/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2007, by Object Refinery Limited and Contributors.
*
* Project Info: http://www.jfree.org/jfreechart/index.html
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
* -----------------
* ChartDeleter.java
* -----------------
* (C) Copyright 2002-2007, by Richard Atkinson and Contributors.
*
* Original Author: Richard Atkinson;
* Contributor(s): -;
*
* Changes
* -------
* 19-Aug-2002 : Version 1;
* 17-Oct-2002 : Fixed errors reported by Checkstyle (DG);
* ------------- JFREECHART 1.0.x ---------------------------------------------
* 02-Feb-2007 : Removed author tags all over JFreeChart sources (DG);
*
*/
package org.jfree.chart.servlet;
import java.io.File;
import java.io.Serializable;
import java.util.Iterator;
import java.util.List;
import javax.servlet.http.HttpSessionBindingEvent;
import javax.servlet.http.HttpSessionBindingListener;
/**
* Used for deleting charts from the temporary directory when the users session
* expires.
*/
public class ChartDeleter implements HttpSessionBindingListener, Serializable {
/** The chart names. */
private List chartNames = new java.util.ArrayList();
/**
* Blank constructor.
*/
public ChartDeleter() {
super();
}
/**
* Add a chart to be deleted when the session expires
*
* @param filename the name of the chart in the temporary directory to be
* deleted.
*/
public void addChart(String filename) {
this.chartNames.add(filename);
}
/**
* Checks to see if a chart is in the list of charts to be deleted
*
* @param filename the name of the chart in the temporary directory.
*
* @return A boolean value indicating whether the chart is present in the
* list.
*/
public boolean isChartAvailable(String filename) {
return (this.chartNames.contains(filename));
}
/**
* Binding this object to the session has no additional effects.
*
* @param event the session bind event.
*/
public void valueBound(HttpSessionBindingEvent event) {
return;
}
/**
* When this object is unbound from the session (including upon session
* expiry) the files that have been added to the ArrayList are iterated
* and deleted.
*
* @param event the session unbind event.
*/
public void valueUnbound(HttpSessionBindingEvent event) {
Iterator iter = this.chartNames.listIterator();
while (iter.hasNext()) {
String filename = (String) iter.next();
File file = new File(
System.getProperty("java.io.tmpdir"), filename
);
if (file.exists()) {
file.delete();
}
}
return;
}
}
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