issrg.pba.rbac
Class Clock
java.lang.Object
issrg.pba.rbac.Time
issrg.pba.rbac.Clock
- Direct Known Subclasses:
- SystemClock
- public abstract class Clock
- extends Time
This is the abstract class that provides the RelativeValidityPeriod and
decision with current time.
The simplest implementation just gets the system time. You may wish to
provide a secure
clock, obtaining the time from a time-stamping authority.
The latch method is used to get current time that will be used in
subsequent calls
to getTime method. This use ensures that the time will remain the same
during long calculations. This is needed when making decisions to ensure
that "current
time" is the same
during the whole process.
- Author:
- A.Otenko
Constructor Summary |
Clock()
|
Method Summary |
int[] |
getEvaluationTime()
This method calls getTime() and converts it into the array of integers, so
it can
be compared by the TimeInterpreter.
|
abstract java.util.Date |
getTime()
This method returns the time returned by the last call to latch, so all
calculations
will be consistent. |
abstract java.util.Date |
latch()
This method gets the actual time and keeps it for later reference.
|
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Clock
public Clock()
latch
public abstract java.util.Date latch()
- This method gets the actual time and keeps it for later reference.
Subsequent
calls to getTime will return the same value (needed in operations extended
in time).
- Returns:
- the current time
getTime
public abstract java.util.Date getTime()
- This method returns the time returned by the last call to latch, so all
calculations
will be consistent.
- Returns:
- the time returned by the last call to latch
getEvaluationTime
public int[] getEvaluationTime()
- This method calls getTime() and converts it into the array of integers, so
it can
be compared by the TimeInterpreter.
Returns an array of integers representing the year, month, day
hour, minute, second. If the value of the array element
is -1, then the value is not specified ("don't care" when comparing)
- Overrides:
getEvaluationTime
in class Time
- Returns:
- array of integers, each element standing for y,m,d,h,m,s