/*
 * Copyright 2009 Andrew Pietsch 
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you 
 * may not use this file except in compliance with the License. You may 
 * obtain a copy of the License at 
 *      
 *      http://www.apache.org/licenses/LICENSE-2.0 
 *
 * Unless required by applicable law or agreed to in writing, software 
 * distributed under the License is distributed on an "AS IS" BASIS, 
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or 
 * implied. See the License for the specific language governing permissions 
 * and limitations under the License. 
 */

package com.dragome.forms.bindings.client.binding;

import com.dragome.forms.bindings.client.value.GuardedValueChangeHandler;
import com.dragome.forms.bindings.client.value.MutableValueModel;
import com.dragome.model.interfaces.ValueChangeEvent;

/**
 * Created by IntelliJ IDEA.
 * User: andrew
 * Date: Jul 1, 2009
 * Time: 4:35:13 PM
 * To change this template use File | Settings | File Templates.
 */
public class MutableValueModelToMutableValueModelBinding<T> extends AbstractMutableValueBinding<T>
{
	private MutableValueModel<T> target;
	private TargetMonitor targetValueChangeMonitor= new TargetMonitor();

	public MutableValueModelToMutableValueModelBinding(MutableValueModel<T> source, MutableValueModel<T> target)
	{
		super(source);
		this.target= target;
		registerDisposable(target.addValueChangeHandler(targetValueChangeMonitor));
	}

	protected void updateTarget(final T value)
	{
		targetValueChangeMonitor.whileIgnoringEvents(new Runnable()
		{
			public void run()
			{
				target.setValue(value);
			}
		});
	}

	public MutableValueModel<T> getTarget()
	{
		return target;
	}

	private class TargetMonitor extends GuardedValueChangeHandler<T>
	{
		@Override
		public void onGuardedValueChanged(ValueChangeEvent<T> event)
		{
			updateModel(event.getValue());
		}
	}
}