/* An actor that throws an exception when it receives a true token.
Copyright (c) 1997-2005 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
copyright notice and the following two paragraphs appear in all copies
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
THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE
PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF
CALIFORNIA HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
ENHANCEMENTS, OR MODIFICATIONS.
PT_COPYRIGHT_VERSION_2
COPYRIGHTENDKEY
*/
package ptolemy.actor.lib;
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.StringAttribute;
//////////////////////////////////////////////////////////////////////////
//// ThrowException
/**
An actor that throws an IllegalActionException when it receives a true token
on any input channel. The message reported in the exception is
given by the <i>message</i> parameter.
The inputs are read and checked in the postfire() method only.
@author Edward A. Lee
@version $Id$
@since Ptolemy II 2.1
@Pt.ProposedRating Green (eal)
@Pt.AcceptedRating Green (neuendor)
@see ThrowModelError
*/
public class ThrowException 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 ThrowException(CompositeEntity container, String name)
throws IllegalActionException, NameDuplicationException {
super(container, name);
input.setTypeEquals(BaseType.BOOLEAN);
message = new StringAttribute(this, "message");
message.setExpression("Model triggered an exception.");
}
///////////////////////////////////////////////////////////////////
//// ports and parameters ////
/** The message reported in the exception, which is a string that
* defaults to "Model triggered an exception".
*/
public StringAttribute message;
///////////////////////////////////////////////////////////////////
//// public methods ////
/** Read one token from each input channel that has a token,
* and if any token is true, throw an exception.
* @exception IllegalActionException If FIXME
* @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) {
throw new IllegalActionException(this, message.getExpression());
}
return super.postfire();
}
}