/**
* Returns one column from an <c>AreaEval</c>
*
* @(#VALUE!) if colIndex Is negative, (#REF!) if colIndex Is too high
*/
private ValueVector CreateResultColumnVector(AreaEval tableArray, int rowIndex)
{
if (rowIndex >= tableArray.Height)
{
throw EvaluationException.InvalidRef();
}
return(LookupUtils.CreateRowVector(tableArray, rowIndex));
}
public ValueEval Evaluate(ValueEval[] args, int srcCellRow, int srcCellCol)
{
ValueEval arg3 = null;
switch (args.Length)
{
case 4:
arg3 = args[3]; // important: assumed array element Is never null
break;
case 3:
break;
default:
// wrong number of arguments
return(ErrorEval.VALUE_INVALID);
}
try
{
// Evaluation order:
// arg0 lookup_value, arg1 table_array, arg3 range_lookup, Find lookup value, arg2 row_index, fetch result
ValueEval lookupValue = OperandResolver.GetSingleValue(args[0], srcCellRow, srcCellCol);
AreaEval tableArray = LookupUtils.ResolveTableArrayArg(args[1]);
bool IsRangeLookup = LookupUtils.ResolveRangeLookupArg(arg3, srcCellRow, srcCellCol);
int colIndex = LookupUtils.LookupIndexOfValue(lookupValue, LookupUtils.CreateRowVector(tableArray, 0), IsRangeLookup);
int rowIndex = LookupUtils.ResolveRowOrColIndexArg(args[2], srcCellRow, srcCellCol);
ValueVector resultCol = CreateResultColumnVector(tableArray, rowIndex);
return(resultCol.GetItem(colIndex));
}
catch (EvaluationException e)
{
return(e.GetErrorEval());
}
}