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 java.util.List;
20import java.util.Map;
21import java.util.Set;
22
23/**
24 * Creates map entries using sample keys and sample values.
25 *
26 * <p>This class is GWT compatible.
27 *
28 * @author Jesse Wilson
29 */
30public abstract class TestMapEntrySetGenerator<K, V>
31    implements TestSetGenerator<Map.Entry<K, V>> {
32  private final SampleElements<K> keys;
33  private final SampleElements<V> values;
34
35  protected TestMapEntrySetGenerator(
36      SampleElements<K> keys, SampleElements<V> values) {
37    this.keys = keys;
38    this.values = values;
39  }
40
41  @Override
42  public SampleElements<Map.Entry<K, V>> samples() {
43    return SampleElements.mapEntries(keys, values);
44  }
45
46  @Override
47  public Set<Map.Entry<K, V>> create(Object... elements) {
48    Map.Entry<K, V>[] entries = createArray(elements.length);
49    Platform.unsafeArrayCopy(elements, 0, entries, 0, elements.length);
50    return createFromEntries(entries);
51  }
52
53  public abstract Set<Map.Entry<K, V>> createFromEntries(
54      Map.Entry<K, V>[] entries);
55
56  @Override
57  @SuppressWarnings("unchecked") // generic arrays make typesafety sad
58  public Map.Entry<K, V>[] createArray(int length) {
59    return new Map.Entry[length];
60  }
61
62  /** Returns the original element list, unchanged. */
63  @Override
64  public List<Map.Entry<K, V>> order(List<Map.Entry<K, V>> insertionOrder) {
65    return insertionOrder;
66  }
67}
68