diff -r 1612dbcec451 -r 639991d0808a java/cewolf-1.0/src/main/java/de/laures/cewolf/storage/FileStorage.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/java/cewolf-1.0/src/main/java/de/laures/cewolf/storage/FileStorage.java	Sat Feb 28 21:31:02 2009 +0100
@@ -0,0 +1,175 @@
+/* ================================================================
+ * Cewolf : Chart enabling Web Objects Framework
+ * ================================================================
+ *
+ * Project Info:  http://cewolf.sourceforge.net
+ * Project Lead:  Guido Laures (guido@laures.de);
+ *
+ * (C) Copyright 2002, by Guido Laures
+ *
+ * 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., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+package de.laures.cewolf.storage;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.servlet.ServletContext;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.jsp.PageContext;
+
+import de.laures.cewolf.CewolfException;
+import de.laures.cewolf.ChartImage;
+import de.laures.cewolf.Configuration;
+import de.laures.cewolf.Storage;
+import de.laures.cewolf.taglib.util.KeyGenerator;
+
+/**
+ * Storage for storing images as files in the web application directory as files _chart-XXXXX.
+ * Note that by default the files won't ever be removed. To remove saved images on VM exit set
+ * the <code>FileStorage.deleteOnExit</code> configuration parameter to "true". For example:
+ * 
+ * <pre>
+ *		<init-param>
+ *			<param-name>storage</param-name>
+ *			<param-value>de.laures.cewolf.storage.FileStorage</param-value>
+ *		</init-param>
+ *		<init-param>
+ *				<param-name>FileStorage.deleteOnExit</param-name>
+ *				<param-value>true</param-value>
+ *		</init-param> 
+ *	</pre> 
+ * 
+ * @author guido
+ */
+public class FileStorage implements Storage {
+	
+	String basePath = null;
+	List stored = new ArrayList();
+	private boolean deleteOnExit = false;
+
+	/**
+	 * @see de.laures.cewolf.Storage#storeChartImage(ChartImage, PageContext)
+	 */
+	public String storeChartImage(ChartImage cid, PageContext pageContext) {
+		if(contains(cid, pageContext)){
+			return getKey(cid);
+		}
+		String id = getKey(cid);
+		ObjectOutputStream oos = null;
+		try {
+			String fileName = getFileName(id);
+			pageContext.getServletContext().log("Storing image to file " + fileName);
+			File f = new File(fileName);
+			if (deleteOnExit) {
+				f.deleteOnExit();			
+			}
+			oos = new ObjectOutputStream(new FileOutputStream(f));
+			oos.writeObject(new SerializableChartImage(cid));
+			oos.close();
+		} catch(IOException ioex){
+			ioex.printStackTrace();
+		} catch(CewolfException cwex){
+			cwex.printStackTrace();
+		} finally {
+			if(oos != null){
+				try {
+					oos.close();
+				} catch(IOException ioex){
+					ioex.printStackTrace();
+				}
+			}
+		}
+		return id;		
+	}
+
+	/**
+	 * @see de.laures.cewolf.Storage#getChartImage(String, HttpServletRequest)
+	 */
+	public ChartImage getChartImage(String id, HttpServletRequest request) {
+		ChartImage res = null;
+		ObjectInputStream ois = null;
+		try {
+			ois = new ObjectInputStream(new FileInputStream(getFileName(id)));
+			res = (ChartImage)ois.readObject();
+			ois.close();
+		} catch(Exception ex){
+			ex.printStackTrace();
+		} finally {
+			if(ois != null){
+				try {
+					ois.close();
+				} catch(IOException ioex){
+					ioex.printStackTrace();
+				}
+			}
+		}
+		return res;
+	}
+
+	/**
+	 * @see de.laures.cewolf.Storage#contains(ChartImage, PageContext)
+	 */
+	public boolean contains(ChartImage chartImage, PageContext pageContext) {
+		return new File(getFileName(chartImage)).exists();
+	}
+
+	/**
+	 * @see de.laures.cewolf.Storage#getKey(ChartImage)
+	 */
+	public String getKey(ChartImage chartImage) {
+		return String.valueOf(KeyGenerator.generateKey((Serializable)chartImage));
+	}
+
+	/**
+	 * @see de.laures.cewolf.Storage#init(ServletContext)
+	 */
+	public void init(ServletContext servletContext) throws CewolfException {
+		basePath = servletContext.getRealPath("/");
+		Configuration config = Configuration.getInstance(servletContext);
+		deleteOnExit = "true".equalsIgnoreCase("" + config.getParameters().get("FileStorage.deleteOnExit"));
+		servletContext.log("FileStorage initialized, deleteOnExit=" + deleteOnExit);
+	}
+	
+	private String getFileName(ChartImage chartImage){
+		return getFileName(getKey(chartImage));
+	}
+
+	private String getFileName(String id){
+		return basePath + "_chart" + id;
+	}
+
+	/**
+	 * @see de.laures.cewolf.Storage#removeChartImage(java.lang.String, javax.servlet.jsp.PageContext)
+	 */
+	public String removeChartImage(String imgKey, HttpServletRequest pageContext) throws CewolfException {
+		File file = new File(getFileName(imgKey));
+		if (file.exists())
+		{
+			if (!file.delete())
+			{
+				throw new CewolfException("Could not delete file " + file.getAbsolutePath());
+			}
+		}
+		return imgKey;
+	}
+
+}