jgossipexception.java

来自「jGossip是一个简单而功能强大的Java论坛软件（消息板）」· Java 代码 · 共 161 行

/*
 * $Id: JGossipException.java,v 1.1 2004/05/30 20:03:58 bel70 Exp $
 *
 * ***** BEGIN LICENSE BLOCK *****
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.1 (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.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 * the License for the specific language governing rights and 
 * limitations under the License.
 *
 * The Original Code is JGossip forum code.
 *
 * The Initial Developer of the Original Code is the JResearch, Org. 
 * Portions created by the Initial Developer are Copyright (C) 2004 
 * the Initial Developer. All Rights Reserved. 
 * 
 * Contributor(s): 
 *              Dmitriy Belov <[e-mail]>
 *               .
 * * ***** END LICENSE BLOCK ***** */

package org.jresearch.gossip.exception;

import java.io.*;

/**
* Class <code>JGossipException</code> is a base class
 * for all exceptions in application/
* @author <code>$Author: bel70 $</code>
* @version <code>$Revision: 1.1 $</code>
*/
public class JGossipException extends Exception {

    /** Field <code>nestedException</code> */
    private Exception nestedException;

    /**
     * Constructor <code>JGossipException</code> creates empty exception
     */
    protected JGossipException() {
        super();
        nestedException = null;
    }

    /**
     * Constructor <code>JGossipException</code> creates exception with error message
     * @param <code>msg</code> error message
     */
    protected JGossipException(String msg) {
        super(msg);
        nestedException = null;
    }

    /**
     * Constructor <code>JGossipException</code> create exception with
     * originaly thrown one
     * @param <code>cause</code> original exception
     */
    protected JGossipException(Exception cause) {
        super();
        nestedException = cause;
    }

    /**
     * Constructor <code>JGossipException</code> create exception with
     * error message and original exception
     * @param <code>msg</code> error message
     * @param <code>cause</code> original exception
     */
    protected JGossipException(String msg, Exception cause) {
        super(msg);
        nestedException = cause;
    }

    /**
     * Method <code>getException</code> return original exception
     * @return original exception
     */
    public Exception getNestedException() {
        return nestedException;
    }

    /**
     * Method <code>getMessage</code> return erorr message
     * @return error message
     */
    public String getMessage() {

        String msg = super.getMessage();
        Exception ex = getNestedException();

        if (ex != null) {
            String s = ex.getMessage();

            if (s != null) {
                if (msg == null)
                    msg = "";
                else
                    msg += "\n";
                msg += "CAUSE: " + s;
            }
        }
        return msg;
    }

    /**
     * Method <code>getStackTrace</code> return exception stack trace
     * @return stack trace as String
     */
    public String getTrace() {

        StringWriter strwrt = new StringWriter();

        super.printStackTrace(new PrintWriter(strwrt));
        return strwrt.toString();
    }

    /**
     * Method <code>printStackTrace</code> print stack trace in given stream
     * @param <code>out</code> stream to write trace to
     */
    public void printStackTrace(PrintStream out) {

        Exception ex = getNestedException();

        if (ex != null) {
            ex.printStackTrace(out);
            out.println("WRAPPING EXCEPTION:");
        }
        super.printStackTrace(out);
    }

    /**
     * Method <code>printStackTrace</code> print stack trace in given stream
     * @param <code>out</code> stream to write trace to
     */
    public void printStackTrace(PrintWriter out) {

        Exception ex = getNestedException();

        if (ex != null) {
            ex.printStackTrace(out);
            out.println("WRAPPING EXCEPTION:");
        }
        super.printStackTrace(out);
    }

    /**
     * Method <code>printStackTrace</code> print stack trace to output
     */
    public void printStackTrace() {
        printStackTrace(System.err);
    }
}