/**
* returns the OperationEval concrete impl instance corresponding
* to the supplied operationPtg
*/
public static ValueEval Evaluate(OperationPtg ptg, ValueEval[] args,
OperationEvaluationContext ec)
{
if (ptg == null)
{
throw new ArgumentException("ptg must not be null");
}
Chama.Utils.NPOI.SS.Formula.Functions.Function result = _instancesByPtgClass[ptg] as Chama.Utils.NPOI.SS.Formula.Functions.Function;
if (result != null)
{
return(result.Evaluate(args, ec.RowIndex, (short)ec.ColumnIndex));
}
if (ptg is AbstractFunctionPtg)
{
AbstractFunctionPtg fptg = (AbstractFunctionPtg)ptg;
int functionIndex = fptg.GetFunctionIndex();
switch (functionIndex)
{
case Chama.Utils.NPOI.SS.Formula.Function.FunctionMetadataRegistry.FUNCTION_INDEX_INDIRECT:
return(Indirect.instance.Evaluate(args, ec));
case Chama.Utils.NPOI.SS.Formula.Function.FunctionMetadataRegistry.FUNCTION_INDEX_EXTERNAL:
return(UserDefinedFunction.instance.Evaluate(args, ec));
}
return(FunctionEval.GetBasicFunction(functionIndex).Evaluate(args, ec.RowIndex, ec.ColumnIndex));
}
throw new Exception("Unexpected operation ptg class (" + ptg.GetType().Name + ")");
}
private static void Add(Hashtable m, OperationPtg ptgKey,
Chama.Utils.NPOI.SS.Formula.Functions.Function instance)
{
// make sure ptg has single private constructor because map lookups assume singleton keys
ConstructorInfo[] cc = ptgKey.GetType().GetConstructors();
if (cc.Length > 1 || (cc.Length > 0 && !cc[0].IsPrivate))
{
throw new Exception("Failed to verify instance ("
+ ptgKey.GetType().Name + ") is a singleton.");
}
m[ptgKey] = instance;
}