nntpexception.java

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/***********************************************************************
 * Copyright (c) 2000-2004 The Apache Software Foundation.             *
 * All rights reserved.                                                *
 * ------------------------------------------------------------------- *
 * 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.apache.james.nntpserver;

/**
 * Exception Wrapper, like javax.servlet.ServletException.
 * Purpose is to catch and wrap exceptions into unchecked NNTP specific. 
 * Protocol handler catches the exception and returns error info to client.
 * Error Information is obtained by calling 'getMessage'
 *
 */
public class NNTPException extends RuntimeException {

    /**
     * The encapsulated Throwable
     */
    private final Throwable t;

    /**
     * Create an NNTPException with an error message and no
     * encapsulated <code>Throwable</code>
     *
     * @param msg the error message for this exception
     */
    public NNTPException(String msg) {
        super(msg);
        this.t = null;
    }

    /**
     * Create an NNTPException with an error message and an
     * encapsulated <code>Throwable</code>
     *
     * @param msg the error message for this exception
     * @param t the encapsulated <code>Throwable</code>
     */
    public NNTPException(String msg,Throwable t) {
        super(msg+((t!=null)?": "+t.toString():""));
        this.t = t;
    }

    /**
     * Create an NNTPException with an
     * encapsulated <code>Throwable</code>
     *
     * @param t the encapsulated <code>Throwable</code>
     */
    public NNTPException(Throwable t) {
        super(t.toString());
        this.t = t;
    }
}