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## 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
`protected ObjectContext` | `context`

Constructor Summary
`ChildDiffLoader(ObjectContext context)`

Method Summary
`void` | `arcCreated(Object nodeId, Object targetNodeId, Object arcId)` Notifies implementing object that a new arc was created between two nodes.
`void` | `arcDeleted(Object nodeId, Object targetNodeId, Object 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,
                           Object 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,
                           Object 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)

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