1 /*
2 * Copyright (C) 2016 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 import java.util.Collection;
21 import java.util.Map;
22
23 /**
24 * A dummy superclass to support GWT serialization of the element types of a {@link HashMultimap}.
25 * The GWT supersource for this class contains a field for each type.
26 *
27 * <p>For details about this hack, see {@code GwtSerializationDependencies}, which takes the same
28 * approach but with a subclass rather than a superclass.
29 *
30 * <p>TODO(cpovirk): Consider applying this subclass approach to our other types.
31 */
32 @GwtCompatible(emulated = true)
33 abstract class HashMultimapGwtSerializationDependencies<K, V> extends AbstractSetMultimap<K, V> {
34 HashMultimapGwtSerializationDependencies(Map<K, Collection<V>> map) {
35 super(map);
36 }
37 }