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); 
    } 
 
 
}