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1: /* =========================================================== 2: * JFreeChart : a free chart library for the Java(tm) platform 3: * =========================================================== 4: * 5: * (C) Copyright 2000-2005, 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 2002-2004, by Richard Atkinson and Contributors. 31: * 32: * Original Author: Richard Atkinson; 33: * Contributor(s): -; 34: * 35: * $Id: ChartDeleter.java,v 1.2.2.1 2005/10/25 20:58:06 mungady Exp $ 36: * 37: * Changes 38: * ------- 39: * 19-Aug-2002 : Version 1; 40: * 17-Oct-2002 : Fixed errors reported by Checkstyle (DG); 41: * 42: */ 43: package org.jfree.chart.servlet; 44: 45: import java.io.File; 46: import java.util.Iterator; 47: import java.util.List; 48: 49: import javax.servlet.http.HttpSessionBindingEvent; 50: import javax.servlet.http.HttpSessionBindingListener; 51: 52: /** 53: * Used for deleting charts from the temporary directory when the users session 54: * expires. 55: * 56: * @author Richard Atkinson 57: */ 58: public class ChartDeleter implements HttpSessionBindingListener { 59: 60: /** The chart names. */ 61: private List chartNames = new java.util.ArrayList(); 62: 63: /** 64: * Blank constructor. 65: */ 66: public ChartDeleter() { 67: super(); 68: } 69: 70: /** 71: * Add a chart to be deleted when the session expires 72: * 73: * @param filename the name of the chart in the temporary directory to be 74: * deleted. 75: */ 76: public void addChart(String filename) { 77: this.chartNames.add(filename); 78: } 79: 80: /** 81: * Checks to see if a chart is in the list of charts to be deleted 82: * 83: * @param filename the name of the chart in the temporary directory. 84: * 85: * @return A boolean value indicating whether the chart is present in the 86: * list. 87: */ 88: public boolean isChartAvailable(String filename) { 89: return (this.chartNames.contains(filename)); 90: } 91: 92: /** 93: * Binding this object to the session has no additional effects. 94: * 95: * @param event the session bind event. 96: */ 97: public void valueBound(HttpSessionBindingEvent event) { 98: return; 99: } 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: }