question: private TypedClassOperation instantiateOperationTypes ( TypedClassOperation operation ) { List < TypeVariable > typeParameters = operation . getTypeParameters ( ) ; if ( typeParameters . isEmpty ( ) ) { return operation ; } Substitution < ReferenceType > substitution = selectSubstitution ( typeParameters ) ; if ( substitution == null ) { return null ; } return operation . apply ( substitution ) ; }
target:  Selects an instantiation of the generic types of an operation, and returns a new operation with the types instantiated.