001/*
002 * Copyright © 2025 CUI-OpenSource-Software (info@cuioss.de)
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package de.cuioss.test.generator.internal.net.java.quickcheck.generator.support;
017
018import de.cuioss.test.generator.internal.net.java.quickcheck.Generator;
019
020import java.util.ArrayList;
021import java.util.Collections;
022import java.util.List;
023import java.util.Set;
024
025
026public class FixedValuesGenerator<T> implements Generator<T> {
027
028    private final List<T> values;
029    private final IntegerGenerator index;
030
031    public FixedValuesGenerator() {
032        this(Collections.singleton(null));
033    }
034
035    public FixedValuesGenerator(T value) {
036        this(Set.of(value));
037    }
038
039    public FixedValuesGenerator(Iterable<T> values) {
040        var list = new ArrayList<T>();
041        values.forEach(list::add);
042        if (list.isEmpty()) {
043            throw new IllegalArgumentException("values");
044        }
045
046        this.values = list;
047        this.index = new IntegerGenerator(0, this.values.size() - 1);
048    }
049
050    @Override
051    public T next() {
052        return this.values.get(this.index.nextInt());
053    }
054}