Class GraphMap

java.lang.Object

org.apache.cayenne.graph.GraphMap

All Implemented Interfaces:

GraphChangeHandler, GraphManager

public class GraphMap
extends Object
implements GraphManager

A base implementation of GraphManager that stores graph nodes keyed by their ids.

Tracking Object Changes

Registered objects may choose to notify GraphMap of their changes by using callback methods defined in GraphChangeHandler interface. GraphMap itself implements as noops, leaving it up to subclasses to handle object updates.

Since:

1.2

Field Summary

Fields

Modifier and Type	Field	Description
protected Map<Object,Object>	nodes

Constructor Summary

Constructors

Constructor	Description
GraphMap()	Creates a new GraphMap.

Method Summary

Modifier and Type	Method	Description
Object	getNode(Object nodeId)	Returns a graph node given an id.
Collection<Object>	registeredNodes()	Returns an immutable collection of registered nodes.
void	registerNode(Object nodeId, Object nodeObject)	"Registers" a graph node, usually storing the node in some internal map using its id as a key.
Object	unregisterNode(Object nodeId)	"Unregisters" a graph node, forgetting any information associated with nodeId.

Methods inherited from class Object

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

Methods inherited from interface GraphChangeHandler

arcCreated, arcDeleted, nodeCreated, nodeIdChanged, nodePropertyChanged, nodeRemoved

Modifier and Type	Method	Description
default void	arcCreated(Object nodeId, Object targetNodeId, ArcId arcId)	Notifies implementing object that a new arc was created between two nodes.
default void	arcDeleted(Object nodeId, Object targetNodeId, ArcId arcId)	Notifies implementing object that an arc between two nodes was deleted.
default void	nodeCreated(Object nodeId)	Notifies implementing object that a new node was created in the graph.
default void	nodeIdChanged(Object nodeId, Object newId)	Notifies implementing object that a node was assigned a new id.
default void	nodePropertyChanged(Object nodeId, String property, Object oldValue, Object newValue)	Notifies implementing object that a node's property was modified.
default void	nodeRemoved(Object nodeId)	Notifies implementing object that a node was removed from the graph.

Field Details

nodes

protected Map<Object,Object> nodes

Constructor Details

GraphMap

public GraphMap()

Creates a new GraphMap.

Method Details

registeredNodes

public Collection<Object> registeredNodes()

Returns an immutable collection of registered nodes.

Specified by:

registeredNodes in interface GraphManager

getNode

public Object getNode(Object nodeId)

Description copied from interface: GraphManager

Returns a graph node given an id.

Specified by:

getNode in interface GraphManager

registerNode

public void registerNode(Object nodeId,
 Object nodeObject)

Description copied from interface: GraphManager

"Registers" a graph node, usually storing the node in some internal map using its id as a key.

Specified by:

registerNode in interface GraphManager

unregisterNode

public Object unregisterNode(Object nodeId)

Description copied from interface: GraphManager

"Unregisters" a graph node, forgetting any information associated with nodeId.

Specified by:

unregisterNode in interface GraphManager