Package org.apache.cayenne.graph

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

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

Field Detail

nodes

protected Map<Object,Object> nodes

Constructor Detail

GraphMap

public GraphMap()

Creates a new GraphMap.

Method Detail

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

arcCreated

public void arcCreated(Object nodeId,
                       Object targetNodeId,
                       ArcId arcId)

Description copied from interface: GraphChangeHandler

Notifies implementing object that a new arc was created between two nodes.

Specified by:

arcCreated in interface GraphChangeHandler

arcDeleted

public void arcDeleted(Object nodeId,
                       Object targetNodeId,
                       ArcId arcId)

Description copied from interface: GraphChangeHandler

Notifies implementing object that an arc between two nodes was deleted.

Specified by:

arcDeleted in interface GraphChangeHandler

nodeCreated

public void nodeCreated(Object nodeId)

Description copied from interface: GraphChangeHandler

Notifies implementing object that a new node was created in the graph.

Specified by:

nodeCreated in interface GraphChangeHandler

nodeRemoved

public void nodeRemoved(Object nodeId)

Description copied from interface: GraphChangeHandler

Notifies implementing object that a node was removed from the graph.

Specified by:

nodeRemoved in interface GraphChangeHandler

nodeIdChanged

public void nodeIdChanged(Object nodeId,
                          Object newId)

Description copied from interface: GraphChangeHandler

Notifies implementing object that a node was assigned a new id.

Specified by:

nodeIdChanged in interface GraphChangeHandler

nodePropertyChanged

public void nodePropertyChanged(Object nodeId,
                                String property,
                                Object oldValue,
                                Object newValue)

Description copied from interface: GraphChangeHandler

Notifies implementing object that a node's property was modified.

Specified by:

nodePropertyChanged in interface GraphChangeHandler