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/* 
 * This file is part of the Echo Web Application Framework (hereinafter "Echo").
 * Copyright (C) 2002-2009 NextApp, Inc.
 *
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (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.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 */

package nextapp.echo2.webrender;

/**
 * A generic runtime exception to handle circumstances that should
 * almost never happen.  This class should be used to wrap checked exceptions
 * that shouldn't be possible to occur, instead of swallowing them.
 */
public class WebRenderServletException extends RuntimeException {

    private Throwable cause;
    
    /**
     * Creates a new EchoServletException with a description of its cause.
     *
     * @param message A message describing the exception.
     */
    public WebRenderServletException(String message) {
        super(message);
        
        cause = this;
    }

    /**
     * Creates a new EchoServletException with a description of its cause that
     * wraps another exception.
     *
     * @param message A message describing the exception.
     * @param cause The exception which caused this exception to be thrown.
     */
    public WebRenderServletException(String message, Throwable cause) {
        super(message);
        
        this.cause = cause;
    }
    
    /**
     * Returns the wrapped exception that caused this exception to be thrown.
     * If the root cause was not a wrapped exception or is this object, null
     * is returned.
     *
     * @return The cause of this exception.
     */
    public Throwable getCause() {
        return cause == this ? null : cause;
    }
}