/*
 * Copyright 2014 (C) Tom Parker <thpr@users.sourceforge.net>
 * 
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 * 
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package pcgen.cdom.content;

import pcgen.base.calculation.AbstractNEPCalculation;
import pcgen.base.calculation.BasicCalculation;
import pcgen.base.formula.base.EvaluationManager;
import pcgen.base.util.FormatManager;
	
/**
 * A ProcessCalculation is an AbstractNEPCalculation that uses a simple object
 * for the calculation (such as adding a specific Integer).
 * 
 * @param <T>
 *            The format of object on which this ProcessCalculation operates
 */
public final class ProcessCalculation<T> extends AbstractNEPCalculation<T>
{
	/**
	 * The underlying object to be passed in to the BasicCalculation of this
	 * ProcessCalculation when it is processed.
	 */
	private final T obj;
	
	/**
	 * The FormatManager to manage objects that this ProcessCalculation operates
	 * upon.
	 */
	private final FormatManager<T> formatManager;

	/**
	 * Constructs a new ProcessCalculation from the given object and
	 * BasicCalculation.
	 * 
	 * @param object
	 *            The underlying object to be passed into the given
	 *            BasicCalculation when this ProcessCalculation is processed
	 * @param calc
	 *            The BasicCalculation which defines the operation to be
	 *            performed when this this ProcessCalculation is processed
	 */
	public ProcessCalculation(T object, BasicCalculation<T> calc,
		FormatManager<T> fmtManager)
	{
		super(calc);
		this.obj = object;
		this.formatManager = fmtManager;
	}

	@Override
	public T process(EvaluationManager evalManager)
	{
		@SuppressWarnings("unchecked")
		T input = evalManager == null ? null : (T) evalManager.get(EvaluationManager.INPUT);
		return getBasicCalculation().process(input, obj);
	}

	@Override
	public String getInstructions()
	{
		return formatManager.unconvert(obj);
	}

	@Override
	public int hashCode()
	{
		return obj.hashCode() ^ getBasicCalculation().hashCode();
	}

	@Override
	public boolean equals(Object o)
	{
		if (o instanceof ProcessCalculation)
		{
			ProcessCalculation<?> other = (ProcessCalculation<?>) o;
			return other.getBasicCalculation().equals(getBasicCalculation())
				&& other.obj.equals(obj);
		}
		return false;
	}
}