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;
020
021import java.util.ArrayList;
022import java.util.Collections;
023import java.util.List;
024import java.util.Objects;
025
026import de.cuioss.test.generator.internal.net.java.quickcheck.Generator;
027
028public class DuplicateGenerator<T> implements Generator<List<T>> {
029
030    private final List<T> values;
031    private final SubsetGenerator<T> subsets;
032
033    public DuplicateGenerator(Iterable<T> values) {
034        Objects.requireNonNull(values, "values");
035        this.values = mutableList(values);
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}