/**
 * Copyright 2010 JBoss Inc
 *
 * 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.eclipse.webdav.internal.kernel;

public class DAV4JRuntimeException extends RuntimeException {

	/**
	 * Comment for <code>serialVersionUID</code>
	 */
	private static final long serialVersionUID = 510l;

	// The wrapped exception, if one exists
	private Throwable fWrappedException = null;

	// The status code for the exception
	private int fErrorCode = 0;

	/**
	 * Create and answer a new runtime exception with the specified error code
	 * and descriptive message.
	 *
	 * @param code the error code for the exception
	 * @param message a string describing the exception
	 */
	public DAV4JRuntimeException(int code, String message) {
		super(message);
		setErrorCode(code);
	}

	/**
	 * Create and answer a new runtime exception with the given
	 * descriptive message.
	 *
	 * @param message a string describing the exception
	 */
	public DAV4JRuntimeException(String message) {
		super(message);
	}

	/**
	 * Create and answer a runtime exception which wraps the given
	 * exception.
	 */
	public DAV4JRuntimeException(Throwable exception) {
		super();
		if (exception instanceof DAV4JRuntimeException)
			setWrappedException(((DAV4JRuntimeException) exception).getWrappedException());
		else
			setWrappedException(exception);
	}

	/**
	 * Makes the same association between exception argument and error code as 
	 * <code>DAV4JRuntimeException(Exception)</code>
	 *
	 * @param exception the exception to wrap
	 * @param message a string describing the exception
	 */
	public DAV4JRuntimeException(Throwable exception, String message) {
		super(message + "\n " + Policy.bind("label.exceptionMessage") + exception.getMessage()); //$NON-NLS-1$ //$NON-NLS-2$
		setWrappedException(exception);
	}

	/**
	 * Answer the error code which is set on the receiver. If the receiver
	 * wraps a DAV4JException, then get the error code from the wrapped
	 * exception.
	 */
	public int getErrorCode() {
		if (getWrappedException() != null && getWrappedException() instanceof DAV4JRuntimeException)
			return ((DAV4JRuntimeException) getWrappedException()).getErrorCode();
		return fErrorCode;
	}

	/**
	 * Answer the receiver's field which holds onto the exception
	 * which the receiver wraps.
	 *
	 * @return the wrapped exception
	 */
	public Throwable getWrappedException() {
		return fWrappedException;
	}

	/**
	 * If the receiver wraps an exception, then ask the exception to
	 * print out a stack trace to the system output.
	 */
	public void printStackTrace() {
		Throwable wrappedException = getWrappedException();
		if (wrappedException != null)
			wrappedException.printStackTrace();
		else
			super.printStackTrace();
	}

	/**
	 * Set the receiver's field which holds onto the error code.
	 *
	 * @param errorCode the error code for the exception
	 */
	protected void setErrorCode(int errorCode) {
		fErrorCode = errorCode;
	}

	/**
	 * Set the receiver's field which holds onto the wrapped exception.
	 *
	 * @param exception the exception to be wrapped
	 */
	protected void setWrappedException(Throwable exception) {
		fWrappedException = exception;
	}
}