@Override
ExpectedKeyOutput toUpperCase(final Locale locale) {
if (Constants.isLetterCode(mCode)) {
final String codeString = StringUtils.newSingleCodePointString(mCode);
// A letter may have an upper case counterpart that consists of multiple code
// points, for instance the upper case of "ß" is "SS".
return newInstance(codeString.toUpperCase(locale));
}
// A special negative value has no upper case.
return this;
}
@Override
public String toString() {
return Constants.isLetterCode(mCode)
? StringUtils.newSingleCodePointString(mCode)
: Constants.printableCode(mCode);
}