/**
 * $RCSfile$
 * $Revision$
 * $Date$
 *
 * Copyright (C) 2002-2003 Jive Software. All rights reserved.
 * ====================================================================
 * The Jive Software License (based on Apache Software License, Version 1.1)
 *
 * 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 acknowledgment:
 *       "This product includes software developed by
 *        Jive Software (http://www.jivesoftware.com)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Smack" and "Jive Software" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please
 *    contact webmaster@jivesoftware.com.
 *
 * 5. Products derived from this software may not be called "Smack",
 *    nor may "Smack" appear in their name, without prior written
 *    permission of Jive Software.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL JIVE SOFTWARE OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 */

package org.jivesoftware.smack;

import org.jivesoftware.smack.packet.XMPPError;

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

/**
 * A generic exception that is thrown when an error occurs performing an
 * XMPP operation. XMPP servers can respond to error conditions with an error code
 * and textual description of the problem, which are encapsulated in the XMPPError
 * class. When appropriate, an XMPPError instance is attached instances of this exception.
 *
 * @see XMPPError
 * @author Matt Tucker
 */
public class XMPPException extends Exception {

    private XMPPError error = null;
    private Throwable wrappedThrowable = null;

    /**
     * Creates a new XMPPException.
     */
    public XMPPException() {
        super();
    }

    /**
     * Creates a new XMPPException with a description of the exception.
     *
     * @param message description of the exception.
     */
    public XMPPException(String message) {
        super(message);
    }

    /**
     * Creates a new XMPPException with the Throwable that was the root cause of the
     * exception.
     *
     * @param wrappedThrowable the root cause of the exception.
     */
    public XMPPException(Throwable wrappedThrowable) {
        super();
        this.wrappedThrowable = wrappedThrowable;
    }

    /**
     * Cretaes a new XMPPException with the XMPPError that was the root case of the
     * exception.
     *
     * @param error the root cause of the exception.
     */
    public XMPPException(XMPPError error) {
        super();
        this.error = error;
    }

    /**
     * Creates a new XMPPException with a description of the exception and the
     * Throwable that was the root cause of the exception.
     *
     * @param message a description of the exception.
     * @param wrappedThrowable the root cause of the exception.
     */
    public XMPPException(String message, Throwable wrappedThrowable) {
        super(message);
        this.wrappedThrowable = wrappedThrowable;
    }

    /**
     * Creates a new XMPPException with a description of the exception, an XMPPError,
     * and the Throwable that was the root cause of the exception.
     *
     * @param message a description of the exception.
     * @param error the root cause of the exception.
     * @param wrappedThrowable the root cause of the exception.
     */
    public XMPPException(String message, XMPPError error, Throwable wrappedThrowable) {
        super(message);
        this.error = error;
        this.wrappedThrowable = wrappedThrowable;
    }

    /**
     * Creates a new XMPPException with a description of the exception and the
     * XMPPException that was the root cause of the exception.
     *
     * @param message a description of the exception.
     * @param error the root cause of the exception.
     */
    public XMPPException(String message, XMPPError error) {
        super(message);
        this.error = error;
    }

    /**
     * Returns the XMPPError asscociated with this exception, or <tt>null</tt> if there
     * isn't one.
     *
     * @return the XMPPError asscociated with this exception.
     */
    public XMPPError getXMPPError() {
        return error;
    }

    /**
     * Returns the Throwable asscociated with this exception, or <tt>null</tt> if there
     * isn't one.
     *
     * @return the Throwable asscociated with this exception.
     */
    public Throwable getWrappedThrowable() {
        return wrappedThrowable;
    }

    public void printStackTrace() {
        printStackTrace(System.err);
    }

    public void printStackTrace(PrintStream out) {
        super.printStackTrace(out);
        if (wrappedThrowable != null) {
            out.println("Nested Exception: ");
            wrappedThrowable.printStackTrace(out);
        }
    }

    public void printStackTrace(PrintWriter out) {
        super.printStackTrace(out);
        if (wrappedThrowable != null) {
            out.println("Nested Exception: ");
            wrappedThrowable.printStackTrace(out);
        }
    }

    public String getMessage() {
        String msg = super.getMessage();
        // If the message was not set, but there is an XMPPError, return the
        // XMPPError as the message.
        if (msg == null && error != null) {
            return error.toString();
        }
        return msg;
    }

    public String toString() {
        StringBuffer buf = new StringBuffer();
        String message = super.getMessage();
        if (message != null) {
            buf.append(message).append(": ");
        }
        if (error != null) {
            buf.append(error);
        }
        if (wrappedThrowable != null) {
            buf.append("\n  -- caused by: ").append(wrappedThrowable);
        }

        return buf.toString();
    }
}