/* ====================================================================   Copyright 2002-2004   Apache Software Foundation   Licensed under the Apache License, Version 2.0 (the "License");   you may not use this file except in compliance with the License.   You may obtain a copy of the License at       http://www.apache.org/licenses/LICENSE-2.0   Unless required by applicable law or agreed to in writing, software   distributed under the License is distributed on an "AS IS" BASIS,   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   See the License for the specific language governing permissions and   limitations under the License.==================================================================== */        package org.apache.poi.hpsf;import java.io.PrintStream;import java.io.PrintWriter;/** * <p>This exception is the superclass of all other unchecked * exceptions thrown in this package. It supports a nested "reason" * throwable, i.e. an exception that caused this one to be thrown.</p> * * @author Rainer Klute <a * href="mailto:klute@rainer-klute.de">&lt;klute@rainer-klute.de&gt;</a> * @version $Id: HPSFRuntimeException.java,v 1.9 2004/04/09 13:05:16 glens Exp $ * @since 2002-02-09 */public class HPSFRuntimeException extends RuntimeException{    /** <p>The underlying reason for this exception - may be     * <code>null</code>.</p> */    private Throwable reason;    /**     * <p>Creates a new {@link HPSFRuntimeException}.</p>     */    public HPSFRuntimeException()    {        super();    }    /**     * <p>Creates a new {@link HPSFRuntimeException} with a message     * string.</p>     *     * @param msg The message string.     */    public HPSFRuntimeException(final String msg)    {        super(msg);    }    /**     * <p>Creates a new {@link HPSFRuntimeException} with a     * reason.</p>     *     * @param reason The reason, i.e. a throwable that indirectly     * caused this exception.     */    public HPSFRuntimeException(final Throwable reason)    {        super();        this.reason = reason;    }    /**     * <p>Creates a new {@link HPSFRuntimeException} with a message     * string and a reason.</p>     *     * @param msg The message string.     * @param reason The reason, i.e. a throwable that indirectly     * caused this exception.     */    public HPSFRuntimeException(final String msg, final Throwable reason)    {        super(msg);        this.reason = reason;    }    /**     * <p>Returns the {@link Throwable} that caused this exception to     * be thrown or <code>null</code> if there was no such {@link     * Throwable}.</p>     *     * @return The reason     */    public Throwable getReason()    {        return reason;    }    /**     * @see Throwable#printStackTrace()     */    public void printStackTrace()    {        printStackTrace(System.err);    }    /**     * @see Throwable#printStackTrace(java.io.PrintStream)     */    public void printStackTrace(final PrintStream p)    {        final Throwable reason = getReason();        super.printStackTrace(p);        if (reason != null)        {            p.println("Caused by:");            reason.printStackTrace(p);        }    }    /**     * @see Throwable#printStackTrace(java.io.PrintWriter)     */    public void printStackTrace(final PrintWriter p)    {        final Throwable reason = getReason();        super.printStackTrace(p);        if (reason != null)        {            p.println("Caused by:");            reason.printStackTrace(p);        }    }}