001    //$HeadURL: svn+ssh://jwilden@svn.wald.intevation.org/deegree/base/branches/2.5_testing/src/org/deegree/framework/util/Interceptor.java $
002    /*----------------------------------------------------------------------------
003     This file is part of deegree, http://deegree.org/
004     Copyright (C) 2001-2009 by:
005       Department of Geography, University of Bonn
006     and
007       lat/lon GmbH
008    
009     This library is free software; you can redistribute it and/or modify it under
010     the terms of the GNU Lesser General Public License as published by the Free
011     Software Foundation; either version 2.1 of the License, or (at your option)
012     any later version.
013     This library is distributed in the hope that it will be useful, but WITHOUT
014     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
015     FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
016     details.
017     You should have received a copy of the GNU Lesser General Public License
018     along with this library; if not, write to the Free Software Foundation, Inc.,
019     59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
020    
021     Contact information:
022    
023     lat/lon GmbH
024     Aennchenstr. 19, 53177 Bonn
025     Germany
026     http://lat-lon.de/
027    
028     Department of Geography, University of Bonn
029     Prof. Dr. Klaus Greve
030     Postfach 1147, 53001 Bonn
031     Germany
032     http://www.geographie.uni-bonn.de/deegree/
033    
034     e-mail: info@deegree.org
035    ----------------------------------------------------------------------------*/
036    package org.deegree.framework.util;
037    
038    import java.lang.reflect.InvocationTargetException;
039    import java.lang.reflect.Method;
040    
041    import org.deegree.framework.log.ILogger;
042    import org.deegree.framework.log.LoggerFactory;
043    
044    /**
045     * @author <a href="mailto:tfr@users.sourceforge.net">Torsten Friebe </A>
046     *
047     * @author last edited by: $Author: mschneider $
048     *
049     * @version 2.0, $Revision: 18195 $, $Date: 2009-06-18 17:55:39 +0200 (Do, 18 Jun 2009) $
050     *
051     * @see <a href="http://www.dofactory.com/patterns/PatternChain.aspx">Chain of Responsibility Design
052     *      Pattern </a>
053     *
054     * @since 2.0
055     */
056    public abstract class Interceptor {
057    
058        /**
059         * Logging for all Interceptors
060         */
061        protected static final ILogger LOG = LoggerFactory.getLogger( Interceptor.class );
062    
063        /**
064         * Do an invocation of the given method while being able to something else first.
065         * @param method
066         * @param params
067         * @return some object
068         * @throws IllegalAccessException
069         * @throws InvocationTargetException
070         */
071        protected abstract Object handleInvocation( Method method, Object[] params )
072                                throws IllegalAccessException, InvocationTargetException;
073    
074        /**
075         *
076         */
077        protected Interceptor nextInterceptor;
078    
079        /**
080         * @return the target
081         */
082        protected Object getTarget() {
083            return this.nextInterceptor.getTarget();
084        }
085    }