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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;

import java.io.Serializable;

/**
 * Factory class that generates a {@link PolicyValue} object for an actual value.
 * @author Greg Meyer
 * @since 1.0
 */
public class PolicyValueFactory
{
	/**
	 * Creates an instance of a {@link PolicyValue} object containing the given value.
	 * @param value The value that is contained within the generated {@link PolicyValue} object.
	 * @return New instance of a {@link PolicyValue} object containing the given value.
	 */
	public static  PolicyValue getInstance(T value)
	{
		return new PolicyValueImpl(value);
	}
	
	/**
	 * Default {@link PolicyValue} interface implementation.
	 * @author Greg Meyer
	 *
	 * @param  The type of policy value contained within the class.
	 */
	protected static class PolicyValueImpl implements PolicyValue, Serializable
	{
		static final long serialVersionUID = -7760457667066558146L;

		
		protected final T value;

		/**
		 * Constructor
		 * @param value The value contained within the {@link PolicyValue} object.
		 */
		protected PolicyValueImpl(T value)
		{
			this.value = value;
		}
		
		/**
		 * {@inheritDoc}
		 */
		@Override
		public T getPolicyValue()
		{
			return value;
		}
		
		/**
		 * Returns the toString representation of the internal policy value.
		 */
		@Override
		public String toString()
		{
			return value.toString();
		}
		
		/**
		 * {@inheritDoc}
		 */
		@Override 
		public boolean equals(Object obj)
		{
			if (obj == null)
				return false;
			
			if (obj instanceof PolicyValue)
				return value.equals(((PolicyValue)obj).getPolicyValue());
			
			return value.equals(obj);
		}
		
		///CLOVER:OFF
		/**
		 * {@inheritDoc}
		 */
		@Override
		public int hashCode()
		{
			return value.hashCode();
		}
		///CLOVER:ON
		
	}
}