/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */

//
// This source code implements specifications defined by the Java
// Community Process. In order to remain compliant with the specification
// DO NOT add / change / or delete method signatures!
//

package javax.servlet.jsp;

/**
 * A generic exception known to the JSP engine; uncaught
 * JspExceptions will result in an invocation of the errorpage
 * machinery.
 */

public class JspException extends Exception {

    private Throwable rootCause;


    /**
     * Construct a JspException.
     */
    public JspException() {
    }


    /**
     * Constructs a new JSP exception with the
     * specified message. The message can be written 
     * to the server log and/or displayed for the user. 
     *
     * @param msg 		a <code>String</code> 
     *				specifying the text of 
     *				the exception message
     *
     */
    public JspException(String msg) {
	super(msg);
    }


    /**
     * Constructs a new JSP exception when the JSP 
     * needs to throw an exception and include a message 
     * about the "root cause" exception that interfered with its 
     * normal operation, including a description message.
     *
     *
     * @param message 		a <code>String</code> containing 
     *				the text of the exception message
     *
     * @param rootCause		the <code>Throwable</code> exception 
     *				that interfered with the servlet's
     *				normal operation, making this servlet
     *				exception necessary
     *
     */
    
    public JspException(String message, Throwable rootCause) {
	super(message);
	this.rootCause = rootCause;
    }


    /**
     * Constructs a new JSP exception when the JSP 
     * needs to throw an exception and include a message
     * about the "root cause" exception that interfered with its
     * normal operation.  The exception's message is based on the localized
     * message of the underlying exception.
     *
     * <p>This method calls the <code>getLocalizedMessage</code> method
     * on the <code>Throwable</code> exception to get a localized exception
     * message. When subclassing <code>JspException</code>, 
     * this method can be overridden to create an exception message 
     * designed for a specific locale.
     *
     * @param rootCause 	the <code>Throwable</code> exception
     * 				that interfered with the JSP's
     *				normal operation, making the JSP exception
     *				necessary
     *
     */

    public JspException(Throwable rootCause) {
	super(rootCause.getLocalizedMessage());
	this.rootCause = rootCause;
    }

    
    /**
     * Returns the exception that caused this JSP exception.
     *
     *
     * @return			the <code>Throwable</code> 
     *				that caused this JSP exception
     *
     */
    
    public Throwable getRootCause() {
	return rootCause;
    }
}