/* Actor representing one of several refinements.
Copyright (c) 2002-2006 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
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ENHANCEMENTS, OR MODIFICATIONS.
PT_COPYRIGHT_VERSION_2
COPYRIGHTENDKEY
*/
package ptolemy.actor.lib.hoc;
import java.util.Iterator;
import ptolemy.actor.IOPort;
import ptolemy.actor.parameters.ParameterPort;
import ptolemy.actor.parameters.PortParameter;
import ptolemy.kernel.ComponentEntity;
import ptolemy.kernel.CompositeEntity;
import ptolemy.kernel.util.IllegalActionException;
import ptolemy.kernel.util.NameDuplicationException;
import ptolemy.kernel.util.StringAttribute;
import ptolemy.kernel.util.Workspace;
//////////////////////////////////////////////////////////////////////////
//// Case
/**
An actor that executes one of several refinements depending on the
value provided by the <i>control</i> port-parameter. To use this,
look inside, add refinement cases, and populate them with computations.
Each refinement is a composite that is required to have its own director.
The name of the refinement is value that the control must have to
execute this refinement.
This actor always provides one case called "default". This is
the refinement that is executed if no other refinement matches
the control input. All refinements have the same ports,
and adding ports to any one refinement or to the case actor
itself results in identical ports being added to all refinements.
@author Edward A. Lee
@version $Id: Case.java,v 1.29 2007/12/07 06:26:06 cxh Exp $
@since Ptolemy II 5.2
@Pt.ProposedRating Yellow (eal)
@Pt.AcceptedRating Red (reviewmoderator)
*/
public class Case extends MultiCompositeActor {
/** Construct
* a modal model with a name and a container.
* The container argument must not be null, or a
* NullPointerException will be thrown.
* @param container The container.
* @param name The name of this actor.
* @exception IllegalActionException If the container is incompatible
* with this actor.
* @exception NameDuplicationException If the name coincides with
* an actor already in the container.
*/
public Case(CompositeEntity container, String name)
throws IllegalActionException, NameDuplicationException {
super(container, name);
// Create the control port.
control = new PortParameter(this, "control");
// FIXME: This is awkward... If I provide some
// non-boolean control input, I get obscure type
// conflict error messages and have to change this
// to match.
control.setExpression("true");
ParameterPort port = control.getPort();
// Put the control input on the bottom of the actor.
StringAttribute controlCardinal = new StringAttribute(port, "_cardinal");
controlCardinal.setExpression("SOUTH");
// Create the default refinement.
_default = newRefinement("default");
// Create the director.
_director = _createDirector();
}
///////////////////////////////////////////////////////////////////
//// public variables ////
/** The input port-parameter on which the control token is provided.
* This can have any type, and is initialized with a default value
* of true.
*/
public PortParameter control;
///////////////////////////////////////////////////////////////////
//// public methods ////
/** Override the base class to ensure that the _default member
* points to the default refinement.
* @param workspace The workspace for the new object.
* @return A new Case.
* @exception CloneNotSupportedException If any of the attributes
* cannot be cloned.
*/
public Object clone(Workspace workspace) throws CloneNotSupportedException {
Case newObject = (Case) super.clone(workspace);
newObject._default = (Refinement) newObject.getEntity("default");
newObject._current = newObject._default;
newObject._director = (CaseDirector) newObject
.getAttribute("_director");
return newObject;
}
/** Return the current refinement, or null if prefire() has not
* yet been invoked.
* @return The current refinement.
*/
public Refinement getCurrentRefinement() {
return _current;
}
/** Override the base class to not read inputs, since this has been
* done in prefire(). Fire the current refinement, and then
* send any output data created by calling the local director's
* transferOutputs method.
* @exception IllegalActionException If there is no director, or if
* the director's fire() method throws it, or if the actor is not
* opaque.
*/
public void fire() throws IllegalActionException {
if (_debugging) {
_debug("Calling fire()");
}
try {
_workspace.getReadAccess();
_director.fire();
if (_stopRequested) {
return;
}
// Use the local director to transfer outputs.
Iterator outports = outputPortList().iterator();
while (outports.hasNext() && !_stopRequested) {
IOPort p = (IOPort) outports.next();
_director.transferOutputs(p);
}
} finally {
_workspace.doneReading();
}
if (_debugging) {
_debug("Called fire()");
}
}
/** Create a new refinement with the specified name.
* @param name The name of the refinement.
* @return The new refinement.
* @exception IllegalActionException If the refinement cannot be created.
* @exception NameDuplicationException If a refinement already
* exists with this name.
*/
public Refinement newRefinement(String name) throws IllegalActionException,
NameDuplicationException {
return new Refinement(this, name);
}
/** Return the class name for refinements that this Case actor
* expects to contain.
* @return The string "ptolemy.actor.lib.hoc.Refinement".
*/
public String refinementClassName() {
return "ptolemy.actor.lib.hoc.Refinement";
}
///////////////////////////////////////////////////////////////////
//// protected methods ////
/** Override the base class to ensure that the default refinement remains
* last.
* @exception IllegalActionException If the entity has no name, or the
* action would result in a recursive containment structure.
* @exception NameDuplicationException If the name collides with a name
* already in the entity.
*/
protected void _addEntity(ComponentEntity entity)
throws IllegalActionException, NameDuplicationException {
super._addEntity(entity);
if (entity instanceof Refinement) {
// Ensure that the default refinement remains the last one.
// Note however that this is called on the default itself,
// at which time the local member has not been set.
if (_default != null) {
_default.moveToLast();
}
}
}
/** Create a director. This base class creates an instance of CaseDirector.
* @return The created director.
* @exception IllegalActionException If the director cannot be created.
* @exception NameDuplicationException If there is already an
* attribute with the name "_director".
*/
protected CaseDirector _createDirector() throws IllegalActionException,
NameDuplicationException {
return new CaseDirector(this, "_director");
}
///////////////////////////////////////////////////////////////////
//// protected variables ////
/** The current refinement. */
protected Refinement _current;
/** The default refinement. */
protected Refinement _default;
/** The director. */
protected CaseDirector _director;
}