Examples of ptolemy.moml.MoMLChangeRequest

ptolemy.moml.MoMLChangeRequest
A mutation request specified in MoML. This class provides the preferred mechanism for implementing mutations on a model while it is executing. To use it, create an instance of this class, specifying MoML code as an argument to the constructor. Then queue the instance of this class with a composite entity by calling its requestChange() method.
If a context is given to the constructor, then the MoML will be executed in that context. If that context has other objects that defer their MoML definitions to it (i.e., it is a class definition and there are instances of the class), then the MoML will also be executed in the context of those objects that defer to it. Thus, the change to a class will propagate to instances. If the context is (deeply) contained by another object that has objects that defer their MoML definitions to it, then the changes are also propagated to those objects. Thus, even when class definitions are nested within class definitions, a change within a class definition will propagate to all instances of the class(es).
The parser used to implement the change will be the parser contained by a ParserAttribute of the top-level element of the context. If no context is given, or there is no ParserAttribute in its top level, then a new parser is created, and a new ParserAttribute is placed in the top level.
Note that if a context is specified that is above a class definition, and a change within the class definition is made by referencing the contents of the class definition using dotted names, then the change will not propagate. Thus, changes should be made in the most specific context (lowest level in the hierarchy) possible. @author Edward A. Lee @version $Id: MoMLChangeRequest.java,v 1.71 2006/02/27 22:24:53 cxh Exp $ @since Ptolemy II 1.0 @Pt.ProposedRating Yellow (eal) @Pt.AcceptedRating Red (neuendor)

                        + transition.getName(container)
                        + "\"><property name=\"refinementName\" value=\""
                        + currentRefinements + "\"/></relation></group>";
            }


            MoMLChangeRequest change = new MoMLChangeRequest(this, container,
                    moml) {
                protected void _execute() throws Exception {
                    super._execute();


                    // Mirror the ports of the container in the refinement.

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        // modified.
        NamedObj context = _attributeToEdit.getContainer();
        String request = "<property name=\"" + _attributeToEdit.getName()
                + "\" value=\""
                + StringUtilities.escapeForXML(_factory.getText()) + "\"/>";
        context.requestChange(new MoMLChangeRequest(this, context, request));
        setModified(false);
        return true;
    }

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            String moml = "<group><relation name=\""
                    + transition.getName(container)
                    + "\"><property name=\"refinementName\" value=\""
                    + newRefinements.toString() + "\"/></relation>" + removal
                    + "</group>";
            MoMLChangeRequest change = new MoMLChangeRequest(this, container,
                    moml);
            container.requestChange(change);
        }

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            // An XMLIcon is not a custom icon, so don't remove it.
            if (!(icon instanceof XMLIcon)) {
                String moml = "<deleteProperty name=\"" + icon.getName()
                        + "\"/>";
                MoMLChangeRequest request = new MoMLChangeRequest(this, object,
                        moml);
                object.requestChange(request);
            }
        }
    }

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                // Object is already a class. Do nothing.
                return;
            }


            String moml = "<class name=\"" + object.getName() + "\"/>";
            MoMLChangeRequest request = new MoMLChangeRequest(this, container,
                    moml);
            container.requestChange(request);
        }

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                // other link. This will only happen when we've deleted
                // the state at one end of the model.
                // Note that the source is NOT the graph model, so this
                // will trigger the ChangeRequest listener to
                // redraw the graph again.
                MoMLChangeRequest request = new MoMLChangeRequest(container,
                        container, "<deleteRelation name=\""
                                + relation.getName(container) + "\"/>\n");


                // Need to merge the undo for this request in with one that
                // triggered it
                request.setMergeWithPreviousUndo(true);
                request.setUndoable(true);
                container.requestChange(request);
                return false;
            }
        }

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            // Make the request in the context of the container.
            final NamedObj container = getPtolemyModel();
            moml.append(_deleteRelation(container, linkRelation));


            MoMLChangeRequest request = new MoMLChangeRequest(
                    FSMGraphModel.this, container, moml.toString()) {
                protected void _execute() throws Exception {
                    super._execute();
                    link.setHead(null);
                    link.setTail(null);
                    link.setRelation(null);
                }
            };


            // Handle what happens if the mutation fails.
            request.addChangeListener(new ChangeListener() {
                public void changeFailed(ChangeRequest change,
                        Exception exception) {
                    // Ignore... nothing we can do about it anyway.
                }


                public void changeExecuted(ChangeRequest change) {
                    _linkSet.remove(edge);
                }
            });
            request.setUndoable(true);
            container.requestChange(request);
        }

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            moml.append("</group>\n");
            failmoml.append("</group>\n");


            final String relationNameToAdd = relationName;
            MoMLChangeRequest request = new MoMLChangeRequest(
                    FSMGraphModel.this, container, moml.toString()) {
                protected void _execute() throws Exception {
                    super._execute();
                    link.setHead(newArcHead);


                    if (relationNameToAdd != null) {
                        ComponentRelation relation = ((CompositeEntity) getPtolemyModel())
                                .getRelation(relationNameToAdd);
                        link.setRelation(relation);
                    }
                }
            };


            // Handle what happens if the mutation fails.
            request.addChangeListener(new ChangeListener() {
                public void changeFailed(ChangeRequest change,
                        Exception exception) {
                    // If we fail here, then we remove the link entirely.
                    _linkSet.remove(link);
                    link.setHead(null);
                    link.setTail(null);
                    link.setRelation(null);


                    // and queue a new change request to clean up the model
                    // Note: JDK1.2.2 requires that this variable not be
                    // called request or we get a compile error.
                    MoMLChangeRequest requestChange = new MoMLChangeRequest(
                            FSMGraphModel.this, container, failmoml.toString());


                    // Fail moml execution not undoable
                    container.requestChange(requestChange);
                }

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            moml.append("</group>\n");
            failmoml.append("</group>\n");


            final String relationNameToAdd = relationName;


            MoMLChangeRequest request = new MoMLChangeRequest(
                    FSMGraphModel.this, container, moml.toString()) {
                protected void _execute() throws Exception {
                    super._execute();
                    link.setTail(newArcTail);


                    if (relationNameToAdd != null) {
                        link.setRelation(((CompositeEntity) getPtolemyModel())
                                .getRelation(relationNameToAdd));
                    }
                }
            };


            // Handle what happens if the mutation fails.
            request.addChangeListener(new ChangeListener() {
                public void changeFailed(ChangeRequest change,
                        Exception exception) {
                    // If we fail here, then we remove the link entirely.
                    _linkSet.remove(link);
                    link.setHead(null);
                    link.setTail(null);
                    link.setRelation(null);


                    // and queue a new change request to clean up the model
                    // Note: JDK1.2.2 requires that this variable not be
                    // called request or we get a compile error.
                    MoMLChangeRequest requestChange = new MoMLChangeRequest(
                            FSMGraphModel.this, container, failmoml.toString());


                    // fail moml execution not undaoble
                    container.requestChange(requestChange);
                }

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                }
            }


            moml.append("</port>");


            MoMLChangeRequest request = new MoMLChangeRequest(this, toplevel,
                    moml.toString()) {
                protected void _execute() throws Exception {
                    super._execute();


                    // Set the location of the icon.
                    // Note that this really needs to be done after
                    // the change request has succeeded, which is why
                    // it is done here.  When the graph controller
                    // gets around to handling this, it will draw
                    // the icon at this location.
                    // NOTE: The cast is safe because it is checked
                    // above, and presumably a reasonable GUI would
                    // provide no mechanism for creating a port on
                    // something that is not an entity.
                    NamedObj newObject = ((Entity) toplevel).getPort(portName);
                    Location location = (Location) newObject
                            .getAttribute(locationName);
                    location.setLocation(point);
                }
            };


            request.setUndoable(true);
            toplevel.requestChange(request);


            try {
                request.waitForCompletion();
            } catch (Exception ex) {
                ex.printStackTrace();
                throw new GraphException(ex);
            }
        }

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