Package com.avoka.fc.core.util

Class VersionNumberComparator

java.lang.Object

com.avoka.fc.core.util.VersionNumberComparator

All Implemented Interfaces:

Comparator<String>

public class VersionNumberComparator
extends Object
implements Comparator<String>

Provides a comparator for version numbers in the format a.b.c (e.g. 3.6.0). Up to four levels are supported (e.g. 4.0.0.1). If less than 4 levels are used, unused levels are assumed to be 0 (e.g. 1.5 is treated internally as 1.5.0.0)

Since:

4.0.0

Constructor Summary

Constructors

Constructor	Description
VersionNumberComparator()

Method Summary

Modifier and Type	Method	Description
int	compare(String value1, String value2)	Compares two version numbers in the format a.b.c (e.g.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.util.Comparator

equals, reversed, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Constructor Detail

VersionNumberComparator

public VersionNumberComparator()

Method Detail

compare

public int compare(String value1,
                   String value2)

Compares two version numbers in the format a.b.c (e.g. 3.6.0). Up to four levels are supported (e.g. 4.0.0.1). If less than 4 levels are used, unused levels are assumed to be 0 (e.g. 1.5 is treated internally as 1.5.0.0). Null version numbers are treated as being "less than" other version numbers. Note: If version numbers use non-numeric components on the significant levels (e.g. 3.6a), the comparator will fail. You have been warned.

Specified by:

compare in interface Comparator<String>

Parameters:

value1 - the first version number string

value2 - the second version number string

Returns:

-1, 0 or 1 if the first version number is less than, equal to or greater than the second version number