code: public boolean isValid(CobolContext cobolContext, byte[] hostData, int start) {
          return isValid(javaClass, cobolContext, hostData, start);
      }
docs: Check if a byte array contains valid mainframe data for this type
  characteristics.
  
  @param cobolContext host COBOL configuration parameters
  @param hostData the byte array containing mainframe data
  @param start the start position for the expected type in the byte array
  @return true if the byte array contains a valid type