CallbackContext (AppEngine :: appengine-apis 2.0.14 API)

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	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.
`List<T>`	`getElements()`	Returns an unmodifiable view of the elements involved in the operation that triggered the callback..

- Method Detail
  - getElements
```
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().