1   /*
2    * Copyright (C) 2012 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.Collection;
22  import java.util.SortedMap;
23  import java.util.SortedSet;
24  
25  /**
26   * Basic implementation of a {@link SortedSetMultimap} with a sorted key set.
27   * 
28   * This superclass allows {@code TreeMultimap} to override methods to return
29   * navigable set and map types in non-GWT only, while GWT code will inherit the
30   * SortedMap/SortedSet overrides.
31   * 
32   * @author Louis Wasserman
33   */
34  @GwtCompatible
35  abstract class AbstractSortedKeySortedSetMultimap<K, V> extends AbstractSortedSetMultimap<K, V> {
36  
37    AbstractSortedKeySortedSetMultimap(SortedMap<K, Collection<V>> map) {
38      super(map);
39    }
40  
41    @Override
42    public SortedMap<K, Collection<V>> asMap() {
43      return (SortedMap<K, Collection<V>>) super.asMap();
44    }
45  
46    @Override
47    SortedMap<K, Collection<V>> backingMap() {
48      return (SortedMap<K, Collection<V>>) super.backingMap();
49    }
50  
51    @Override
52    public SortedSet<K> keySet() {
53      return (SortedSet<K>) super.keySet();
54    }
55  
56  }