ValueEval retval = null;
String s = null;
switch (operands.length) {
default:
retval = ErrorEval.VALUE_INVALID;
break;
case 1:
ValueEval ve = singleOperandEvaluate(operands[0], srcCellRow, srcCellCol);
if (ve instanceof StringValueEval) {
StringValueEval sve = (StringValueEval) ve;
s = sve.getStringValue();
}
else if (ve instanceof BlankEval) {}
else {
retval = ErrorEval.VALUE_INVALID;
break;
}
}
if (retval == null) {
s = (s == null) ? EMPTY_STRING : s;
retval = new StringEval(s.toLowerCase());
}
return retval;
