code: public static String determineMutatorName(@Nonnull final String fieldName) {
  		Check.notEmpty(fieldName, "fieldName");
  		final Matcher m = PATTERN.matcher(fieldName);
  		Check.stateIsTrue(m.find(), "passed field name '%s' is not applicable", fieldName);
  		final String name = m.group();
  		return METHOD_SET_PREFIX + name.substring(0, 1).toUpperCase() + name.substring(1);
  	}
docs: Determines the mutator method name based on a field name.
  
  @param fieldName
  a field name
  @return the resulting method name