001package org.cache2k.impl;
002
003/*
004 * #%L
005 * cache2k core package
006 * %%
007 * Copyright (C) 2000 - 2015 headissue GmbH, Munich
008 * %%
009 * This program is free software: you can redistribute it and/or modify
010 * it under the terms of the GNU General Public License as
011 * published by the Free Software Foundation, either version 3 of the 
012 * License, or (at your option) any later version.
013 * 
014 * This program is distributed in the hope that it will be useful,
015 * but WITHOUT ANY WARRANTY; without even the implied warranty of
016 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
017 * GNU General Public License for more details.
018 * 
019 * You should have received a copy of the GNU General Public 
020 * License along with this program.  If not, see
021 * <http://www.gnu.org/licenses/gpl-3.0.html>.
022 * #L%
023 */
024
025/**
026 * We use instances of the exception wrapper for the value field in the entry.
027 * This way we can store exceptions without needing additional memory, if no exceptions
028 * happen.
029 *
030 * @author Jens Wilke; created: 2013-07-12
031 */
032public class ExceptionWrapper {
033
034  Throwable exception;
035
036  /**
037   * Store an additional exception message with the expiry time.
038   * Gets lazily set as soon as an exception is thrown.
039   */
040  transient String additionalExceptionMessage = null;
041
042  public ExceptionWrapper(Throwable ex) {
043    exception = ex;
044  }
045
046  public Throwable getException() {
047    return exception;
048  }
049
050  public String toString() {
051    return exception.toString();
052  }
053
054}