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.Objects;
024
025public class DuplicateGenerator<T> implements Generator<List<T>> {
026
027    private final List<T> values;
028    private final SubsetGenerator<T> subsets;
029
030    public DuplicateGenerator(Iterable<T> values) {
031        Objects.requireNonNull(values, "values");
032        this.values = new ArrayList<>();
033        for (T item : values) {
034            this.values.add(item);
035        }
036        this.subsets = new SubsetGenerator<>(values, new IntegerGenerator(1, this.values.size()));
037    }
038
039    @Override
040    public List<T> next() {
041        List<T> r = new ArrayList<>(values);
042        r.addAll(subsets.next());
043        Collections.shuffle(r);
044        return r;
045    }
046
047}