Package org.apache.cayenne.graph

Class ChildDiffLoader

java.lang.Object

org.apache.cayenne.graph.ChildDiffLoader

All Implemented Interfaces:

GraphChangeHandler

public class ChildDiffLoader
extends Object
implements GraphChangeHandler

A GraphChangeHandler that loads child ObjectContext diffs into a parent ObjectContext. Graph node ids are expected to be ObjectIds. This class is made public since 3.0 to be used in ObjectContext synchronizing

Since:

1.2

Field Summary

Fields

Modifier and Type	Field	Description
protected ObjectContext	context

Constructor Summary

Constructors

Constructor	Description
ChildDiffLoader(ObjectContext context)

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.
protected Persistent	findObject(Object nodeId)
protected Persistent	findObjectInCollection(Object nodeId, Object toManyHolder)
static boolean	isProcessingChildDiff()	Returns whether child diff processing is in progress.
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.
static void	setExternalChange(Boolean flag)	Sets whether child diff processing is in progress.

Methods inherited from class java.lang.Object

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

Field Detail

context

protected ObjectContext context

Constructor Detail

ChildDiffLoader

public ChildDiffLoader(ObjectContext context)

Method Detail

isProcessingChildDiff

public static boolean isProcessingChildDiff()

Returns whether child diff processing is in progress.

Since:

3.0

setExternalChange

public static void setExternalChange(Boolean flag)

Sets whether child diff processing is in progress.

Since:

3.0

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

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

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

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

findObject

protected Persistent findObject(Object nodeId)

findObjectInCollection

protected Persistent findObjectInCollection(Object nodeId,
                                            Object toManyHolder)