AbstractAlterer.java

/*
 * Java Genetic Algorithm Library (@__identifier__@).
 * Copyright (c) @__year__@ Franz Wilhelmstötter
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Author:
 *    Franz Wilhelmstötter (franz.wilhelmstoetter@gmx.at)
 */
package org.jenetics;

import static org.jenetics.internal.util.object.checkProbability;
import static org.jenetics.internal.util.object.eq;

import org.jenetics.internal.util.HashBuilder;

/**
 * Abstract implementation of the alterer interface.
 *
 * @author <a href="mailto:franz.wilhelmstoetter@gmx.at">Franz Wilhelmstötter</a>
 * @since 1.0
 * @version 1.0 &mdash; <em>$Date: 2014-03-01 $</em>
 */
public abstract class AbstractAlterer<G extends Gene<?, G>>
	implements Alterer<G>
{

	/**
	 * Return an alterer which does nothing.
	 *
	 * @return an alterer which does nothing.
	 */
	public static <G extends Gene<?, G>> Alterer<G> Null() {
		return new Alterer<G>() {
			@Override
			public <C extends Comparable<? super C>> int alter(
				final Population<G, C> population,
				final int generation
			) {
				return 0;
			}

			@Override
			public int hashCode() {
				return HashBuilder.of(getClass()).value();
			}

			@Override
			public boolean equals(final Object obj) {
				return obj == this ||
						obj != null && obj.getClass() == getClass();
			}

			@Override
			public String toString() {
				return "Alterer.Null";
			}
		};
	}

	public static final double DEFAULT_ALTER_PROBABILITY = 0.2;

	/**
	 * The altering probability.
	 */
	protected final double _probability;

	/**
	 * Constructs an alterer with a given recombination probability.
	 *
	 * @param probability The recombination probability.
	 * @throws IllegalArgumentException if the {@code probability} is not in the
	 *         valid range of {@code [0, 1]}.
	 */
	protected AbstractAlterer(final double probability) {
		_probability = checkProbability(probability);
	}

	/**
	 * Return the recombination/alter probability for this alterer.
	 *
	 * @return The recombination probability.
	 */
	public double getProbability() {
		return _probability;
	}

	@Override
	public int hashCode() {
		return HashBuilder.of(getClass()).and(_probability).value();
	}

	@Override
	public boolean equals(final Object obj) {
		if (obj == this) {
			return true;
		}
		if (!(obj instanceof AbstractAlterer<?>)) {
			return false;
		}

		final AbstractAlterer<?> alterer = (AbstractAlterer<?>)obj;
		return eq(_probability, alterer._probability);
	}
}