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A set of optimizers for Opt4J
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 * Copyright (c) 2014 Opt4J
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
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package org.opt4j.optimizers.ea;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Random;

import org.opt4j.core.Individual;
import org.opt4j.core.common.random.Rand;
import org.opt4j.operators.crossover.Pair;

import com.google.inject.Inject;

/**
 * The {@link CouplerRandom} uses the set of parents and creates couples
 * randomly from this set. In particular, there is no handling for duplicated
 * {@link Individual}s in the parents list or in one couple.
 * 
 * @author glass
 * 
 */
public class CouplerRandom implements Coupler {

	protected final Random random;

	/**
	 * Constructs a {@link CouplerRandom} with a given {@link Rand} random
	 * number generator.
	 * 
	 * @param random
	 *            the random number generator
	 */
	@Inject
	public CouplerRandom(Rand random) {
		this.random = random;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.opt4j.operator.mating.Coupler#getCouples(int, java.util.List)
	 */
	@Override
	public Collection> getCouples(int size, List parents) {
		Collection> couples = new ArrayList>();
		for (int i = 0; i < size; i++) {

			Individual first = parents.get(random.nextInt(parents.size()));
			Individual second = parents.get(random.nextInt(parents.size()));
			Pair pair = new Pair(first, second);
			couples.add(pair);
		}
		return couples;
	}

}