code: public java.util.List<String> getPermittedFileTypes() {
          if (permittedFileTypes == null) {
              permittedFileTypes = new com.amazonaws.internal.SdkInternalList<String>();
          }
          return permittedFileTypes;
      }
docs: <p>
  The permitted file types allowed for a solution stack.
  </p>
  
  @return The permitted file types allowed for a solution stack.