//
// SwitchRMI  Framework
// Copyright (c) 2000-2002 by Michael J. Henderson & Associates.
//
// Michael Henderson
// http://switchrmi.sf.net
// mailto:mikehenderson@dunelm.org.uk
//
// This library is free software.
//
// You may redistribute it and/or modify it under the terms of the GNU
// Lesser General Public License as published by the Free Software Foundation.
//
// Version 2.1 of the license should be included with this distribution in
// the file LICENSE, as well as License.html. If the license is not
// included with this distribution, you may find a copy at the FSF web
// site at 'www.gnu.org' or 'www.fsf.org', or you may write to the
// Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139 USA.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied waranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//
// $Id: RmiInvocationHandlerBase.java,v 1.1 2002/11/11 22:19:48 mikehenderson Exp $
package com.mjh.switchrmi;

import java.lang.reflect.*;

import java.util.*;

import org.apache.log4j.*;

public abstract class RmiInvocationHandlerBase
    implements InvocationHandler
{
    private static final Logger log = 
            Logger.getLogger(RmiInvocationHandlerBase.class.getName());
    private static HashMap illegalMethods = new HashMap();

    static
    {
        illegalMethods.put("toString", "x");
        illegalMethods.put("wait", "x");
        illegalMethods.put("clone", "x");
        illegalMethods.put("getClass", "x");
        illegalMethods.put("notify", "x");
        illegalMethods.put("hashCode", "x");
        illegalMethods.put("finalize", "x");
        illegalMethods.put("equals", "x");
    }

    private Class[] interfaces;

    public RmiInvocationHandlerBase(Class[] interfaces)
    {
        this.interfaces = interfaces;
    }

    /**
     * @see java.lang.reflect.InvocationHandler#invoke(Object, Method, Object[])
     */
    public Object invoke(Object target, Method method, Object[] args)
                  throws Throwable
    {
        Object result = null;

        if ((illegalMethods.get(method.getName()) != null)
            || !methodIsInInterfaces(method))
        {
            return method.invoke(this, args);
        }

        return rmiInvoke(target, method, args);
    }

    public abstract Object rmiInvoke(Object target, Method method, 
                                     Object[] args)
        throws Throwable;

    private boolean methodIsInInterfaces(Method method)
    {
        boolean result = false;
        Class declaringClass = method.getDeclaringClass();

        for (int i = 0; i < interfaces.length; i++)
        {
            Class interfaze = interfaces[i];

            result = interfaze.getName().equals(declaringClass.getName());

            if (result == true)
            {
                break;
            }
        }

        return result;
    }
}