net.jini.core.constraint
Class DelegationAbsoluteTime

java.lang.Object
  net.jini.core.constraint.DelegationAbsoluteTime

All Implemented Interfaces:

Serializable, InvocationConstraint

public final class DelegationAbsoluteTime
extends Object
implements InvocationConstraint, Serializable

Represents a constraint on delegation, such that if delegation is permitted, it be permitted only for a range of absolute times. The mechanisms and credentials used to support this are not specified by this constraint. Each end of the range is itself specified as a range, yielding four absolute times, all specified in milliseconds from midnight, January 1, 1970 UTC. The four times have the following semantics:

• minStart - delegation must not be permitted any earlier than this time
• maxStart - delegation must be permitted from this time onwards
• minStop - delegation must be permitted up until at least this time
• maxStop - delegation must not be permitted after this time

To accommodate clock skew between systems, it may be desirable to specify start times that are earlier than the current time.

The use of an instance of this class does not directly imply a ClientAuthentication.YES constraint or a Delegation.YES constraint; those must be specified separately to ensure that the client actually authenticates itself and that delegation is actually used. Because this constraint is conditional on delegation, it does not conflict with ClientAuthentication.NO or Delegation.NO.

Since:

2.0

Author:

Sun Microsystems, Inc.

See Also:

ClientAuthentication, Delegation, DelegationRelativeTime, Serialized Form

Constructor Summary

DelegationAbsoluteTime(Date minStart, Date maxStart, Date minStop, Date maxStop)
Creates a constraint with the specified dates.

DelegationAbsoluteTime(long minStart, long maxStart, long minStop, long maxStop)
Creates a constraint with the specified absolute times.

Method Summary

boolean	equals(Object obj) Two instances of this class are equal if both have the same minimum start, the same maximum start, the same minimum stop, and the same maximum stop.
long	getMaxStart() Returns the maximum start time in milliseconds from midnight, January 1, 1970 UTC.
long	getMaxStop() Returns the maximum stop time in milliseconds from midnight, January 1, 1970 UTC.
long	getMinStart() Returns the minimum start time in milliseconds from midnight, January 1, 1970 UTC.
long	getMinStop() Returns the minimum stop time in milliseconds from midnight, January 1, 1970 UTC.
int	hashCode() Returns a hash code value for this object.
String	toString() Returns a string representation of this object.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

DelegationAbsoluteTime

public DelegationAbsoluteTime(long minStart,
                              long maxStart,
                              long minStop,
                              long maxStop)

Creates a constraint with the specified absolute times.

Parameters:

minStart - the minimum start time in milliseconds from midnight, January 1, 1970 UTC

maxStart - the maximum start time in milliseconds from midnight, January 1, 1970 UTC

minStop - the minimum stop time in milliseconds from midnight, January 1, 1970 UTC

maxStop - the maximum stop time in milliseconds from midnight, January 1, 1970 UTC

Throws:

IllegalArgumentException - if minStart is greater than maxStart, or maxStart is greater than minStop, or minStop is greater than maxStop

DelegationAbsoluteTime

public DelegationAbsoluteTime(Date minStart,
                              Date maxStart,
                              Date minStop,
                              Date maxStop)

Creates a constraint with the specified dates. The arguments passed to the constructor are neither modified nor retained; subsequent changes to those arguments have no effect on the instance created.

Parameters:

minStart - the minimum start date

maxStart - the maximum start date

minStop - the minimum stop date

maxStop - the maximum stop date

Throws:

NullPointerException - if any argument is null

IllegalArgumentException - if minStart is later than maxStart, or maxStart is later than minStop, or minStop is later than maxStop

Method Detail

getMinStart

public long getMinStart()

Returns the minimum start time in milliseconds from midnight, January 1, 1970 UTC.

Returns:

the minimum start time in milliseconds from midnight, January 1, 1970 UTC

getMaxStart

public long getMaxStart()

Returns the maximum start time in milliseconds from midnight, January 1, 1970 UTC.

Returns:

the maximum start time in milliseconds from midnight, January 1, 1970 UTC

getMinStop

public long getMinStop()

Returns the minimum stop time in milliseconds from midnight, January 1, 1970 UTC.

Returns:

the minimum stop time in milliseconds from midnight, January 1, 1970 UTC

getMaxStop

public long getMaxStop()

Returns the maximum stop time in milliseconds from midnight, January 1, 1970 UTC.

Returns:

the maximum stop time in milliseconds from midnight, January 1, 1970 UTC

hashCode

public int hashCode()

Returns a hash code value for this object.

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Two instances of this class are equal if both have the same minimum start, the same maximum start, the same minimum stop, and the same maximum stop.

Overrides:

equals in class Object

toString

public String toString()

Returns a string representation of this object.

Overrides:

toString in class Object