/*
 * Copyright (c) 2003,2007 Declarative Engineering LLC.
 * All rights reserved.  This program and the accompanying materials
 * are made available under the terms of the Declarative Engineering LLC
 * verson 1 which accompanies this distribution, and is available at
 * http://declarativeengineering.com/legal/DE_Developer_License_v1.txt
 */
package com.foundation.view;

import com.common.debug.*;

public class MethodAssociation extends ValueHolderAssociation implements IMethodAssociation {
	private int associationNumber = 0;
	private IAssociationHandler handler = null;
	/** The listener for held value changed notifications. */
	private IMethodAssociationChangeListener listener = null;
/**
 * MethodAssociation constructor.
 * @param handler The object that handles the method invocations.
 * @param associationNumber The association number which will be passed to the handler when the assocation is invoked.  This number allows fast indexing of the methods that the handler handles.
 * @param component The component the association is connected to.
 * @param valueHolderName The optional name of the value holder for the association.
 * @param heldType The optional class which is a subclass of the value holder's held type and defines the association.
 * @param rowType The optional class which defines the association if a held type or value holder is not provided, and it determines whether this association is used based on whether it matches the control's row type.
 */
public MethodAssociation(IAssociationHandler handler, int associationNumber, IAbstractComponent component, String valueHolderName, Class heldType, Class rowType) {
	super(component, valueHolderName, heldType, rowType);
	
	this.handler = handler;
	this.associationNumber = associationNumber;
}//MethodAssociation()//
 /* (non-Javadoc)
 * @see com.foundation.tcv.swt.server.IMethodAssociation#invoke(java.lang.Object[], boolean)
 */
public Object invoke(Object[] parameters, boolean synchronous) {
	return invoke(null, parameters, synchronous);
}//invoke()//
/* (non-Javadoc)
 * @see com.foundation.tcv.swt.server.IMethodAssociation#invoke(java.lang.Object, java.lang.Object[], boolean)
 */
public Object invoke(final Object value, final Object[] parameters, boolean synchronous) {
	Object result = null;
	Object object = value != null ? value : getValueHolder().getValue();
	
	try {
		if(object != null) {
			result = handler.invokeMethod(associationNumber, object, parameters);
		}//if//
	}//try//
	catch(Throwable e) {
		Debug.log(e);
	}//catch//
	
	return result;
}//invoke()//
/* (non-Javadoc)
 * @see com.foundation.view.IMethodAssociation#heldValueChanged()
 */
public void heldValueChanged() {
	listener.onEventFired(this);
}//heldValueChanged()//
/* (non-Javadoc)
 * @see com.foundation.view.IMethodAssociation#register()
 */
public void register() {
	if(getIsValueHolderAssociated()) {
		getValueHolder().registerListener(this);
	}//if//
}//register()//
/* (non-Javadoc)
 * @see com.foundation.view.IMethodAssociation#unregister()
 */
public void unregister() {
	if(getIsValueHolderAssociated()) {
		getValueHolder().unregisterListener(this);
	}//if//
}//unregister()//
/* (non-Javadoc)
 * @see com.foundation.view.IMethodAssociation#setChangeListener(com.foundation.view.IMethodAssociationChangeListener)
 */
public void setChangeListener(IMethodAssociationChangeListener listener) {
	this.listener = listener;
}//setChangeListener()//
}//MethodAssociation//