MaximizingFunctionFitnessFunction


1   /*
2    * This file is part of JGAP.
3    *
4    * JGAP offers a dual license model containing the LGPL as well as the MPL.
5    *
6    * For licencing information please see the file license.txt included with JGAP
7    * or have a look at the top of class org.jgap.Chromosome which representatively
8    * includes the JGAP license policy applicable for any file delivered with JGAP.
9    */
10  package examples.config;
11  
12  import org.jgap.*;
13  
14  /**
15   * Sample Fitness function for the MaximizingFunction problem.
16   */
17  public class MaximizingFunctionFitnessFunction
18      extends FitnessFunction {
19    /** String containing the CVS revision. Read out via reflection!*/
20    private final static String   CVS_REVISION = "$Revision: 1.4 $";
21  
22    /**
23     * Determine the fitness of the given Chromosome instance. The higher the
24     * return value, the more fit the instance. This method should always
25     * return the same fitness value for two equivalent Chromosome instances.
26     * @author Siddhartha Azad.
27     * @param a_chromosome the Chromosome instance to evaluate
28     * @return a positive integer reflecting the fitness rating of the given
29     * Chromosome
30     */
31    public double evaluate(IChromosome a_chromosome) {
32      int numGenes = a_chromosome.size();
33      if (numGenes != 3) {
34        throw new IllegalArgumentException  ("Chromosome for " +
35                                           "MaximizingFunction must have "
36                                           + "exactly 3 genes.");
37      }
38      Integer   aVal = (Integer  ) a_chromosome.getGene(0).getAllele();
39      Integer   bVal = (Integer  ) a_chromosome.getGene(1).getAllele();
40      Integer   cVal = (Integer  ) a_chromosome.getGene(2).getAllele();
41      return (aVal.intValue() - bVal.intValue() + cVal.intValue());
42    }
43  }
44
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