : a free chart library for the Java(tm) platform 3: * =========================================================== 4: * 5: * (C) Copyright 2000-2007, by Object Refinery Limited and Contributors. 6: * 7: * Project Info: http://www.jfree.org/jfreechart/index.html 8: * 9: * This library is free software; you can redistribute it and/or modify it 10: * under the terms of the GNU Lesser General Public License as published by 11: * the Free Software Foundation; either version 2.1 of the License, or 12: * (at your option) any later version. 13: * 14: * This library is distributed in the hope that it will be useful, but 15: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 16: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 17: * License for more details. 18: * 19: * You should have received a copy of the GNU Lesser General Public 20: * License along with this library; if not, write to the Free Software 21: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 22: * USA. 23: * 24: * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 25: * in the United States and other countries.] 26: * 27: * ----------------- 28: * ChartDeleter.java 29: * ----------------- 30: * (C) Copyright 2002-2007, by Richard Atkinson and Contributors. 31: * 32: * Original Author: Richard Atkinson; 33: * Contributor(s): -; 34: * 35: * Changes 36: * ------- 37: * 19-Aug-2002 : Version 1; 38: * 17-Oct-2002 : Fixed errors reported by Checkstyle (DG); 39: * ------------- JFREECHART 1.0.x --------------------------------------------- 40: * 02-Feb-2007 : Removed author tags all over JFreeChart sources (DG); 41: * 42: */ 43: package org.jfree.chart.servlet; 44: 45: import java.io.File; 46: import java.io.Serializable; 47: import java.util.Iterator; 48: import java.util.List; 49: 50: import javax.servlet.http.HttpSessionBindingEvent; 51: import javax.servlet.http.HttpSessionBindingListener; 52: 53: /** 54: * Used for deleting charts from the temporary directory when the users session 55: * expires. 56: */ 57: public class ChartDeleter implements HttpSessionBindingListener, Serializable { 58: 59: /** The chart names. */ 60: private List chartNames = new java.util.ArrayList(); 61: 62: /** 63: * Blank constructor. 64: */ 65: public ChartDeleter() { 66: super(); 67: } 68: 69: /** 70: * Add a chart to be deleted when the session expires 71: * 72: * @param filename the name of the chart in the temporary directory to be 73: * deleted. 74: */ 75: public void addChart(String filename) { 76: this.chartNames.add(filename); 77: } 78: 79: /** 80: * Checks to see if a chart is in the list of charts to be deleted 81: * 82: * @param filename the name of the chart in the temporary directory. 83: * 84: * @return A boolean value indicating whether the chart is present in the 85: * list. 86: */ 87: public boolean isChartAvailable(String filename) { 88: return (this.chartNames.contains(filename)); 89: } 90: 91: /** 92: * Binding this object to the session has no additional effects. 93: * 94: * @param event the session bind event. 95: */ 96: public void valueBound(HttpSessionBindingEvent event) { 97: return; 98: } 99: 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: }