ptolemy.vergil.actor

Class ActorGraphModel

java.lang.Object

diva.graph.AbstractGraphModel

diva.graph.modular.ModularGraphModel

ptolemy.vergil.basic.AbstractBasicGraphModel

ptolemy.vergil.actor.ActorGraphModel

All Implemented Interfaces:

GraphModel, ChangeListener

Direct Known Subclasses:

GTFrameController.GTActorGraphModel

public class ActorGraphModel
extends AbstractBasicGraphModel

This class represents one level of hierarchy of a Ptolemy II model. The graph model represents attributes, ports, entities and relations as nodes. Entities and attributes are represented in the model by the icon that is used to visually depict them. Relations are represented in the model by its vertices (which are visual elements that generally exist in multiple places in a visual rendition). Ports represent themselves in the model.

In the terminology of diva, the graph elements are "nodes" (icons, vertices, and ports), and the "edges" link them. Edges are represented in the model by instances of the Link class. Edges may link a port and a vertex, or a port and another port. For visual simplicity, both types of edges are represented by an instance of the Link class. If an edge is placed between a port and a vertex then the Link represents a Ptolemy II link between the port and the vertex's Relation. However, if an edge is placed between two ports, then it represents a relation (with no vertex) and links from the relation to each port (in Ptolemy II, this is called a "connection").

This model uses a ptolemy change listener to detect changes to the model that do not originate from this model. These changes are propagated as structure changed graph events to all graphListeners registered with this model. This mechanism allows a graph visualization of a ptolemy model to remain synchronized with the state of a mutating model.

Since:

Ptolemy II 2.0

Version:

$Id$

Author:

Steve Neuendorffer, Contributor: Edward A. Lee, Bert Rodiers

Pt.AcceptedRating:

Red (johnr)

Pt.ProposedRating:

Yellow (neuendor)

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
class	ActorGraphModel.ExternalPortModel The model for ports that make external connections to this graph.
static class	ActorGraphModel.IconModel The model for an icon that contains ports.
class	ActorGraphModel.LinkModel The model for links that connect two ports, or a port and a vertex.
class	ActorGraphModel.PortModel The model for ports that are contained in icons in this graph.
class	ActorGraphModel.VertexModel The model for vertexes that are contained within the relations of the ptolemy model.

Field Summary

Fields inherited from class diva.graph.AbstractGraphModel

_graphListeners

Constructor Summary

Constructors

Constructor and Description
ActorGraphModel(NamedObj composite) Construct a new graph model whose root is the given composite entity.

Method Summary

Modifier and Type	Method and Description
protected java.util.Set<?>	_getLinkSet() Get an unmodifiable copy of the link set.
protected void	_removeLink(Link link) Remove a link from the link set.
protected boolean	_update() Update the graph model.
void	changeExecuted(ChangeRequest change) This implementation will delegate to the implementation in the parent class and will additionally update the model in case it is necessary.
void	disconnectEdge(java.lang.Object eventSource, java.lang.Object edge) Disconnect an edge from its two endpoints and notify graph listeners with an EDGE_HEAD_CHANGED and an EDGE_TAIL_CHANGED event whose source is the given source.
CompositeModel	getCompositeModel(java.lang.Object composite) Return the model for the given composite object.
java.lang.String	getDeleteEdgeMoML(java.lang.Object edge) Return a MoML String that will delete the given edge from the Ptolemy model.
java.lang.String	getDeleteNodeMoML(java.lang.Object node) Return a MoML String that will delete the given node from the Ptolemy model.
EdgeModel	getEdgeModel(java.lang.Object edge) Return the model for the given edge object.
ActorGraphModel.ExternalPortModel	getExternalPortModel() Get the external port model.
ActorGraphModel.IconModel	getIconModel() Get the icon model.
ActorGraphModel.LinkModel	getLinkModel() Return the model for edge objects that are instance of Link.
NodeModel	getNodeModel(java.lang.Object node) Return the node model for the given object.
ActorGraphModel.PortModel	getPortModel() Get the port model.
java.lang.Object	getSemanticObject(java.lang.Object element) Return the semantic object corresponding to the given node, edge, or composite.
ActorGraphModel.VertexModel	getVertexModel() Get the vertex model.
void	removeNode(java.lang.Object eventSource, java.lang.Object node) Delete a node from its parent graph and notify graph listeners with a NODE_REMOVED event.

Methods inherited from class ptolemy.vergil.basic.AbstractBasicGraphModel

_getLocation, changeFailed, getProperty, getPtolemyModel, isNode, removeListeners, setProperty, setSemanticObject

Methods inherited from class diva.graph.modular.ModularGraphModel

containsNode, getHead, getNodeCount, getParent, getRoot, getTail, inEdges, isComposite, isDirected, isEdge, nodes, nodesAfterEdges, nodesBeforeEdges, outEdges

Methods inherited from class diva.graph.AbstractGraphModel

addGraphListener, dispatchGraphEvent, removeGraphListener, setDispatchEnabled

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ActorGraphModel

public ActorGraphModel(NamedObj composite)

Construct a new graph model whose root is the given composite entity.

Parameters:

composite - The top-level composite entity for the model.

Method Detail

changeExecuted

public void changeExecuted(ChangeRequest change)

This implementation will delegate to the implementation in the parent class and will additionally update the model in case it is necessary. This is typically the case when a link is created to another link. If this existing link has a vertex as head or tail, we will connect with the vertex, otherwise we will remove the old link, create a new vertex, link the head and tail of the existing link with the vertex and link the new link with the vertex. It is possible to link with an existing link. If this existing link has a vertex as head or tail, we will connect with the vertex, otherwise we will remove the old link, create a new vertex, link the head and tail of the existing link with the vertex and link the new link with the vertex. In the latter case the parent class won't call _update as a result of an optimization, and hence we do it here.

Specified by:

changeExecuted in interface ChangeListener

Overrides:

changeExecuted in class AbstractBasicGraphModel

Parameters:

change - The change that has been executed.

disconnectEdge

public void disconnectEdge(java.lang.Object eventSource,
                           java.lang.Object edge)

Disconnect an edge from its two endpoints and notify graph listeners with an EDGE_HEAD_CHANGED and an EDGE_TAIL_CHANGED event whose source is the given source.

Specified by:

disconnectEdge in class AbstractBasicGraphModel

Parameters:

eventSource - The source of the event that will be dispatched, e.g. the view that made this call.

edge - The edge.

getCompositeModel

public CompositeModel getCompositeModel(java.lang.Object composite)

Return the model for the given composite object. In this class, return an instance of CompositePtolemyModel if the object is the root object of this graph model, and return an instance of IconModel if the object is a location contained by an entity. Otherwise return null.

Overrides:

getCompositeModel in class AbstractBasicGraphModel

Parameters:

composite - A composite object.

Returns:

A model of a composite node.

getDeleteEdgeMoML

public java.lang.String getDeleteEdgeMoML(java.lang.Object edge)

Return a MoML String that will delete the given edge from the Ptolemy model.

Specified by:

getDeleteEdgeMoML in class AbstractBasicGraphModel

Parameters:

edge - The edge.

Returns:

A valid MoML string.

getDeleteNodeMoML

public java.lang.String getDeleteNodeMoML(java.lang.Object node)

Return a MoML String that will delete the given node from the Ptolemy model.

Specified by:

getDeleteNodeMoML in class AbstractBasicGraphModel

Parameters:

node - The node.

Returns:

A valid MoML string.

getEdgeModel

public EdgeModel getEdgeModel(java.lang.Object edge)

Return the model for the given edge object. If the object is not an edge, then return null.

Specified by:

getEdgeModel in class ModularGraphModel

Parameters:

edge - An object which is assumed to be in this graph model.

Returns:

An instance of LinkModel if the object is a Link. Otherwise return null.

getLinkModel

public ActorGraphModel.LinkModel getLinkModel()

Return the model for edge objects that are instance of Link. This will return the same object as getEdgeModel() when the argument is a link.

Returns:

The model for links.

getNodeModel

public NodeModel getNodeModel(java.lang.Object node)

Return the node model for the given object. If the object is not a node, then return null. The argument should be either an instance of Port or Vertex, or it implements Locatable.

Overrides:

getNodeModel in class AbstractBasicGraphModel

Parameters:

node - An object which is assumed to be in this graph model.

Returns:

The node model for the specified node, or null if there is none.

getSemanticObject

public java.lang.Object getSemanticObject(java.lang.Object element)

Return the semantic object corresponding to the given node, edge, or composite. A "semantic object" is an object associated with a node in the graph. In this case, if the node is icon, the semantic object is an entity. If it is a vertex or a link, the semantic object is a relation. If it is a port, then the semantic object is the port itself.

Specified by:

getSemanticObject in interface GraphModel

Overrides:

getSemanticObject in class AbstractBasicGraphModel

Parameters:

element - A graph element.

Returns:

The semantic object associated with this element, or null if the object is not recognized.

See Also:

AbstractBasicGraphModel.setSemanticObject(Object, Object)

removeNode

public void removeNode(java.lang.Object eventSource,
                       java.lang.Object node)

Delete a node from its parent graph and notify graph listeners with a NODE_REMOVED event.

Specified by:

removeNode in class AbstractBasicGraphModel

Parameters:

eventSource - The source of the event that will be dispatched, e.g. the view that made this call.

node - The node.

getIconModel

public ActorGraphModel.IconModel getIconModel()

Get the icon model.

Returns:

The icon model.

getPortModel

public ActorGraphModel.PortModel getPortModel()

Get the port model.

Returns:

The port model.

getExternalPortModel

public ActorGraphModel.ExternalPortModel getExternalPortModel()

Get the external port model.

Returns:

The external port model.

getVertexModel

public ActorGraphModel.VertexModel getVertexModel()

Get the vertex model.

Returns:

The vertex model.

_getLinkSet

protected java.util.Set<?> _getLinkSet()

Get an unmodifiable copy of the link set.

Returns:

The link set.

_removeLink

protected void _removeLink(Link link)

Remove a link from the link set. This function is not made synchronized. Concurrent modification on the link set should be avoided.

Parameters:

link - The link to be removed.

_update

protected boolean _update()

Update the graph model. This is called whenever a change request is executed. In this class the internal set of link objects is created to represent each of the links in the graph, and to remove any link objects that are incorrect (e.g., do not have both ends in the model). This method is usually called just before issuing a graph event. If this method returns false, then the graph event should not be issued, because further changes are necessary.

Overrides:

_update in class AbstractBasicGraphModel

Returns:

True if the model was successfully updated, or false if further change requests were queued.