Examples of ptolemy.kernel.util.ChangeRequest

ptolemy.kernel.util.ChangeRequest
Abstract base class for change requests. A change request is any modification to a model that might be performed during execution of the model, but where there might only be certain phases of execution during which it is safe to make the modification. Such changes are also called mutations.
A typical use of this class is to define an anonymous inner class that implements the _execute() method to bring about the desired change. The instance of that anonymous inner class is then queued with an instance of NamedObj using its requestChange() method. The execute() method must be called only once; attempting to call it multiple times will trigger an exception.
Concrete derived classes can be defined to implement mutations of a certain kind or in a certain way. Instances of these classes should be queued with a NamedObj, just like an anonymous inner class extending this class. MoMLChangeRequest is such a concrete derived class, where the mutation is specified as MoML code. @author Edward A. Lee @version $Id: ChangeRequest.java,v 1.47 2006/02/07 00:46:30 cxh Exp $ @since Ptolemy II 1.0 @Pt.ProposedRating Green (eal) @Pt.AcceptedRating Green (neuendor) @see ChangeListener

        director.fireAt(this, director.getModelTime().add(firingPeriodValue));


        if (output.getWidth() > 0) {
            output.send(0, new IntToken(_count++));
        } else {
            ChangeRequest request = new ChangeRequest(this,
                    "Find a destination") {
                protected void _execute() throws IllegalActionException {
                    CompositeEntity container = (CompositeEntity) getContainer();
                    List entityList = container.entityList();
                    Iterator entities = entityList.iterator();

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                // or this is getting invoked in the constructor, and the
                // attribute being referenced has not yet been constructed.
                // To support the latter situation, we try again (just one
                // more time) in a ChangeRequest.
                if (!_deferred) {
                    ChangeRequest request = new ChangeRequest(this,
                            "AttributeValueAttribute") {
                        protected void _execute() {
                            _setAttributeName(attributeName);
                            _deferred = false;
                        }

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            if (_checkForImplied(elements)) {
                return;
            }


            // Issue a change request, since this requires write access.
            ChangeRequest request = new ChangeRequest(container, "Send to back") {
                protected void _execute() throws IllegalActionException {
                    MoveAction.move(elements, MoveAction.TO_FIRST, container);
                }
            };

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            if (_checkForImplied(elements)) {
                return;
            }


            // Issue a change request, since this requires write access.
            ChangeRequest request = new ChangeRequest(container,
                    "Bring to front") {
                protected void _execute() throws IllegalActionException {
                    MoveAction.move(elements, MoveAction.TO_LAST, container);
                }
            };

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     *  after the next event is processed, because the next firing
     *  has already been queued.
     */
    public void doublePeriod() {
        // Create an anonymous inner class
        ChangeRequest change = new ChangeRequest(this, "test") {
            protected void _execute() throws Exception {
                _clock.period.setExpression("2.0");
                _clock.period.validate();
            }
        };

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    /** Insert a new clock.
     */
    public void insertClock() {
        // Create an anonymous inner class
        ChangeRequest change = new ChangeRequest(this, "test2") {
            protected void _execute() throws Exception {
                _clock.output.unlinkAll();
                _rec.input.unlinkAll();


                Clock clock2 = new Clock(_top, "clock2");

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                    // result in creation of yet another figure before this
                    // method even returns!
                    GraphController controller = IconController.this
                            .getController();
                    GraphModel graphModel = controller.getGraphModel();
                    ChangeRequest request = new ChangeRequest(graphModel,
                            "Set the container of a new XMLIcon.") {
                        // NOTE: The KernelException should not be thrown,
                        // but if it is, it will be handled properly.
                        protected void _execute() throws KernelException {
                            _iconsPendingContainer.remove(object);


                            // If the icon already has a container, do nothing.
                            if (icon.getContainer() != null) {
                                return;
                            }


                            // If the container already has an icon, do nothing.
                            if (object.getAttribute("_icon") != null) {
                                return;
                            }


                            icon.setContainer(object);
                        }
                    };


                    request.setPersistent(false);
                    object.requestChange(request);
                } else if (iconList.size() >= 1) {
                    // Use only the last icon in the list.
                    EditorIcon icon = (EditorIcon) iconList
                            .get(iconList.size() - 1);

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     *  @exception IllegalActionException If the change is not acceptable
     *   to the container.
     */
    public void setExpression(String expression) throws IllegalActionException {
        if (expression.equals("")) {
            ChangeRequest request = new ChangeRequest(this,
                    "Delete empty doc tag.") {
                protected void _execute() throws Exception {
                    setContainer(null);
                }
            };

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    public void managerStateChanged(Manager manager) {
        Manager.State newState = manager.getState();


        if (newState != _previousState) {
            // Clear any error reporting highlights that may be present.
            ChangeRequest request = new ChangeRequest(this,
                    "Error Highlight Clearer") {
                protected void _execute() throws Exception {
                    for (Attribute highlight : _errorHighlights) {
                        highlight.setContainer(null);
                    }
                }
            };


            // Mark the Error Highlight Clearer request as
            // non-persistant so that we don't mark the model as being
            // modified.  ptolemy/actor/lib/jni/test/Scale/Scale.xml
            // required this change.
            request.setPersistent(false);
            manager.requestChange(request);


            getFrame().report(manager.getState().getDescription());
            _previousState = newState;

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     *  indicate that it is the source of an error.
     *  @param culprit The culprit.
     */
    private void _highlightError(final Nameable culprit) {
        if (culprit instanceof NamedObj) {
            ChangeRequest request = new ChangeRequest(this, "Error Highlighter") {
                protected void _execute() throws Exception {
                    _addErrorHighlightIfNeeded(culprit);
                    NamedObj container = culprit.getContainer();
                    while (container != null) {
                        _addErrorHighlightIfNeeded(container);

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