org.apache.cayenne.graph
Interface GraphDiff

All Superinterfaces:
Serializable
All Known Implementing Classes:
ArcCreateOperation, ArcDeleteOperation, CompoundDiff, NodeCreateOperation, NodeDeleteOperation, NodeDiff, NodeIdChangeOperation, NodePropertyChangeOperation

public interface GraphDiff
extends Serializable

Represents a change in an object graph. This can be a simple change (like a node property update) or a composite change that consists of a number of smaller changes.

Since:
1.2

Method Summary
 void apply(GraphChangeHandler handler)
          Calls appropriate methods on the handler to "replay" this change.
 boolean isNoop()
          Returns true if this diff is simply a placeholder and does not perform any actual operation.
 void undo(GraphChangeHandler handler)
          Calls appropriate methods on the handler to revert this change.
 

Method Detail

isNoop

boolean isNoop()
Returns true if this diff is simply a placeholder and does not perform any actual operation.


apply

void apply(GraphChangeHandler handler)
Calls appropriate methods on the handler to "replay" this change.


undo

void undo(GraphChangeHandler handler)
Calls appropriate methods on the handler to revert this change.



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