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## org.apache.cayenne.graph
Interface GraphDiff

All Superinterfaces:
  java.io.Serializable

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

    public interface GraphDiff

extends java.io.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
Author:
  Andrus Adamchik

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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