org.apache.archiva.common.utils

Class VersionComparator

java.lang.Object

org.apache.archiva.common.utils.VersionComparator

All Implemented Interfaces:

Comparator<String>

public class VersionComparator
extends Object
implements Comparator<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.

Field Summary

Fields

Modifier and Type	Field and Description
private static Comparator<String>	INSTANCE
private List<String>	specialWords

Constructor Summary

Constructors

Constructor and Description
VersionComparator()

Method Summary

Modifier and Type	Method and Description
int	compare(String o1, String o2)
private int	comparePart(String s1, String s2)
static Comparator<String>	getInstance()
private String	safePart(String[] parts, int idx)
static String[]	toParts(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

comparing, comparing, comparingDouble, comparingInt, comparingLong, equals, naturalOrder, nullsFirst, nullsLast, reversed, reverseOrder, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Field Detail

INSTANCE

private static final Comparator<String> INSTANCE

specialWords

private final List<String> specialWords

Constructor Detail

VersionComparator

public VersionComparator()

Method Detail

getInstance

public static Comparator<String> getInstance()

compare

public int compare(String o1,
                   String o2)

Specified by:

compare in interface Comparator<String>

safePart

private String safePart(String[] parts,
                        int idx)

comparePart

private int comparePart(String s1,
                        String s2)

toParts

public static String[] toParts(String version)