stackableruntimeexception.java

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/* ===================================================
 * JCommon : a free general purpose Java class library
 * ===================================================
 *
 * Project Info:  http://www.jfree.org/jcommon/index.html
 * Project Lead:  David Gilbert ([e-mail]);
 *
 * (C) Copyright 2000-2003, by Object Refinery Limited and Contributors.
 *
 * 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.
 *
 * ------------------------------
 * StackableRuntimeException.java
 * ------------------------------
 * (C)opyright 2002, by Thomas Morgner and Contributors.
 *
 * Original Author:  Thomas Morgner;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * $Id: StackableRuntimeException.java,v 1.3 2003/06/03 22:35:18 mungady Exp $
 *
 * Changes
 * -------
 * 06-Dec-2002 : Initial version
 * 10-Dec-2002 : Fixed issues reported by Checkstyle (DG);
 * 29-Apr-2003 : Destilled from the JFreeReport project and moved into JCommon
 *
 */

package org.jfree.util;

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

/**
 * A baseclass for RuntimeExceptions, which could have parent exceptions. These parent exceptions
 * are raised in a subclass and are now wrapped into a subclass of this Exception.
 * <p>
 * The parents are printed when this exception is printed. This class exists mainly for
 * debugging reasons, as with them it is easier to detect the root cause of an error.
 *
 * @author Thomas Morgner
 */
public class StackableRuntimeException extends RuntimeException {

    /** The parent exception. */
    private Exception parent;

    /**
     * Creates a StackableRuntimeException with no message and no parent.
     */
    public StackableRuntimeException() {
    }

    /**
     * Creates an exception.
     *
     * @param message  the exception message.
     * @param ex  the parent exception.
     */
    public StackableRuntimeException(String message, Exception ex) {
        super(message);
        parent = ex;
    }

    /**
     * Creates an exception.
     *
     * @param message  the exception message.
     */
    public StackableRuntimeException(String message) {
        super(message);
    }

    /**
     * Returns the parent exception (possibly null).
     *
     * @return the parent exception.
     */
    public Exception getParent() {
        return parent;
    }

    /**
     * Prints the stack trace to the specified stream.
     *
     * @param stream  the output stream.
     */
    public void printStackTrace(PrintStream stream) {
        super.printStackTrace(stream);
        if (getParent() != null) {
            stream.println("ParentException: ");
            getParent().printStackTrace(stream);
        }
    }

    /**
     * Prints the stack trace to the specified writer.
     *
     * @param writer  the writer.
     */
    public void printStackTrace(PrintWriter writer) {
        super.printStackTrace(writer);
        if (getParent() != null) {
            writer.println("ParentException: ");
            getParent().printStackTrace(writer);
        }
    }

}