com.google.appengine.api.datastore

## Interface CallbackContext<T>

- Type Parameters:
    `T` - the type of element that the callback is acting on.
  All Known Implementing Classes:
    DeleteContext, PostLoadContext, PreGetContext, PreQueryContext, PutContext

      public interface CallbackContext<T>

  Describes the context in which a callback runs. The context has access to the current transaction (if any), the element that the callback is operating on (eg the Entity being put or the Key being deleted), as well as all elements being operated on in the operation that triggered the callback..

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `T` | `getCurrentElement()` Returns the element for which the callback has been invoked.
    `int` | `getCurrentIndex()` Returns the index in the result of `getElements()` of the element for which the callback has been invoked.
    `Transaction` | `getCurrentTransaction()` Returns the current transaction, or `null` if there is no current transaction.
    `java.util.List<T>` | `getElements()` Returns an unmodifiable view of the elements involved in the operation that triggered the callback..

- - ### Method Detail

    - #### getElements

          java.util.List<T> getElements()

      Returns an unmodifiable view of the elements involved in the operation that triggered the callback..

    - #### getCurrentTransaction

          Transaction getCurrentTransaction()

      Returns the current transaction, or `null` if there is no current transaction.

    - #### getCurrentIndex

          int getCurrentIndex()

      Returns the index in the result of `getElements()` of the element for which the callback has been invoked.

    - #### getCurrentElement

          T getCurrentElement()

      Returns the element for which the callback has been invoked. Shortcut for `getElements().getCurrentIndex()`.