com.google.appengine.api.datastore
Interface CallbackContext<T>
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- 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..
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method and Description T
getCurrentElement()
int
getCurrentIndex()
Transaction
getCurrentTransaction()
java.util.List<T>
getElements()
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Method Detail
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getElements
java.util.List<T> getElements()
- Returns:
- An unmodifiable view of the elements involved in the operation that triggered the callback..
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getCurrentTransaction
Transaction getCurrentTransaction()
- Returns:
- The current transaction, or
null
if there is no current transaction.
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getCurrentIndex
int getCurrentIndex()
- Returns:
- The index in the result of
getElements()
of the element for which the callback has been invoked.
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getCurrentElement
T getCurrentElement()
- Returns:
- The element for which the callback has been invoked. Shortcut for
getElements().getCurrentIndex()
.
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