org.apache.maven.archiva.common.utils
Class VersionComparator

java.lang.Object
  org.apache.maven.archiva.common.utils.VersionComparator

All Implemented Interfaces:

java.util.Comparator<java.lang.String>

public class VersionComparator
extends java.lang.Object
implements java.util.Comparator<java.lang.String>

VersionComparator - compare the parts of two version strings.

Technique.

* Split the version strings into parts by splitting on "-._" first, then breaking apart words from numbers.

"1.0" = "1", "0" "1.0-alpha-1" = "1", "0", "alpha", "1" "2.0-rc2" = "2", "0", "rc", "2" "1.3-m2" = "1", "3", "m", "3"

compare each part individually, and when they do not match, perform the following test.

Numbers are calculated per normal comparison rules. Words that are part of the "special word list" will be treated as their index within that heirarchy. Words that cannot be identified as special, are treated using normal case-insensitive comparison rules.

Constructor Summary

VersionComparator()

Method Summary

int	compare(java.lang.String o1, java.lang.String o2)
static java.util.Comparator<java.lang.String>	getInstance()
static java.lang.String[]	toParts(java.lang.String version)

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

Constructor Detail

VersionComparator

public VersionComparator()

Method Detail

getInstance

public static java.util.Comparator<java.lang.String> getInstance()

compare

public int compare(java.lang.String o1,
                   java.lang.String o2)

Specified by:

compare in interface java.util.Comparator<java.lang.String>

toParts

public static java.lang.String[] toParts(java.lang.String version)