/* A simple sink actor that consumes and discards input tokens.
Copyright (c) 1998-2007 The Regents of the University of California.
All rights reserved.
Permission is hereby granted, without written agreement and without
license or royalty fees, to use, copy, modify, and distribute this
software and its documentation for any purpose, provided that the above
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of this software.
IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY
FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
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*/
package contrib.actor.lib.example;
import ptolemy.actor.lib.Sink;
import ptolemy.kernel.CompositeEntity;
import ptolemy.kernel.util.IllegalActionException;
import ptolemy.kernel.util.NameDuplicationException;
//////////////////////////////////////////////////////////////////////////
//// ExampleDiscard
/**
An example actor from the contrib directory.
<p>A simple sink actor that consumes and discards input tokens.
This actor is useful in situations where the value of an output is not
needed, but for some reason, the output cannot be left unconnected.
Also, when manipulating bus signals, this actor is useful if values
in the middle of the bus need to be discarded. Leaving the bus
unconnected in the middle will not work because no channel is allocated
to an unconnected relation in a bus.
@author Edward A. Lee
@version $Id$
@since Ptolemy II 1.0
@Pt.ProposedRating Yellow (eal)
@Pt.AcceptedRating Yellow (ssachs)
*/
public class ExampleDiscard extends Sink {
/** Construct an actor with an input multiport.
* @param container The container.
* @param name The name of this actor.
* @exception IllegalActionException If the actor cannot be contained
* by the proposed container.
* @exception NameDuplicationException If the container already has an
* actor with this name.
*/
public ExampleDiscard(CompositeEntity container, String name)
throws NameDuplicationException, IllegalActionException {
super(container, name);
}
///////////////////////////////////////////////////////////////////
//// public methods ////
/** Read one token from each input channel and discard it.
* If there is no input on a channel, then skip that channel, doing
* nothing with it.
* @exception IllegalActionException If there is no director.
*/
public void fire() throws IllegalActionException {
super.fire();
int width = input.getWidth();
for (int i = 0; i < width; i++) {
if (input.hasToken(i)) {
input.get(i);
}
}
}
}