blob: 469f808546f7bec4421d83f7ccf441daac3e74a5 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
|
// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.log;
import java.io.Serializable;
import java.util.Comparator;
/**
* Order LogMessage instances based on timestamp. The default ordering is ascending.
* This may be reversed by the constructor argument.
*
* Note: this comparator imposes orderings that are inconsistent with equals.
* This is due to only looking at the timestamp, so two different messages with
* the same timestamp would appear "equal" to this comparator.
*
* @author vlarsen
*
*/
public class LogMessageTimeComparator implements Comparator<LogMessage>, Serializable {
private static final long serialVersionUID = 1L;
/** Indicate the ordering of the timecomparison */
private boolean ascending = true;
/**
* Create a Time comparator for logmessages. Order is ascending.
*
*/
public LogMessageTimeComparator() {}
/**
* Create a Time comparator for logmessages. The chronological order is dependent
* on the argument to the constructor.
*
* @param ascending true if you want LogMessages ordered ascending according to timestamp.
*/
public LogMessageTimeComparator(boolean ascending) {
this.ascending = ascending;
}
public int compare(LogMessage message1, LogMessage message2) {
return ascending ?
message1.getTimestamp().compareTo(message2.getTimestamp())
: message2.getTimestamp().compareTo(message1.getTimestamp());
}
}
|