Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
EdgeComparator |
|
| 1.0;1 |
1 | /* | |
2 | * Licensed to the Apache Software Foundation (ASF) under one | |
3 | * or more contributor license agreements. See the NOTICE file | |
4 | * distributed with this work for additional information | |
5 | * regarding copyright ownership. The ASF licenses this file | |
6 | * to you under the Apache License, Version 2.0 (the | |
7 | * "License"); you may not use this file except in compliance | |
8 | * with the License. You may obtain a copy of the License at | |
9 | * | |
10 | * http://www.apache.org/licenses/LICENSE-2.0 | |
11 | * | |
12 | * Unless required by applicable law or agreed to in writing, software | |
13 | * distributed under the License is distributed on an "AS IS" BASIS, | |
14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
15 | * See the License for the specific language governing permissions and | |
16 | * limitations under the License. | |
17 | */ | |
18 | ||
19 | package org.apache.giraph.utils; | |
20 | ||
21 | import com.google.common.collect.ComparisonChain; | |
22 | import org.apache.giraph.edge.Edge; | |
23 | import org.apache.hadoop.io.WritableComparable; | |
24 | ||
25 | import java.io.Serializable; | |
26 | import java.util.Comparator; | |
27 | ||
28 | /** | |
29 | * Comparator for edges. | |
30 | * | |
31 | * @param <I> Vertex id | |
32 | * @param <E> Edge value (needs to be WritableComparable) | |
33 | */ | |
34 | 0 | public class EdgeComparator<I extends WritableComparable, |
35 | E extends WritableComparable> implements Comparator<Edge<I, E>>, | |
36 | Serializable { | |
37 | /** Serialization version. */ | |
38 | private static final long serialVersionUID = 1L; | |
39 | ||
40 | @Override | |
41 | public int compare(Edge<I, E> e1, Edge<I, E> e2) { | |
42 | 0 | return compareEdges(e1, e2); |
43 | } | |
44 | ||
45 | /** | |
46 | * Compares two edges. | |
47 | * | |
48 | * @param e1 First edge | |
49 | * @param e2 Second edge | |
50 | * @param <I> Vertex id | |
51 | * @param <E> Edge value (needs to be WritableComparable) | |
52 | * @return A negative, zero, or positive value depending | |
53 | */ | |
54 | public static <I extends WritableComparable, E extends WritableComparable> | |
55 | int compareEdges(Edge<I, E> e1, Edge<I, E> e2) { | |
56 | 0 | return ComparisonChain.start() |
57 | 0 | .compare(e1.getTargetVertexId(), e2.getTargetVertexId()) |
58 | 0 | .compare(e1.getValue(), e2.getValue()) |
59 | 0 | .result(); |
60 | } | |
61 | ||
62 | /** | |
63 | * Indicates whether two edges are equal. | |
64 | * | |
65 | * @param e1 First edge | |
66 | * @param e2 Second edge | |
67 | * @param <I> Vertex id | |
68 | * @param <E> Edge value (needs to be WritableComparable) | |
69 | * @return Whether the two edges are equal | |
70 | */ | |
71 | public static <I extends WritableComparable, E extends WritableComparable> | |
72 | boolean equal(Edge<I, E> e1, Edge<I, E> e2) { | |
73 | 0 | return compareEdges(e1, e2) == 0; |
74 | } | |
75 | } |