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Direct Project policy enablement engine
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/* 
Copyright (c) 2010, NHIN Direct Project
All rights reserved.

Authors:
   Greg Meyer      [email protected]
 
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer 
in the documentation and/or other materials provided with the distribution.  Neither the name of the The NHIN Direct Project (nhindirect.org). 
nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS 
BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 
GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 
THE POSSIBILITY OF SUCH DAMAGE.
*/

package org.nhindirect.policy.impl;

import java.util.Collection;

import org.nhindirect.policy.IntegerPolicyOperatorExecutor;
import org.nhindirect.policy.PolicyOperator;
import org.nhindirect.policy.PolicyValue;
import org.nhindirect.policy.PolicyValueFactory;

/**
 * Executor that evaluates operations that take a single parameter and return an integer value.
 * @author Greg Meyer
 * @since 1.0
 *
 * @param  Object type of the single operand.
 */
public class UnaryIntegerPolicyOperatorExecutor implements IntegerPolicyOperatorExecutor
{
	protected final PolicyValue operand;
	protected final PolicyOperator operator;
	
	/**
	 * Constructor
	 * @param operand  The single operand
	 * @param operator The operation that will be executed.
	 */
	public UnaryIntegerPolicyOperatorExecutor(PolicyValue operand, PolicyOperator operator)
	{
		if (!operator.equals(PolicyOperator.SIZE))
			throw new IllegalArgumentException("Operator " + operator.getOperatorText() + " is not allowed for this executor type.");
		
		this.operand = operand;
		this.operator = operator;
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public PolicyValue execute() 
	{
		int retVal;
		
		switch(operator)
		{
			case SIZE:
			{
				final Collection coll = Collection.class.cast(operand.getPolicyValue());
				
				retVal = coll.size();
				break;
			}
			///CLOVER:OFF
			default: 
				retVal = 0;
			///CLOVER:ON
		}
		return PolicyValueFactory.getInstance(retVal);
	}
}