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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.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;

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

/**
 * Executor that evaluates operations that take two parameters and return collection.
 * @author Greg Meyer
 * @since 1.0
 * 
 * @param  Object type of the first operand.
 * @param  Object type of the second operand.
 */
public class BinaryCollectionPolicyOperatorExecutor implements CollectionPolicyOperatorExecutor
{
	protected final PolicyValue operand1;
	protected final PolicyValue operand2;	
	protected final PolicyOperator operator;
	
	/**
	 * Constructor
	 * @param operand1 The first operand
	 * @param operand2 The second operand
	 * @param operator The operation that will be executed.
	 */
	public BinaryCollectionPolicyOperatorExecutor(PolicyValue operand1, PolicyValue operand2, PolicyOperator operator)
	{
		if (!(operator.equals(PolicyOperator.INTERSECTION)))
			throw new IllegalArgumentException("Operator " + operator.getOperatorText() + " is not allowed for this executor type.");
		
		this.operand1 = operand1;
		this.operand2 = operand2;
		this.operator = operator;
	}
	
	/**
	 * {@inheritDoc}
	 */
	@SuppressWarnings({ "rawtypes", "unchecked" })
	@Override
	public PolicyValue> execute() 
	{
		
		Collection retVal;
		
		switch (operator)
		{
		    case INTERSECTION:
		    {
		    	// if either parameter is a string, then convert it to a collection
		    	// using the "," as a delimter
		    	Collection col1;
		    	if (operand1.getPolicyValue() instanceof String)
		    	{
		    		final String[] items = operand1.getPolicyValue().toString().split(",");
		    		col1 = Arrays.asList(items);
		    	}
		    	else
		    		col1 = Collection.class.cast(operand1.getPolicyValue());
		    		
		    	Collection col2;
		    	if (operand2.getPolicyValue() instanceof String)
		    	{
		    		final String[] items = operand2.getPolicyValue().toString().split(",");
		    		col2 = Arrays.asList(items);
		    	}
		    	else
		    		col2 = Collection.class.cast(operand2.getPolicyValue());
		    	
				final HashSet set1 = new HashSet(col1);
				
				set1.retainAll(col2);
				
				retVal = set1;
				
				break;
		    }
		    ///CLOVER:OFF
			default: 
				retVal = Collections.emptyList();
		    ///COLVER:ON
		}
		
		return PolicyValue.class.cast(PolicyValueFactory.getInstance(retVal));
	}
	
	/**
	 * {@inheritDoc}
	 */
    ///CLOVER:OFF
	@Override
	public String toString()
	{
		final StringBuilder builder = new StringBuilder("Operator: ").append(operator.toString())
		.append("\r\nOperand 1: ").append(operand1)
		.append("\r\nOperand 2: ").append(operand2).append("\r\n");
		
		return builder.toString();
	}
    ///CLOVER:ON
}