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Jenetics - Java Genetic Algorithm Library

There is a newer version: 8.1.0

/*
 * Java Genetic Algorithm Library (jenetics-3.9.0).
 * Copyright (c) 2007-2017 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 ([email protected])
 */
package org.jenetics.engine;

import static java.util.Objects.requireNonNull;

import java.util.Iterator;
import java.util.function.Function;
import java.util.function.Supplier;

import org.jenetics.Gene;

/**
 * @author Franz Wilhelmstötter
 * @since 3.0
 * @version 3.0
 */
final class EvolutionIterator<
	G extends Gene,
	C extends Comparable
>
	implements Iterator>
{

	private final Function, EvolutionResult> _evolution;
	private final Supplier> _initial;

	private EvolutionStart _start;

	EvolutionIterator(
		final Supplier> initial,
		final Function, EvolutionResult> evolution
	) {
		_evolution = requireNonNull(evolution);
		_initial = requireNonNull(initial);
	}

	@Override
	public EvolutionResult next() {
		if (_start == null) {
			_start = _initial.get();
		}

		final EvolutionResult result = _evolution.apply(_start);
		_start = result.next();
		return result;
	}

	@Override
	public boolean hasNext() {
		return true;
	}

}