/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2002-2003 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 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 end-user documentation included with the redistribution, if
 *    any, must include the following acknowledgement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgement may appear in the software itself,
 *    if and wherever such third-party acknowledgements normally appear.
 *
 * 4. The names "The Jakarta Project", "Commons", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
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 *
 * 5. Products derived from this software may not be called "Apache"
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 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
package org.apache.commons.lang.exception;

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

/**
 * The base class of all errors which can contain other exceptions.
 *
 * @author <a href="mailto:dlr@finemaltcoding.com">Daniel Rall</a>
 * @see org.apache.commons.lang.exception.NestableException
 * @since 1.0
 * @version $Id: NestableError.java,v 1.7 2003/08/18 02:22:24 bayard Exp $
 */
public class NestableError extends Error implements Nestable {

    /**
     * The helper instance which contains much of the code which we
     * delegate to.
     */
    protected NestableDelegate delegate = new NestableDelegate(this);

    /**
     * Holds the reference to the exception or error that caused
     * this exception to be thrown.
     */
    private Throwable cause = null;

    /**
     * Constructs a new <code>NestableError</code> without specified
     * detail message.
     */
    public NestableError() {
        super();
    }

    /**
     * Constructs a new <code>NestableError</code> with specified
     * detail message.
     *
     * @param msg The error message.
     */
    public NestableError(String msg) {
        super(msg);
    }

    /**
     * Constructs a new <code>NestableError</code> with specified
     * nested <code>Throwable</code>.
     *
     * @param cause the exception or error that caused this exception to be
     * thrown
     */
    public NestableError(Throwable cause) {
        super();
        this.cause = cause;
    }

    /**
     * Constructs a new <code>NestableError</code> with specified
     * detail message and nested <code>Throwable</code>.
     *
     * @param msg    the error message
     * @param cause  the exception or error that caused this exception to be
     * thrown
     */
    public NestableError(String msg, Throwable cause) {
        super(msg);
        this.cause = cause;
    }

    public Throwable getCause() {
        return cause;
    }

    /**
     * Returns the detail message string of this throwable. If it was
     * created with a null message, returns the following:
     * (cause==null ? null : cause.toString()).
     */
    public String getMessage() {
        if (super.getMessage() != null) {
            return super.getMessage();
        } else if (cause != null) {
            return cause.toString();
        } else {
            return null;
        }
    }

    public String getMessage(int index) {
        if (index == 0) {
            return super.getMessage();
        } else {
            return delegate.getMessage(index);
        }
    }

    public String[] getMessages() {
        return delegate.getMessages();
    }

    public Throwable getThrowable(int index) {
        return delegate.getThrowable(index);
    }

    public int getThrowableCount() {
        return delegate.getThrowableCount();
    }

    public Throwable[] getThrowables() {
        return delegate.getThrowables();
    }

    public int indexOfThrowable(Class type) {
        return delegate.indexOfThrowable(type, 0);
    }

    public int indexOfThrowable(Class type, int fromIndex) {
        return delegate.indexOfThrowable(type, fromIndex);
    }

    public void printStackTrace() {
        delegate.printStackTrace();
    }

    public void printStackTrace(PrintStream out) {
        delegate.printStackTrace(out);
    }

    public void printStackTrace(PrintWriter out) {
        delegate.printStackTrace(out);
    }

    public final void printPartialStackTrace(PrintWriter out) {
        super.printStackTrace(out);
    }
}