not
Check that the object is not null, otherwise throw a GraphPreconditionFailure with the given message.
Parameters
o
The object o check for nullness.
message
A description of the failure.
Throws
If the object is null.
Check that the object is not null, otherwise throw a GraphPreconditionFailure with the given message.
The object o check for nullness.
A description of the failure.
If the object is null.