/* Copyright 2009-2016 David Hadka
 *
 * This file is part of the MOEA Framework.
 *
 * The MOEA Framework 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 3 of the License, or (at your
 * option) any later version.
 *
 * The MOEA Framework 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 the MOEA Framework.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.moeaframework.analysis.collector;

import org.moeaframework.core.Variation;
import org.moeaframework.core.operator.AdaptiveMultimethodVariation;
import org.moeaframework.core.operator.CompoundVariation;

/**
 * Collects the individual operator probabilities from 
 * {@link AdaptiveMultimethodVariation}.
 */
public class AdaptiveMultimethodVariationCollector implements Collector {

	/**
	 * The adaptive multimethod variation instance used by this collector; or
	 * {@code null} if this collector has not yet been attached.
	 */
	private final AdaptiveMultimethodVariation variation;

	/**
	 * Constructs an unattached collector for recording the individual operator
	 * probabilities from {@code AdaptiveMultimethodVariation}.
	 */
	public AdaptiveMultimethodVariationCollector() {
		this(null);
	}
	
	/**
	 * Constructs a collector for recording the individual operator
	 * probabilities from the specified {@code AdaptiveMultimethodVariation}.
	 * 
	 * @param variation the {@code AdaptiveMultimethodVariation} instance this
	 *        collector records data from
	 */
	public AdaptiveMultimethodVariationCollector(
			AdaptiveMultimethodVariation variation) {
		super();
		this.variation = variation;
	}

	@Override
	public void collect(Accumulator accumulator) {
		for (int i = 0; i < variation.getNumberOfOperators(); i++) {
			Variation operator = variation.getOperator(i);
			
			if (operator instanceof CompoundVariation) {
				accumulator.add(((CompoundVariation)operator).getName(), 
						variation.getOperatorProbability(i));
			} else {
				accumulator.add(operator.getClass().getSimpleName(), 
						variation.getOperatorProbability(i));
			}
		}
	}

	@Override
	public AttachPoint getAttachPoint() {
		return AttachPoint.isSubclass(AdaptiveMultimethodVariation.class);
	}

	@Override
	public Collector attach(Object object) {
		return new AdaptiveMultimethodVariationCollector(
				(AdaptiveMultimethodVariation)object);
	}

}