weka.core.packageManagement

Class VersionPackageConstraint

java.lang.Object

weka.core.packageManagement.PackageConstraint

weka.core.packageManagement.VersionPackageConstraint

public class VersionPackageConstraint
extends PackageConstraint

Concrete implementation of PackageConstraint that encapsulates constraints related to version numbers. Handles equality = and open-ended inequalities (e.g. > x, < x, >= x, <= x).

Version:

$Revision: 51469 $

Author:

mhall (mhall{[at]}pentaho{[dot]}com)

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	VersionPackageConstraint.VersionComparison Enumeration encapsulating version comparison operations

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	VERSION_KEY The meta data key for the version number

Constructor Summary

Constructors

Constructor and Description
VersionPackageConstraint(Package p)

Method Summary

Modifier and Type	Method and Description
boolean	checkConstraint(Package target) Check the target package against the constraint embodied in this PackageConstraint.
PackageConstraint	checkConstraint(PackageConstraint target) Check the target package constraint against the constraint embodied in this package constraint.
static VersionPackageConstraint.VersionComparison	compare(java.lang.String version1, java.lang.String version2) Returns a VersionComparison that represents the comparison between the supplied version 1 and version 2.
VersionPackageConstraint.VersionComparison	getVersionComparison()
void	setVersionConstraint(java.lang.String constraint)
void	setVersionConstraint(VersionPackageConstraint.VersionComparison c)
java.lang.String	toString()

Methods inherited from class weka.core.packageManagement.PackageConstraint

getPackage, setPackage

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

VERSION_KEY

public static java.lang.String VERSION_KEY

The meta data key for the version number

Constructor Detail

VersionPackageConstraint

public VersionPackageConstraint(Package p)

Method Detail

compare

public static VersionPackageConstraint.VersionComparison compare(java.lang.String version1,
                                                                 java.lang.String version2)

Returns a VersionComparison that represents the comparison between the supplied version 1 and version 2.

Parameters:

version1 - String containing version number 1.

version2 - String containing version number 2.

Returns:

a VersionComparison object.

setVersionConstraint

public void setVersionConstraint(VersionPackageConstraint.VersionComparison c)

getVersionComparison

public VersionPackageConstraint.VersionComparison getVersionComparison()

setVersionConstraint

public void setVersionConstraint(java.lang.String constraint)

checkConstraint

public PackageConstraint checkConstraint(PackageConstraint target)
                                  throws java.lang.Exception

Check the target package constraint against the constraint embodied in this package constraint. Returns either the package constraint that covers both this and the target constraint, or null if this and the target are incompatible. Try and return the *least* restrictive constraint that satisfies this and the target.

Specified by:

checkConstraint in class PackageConstraint

Parameters:

target - the package constraint to compare against

Returns:

a package constraint that covers this and the supplied constraint, or null if they are incompatible.

Throws:

java.lang.Exception

checkConstraint

public boolean checkConstraint(Package target)
                        throws java.lang.Exception

Check the target package against the constraint embodied in this PackageConstraint.

Specified by:

checkConstraint in class PackageConstraint

Parameters:

target - a package to check with respect to the encapsulated package and the constraint.

Returns:

true if the constraint is met by the target package with respect to the encapsulated package + constraint.

Throws:

java.lang.Exception - if the constraint can't be checked for some reason.

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object