Coverage Summary for Class: CompoundOrdering (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 com.google.common.annotations.GwtCompatible;
20 import java.io.Serializable;
21 import java.util.Arrays;
22 import java.util.Comparator;
23 
24 /** An ordering that tries several comparators in order. */
25 @GwtCompatible(serializable = true)
26 final class CompoundOrdering<T> extends Ordering<T> implements Serializable {
27   final Comparator<? super T>[] comparators;
28 
29   CompoundOrdering(Comparator<? super T> primary, Comparator<? super T> secondary) {
30     this.comparators = (Comparator<? super T>[]) new Comparator[] {primary, secondary};
31   }
32 
33   CompoundOrdering(Iterable<? extends Comparator<? super T>> comparators) {
34     this.comparators = Iterables.toArray(comparators, new Comparator[0]);
35   }
36 
37   @Override
38   public int compare(T left, T right) {
39     for (int i = 0; i < comparators.length; i++) {
40       int result = comparators[i].compare(left, right);
41       if (result != 0) {
42         return result;
43       }
44     }
45     return 0;
46   }
47 
48   @Override
49   public boolean equals(Object object) {
50     if (object == this) {
51       return true;
52     }
53     if (object instanceof CompoundOrdering) {
54       CompoundOrdering<?> that = (CompoundOrdering<?>) object;
55       return Arrays.equals(this.comparators, that.comparators);
56     }
57     return false;
58   }
59 
60   @Override
61   public int hashCode() {
62     return Arrays.hashCode(comparators);
63   }
64 
65   @Override
66   public String toString() {
67     return "Ordering.compound(" + Arrays.toString(comparators) + ")";
68   }
69 
70   private static final long serialVersionUID = 0;
71 }