BulkFitnessFunction


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 org.jgap;
11  
12  import java.io.*;
13  import org.jgap.util.*;
14  
15  /**
16   * Bulk fitness functions are used to determine how optimal a group of
17   * solutions are relative to each other. Bulk fitness functions can be
18   * useful (vs. normal fitness functions) when fitness of a particular
19   * solution cannot be easily computed in isolation, but instead is
20   * dependent upon the fitness of its fellow solutions that are also
21   * under consideration. This abstract class should be extended and the
22   * evaluateChromosomes() method implemented to evaluate each of the
23   * Chromosomes given in an array and set their fitness values prior
24   * to returning.
25   *
26   * @author Neil Rotstan
27   * @author Klaus Meffert
28   * @since 1.0
29   */
30  public abstract class BulkFitnessFunction
31      implements Serializable, ICloneable {
32    /** String containing the CVS revision. Read out via reflection!*/
33    private final static String   CVS_REVISION = "$Revision: 1.8 $";
34  
35    /**
36     * Calculates and sets the fitness values on each of the given
37     * Chromosomes via their setFitnessValue() method.
38     *
39     * @param a_chromosomes list of Chromosomes for which the fitness values
40     * must be computed and set
41     *
42     * @author Neil Rotstan
43     * @author Klaus Meffert
44     * @since 2.2 (prior versions used other input type)
45     */
46    public abstract void evaluate(Population a_chromosomes);
47  
48    /**
49     * Override in your implementation if necessary.
50     *
51     * @return deep clone of the current instance
52     *
53     * @author Klaus Meffert
54     * @since 3.2
55     */
56    public Object   clone() {
57      try {
58        return super.clone();
59      } catch (CloneNotSupportedException   cex) {
60        throw new CloneException(cex);
61      }
62    }
63  }
64
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