/**
* @see
* edu.virginia.cs.geneticalgorithm.fitness.FitnessFactory#createFitness(edu.virginia.cs.geneticalgorithm.gene.Genotype)
*/
@Override
public Fitness createFitness(final Genotype individual) {
final ProxyFitness preFit = _preFit.createFitness(individual);
final Fitness postFit =
preFit.generatesPostFitness()
? preFit.getPostFitness()
: _postFit.createFitness(individual);
final ShortCircuitFitness retval =
new ShortCircuitFitness(preFit, _preThreshold, postFit, _postFitLen);
retval.setPostScale(_postScale);
return retval;
}
/**
* @param preFactory {@link FitnessFactory} that generates {@link Fitness} functions requiring
* less time to run than those generated by postFactory and can often act as a reasonable
* proxy
* @param preThreshold {@link java.util.List List} of threshold values for multi-objective fitness
* which must all be passed for the postFit {@link Fitness} function to be evaluated
* @param postFactory {@link FitnessFactory} that generates {@link Fitness} function to run if
* threshold is met
* @param postFitLen Number of fitness values returned by the postFit {@link Fitness} function
*/
public ShortCircuitFitnessFactory(
final ProxyFitnessFactory preFactory,
final List<Double> preThreshold,
final FitnessFactory postFactory,
final int postFitLen) {
_preFit = preFactory;
_preThreshold = preThreshold;
_postFit = postFactory;
_postFitLen = postFitLen;
if (postFactory == null && !preFactory.generatesPostFitness())
throw new IllegalArgumentException(
"If the proxy fitness factory cannot generate a post "
+ "fitness function, one must be provided!");
}
@Override
public void ready() {
_preFit.ready();
if (_postFit != null) _postFit.ready();
}
