static Optional handlerTypeArgument()

in invoker/core/src/main/java/com/google/cloud/functions/invoker/TypedFunctionExecutor.java [87:93]

• 7 lines of code
• 2 McCabe index (conditional complexity)

  static Optional<Type> handlerTypeArgument(Class<? extends TypedFunction<?, ?>> functionClass) {
    return Arrays.stream(functionClass.getMethods())
        .filter(method -> method.getName().equals(APPLY_METHOD) && method.getParameterCount() == 1)
        .map(method -> method.getGenericParameterTypes()[0])
        .filter(type -> type != Object.class)
        .findFirst();
  }