public final class PreGetContext
extends java.lang.Object
CallbackContext
implementation that is specific to
intercepted get() operations. Methods annotated with that receive
instances of this class may modify the result of the get() operation by
calling
setResultForCurrentElement(Entity)
. Keys that receive
results via this method will not be fetched from the datastore. This is an
effective way to inject cached results.
Modifier and Type | Method and Description |
---|---|
T
|
getCurrentElement
()
|
int
|
getCurrentIndex
()
|
Transaction
|
getCurrentTransaction
()
|
java.util.List<T>
|
getElements
()
|
void
|
setResultForCurrentElement
(
Entity
entity)
Set the
Entity
that will be associated with the
Key
returned by
getCurrentElement()
in the result of the get()
operation.
|
public void setResultForCurrentElement(Entity entity)
Entity
that will be associated with the
Key
returned by
getCurrentElement()
in the result of the get()
operation. This will prevent the get() operation from fetching the
Entity from the datastore. This is an effective way to inject cached
results.
entity
- The entity to provide as the result for the current element.
java.lang.IllegalArgumentException
- If the key of the provided entity is not
equal to the key returned by
getCurrentElement()
.
public java.util.List<T> getElements()
getElements
in interface
CallbackContext
<T>
public Transaction getCurrentTransaction()
getCurrentTransaction
in interface
CallbackContext
<T>
null
if there is no current
transaction.
public int getCurrentIndex()
getCurrentIndex
in interface
CallbackContext
<T>
CallbackContext.getElements()
of the element
for which the callback has been invoked.
public T getCurrentElement()
getCurrentElement
in interface
CallbackContext
<T>
getElements().getCurrentIndex()
.