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 java.util.HashMap;
020import java.util.Map;
021import java.util.Map.Entry;
022import java.util.Objects;
023import java.util.Set;
024
025import de.cuioss.test.generator.internal.net.java.quickcheck.Generator;
026
027public class SubmapGenerator<K, V> implements Generator<Map<K, V>> {
028
029    private final SubsetGenerator<Entry<K, V>> subsets;
030
031    public SubmapGenerator(Map<K, V> supermap) {
032        Objects.requireNonNull(supermap, "supermap");
033        this.subsets = new SubsetGenerator<>(supermap.entrySet());
034    }
035
036    public SubmapGenerator(Map<K, V> supermap, Generator<Integer> sizes) {
037        Objects.requireNonNull(supermap, "supermap");
038        Objects.requireNonNull(sizes, "sizes");
039        this.subsets = new SubsetGenerator<>(supermap.entrySet(), sizes);
040    }
041
042    @Override
043    public Map<K, V> next() {
044        Set<Entry<K, V>> entries = subsets.next();
045        Map<K, V> submap = new HashMap<>(entries.size());
046        for (Entry<K, V> e : entries)
047            submap.put(e.getKey(), e.getValue());
048        return submap;
049    }
050}