/*******************************************************************************
 *  Copyright (c) 2010 Association for Decentralized Information Management in
 *  Industry THTH ry.
 *  All rights reserved. This program and the accompanying materials
 *  are made available under the terms of the Eclipse Public License v1.0
 *  which accompanies this distribution, and is available at
 *  http://www.eclipse.org/legal/epl-v10.html
 *
 *  Contributors:
 *      VTT Technical Research Centre of Finland - initial API and implementation
 *******************************************************************************/
package org.simantics.databoard.binding.mutable;

import org.simantics.databoard.binding.Binding;
import org.simantics.databoard.binding.OptionalBinding;
import org.simantics.databoard.binding.error.BindingException;
import org.simantics.databoard.type.OptionalType;

/**
 * Binds OptionalType to ValueContainer
 *
 * @author Toni Kalajainen <toni.kalajainen@vtt.fi>
 */
public class ContainerOptionalBinding extends OptionalBinding {

	public ContainerOptionalBinding(Binding componentBinding) {
		super(componentBinding);
	}

	public ContainerOptionalBinding(OptionalType type, Binding componentBinding) {
		super(type, componentBinding);
	}
	
	@Override
	public boolean hasValue(Object arg) {
		return ((ValueContainer)arg).value != null;
	}

	@Override
	public Object getValue(Object arg) {
		return ((ValueContainer)arg).value;
	}
	
	@Override
	public Object createNoValue() {
		return new ValueContainer();
	}
	
	@Override
	public Object createValue(Object value) throws BindingException {
		ValueContainer result = new ValueContainer();
		result.value = value;
		return result;
	}
	
	@Override
	public boolean isInstance(Object obj) {
		return obj instanceof ValueContainer;
	}
	
	@Override
	public void setValue(Object optional, Object componentValue)
	throws BindingException {
		((ValueContainer) optional).value = componentValue;
	}
	
	@Override
	public void setNoValue(Object optional) throws BindingException {
		((ValueContainer) optional).value = null;		
	}
}