/*
* This file is part of JGAP.
*
* JGAP offers a dual license model containing the LGPL as well as the MPL.
*
* For licensing 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 org.jgap;
import org.jgap.util.*;
/**
* An implementation of a fitness evaluator interpreting the fitness as delta
* value.
*
* @author Klaus Meffert
* @since 2.0
*/
public class DeltaFitnessEvaluator
implements FitnessEvaluator, ICloneable, Comparable {
/** String containing the CVS revision. Read out via reflection!*/
private final static String CVS_REVISION = "$Revision: 1.11 $";
/**
* Compares the first given fitness value with the second and returns true
* if the first one is smaller than the second one. Otherwise returns false
* @param a_fitness_value1 first fitness value
* @param a_fitness_value2 second fitness value
* @return true: first fitness value smaller than second
*
* @since 2.0 (until 1.1: input types int)
*/
public boolean isFitter(final double a_fitness_value1,
final double a_fitness_value2) {
if (Double.isNaN(a_fitness_value1)) {
return false;
}
else if (!Double.isNaN(a_fitness_value1) &&
!Double.isNaN(a_fitness_value2)) {
if (a_fitness_value1 < 0) {
return false;
}
if (a_fitness_value2 < 0) {
return true;
}
return a_fitness_value1 < a_fitness_value2;
}
return true;
}
public boolean isFitter(IChromosome a_chrom1, IChromosome a_chrom2) {
return isFitter(a_chrom1.getFitnessValue(), a_chrom2.getFitnessValue());
}
/**
* @return deep clone of this instance
*
* @author Klaus Meffert
* @since 3.2
*/
public Object clone() {
return new DeltaFitnessEvaluator();
}
/**
* @param a_other sic
* @return as always
*
* @author Klaus Meffert
* @since 3.2
*/
public int compareTo(Object a_other) {
if (a_other.getClass().equals(getClass())) {
return 0;
}
else {
return getClass().getName().compareTo(a_other.getClass().getName());
}
}
}