filterparseexception.java

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//
// This file is part of the OpenNMS(R) Application.
//
// OpenNMS(R) is Copyright (C) 2002-2003 The OpenNMS Group, Inc.  All rights reserved.
// OpenNMS(R) is a derivative work, containing both original code, included code and modified
// code that was published under the GNU General Public License. Copyrights for modified 
// and included code are below.
//
// OpenNMS(R) is a registered trademark of The OpenNMS Group, Inc.
//
// Copyright (C) 1999-2001 Oculan Corp.  All rights reserved.
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program 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 for more details.                                                            
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//       
// For more information contact: 
//      OpenNMS Licensing       <[e-mail]>
//      http://www.opennms.org/
//      http://www.opennms.com/
//

package org.opennms.netmgt.filter;

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

/**
 * This class is used to indicate a failure of the Filter engine to correctly
 * parse a filter expression. If the error was caused by an undeclared exception
 * during processing, that exception is also encapsulated by the exception.
 * 
 * @author <a href="[e-mail]">Jason </a>
 * @author <a href="[e-mail]">Weave </a>
 * 
 */
public class FilterParseException extends RuntimeException {
    /**
     * The encapsulated throwable if any
     */
    private Throwable m_delegate;

    /**
     * Constructs a new, empty filter parser exception.
     */
    public FilterParseException() {
        super();
        m_delegate = null;
    }

    /**
     * Constructs a new parse exception with the passed message as its error
     * text.
     * 
     * @param msg
     *            The exception text.
     * 
     */
    public FilterParseException(String msg) {
        super(msg);
        m_delegate = null;
    }

    /**
     * Constructs a new parse exception with the passed message as the error
     * text and the throwable as the encapsulated error causing the failure.
     * 
     * @param msg
     *            The exception text.
     * @param t
     *            The cause of the failure.
     * 
     */
    public FilterParseException(String msg, Throwable t) {
        super(msg);
        m_delegate = t;
    }

    /**
     * Prints the stack trace of the exception, and the encapsulated exception
     * if any.
     */
    public void printStackTrace() {
        if (m_delegate != null)
            m_delegate.printStackTrace();
        super.printStackTrace();
    }

    /**
     * Prints the stack trace of the exception, and the encapsulated exception
     * if any.
     * 
     * @param ps
     *            The location to write the exception.
     */
    public void printStackTrace(PrintStream ps) {
        if (m_delegate != null)
            m_delegate.printStackTrace(ps);
        super.printStackTrace(ps);
    }

    /**
     * Prints the stack trace of the exception, and the encapsulated exception
     * if any.
     * 
     * @param pw
     *            The location to write the exception.
     */
    public void printStackTrace(PrintWriter pw) {
        if (m_delegate != null)
            m_delegate.printStackTrace(pw);
        super.printStackTrace(pw);
    }
}