ptolemy.domains.dde.kernel
Class ReceiverComparator

java.lang.Object
  ptolemy.domains.dde.kernel.ReceiverComparator

All Implemented Interfaces:

java.util.Comparator

public class ReceiverComparator
extends java.lang.Object
implements java.util.Comparator

A ReceiverComparator is used to sort receivers controlled by a time keeper. Receivers are sorted according to ReceiverTime and priority using the compare() method. First receivers are sorted according to ReceiverTime. ReceiverTimes are partitioned into three categories: nonnegative times, PrioritizedTimedQueue.IGNORE times and PrioritizedTimedQueue.INACTIVE times. Nonnegative times precede IGNORE times precede INACTIVE times. Within the nonnegative time category, smaller times precede larger times. The IGNORE and INACTIVE categories each consist of a single value so within these categories comparison results in equality.

If it is determined that two receivers are equivalent according to ReceiverTime, then comparison is made according to the receiver priority. A larger receiver priority will precede a smaller receiver priority. If it is determined that two receivers are equivalent according to ReceiverTime and priority, then the compare() method returns 0.

Since:

Ptolemy II 2.0

Version:

$Id: ReceiverComparator.java 57040 2010-01-27 20:52:32Z cxh $

Author:

John S. Davis II

See Also:

DDEThread

Accepted Rating:

Green (kienhuis)

Proposed Rating:

Green (davisj)

Field Summary

private TimeKeeper

_timeKeeper

Constructor Summary

ReceiverComparator(TimeKeeper timeKeeper)
Construct a ReceiverComparator.

Method Summary

int	compare(java.lang.Object object1, java.lang.Object object2) Compare two receivers according to ReceiverTime and priority.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Comparator

equals

Field Detail

_timeKeeper

private TimeKeeper _timeKeeper

Constructor Detail

ReceiverComparator

public ReceiverComparator(TimeKeeper timeKeeper)

Construct a ReceiverComparator.

Parameters:

timeKeeper - The time keeper that controls the receivers.

Method Detail

compare

public int compare(java.lang.Object object1,
                   java.lang.Object object2)

Compare two receivers according to ReceiverTime and priority.

Specified by:

compare in interface java.util.Comparator

Parameters:

object1 - The first object to be compared.

object2 - The second object to be compared.

Returns:

+1, -1 or 0 if the first receiver argument will be ordered before, after or equivalent to the second receiver argument, respectively. Base the ordering first on the ReceiverTimes. If the ReceiverTimes are equal, then base the ordering on the receiver priority.

Throws:

java.lang.ClassCastException - If object1 and obj2 are not instances of PrioritizedTimedQueue.