retval = ErrorEval.VALUE_INVALID;
break;
case 2:
ValueEval ve = singleOperandEvaluate(operands[0], srcCellRow, srcCellCol);
if (ve instanceof StringValueEval) {
StringValueEval sve = (StringValueEval) ve;
s0 = sve.getStringValue();
}
else if (ve instanceof BlankEval) {
s0 = StringEval.EMPTY_INSTANCE.getStringValue();
}
else {
retval = ErrorEval.VALUE_INVALID;
break;
}
if (retval == null) {
ve = singleOperandEvaluate(operands[1], srcCellRow, srcCellCol);
if (ve instanceof StringValueEval) {
StringValueEval sve = (StringValueEval) ve;
s1 = sve.getStringValue();
}
else if (ve instanceof BlankEval) {
s1 = StringEval.EMPTY_INSTANCE.getStringValue();
}
else {