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/***
 * OW2 FraSCAti Tinfi
 * Copyright (C) 2008-2018 Inria, Univ. Lille
 *
 * 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
 *
 * Contact: [email protected]
 *
 * Author: Lionel Seinturier
 * Contributor: Philippe Merle
 */

package org.ow2.frascati.tinfi;

import java.lang.reflect.AccessibleObject;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.List;

import org.objectweb.fractal.api.Component;
import org.objectweb.fractal.api.Interface;
import org.ow2.frascati.tinfi.api.IntentHandler;
import org.ow2.frascati.tinfi.api.IntentJoinPoint;

/**
 * Implementation of the {@link IntentJoinPoint} interface for introspecting
 * intent join points. An intent join point corresponds to the interface where a
 * service or reference invocation has been intercepted.

 * @author Lionel Seinturier 
 * @author Philippe Merle 
 * @since 0.3
 */
public class IntentJoinPointImpl implements IntentJoinPoint {

    protected List handlers;
    protected int index = 0;

    protected Component intentComponent;
    protected Interface intentItf;
    protected T intentTarget;
    private Method intentMethod;
    protected Object[] intentMethodArguments;
    
    /**
     * Initialize this intent join point.
     */
    public void init(
        List handlers,
        Component intentComponent,
        Interface intentItf,
        T intentTarget,
        Method intentMethod,
        Object... intentMethodArguments ) {
        
        this.handlers = handlers;
        this.intentComponent = intentComponent;
        this.intentItf = intentItf;
        this.intentTarget = intentTarget;
        this.intentMethod = intentMethod;
        this.intentMethodArguments = intentMethodArguments;
    }
    
    public Component getComponent() {
        return intentComponent;
    }

    public Interface getInterface() {
        return intentItf;
    }
    
    public Object[] getArguments() {
        return intentMethodArguments;
    }

    public Method getMethod() {
        return intentMethod;
    }
    
    public AccessibleObject getStaticPart() {
        return intentMethod;
    }
    
    public T getThis() {
        return intentTarget;
    }

    public Object proceed() throws Throwable {
        
        if( index == handlers.size() ) {
            
            try {
                Object ret =
                    intentMethod.invoke(intentTarget,intentMethodArguments);
                return ret;                
            }
            catch( InvocationTargetException ite ) {
                // Throw the exception thrown by the invoked method
                Throwable t = ite.getTargetException();
                throw t;
            }
            
            /*
             * The following commented lines of code correspond to a feature
             * which has been removed in version 1.3.
             * 
             * See SCAIntentInterceptorSourceCodeGenerator#generateFields() for
             * further information.
             */
//            String msg = "Unexpected case: index==handlers.length should have been checked by the subclass";
//            throw new TinfiRuntimeException(msg);
        }
        
        IntentHandler handler = handlers.get(index);
        index++;
        Object ret = handler.invoke(this);
        return ret;
    }
}