001/*
002 * Licensed to the author under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package de.cuioss.test.generator.internal.net.java.quickcheck.generator.support;
018
019import static de.cuioss.tools.collect.MoreCollections.requireNotEmpty;
020
021import java.util.List;
022
023import de.cuioss.test.generator.internal.net.java.quickcheck.Generator;
024
025public class RoundRobinGenerator<T> implements Generator<T> {
026
027    private final List<Generator<T>> generators;
028    private int index;
029
030    public RoundRobinGenerator(List<Generator<T>> generators) {
031        requireNotEmpty(generators, "generators");
032        this.generators = generators;
033        index = 0;
034    }
035
036    @Override
037    public T next() {
038        Generator<T> generator = generators.get(index++ % generators.size());
039        return generator.next();
040    }
041}