supergenechangefitnessfunction.java

JGAP（发音"jay-gap"）是一款用Java编写的遗传算法包。提供了基本的遗传算法.你可以使用它来解决一些适用于遗传算法解决的问题.

/*
 * This file is part of JGAP.
 *
 * JGAP offers a dual license model containing the LGPL as well as the MPL.
 *
 * For licencing information please see the file license.txt included with JGAP
 * or have a look at the top of class org.jgap.Chromosome which representatively
 * includes the JGAP license policy applicable for any file delivered with JGAP.
 */
package examples.supergene;

import org.jgap.*;
import org.jgap.supergenes.*;

/**
 *
 * Fitness function for a version where Supergene is used.
 *
 * @author Neil Rotstan
 * @author Klaus Meffert
 * @author Audrius Meskauskas (subsequent adaptation)
 * @since 2.0
 */
public class SupergeneChangeFitnessFunction
    extends AbstractChangeFitnessFunction {
  /** String containing the CVS revision. Read out via reflection!*/
  private final static String CVS_REVISION = "$Revision: 1.1 $";

  public SupergeneChangeFitnessFunction(int a_targetAmount) {
    super(a_targetAmount);
  }

  /**
   * Dimes and nickels are taken from the chromosome, and
   * quarters and pennies are taken from the supergene (gene number 2).
   */
  public Gene getResponsibleGene(IChromosome a_chromosome, int a_code) {
    switch (a_code) {
      case SupergeneSample.DIMES:
      case SupergeneSample.QUARTERS:
        return a_chromosome.getGene(a_code);
      case SupergeneSample.NICKELS:
        Supergene s = (Supergene) a_chromosome.getGene(2);
        return s.geneAt(0);
      case SupergeneSample.PENNIES:
        s = (Supergene) a_chromosome.getGene(2);
        return s.geneAt(1);
      default:
        throw new Error("Invalid coind code " + a_code);
    }
  }
}