Coverage Summary for Class: EmptyImmutableSetMultimap (com.google.common.collect)

1 /*
2  * Copyright (C) 2009 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 /**
22  * Implementation of {@link ImmutableListMultimap} with no entries.
23  *
24  * @author Mike Ward
25  */
26 @GwtCompatible(serializable = true)
27 class EmptyImmutableSetMultimap extends ImmutableSetMultimap<Object, Object> {
28   static final EmptyImmutableSetMultimap INSTANCE = new EmptyImmutableSetMultimap();
29 
30   private EmptyImmutableSetMultimap() {
31     super(ImmutableMap.<Object, ImmutableSet<Object>>of(), 0, null);
32   }
33 
34   private Object readResolve() {
35     return INSTANCE; // preserve singleton property
36   }
37 
38   private static final long serialVersionUID = 0;
39 }