/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.wicket.extensions.model;

import org.apache.wicket.model.IModel;

/**
 * Model adapter that makes working with models for checkboxes easier.
 * 
 * @author Igor Vaynberg (ivaynberg)
 * 
 */
public abstract class AbstractCheckBoxModel implements IModel<Boolean>
{
	private static final long serialVersionUID = 1L;

	/**
	 * @return true to indicate the checkbox should be selected, false otherwise
	 */
	public abstract boolean isSelected();

	/**
	 * Called when checkbox has been selected
	 * 
	 */
	public abstract void select();

	/**
	 * Called when checkbox is unselected
	 * 
	 */
	public abstract void unselect();

	/**
	 * 
	 * @see org.apache.wicket.model.IModel#getObject()
	 */
        @Override
	public final Boolean getObject()
	{
		return isSelected();
	}

	/**
	 * @see org.apache.wicket.model.IModel#setObject(Object)
	 */
        @Override
	public final void setObject(final Boolean object)
	{
		if (Boolean.TRUE.equals(object))
		{
			select();
		}
		else
		{
			unselect();
		}
	}
}