/*
 * Copyright (c) 1997, 2010, 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();
    }
}
