MultiCombinationsHandler.java
package net.bmahe.genetics4j.core.combination.multicombinations;
import java.util.List;
import java.util.random.RandomGenerator;
import java.util.stream.Collectors;
import org.apache.commons.lang3.Validate;
import net.bmahe.genetics4j.core.combination.ChromosomeCombinator;
import net.bmahe.genetics4j.core.combination.ChromosomeCombinatorHandler;
import net.bmahe.genetics4j.core.combination.ChromosomeCombinatorResolver;
import net.bmahe.genetics4j.core.spec.chromosome.ChromosomeSpec;
import net.bmahe.genetics4j.core.spec.combination.CombinationPolicy;
import net.bmahe.genetics4j.core.spec.combination.MultiCombinations;
public class MultiCombinationsHandler<T extends Comparable<T>> implements ChromosomeCombinatorHandler<T> {
private final RandomGenerator randomGenerator;
public MultiCombinationsHandler(final RandomGenerator _randomGenerator) {
Validate.notNull(_randomGenerator);
this.randomGenerator = _randomGenerator;
}
@Override
public boolean canHandle(final ChromosomeCombinatorResolver<T> chromosomeCombinatorResolver,
final CombinationPolicy combinationPolicy, final ChromosomeSpec chromosome) {
Validate.notNull(chromosomeCombinatorResolver);
Validate.notNull(combinationPolicy);
Validate.notNull(chromosome);
final boolean isMultiCombinationPolicy = combinationPolicy instanceof MultiCombinations;
if (isMultiCombinationPolicy == false) {
return false;
}
final MultiCombinations multiCombinations = (MultiCombinations) combinationPolicy;
return multiCombinations.combinationPolicies()
.stream()
.allMatch((cp) -> chromosomeCombinatorResolver.canHandle(cp, chromosome));
}
@Override
public ChromosomeCombinator<T> resolve(final ChromosomeCombinatorResolver<T> chromosomeCombinatorResolver,
final CombinationPolicy combinationPolicy, final ChromosomeSpec chromosome) {
Validate.notNull(chromosomeCombinatorResolver);
Validate.notNull(combinationPolicy);
Validate.notNull(chromosome);
Validate.isInstanceOf(MultiCombinations.class, combinationPolicy);
final MultiCombinations multiCombinations = (MultiCombinations) combinationPolicy;
final List<ChromosomeCombinator<T>> chromosomeCombinators = multiCombinations.combinationPolicies()
.stream()
.map((cp) -> {
return chromosomeCombinatorResolver.resolve(cp, chromosome);
})
.collect(Collectors.toList());
return new MultiChromosomeCombinations<T>(randomGenerator, chromosomeCombinators);
}
}