ProgramRulesApplicatorPolicyHandler.java

package net.bmahe.genetics4j.gp.mutation;

import java.util.List;
import java.util.Objects;

import org.apache.commons.lang3.Validate;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import net.bmahe.genetics4j.core.mutation.MutationPolicyHandler;
import net.bmahe.genetics4j.core.mutation.MutationPolicyHandlerResolver;
import net.bmahe.genetics4j.core.mutation.Mutator;
import net.bmahe.genetics4j.core.spec.AbstractEAConfiguration;
import net.bmahe.genetics4j.core.spec.AbstractEAExecutionContext;
import net.bmahe.genetics4j.core.spec.mutation.MutationPolicy;
import net.bmahe.genetics4j.gp.spec.mutation.ProgramApplyRules;
import net.bmahe.genetics4j.gp.spec.mutation.Rule;

public class ProgramRulesApplicatorPolicyHandler<T extends Comparable<T>> implements MutationPolicyHandler<T> {
	public static final Logger logger = LogManager.getLogger(ProgramRulesApplicatorPolicyHandler.class);

	@Override
	public boolean canHandle(final MutationPolicyHandlerResolver<T> mutationPolicyHandlerResolver,
			final MutationPolicy mutationPolicy) {
		Objects.requireNonNull(mutationPolicyHandlerResolver);
		Objects.requireNonNull(mutationPolicy);

		return mutationPolicy instanceof ProgramApplyRules;
	}

	@Override
	public Mutator createMutator(final AbstractEAExecutionContext<T> eaExecutionContext,
			final AbstractEAConfiguration<T> eaConfiguration,
			final MutationPolicyHandlerResolver<T> mutationPolicyHandlerResolver, final MutationPolicy mutationPolicy) {
		Objects.requireNonNull(eaExecutionContext);
		Objects.requireNonNull(eaConfiguration);
		Objects.requireNonNull(mutationPolicyHandlerResolver);
		Objects.requireNonNull(mutationPolicy);
		Validate.isInstanceOf(ProgramApplyRules.class, mutationPolicy);

		final ProgramApplyRules programApplyRules = (ProgramApplyRules) mutationPolicy;
		final List<Rule> rules = programApplyRules.rules();

		return new ProgramRulesApplicatorMutator(rules, eaConfiguration);
	}
}