Coverage Summary for Class: SingletonImmutableTable (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 static com.google.common.base.Preconditions.checkNotNull;
20 
21 import com.google.common.annotations.GwtCompatible;
22 import java.util.Map;
23 
24 /**
25  * An implementation of {@link ImmutableTable} that holds a single cell.
26  *
27  * @author Gregory Kick
28  */
29 @GwtCompatible
30 class SingletonImmutableTable<R, C, V> extends ImmutableTable<R, C, V> {
31   final R singleRowKey;
32   final C singleColumnKey;
33   final V singleValue;
34 
35   SingletonImmutableTable(R rowKey, C columnKey, V value) {
36     this.singleRowKey = checkNotNull(rowKey);
37     this.singleColumnKey = checkNotNull(columnKey);
38     this.singleValue = checkNotNull(value);
39   }
40 
41   SingletonImmutableTable(Cell<R, C, V> cell) {
42     this(cell.getRowKey(), cell.getColumnKey(), cell.getValue());
43   }
44 
45   @Override
46   public ImmutableMap<R, V> column(C columnKey) {
47     checkNotNull(columnKey);
48     return containsColumn(columnKey)
49         ? ImmutableMap.of(singleRowKey, singleValue)
50         : ImmutableMap.<R, V>of();
51   }
52 
53   @Override
54   public ImmutableMap<C, Map<R, V>> columnMap() {
55     return ImmutableMap.of(singleColumnKey, (Map<R, V>) ImmutableMap.of(singleRowKey, singleValue));
56   }
57 
58   @Override
59   public ImmutableMap<R, Map<C, V>> rowMap() {
60     return ImmutableMap.of(singleRowKey, (Map<C, V>) ImmutableMap.of(singleColumnKey, singleValue));
61   }
62 
63   @Override
64   public int size() {
65     return 1;
66   }
67 
68   @Override
69   ImmutableSet<Cell<R, C, V>> createCellSet() {
70     return ImmutableSet.of(cellOf(singleRowKey, singleColumnKey, singleValue));
71   }
72 
73   @Override
74   ImmutableCollection<V> createValues() {
75     return ImmutableSet.of(singleValue);
76   }
77 
78   @Override
79   SerializedForm createSerializedForm() {
80     return SerializedForm.create(this, new int[] {0}, new int[] {0});
81   }
82 }