1/*
2 * Copyright (C) 2008 The Guava Authors
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.google.common.collect.testing;
18
19import com.google.common.annotations.GwtCompatible;
20
21import java.util.List;
22import java.util.Map;
23import java.util.Set;
24
25/**
26 * Creates map entries using sample keys and sample values.
27 *
28 * @author Jesse Wilson
29 */
30@GwtCompatible
31public abstract class TestMapEntrySetGenerator<K, V>
32    implements TestSetGenerator<Map.Entry<K, V>> {
33  private final SampleElements<K> keys;
34  private final SampleElements<V> values;
35
36  protected TestMapEntrySetGenerator(
37      SampleElements<K> keys, SampleElements<V> values) {
38    this.keys = keys;
39    this.values = values;
40  }
41
42  @Override
43  public SampleElements<Map.Entry<K, V>> samples() {
44    return SampleElements.mapEntries(keys, values);
45  }
46
47  @Override
48  public Set<Map.Entry<K, V>> create(Object... elements) {
49    Map.Entry<K, V>[] entries = createArray(elements.length);
50    System.arraycopy(elements, 0, entries, 0, elements.length);
51    return createFromEntries(entries);
52  }
53
54  public abstract Set<Map.Entry<K, V>> createFromEntries(
55      Map.Entry<K, V>[] entries);
56
57  @Override
58  @SuppressWarnings("unchecked") // generic arrays make typesafety sad
59  public Map.Entry<K, V>[] createArray(int length) {
60    return new Map.Entry[length];
61  }
62
63  /** Returns the original element list, unchanged. */
64  @Override
65  public List<Map.Entry<K, V>> order(List<Map.Entry<K, V>> insertionOrder) {
66    return insertionOrder;
67  }
68}
69