find
Helper to simplify finding a single output StateAndRef matching a Predicate.
Return
the single StateAndRef item matching the predicate.
Parameters
clazz
The class type used for filtering via an Class.isInstance check. Clazz must be an extension of ContractState.
predicate
A filtering function taking a state of type T and returning true if this is the desired item. The class filtering is applied before the predicate.
Throws
if no item, or multiple items are found matching the requirements.