issrg.pba.rbac
Class DefaultValidityPeriodBehaviour

java.lang.Object
  issrg.pba.rbac.SubsetCredentials
      issrg.pba.rbac.DefaultValidityPeriodBehaviour

All Implemented Interfaces:

Credentials, ValidityPeriod, java.lang.Cloneable

Direct Known Subclasses:

AbsoluteValidityPeriod, IntersectionValidityPeriod, RelativeValidityPeriod

public abstract class DefaultValidityPeriodBehaviour
extends SubsetCredentials
implements ValidityPeriod

This class implements the default behaviour of the ValidityPeriod when computing intersections of two periods.

Constructor Summary

protected

DefaultValidityPeriodBehaviour()

Method Summary

boolean	contains(Credentials c) This method checks if this ValidityPeriod contains the given Credentials.
Credentials	intersection(Credentials c) This method computes an intersection of this ValidityPeriod with the given Credentials.

Methods inherited from class issrg.pba.rbac.SubsetCredentials

clone, equals, union

Methods inherited from class java.lang.Object

finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface issrg.pba.rbac.ValidityPeriod

getNotAfter, getNotBefore

Methods inherited from interface issrg.pba.Credentials

clone, union

Constructor Detail

DefaultValidityPeriodBehaviour

protected DefaultValidityPeriodBehaviour()

Method Detail

contains

public boolean contains(Credentials c)

This method checks if this ValidityPeriod contains the given Credentials. It makes sense to pass only ValidityPeriod to this method, but it can handle other Credentials, too. Bascially, it checks that the notBefore of the given ValidityPeriod is not earlier than notBefore of this ValidityPeriod, and that notAfter is not later than notAfter of this ValidityPeriod. If the given Credentials is not a ValidityPeriod, the contains method of the superclass is called.

Specified by:

contains in interface Credentials

Overrides:

contains in class SubsetCredentials

Parameters:

c - - the Credentials object that must be contained in this ValidityPeriod

Returns:

true, if the given Credentials is a ValidityPeriod and is fully contained in this ValidityPeriod; if it is not a ValidityPeriod, the behaviour is defined by the superclass (calls the contains method of the superclass); otherwise it is false.

See Also:

SetOfSubsetsCredentials

intersection

public Credentials intersection(Credentials c)

This method computes an intersection of this ValidityPeriod with the given Credentials. It makes sense only to intersect the ValidityPeriod with other ValidityPeriods, but other Credentials are supported. Basically, it ensures that the result of intersection provides a stricter ValidityPeriod than this ValidityPeriod and the provided ValidityPeriod.

Specified by:

intersection in interface Credentials

Overrides:

intersection in class SubsetCredentials

Parameters:

c - - the ValidityPeriod to intersect with; if it is not a ValidityPeriod, the result is determined by the inherited intersection method

Returns:

the ValidityPeriod that is the intersection of this and the given ValidityPeriod