1 /* ================================================================
2 * Cewolf : Chart enabling Web Objects Framework
3 * ================================================================
5 * Project Info: http://cewolf.sourceforge.net
6 * Project Lead: Guido Laures (guido@laures.de);
8 * (C) Copyright 2002, by Guido Laures
10 * This library is free software; you can redistribute it and/or modify it under the terms
11 * of the GNU Lesser General Public License as published by the Free Software Foundation;
12 * either version 2.1 of the License, or (at your option) any later version.
14 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
15 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
16 * See the GNU Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public License along with this
19 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
20 * Boston, MA 02111-1307, USA.
23 package de.laures.cewolf.taglib.util;
25 import java.io.IOException;
26 import java.io.Serializable;
27 import java.rmi.MarshalledObject;
29 import org.apache.commons.logging.Log;
30 import org.apache.commons.logging.LogFactory;
33 * @author Guido Laures
35 public abstract class KeyGenerator {
37 private static final Log log = LogFactory.getLog(KeyGenerator.class);
39 private static class NoKeyException extends RuntimeException {
40 public NoKeyException(String msg){
45 public static int generateKey(Serializable obj) {
47 NoKeyException ex = new NoKeyException("assertion failed: can not generate key for null,");
51 MarshalledObject mo = new MarshalledObject(obj);
53 } catch (IOException ioex) {
54 log.error("IOException during key generation KeyGenerator.generateKey()", ioex);
55 throw new NoKeyException(obj + " is not serializable.");