/* An actor that throws a model error when it receives a true token.
Copyright (c) 1997-2007 The Regents of the University of California.
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PT_COPYRIGHT_VERSION_2
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*/
package ptolemy.actor.lib;
import ptolemy.actor.InvariantViolationException;
import ptolemy.data.BooleanToken;
import ptolemy.data.type.BaseType;
import ptolemy.kernel.CompositeEntity;
import ptolemy.kernel.util.IllegalActionException;
import ptolemy.kernel.util.NameDuplicationException;
import ptolemy.kernel.util.NamedObj;
import ptolemy.kernel.util.StringAttribute;
//////////////////////////////////////////////////////////////////////////
//// ThrowModelError
/**
<p>An actor that throws a model error when it receives a true token
on any input channel. The message reported in the model error is
given by the <i>message</i> parameter.
The inputs are read and checked in the postfire() method only.
</p><p>
A model error is an exception that is passed up the containment
hierarchy rather than being immediately thrown. Any container
in the containment hierarchy may choose to handle the error.
By default, containers will pass and delegate the error to their
container, if they have one, and throw an exception if they
don't. But some containers might do more with the error.</p>
@author Haiyang Zheng
@version $Id: ThrowModelError.java,v 1.28 2007/02/04 01:27:09 cxh Exp $
@since Ptolemy II 2.1
@Pt.ProposedRating Green (eal)
@Pt.AcceptedRating Green (neuendor)
@see ThrowException
@see ptolemy.kernel.util.NamedObj#handleModelError(NamedObj, IllegalActionException)
*/
public class ThrowModelError extends Sink {
/** Construct an actor in the specified container with the specified
* name.
* @param container The container.
* @param name The name of this actor within the container.
* @exception IllegalActionException If the actor cannot be contained
* by the proposed container.
* @exception NameDuplicationException If the name coincides with
* an actor already in the container.
*/
public ThrowModelError(CompositeEntity container, String name)
throws IllegalActionException, NameDuplicationException {
super(container, name);
input.setTypeEquals(BaseType.BOOLEAN);
message = new StringAttribute(this, "message");
message.setExpression("A model error.");
}
///////////////////////////////////////////////////////////////////
//// ports and parameters ////
/** The message reported in the exception. */
public StringAttribute message;
///////////////////////////////////////////////////////////////////
//// public methods ////
/** Read one token from each input channel that has a token,
* and if any token is true, invoke the model error handler.
* @exception IllegalActionException If thrown by the parent class.
* @return Whatever the base class returns (probably true).
*/
public boolean postfire() throws IllegalActionException {
boolean result = false;
// NOTE: We need to consume data on all channels that have data.
// If we don't then DE will go into an infinite loop.
for (int i = 0; i < input.getWidth(); i++) {
if (input.hasToken(i)) {
if (((BooleanToken) input.get(i)).booleanValue()) {
result = true;
}
}
}
if (result) {
//FIXME: instead of throw an IllegalActionException,
// an InvariantViolationException is thrown. Should we
// configure the "model error" type?
//handleModelError(this,
// new IllegalActionException(this, message.getExpression()));
handleModelError(this, new InvariantViolationException(this,
message.getExpression()));
}
return super.postfire();
}
}