package ac.essex.ecj.terminals;

import ec.EvolutionState;
import ac.essex.ecj.util.ERCAdapter;

/**
 * <p/>
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version,
 * provided that any use properly credits the author.
 * This program 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 General Public License for more details at http://www.gnu.org
 * </p>
 *
 * @author Olly Oechsle, University of Essex, Date: 17-Aug-2006
 * @version 1.0
 */
public class OffsetERC extends ERCAdapter {

    public String name() {
        return "OffsetERC";
    }

    /**
     * Chooses a random number that is either: -1, 0, or +1
     */
    public double setNumber(final EvolutionState state, final int thread) {
        return state.random[thread].nextInt(2) - 1;
    }

    public void mutateERC(EvolutionState state, int thread) {
        value = setNumber(state, thread);
    }


}