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.CollectionLiterals.mutableList;
020import static de.cuioss.tools.collect.MoreCollections.requireNotEmpty;
021
022import java.util.Collections;
023import java.util.List;
024
025import de.cuioss.test.generator.internal.net.java.quickcheck.Generator;
026
027public class FixedValuesGenerator<T> implements Generator<T> {
028
029    private final List<T> values;
030    private final IntegerGenerator index;
031
032    public FixedValuesGenerator() {
033        this(Collections.singleton(null));
034    }
035
036    public FixedValuesGenerator(T value) {
037        this(Collections.singleton(value));
038    }
039
040    public FixedValuesGenerator(Iterable<T> values) {
041        requireNotEmpty(values, "values");
042
043        this.values = mutableList(values);
044        this.index = new IntegerGenerator(0, this.values.size() - 1);
045    }
046
047    @Override
048    public T next() {
049        return this.values.get(this.index.nextInt());
050    }
051}