/**
 * Redistribution and use of this software and associated documentation
 * ("Software"), with or without modification, are permitted provided
 * that the following conditions are met:
 *
 * 1. Redistributions of source code must retain copyright
 *    statements and notices.  Redistributions must also contain a
 *    copy of this document.
 *
 * 2. Redistributions in binary form must reproduce the
 *    above copyright notice, this list of conditions and the
 *    following disclaimer in the documentation and/or other
 *    materials provided with the distribution.
 *
 * 3. The name "Exolab" must not be used to endorse or promote
 *    products derived from this Software without prior written
 *    permission of Intalio, Inc.  For written permission,
 *    please contact info@exolab.org.
 *
 * 4. Products derived from this Software may not be called "Exolab"
 *    nor may "Exolab" appear in their names without prior written
 *    permission of Intalio, Inc. Exolab is a registered
 *    trademark of Intalio, Inc.
 *
 * 5. Due credit should be given to the Exolab Project
 *    (http://www.exolab.org/).
 *
 * THIS SOFTWARE IS PROVIDED BY INTALIO, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
 * INTALIO, INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Copyright 2001 (C) Intalio, Inc. All Rights Reserved.
 *
 * $Id$
 */
package org.exolab.castor.jdo;

import java.io.PrintStream;
import java.io.PrintWriter;

/**
 * An exception encapsulating another exception which occurs during
 * operation to data object.
 *
 * @author <a href="gignoux@intalio.com">Sebastien Gignoux</a>
 * @version $Revision$ $Date: 2006-02-23 13:49:30 -0700 (Thu, 23 Feb 2006) $
 */
public class DataObjectAccessException extends RuntimeException {
    /** SerialVersionUID. */
    private static final long serialVersionUID = -6741547483776196810L;

    /** The cause for this exception. */
    private Throwable _cause;

    /**
     * Creates an instance of this exception.
     * 
     * @param message The error message.
     * @param cause The original excepton.
     */
    public DataObjectAccessException(final String message, final Throwable cause) {
        super(message);
        _cause = cause;
    }

    /**
     * Creates an instance of this exception.
     * 
     * @param message The error message.
     */
    public DataObjectAccessException(final String message) {
        super(message);
    }

    /**
     * Match the JDK 1.4 Throwable version of getCause() on JDK<1.4 systems.
     * 
     * @return The throwable cause of this exception.
     */
    public final Throwable getCause() {
        return _cause;
    }
    
    /**
     * Print a stack trace to stderr.
     */
    public final void printStackTrace() {
        // Print the stack trace for this exception.
        super.printStackTrace();

        if (_cause != null) {
            System.err.print("Caused by: ");
            _cause.printStackTrace();
        }
    }

    /**
     * Print a stack trace to the specified PrintStream.
     * 
     * @param s The PrintStream to print a stack trace to.
     */
    public final void printStackTrace(final PrintStream s) {
        // Print the stack trace for this exception.
        super.printStackTrace(s);

        if (_cause != null) {
            s.print("Caused by: ");
            _cause.printStackTrace(s);
        }
    }

    /**
     * Print a stack trace to the specified PrintWriter.
     * 
     * @param w The PrintWriter to print a stack trace to.
     */
    public final void printStackTrace(final PrintWriter w) {
        // Print the stack trace for this exception.
        super.printStackTrace(w);

        if (_cause != null) {
            w.print("Caused by: ");
            _cause.printStackTrace(w);
        }
    }
}