org.netbeans.api.visual.graph.GraphPinScene Maven / Gradle / Ivy
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package org.netbeans.api.visual.graph;
import org.netbeans.api.visual.model.ObjectScene;
import org.netbeans.api.visual.widget.Widget;
import org.netbeans.modules.visual.util.GeomUtil;
import java.util.*;
/**
* This class holds and manages graph-oriented model.
*
* In comparison with the GraphScene class, in this class the graph consists of nodes, edges and pins. Each pin is assigned to a node (the assigned cannot be change at any time.
* Each edge could be attach to a single source and target pin.
*
* The class is abstract and manages only data model and mapping with widgets. The graphics (widgets) has to be supplied
* by a developer by overriding the attachNodeWidget, attachPinWidget, attachEdgeWidget, attachEdgeSourceAnchor and attachEdgeTargetAnchor abstract methods.
*
* This class is using generics and allows you to specify type representation for nodes and edges in the graph model. Example:
*
* class MyGraph extends GraphScene<MyNode, MyEdge, MyPin> { ... }
*
* Since the type of nodes, edges and pins could be the same, all node, edge and pin instances have to be unique within the whole scene.
*
* @author David Kaspar
*/
// TODO - is it asserted that removing a node removes all its pins
// TODO - is it asserted that removing a pin disconnects all the attached edges
public abstract class GraphPinScene extends ObjectScene {
private HashSet nodes = new HashSet ();
private Set nodesUm = Collections.unmodifiableSet (nodes);
private HashSet edges = new HashSet ();
private Set edgesUm = Collections.unmodifiableSet (edges);
private HashSet pins = new HashSet
();
private Set
pinsUm = Collections.unmodifiableSet (pins);
private HashMap> nodePins = new HashMap> ();
private HashMap pinNodes = new HashMap ();
private HashMap edgeSourcePins = new HashMap ();
private HashMap edgeTargetPins = new HashMap ();
private HashMap> pinInputEdges = new HashMap> ();
private HashMap> pinOutputEdges = new HashMap> ();
/**
* Creates a graph scene.
*/
public GraphPinScene () {
}
/**
* Adds a node.
* @param node the node to be added; the node must not be null, must not be already in the model, must be unique in the model
* (means: there is no other node, edge or pin in the model has is equal to this node)
* and must not be a Widget
* @return the widget that is created by attachNodeWidget; null if the node is non-visual
*/
public final Widget addNode (N node) {
assert node != null : "Null parameter";
assert ! nodes.contains (node) : "Node (" + node + ") already added";
Widget widget = attachNodeWidget (node);
nodes.add (node);
nodePins.put (node, new HashSet ());
addObject (node, widget);
notifyNodeAdded (node, widget);
return widget;
}
/**
* Removes a node with all pins that are assigned to the node.
* @param node the node to be removed; the node must not be null and must be already in the model
*/
public final void removeNode (N node) {
assert node != null && nodes.contains (node);
for (P pin : new HashSet
(nodePins.get (node)))
removePin (pin);
nodes.remove (node);
nodePins.remove (node);
Widget widget = findWidget (node);
detachNodeWidget (node, widget);
removeObject (node);
}
/**
* Removes a node with all pins that are assign to the node and with all edges that are connected to the pins.
* @param node the node to be removed; the node must not be null and must be already in the model
*/
public final void removeNodeWithEdges (N node) {
assert node != null && nodes.contains (node);
for (P pin : nodePins.get (node))
for (E edge : findPinEdges (pin, true, true))
if (isEdge (edge))
removeEdge (edge);
removeNode (node);
}
/**
* Returns a collection of all nodes registered in the graph model.
* @return the collection of all nodes registered in the graph model
*/
public final Collection getNodes () {
return nodesUm;
}
/**
* Adds an edge.
* @param edge the edge to be added; the edge must not be null, must not be already in the model, must be unique in the model
* (means: there is no other node, edge or pin in the model has is equal to this edge)
* and must not be a Widget
* @return the widget that is created by attachEdgeWidget; null if the edge is non-visual
*/
public final Widget addEdge (E edge) {
assert edge != null && ! edges.contains (edge);
Widget widget = attachEdgeWidget (edge);
edges.add (edge);
addObject (edge, widget);
notifyEdgeAdded (edge, widget);
return widget;
}
/**
* Removes an edge and detaches it from its source and target pins.
* @param edge the edge to be removed; the edge must not be null and must be already in the model
*/
public final void removeEdge (E edge) {
assert edge != null && edges.contains (edge);
setEdgeSource (edge, null);
setEdgeTarget (edge, null);
edges.remove (edge);
edgeSourcePins.remove (edge);
edgeTargetPins.remove (edge);
Widget widget = findWidget (edge);
detachEdgeWidget (edge, widget);
removeObject (edge);
}
/**
* Returns a collection of all edges registered in the graph model.
* @return the collection of all edges registered in the graph model
*/
public final Collection getEdges () {
return edgesUm;
}
/**
* Adds a pin and assigns it to a specified node.
* @param node the node where the pin is assigned to
* @param pin the pin to be added; the pin must not be null, must not be already in the model, must be unique in the model
* (means: there is no other node, edge or pin in the model has is equal to this pin)
* and must not be a Widget
* @return the widget that is created by attachPinWidget; null if the pin is non-visual
*/
public final Widget addPin (N node, P pin) {
assert node != null && pin != null && ! pins.contains (pin);
Widget widget = attachPinWidget (node, pin);
pins.add (pin);
nodePins.get (node).add (pin);
pinNodes.put (pin, node);
pinInputEdges.put (pin, new ArrayList ());
pinOutputEdges.put (pin, new ArrayList ());
addObject (pin, widget);
notifyPinAdded (node, pin, widget);
return widget;
}
/**
* Removes an pin and detaches all edges that are connected to it.
* @param pin the pin to be removed; the pin must not be null and must be already in the model
*/
public final void removePin (P pin) {
assert pin != null && pins.contains (pin);
for (E edge : findPinEdges (pin, true, false))
setEdgeSource (edge, null);
for (E edge : findPinEdges (pin, false, true))
setEdgeTarget (edge, null);
pins.remove (pin);
N node = pinNodes.remove (pin);
nodePins.get (node).remove (pin);
pinInputEdges.remove (pin);
pinOutputEdges.remove (pin);
Widget widget = findWidget (pin);
detachPinWidget (pin, widget);
removeObject (pin);
}
/**
* Removes a pin with all edges that are connected to the pin.
* @param pin the pin to be removed; the pin must not be null and must be already in the model
*/
public final void removePinWithEdges (P pin) {
assert pin != null && pins.contains (pin);
for (E edge : findPinEdges (pin, true, true))
if (isEdge (edge))
removeEdge (edge);
removePin (pin);
}
/**
* Returns a node where the pin assigned to.
* @param pin the pin
* @return the node where the pin assigned to.
*/
public final N getPinNode (P pin) {
return pinNodes.get (pin);
}
/**
* Returns all pins registered in the graph model.
* @return the collection of all pins registered in the graph model
*/
public final Collection getPins () {
return pinsUm;
}
/**
* Returns a collection of pins that are assigned to a specified node
* @param node the node
* @return the collection of pins; null if node does not exist in the scene
*/
public final Collection
getNodePins (N node) {
if (node == null)
return null;
HashSet
ps = nodePins.get (node);
if (ps == null)
return null;
return Collections.unmodifiableCollection (ps);
}
/**
* Sets an edge source.
* @param edge the edge which source is going to be changed
* @param sourcePin the source pin; if null, then the edge source will be detached
*/
public final void setEdgeSource (E edge, P sourcePin) {
assert edge != null && edges.contains (edge);
if (sourcePin != null)
assert pins.contains (sourcePin);
P oldPin = edgeSourcePins.put (edge, sourcePin);
if (GeomUtil.equals (oldPin, sourcePin))
return;
if (oldPin != null)
pinOutputEdges.get (oldPin).remove (edge);
if (sourcePin != null)
pinOutputEdges.get (sourcePin).add (edge);
attachEdgeSourceAnchor (edge, oldPin, sourcePin);
}
/**
* Sets an edge target.
* @param edge the edge which target is going to be changed
* @param targetPin the target pin; if null, then the edge target will be detached
*/
public final void setEdgeTarget (E edge, P targetPin) {
assert edge != null && edges.contains (edge);
if (targetPin != null)
assert pins.contains (targetPin);
P oldPin = edgeTargetPins.put (edge, targetPin);
if (GeomUtil.equals (oldPin, targetPin))
return;
if (oldPin != null)
pinInputEdges.get (oldPin).remove (edge);
if (targetPin != null)
pinInputEdges.get (targetPin).add (edge);
attachEdgeTargetAnchor (edge, oldPin, targetPin);
}
/**
* Returns an edge source.
* @param edge the edge
* @return the edge source; null, if edge does not have source attached
*/
public final P getEdgeSource (E edge) {
return edgeSourcePins.get (edge);
}
/**
* Returns an edge target.
* @param edge the edge
* @return the edge target; null, if edge does not have target attached
*/
public final P getEdgeTarget (E edge) {
return edgeTargetPins.get (edge);
}
/**
* Returns a collection of edges that are attached to a specified pin.
* @param pin the pin which edges connections are searched for
* @param allowOutputEdges if true, the output edges are included in the collection; if false, the output edges are not included
* @param allowInputEdges if true, the input edges are included in the collection; if false, the input edges are not included
* @return the collection of edges
*/
public final Collection findPinEdges (P pin, boolean allowOutputEdges, boolean allowInputEdges) {
assert isPin (pin) : "Pin " + pin + " is not in the scene";
ArrayList list = new ArrayList ();
if (allowInputEdges)
list.addAll (pinInputEdges.get (pin));
if (allowOutputEdges)
list.addAll (pinOutputEdges.get (pin));
return list;
}
/**
* Returns a collection of edges that are between a source and a target pin.
* @param sourcePin the source pin
* @param targetPin the target pin
* @return the collection of edges
*/
public final Collection findEdgesBetween (P sourcePin, P targetPin) {
assert isPin (sourcePin) : "Source pin " + sourcePin + " is not in the scene";
assert isPin (targetPin) : "Target pin " + targetPin + " is not in the scene";
HashSet list = new HashSet ();
List inputEdges = pinInputEdges.get (targetPin);
List outputEdges = pinOutputEdges.get (sourcePin);
for (E edge : inputEdges)
if (outputEdges.contains (edge))
list.add (edge);
return list;
}
/**
* Checks whether an object is registered as a node in the graph model.
* @param object the object; must not be a Widget
* @return true, if the object is registered as a node
*/
public boolean isNode (Object object) {
assert ! (object instanceof Widget) : "Use findObject method for getting an object assigned to a specific Widget"; // NOI18N
return nodes.contains (object);
}
/**
* Checks whether an object is registered as an edge in the graph model.
* @param object the object; must not be a Widget
* @return true, if the object is registered as a edge
*/
public boolean isEdge (Object object) {
assert ! (object instanceof Widget) : "Use findObject method for getting an object assigned to a specific Widget"; // NOI18N
return edges.contains (object);
}
/**
* Checks whether an object is registered as a pin in the graph model.
* @param object the object; must not be a Widget
* @return true, if the object is registered as a pin
*/
public boolean isPin (Object object) {
assert ! (object instanceof Widget) : "Use findObject method for getting an object assigned to a specific Widget"; // NOI18N
return pins.contains (object);
}
/**
* Called by the addNode method to notify that a node is added into the graph model.
* @param node the added node
* @param widget the widget created by the attachNodeWidget method as a visual representation of the node
*/
protected void notifyNodeAdded (N node, Widget widget) {
}
/**
* Called by the addEdge method to notify that an edge is added into the graph model.
* @param edge the added node
* @param widget the widget created by the attachEdgeWidget method as a visual representation of the edge
*/
protected void notifyEdgeAdded (E edge, Widget widget) {
}
/**
* Called by the addPin method to notify that a pin is added into the graph model.
* @param node the node where the pin is assigned to
* @param pin the added pin
* @param widget the widget created by the attachPinWidget method as a visual representation of the pin
*/
protected void notifyPinAdded (N node, P pin, Widget widget) {
}
/**
* Called by the removeNode method to notify that a node is removed from the graph model.
* The default implementation removes the node widget from its parent widget.
* @param node the removed node
* @param widget the removed node widget; null if the node is non-visual
*/
protected void detachNodeWidget (N node, Widget widget) {
if (widget != null)
widget.removeFromParent ();
}
/**
* Called by the removeEdge method to notify that an edge is removed from the graph model.
* The default implementation removes the edge widget from its parent widget.
* @param edge the removed edge
* @param widget the removed edge widget; null if the edge is non-visual
*/
protected void detachEdgeWidget (E edge, Widget widget) {
if (widget != null)
widget.removeFromParent ();
}
/**
* Called by the removePin method to notify that a pin is removed from the graph model.
* The default implementation removes the pin widget from its parent widget.
* @param pin the removed pin
* @param widget the removed pin widget; null if the pin is non-visual
*/
protected void detachPinWidget (P pin, Widget widget) {
if (widget != null)
widget.removeFromParent ();
}
/**
* Called by the addNode method before the node is registered to acquire a widget that is going to represent the node in the scene.
* The method is responsible for creating the widget, adding it into the scene and returning it from the method.
* @param node the node that is going to be added
* @return the widget representing the node; null, if the node is non-visual
*/
protected abstract Widget attachNodeWidget (N node);
/**
* Called by the addEdge method before the edge is registered to acquire a widget that is going to represent the edge in the scene.
* The method is responsible for creating the widget, adding it into the scene and returning it from the method.
* @param edge the edge that is going to be added
* @return the widget representing the edge; null, if the edge is non-visual
*/
protected abstract Widget attachEdgeWidget (E edge);
/**
* Called by the addPin method before the pin is registered to acquire a widget that is going to represent the pin in the scene.
* The method is responsible for creating the widget, adding it into the scene and returning it from the method.
* @param node the node where the pin is assigned to
* @param pin the pin that is going to be added
* @return the widget representing the pin; null, if the pin is non-visual
*/
protected abstract Widget attachPinWidget (N node, P pin);
/**
* Called by the setEdgeSource method to notify about the changing the edge source in the graph model.
* The method is responsible for attaching a new source pin to the edge in the visual representation.
*
* Usually it is implemented as:
*
* Widget sourcePinWidget = findWidget (sourcePin);
* Anchor sourceAnchor = AnchorFactory.createRectangularAnchor (sourcePinWidget)
* ConnectionWidget edgeWidget = (ConnectionWidget) findWidget (edge);
* edgeWidget.setSourceAnchor (sourceAnchor);
*
* @param edge the edge which source is changed in graph model
* @param oldSourcePin the old source pin
* @param sourcePin the new source pin
*/
protected abstract void attachEdgeSourceAnchor (E edge, P oldSourcePin, P sourcePin);
/**
* Called by the setEdgeTarget method to notify about the changing the edge target in the graph model.
* The method is responsible for attaching a new target pin to the edge in the visual representation.
*
* Usually it is implemented as:
*
* Widget targetPinWidget = findWidget (targetPin);
* Anchor targetAnchor = AnchorFactory.createRectangularAnchor (targetPinWidget)
* ConnectionWidget edgeWidget = (ConnectionWidget) findWidget (edge);
* edgeWidget.setTargetAnchor (targetAnchor);
*
* @param edge the edge which target is changed in graph model
* @param oldTargetPin the old target pin
* @param targetPin the new target pin
*/
protected abstract void attachEdgeTargetAnchor (E edge, P oldTargetPin, P targetPin);
/**
* This class is a particular GraphPinScene where nodes, edges and pins are represented with String class.
*/
public static abstract class StringGraph extends GraphPinScene {
}
}