/*  PAT: Persistent Applications Toolkit (patsystem.sf.net)
 *  Copyright (C) 2004, 2005  Tomasz Nazar, nthx at irc dot pl
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 *  This library 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
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  Full version of the license is /docs/LICENSE.txt
 */
package org.nthx.util.jbossaop;

import org.apache.log4j.Logger;
import org.jboss.aop.joinpoint.ConstructorInvocation;
import org.jboss.aop.joinpoint.Invocation;
import org.jboss.aop.joinpoint.MethodInvocation;

/** Just for logging execution of interceptors.
 *
 *  @version $Id: InterceptorLogger.java 3725 2005-06-09 23:57:03Z nthx $
 *  @author nthx@users.sourceforge.net
 */
public class InterceptorLogger
       extends DefaultInterceptorImpl
{
    private transient static Logger log = Logger.getLogger("pat");

    public Object invoke(Invocation invocation) throws Throwable
    {
        log.debug("------>>>: " + getInvocationName(invocation) + " for :" + getInfo(invocation));
        Object result = invocation.invokeNext();
        log.debug("  **<<--|: " + getInvocationName(invocation));
        return result;
    }


    //-----------------------------------------------------------
    private Invocation getBaseInvocation(Invocation invocation)
    {
        return (Invocation) ((MethodInvocation)invocation).getArguments()[0];
    }

    private String getInvocationName(Invocation invocation)
    {
        return getBaseInvocation(invocation).toString().substring(
                getBaseInvocation(invocation).toString().lastIndexOf(".") + 1);
    }

    private String getInfo(Invocation invocation)
    {
        String info;
        Invocation baseInvocation = getBaseInvocation(invocation);
        if (baseInvocation instanceof MethodInvocation)
        {
            info = ((MethodInvocation) baseInvocation).getMethod().toString();
        }
        else if (baseInvocation instanceof ConstructorInvocation)
            info = ((ConstructorInvocation)baseInvocation).getConstructor().getName();
        else
            info = "unknown, TODO";
        return info;
    }

}