Package weka.core.packageManagement

Class PackageConstraint

java.lang.Object

weka.core.packageManagement.PackageConstraint

Direct Known Subclasses:

VersionPackageConstraint, VersionRangePackageConstraint

public abstract class PackageConstraint
extends java.lang.Object

Abstract base class for package constraints. An example implementation might be to encapsulate a constraint with respect to a version number. Checking against a target in this case would typically assume the same package for both this and the target.

Version:

$Revision: 44030 $

Author:

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

Constructor Summary

Constructors

Constructor	Description
PackageConstraint()

Method Summary

Modifier and Type	Method	Description
abstract boolean	checkConstraint(Package target)	Check the target package against the constraint embodied in this PackageConstraint.
abstract PackageConstraint	checkConstraint(PackageConstraint target)	Check the target package constraint against the constraint embodied in this package constraint.
Package	getPackage()	Get the package that this constraint applies to.
void	setPackage(Package p)	Set the package that this constraint applies to.

Methods inherited from class java.lang.Object

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

Constructor Detail

PackageConstraint

public PackageConstraint()

Method Detail

setPackage

public void setPackage(Package p)

Set the package that this constraint applies to.

Parameters:

p - the package that this constraint applies to.

getPackage

public Package getPackage()

Get the package that this constraint applies to.

Returns:

the Package that this constraint applies to.

checkConstraint

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

Check the target package against the constraint embodied in this 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.

checkConstraint

public abstract 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.

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