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// Copyright 2016 Yahoo Inc. 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 ?
Long.valueOf(message1.getTime()).compareTo(Long.valueOf(message2.getTime()))
: Long.valueOf(message2.getTime()).compareTo(Long.valueOf(message1.getTime()));
}
}
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