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

1 /*
2  * Copyright (C) 2007 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.io.Serializable;
23 import java.util.Comparator;
24 import org.checkerframework.checker.nullness.qual.Nullable;
25 
26 /** An ordering for a pre-existing comparator. */
27 @GwtCompatible(serializable = true)
28 final class ComparatorOrdering<T> extends Ordering<T> implements Serializable {
29   final Comparator<T> comparator;
30 
31   ComparatorOrdering(Comparator<T> comparator) {
32     this.comparator = checkNotNull(comparator);
33   }
34 
35   @Override
36   public int compare(T a, T b) {
37     return comparator.compare(a, b);
38   }
39 
40   @Override
41   public boolean equals(@Nullable Object object) {
42     if (object == this) {
43       return true;
44     }
45     if (object instanceof ComparatorOrdering) {
46       ComparatorOrdering<?> that = (ComparatorOrdering<?>) object;
47       return this.comparator.equals(that.comparator);
48     }
49     return false;
50   }
51 
52   @Override
53   public int hashCode() {
54     return comparator.hashCode();
55   }
56 
57   @Override
58   public String toString() {
59     return comparator.toString();
60   }
61 
62   private static final long serialVersionUID = 0;
63 }