public interface PreQuery implements AnnotationIdentifies a callback method to be invoked before a Query for any of the specified kinds
is executed against the datastore. If #kinds() is not provided the callback will execute
for queries against all kinds, including kind-less queries. Methods with this annotation must
return void, must accept a single argument of type PreQueryContext, must not
throw any checked exceptions, must not be static, and must belong to a class with a no-arg
constructor. Neither the method nor the no-arg constructor of the class to which it belongs are
required to be public. Methods with this annotation are free to throw any unchecked exception
they like. Throwing an unchecked exception will prevent callbacks that have not yet been executed
from running, and the exception will propagate to the code that invoked the datastore operation
that resulted in the invocation of the callback. Throwing an unchecked exception from a callback
will prevent the datastore operation from executing.
Implements
AnnotationMethods
kinds()
public abstract String[] kinds()The kinds to which this callback applies. The default value is an empty array, which indicates that the callback should run for all kinds.
| Returns | |
|---|---|
| Type | Description |
String[] |
The kinds to which this callback applies. |