/*
 * 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@gmail.com)
 */
package io.jenetics.ext.grammar;

import java.util.concurrent.atomic.AtomicInteger;
import java.util.random.RandomGenerator;
import java.util.stream.IntStream;

import io.jenetics.ext.grammar.Cfg.Rule;

/**
 * @author <a href="mailto:franz.wilhelmstoetter@gmail.com">Franz Wilhelmstötter</a>
 */
public class TrackingCodons implements SymbolIndex {

	private final IntStream.Builder _values;

	private final RandomGenerator _random;
	private final AtomicInteger _pos = new AtomicInteger(0);

	public TrackingCodons(final RandomGenerator random) {
		_random = random;
		_values = IntStream.builder();
	}

	public int[] values() {
		return _values.build().toArray();
	}

	@Override
	public int next(final Rule<?> rule, final int bound) {
		final int value = _random.nextInt(256);
		_values.accept(value);
		return value%bound;
	}

}
