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
17 package com.google.common.collect;
18
19 import com.google.common.annotations.GwtCompatible;
20
21 import java.util.Map.Entry;
22
23 import javax.annotation.Nullable;
24
25 /**
26 * {@code entrySet()} implementation for {@link ImmutableMap}.
27 *
28 * @author Jesse Wilson
29 * @author Kevin Bourrillion
30 */
31 @GwtCompatible(emulated = true)
32 abstract class ImmutableMapEntrySet<K, V> extends ImmutableSet<Entry<K, V>> {
33 ImmutableMapEntrySet() {}
34
35 abstract ImmutableMap<K, V> map();
36
37 @Override
38 public int size() {
39 return map().size();
40 }
41
42 @Override
43 public boolean contains(@Nullable Object object) {
44 if (object instanceof Entry) {
45 Entry<?, ?> entry = (Entry<?, ?>) object;
46 V value = map().get(entry.getKey());
47 return value != null && value.equals(entry.getValue());
48 }
49 return false;
50 }
51
52 @Override
53 boolean isPartialView() {
54 return map().isPartialView();
55 }
56 }
57