code: public java.util.List<String> getStepStates() {
          if (stepStates == null) {
              stepStates = new com.amazonaws.internal.SdkInternalList<String>();
          }
          return stepStates;
      }
docs: <p>
  The filter to limit the step list based on certain states.
  </p>
  
  @return The filter to limit the step list based on certain states.
  @see StepState