org.japtproxy.packages
Class AbstractRepoPackageVersionComparator

java.lang.Object
  org.japtproxy.packages.AbstractRepoPackageVersionComparator

All Implemented Interfaces:

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

Direct Known Subclasses:

DebianPackageVersionComparator, RpmPackageVersionComparator

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

The VersionComparator is responsible for comparing package versions. This is required for sorting a list of packages from the same program with different versions.

The algorithm used in this class was borrowed from vercmp.c in libdpkg which is written by Ian Jackson.

Version:

$LastChangedRevision: 116 $

Author:

Oliver J. Siegmar

Field Summary

protected static org.slf4j.Logger	LOG The logger instance.
protected static int	NON_ASCII_OFFSET Non ASCII offset constant.

Constructor Summary

AbstractRepoPackageVersionComparator()

Method Summary

int	compare(java.lang.String f1, java.lang.String f2) Compares two packages based on the version and revision field.
protected abstract int	order(char[] ca, int pos) Returns the order for a single character.
void	setRepoPackageFactory(IRepoPackageFactory repoPackageFactory)
protected int	strCompare(java.lang.String s1, java.lang.String s2) Compares two version strings and returns and int that specifies the order.

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

Field Detail

LOG

protected static final org.slf4j.Logger LOG

The logger instance.

NON_ASCII_OFFSET

protected static final int NON_ASCII_OFFSET

Non ASCII offset constant.

See Also:

Constant Field Values

Constructor Detail

AbstractRepoPackageVersionComparator

public AbstractRepoPackageVersionComparator()

Method Detail

setRepoPackageFactory

public void setRepoPackageFactory(IRepoPackageFactory repoPackageFactory)

order

protected abstract int order(char[] ca,
                             int pos)

Returns the order for a single character.

Parameters:

ca - the character array

pos - the position in the character array

Returns:

the order for the given character

strCompare

protected int strCompare(java.lang.String s1,
                         java.lang.String s2)

Compares two version strings and returns and int that specifies the order.

Parameters:

s1 - version string 1

s2 - version string 2

Returns:

the order

compare

public int compare(java.lang.String f1,
                   java.lang.String f2)

Compares two packages based on the version and revision field.

Specified by:

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

Parameters:

f1 - file1

f2 - file2

Returns:

0 if both packages have the same version (should not happen), 1 if f1 is more recent than f2, otherwise -1