/*
 * Copyright (c) 2005, 2006, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
/*
 * @(#)MessagingException.java        1.10 02/06/13
 */



package com.sun.xml.internal.messaging.saaj.packaging.mime;


/**
 * The base class for all exceptions thrown by the Messaging classes
 *
 * @author John Mani
 * @author Bill Shannon
 */

public class MessagingException extends Exception {

    /**
     * The next exception in the chain.
     *
     * @serial
     */
    private Exception next;

    /**
     * Constructs a MessagingException with no detail message.
     */
    public MessagingException() {
	super();
    }

    /**
     * Constructs a MessagingException with the specified detail message.
     * @param s		the detail message
     */
    public MessagingException(String s) {
	super(s);
    }

    /**
     * Constructs a MessagingException with the specified 
     * Exception and detail message. The specified exception is chained
     * to this exception.
     * @param s		the detail message
     * @param e		the embedded exception
     * @see	#getNextException
     * @see	#setNextException
     */
    public MessagingException(String s, Exception e) {
	super(s);
	next = e;
    }

    /**
     * Get the next exception chained to this one. If the
     * next exception is a MessagingException, the chain
     * may extend further.
     *
     * @return	next Exception, null if none.
     */
    public Exception getNextException() {
	return next;
    }

    /**
     * Add an exception to the end of the chain. If the end
     * is <strong>not</strong> a MessagingException, this 
     * exception cannot be added to the end.
     *
     * @param	ex	the new end of the Exception chain
     * @return		<code>true</code> if the this Exception
     *			was added, <code>false</code> otherwise.
     */
    public synchronized boolean setNextException(Exception ex) {
	Exception theEnd = this;
	while (theEnd instanceof MessagingException &&
	       ((MessagingException)theEnd).next != null) {
	    theEnd = ((MessagingException)theEnd).next;
	}
	// If the end is a MessagingException, we can add this 
	// exception to the chain.
	if (theEnd instanceof MessagingException) {
	    ((MessagingException)theEnd).next = ex;
	    return true;
	} else
	    return false;
    }

    /**
     * Produce the message, include the message from the nested
     * exception if there is one.
     */
    public String getMessage() {
	if (next == null)
	    return super.getMessage();
	Exception n = next;
	String s = super.getMessage();
	StringBuffer sb = new StringBuffer(s == null ? "" : s);
	while (n != null) {
	    sb.append(";\n  nested exception is:\n\t");
	    if (n instanceof MessagingException) {
		MessagingException mex = (MessagingException)n;
		sb.append(n.getClass().toString());
		String msg = mex.getSuperMessage();
		if (msg != null) {
		    sb.append(": ");
		    sb.append(msg);
		}
		n = mex.next;
	    } else {
		sb.append(n.toString());
		n = null;
	    }
	}
	return sb.toString();
    }

    private String getSuperMessage() {
	return super.getMessage();
    }
}