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

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `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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