private static void Add(Hashtable m, OperationPtg ptgKey,
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;
}
/**
* returns the OperationEval concrete impl instance corresponding
* to the supplied operationPtg
*/
public static OperationEval Create(OperationPtg ptg)
{
if (ptg == null)
{
throw new ArgumentException("ptg must not be null");
}
Type ptgClass = ptg.GetType();
ConstructorInfo constructor = (ConstructorInfo)_constructorsByPtgClass[ptgClass];
if (constructor == null)
{
if (ptgClass == typeof(ExpPtg))
{
// ExpPtg Is used for array formulas and shared formulas.
// it Is currently Unsupported, and may not even Get implemented here
throw new Exception("ExpPtg currently not supported");
}
throw new Exception("Unexpected operation ptg class (" + ptgClass.Name + ")");
}
Object result;
Object[] initargs = { ptg };
try
{
result = constructor.Invoke(initargs);
}
catch (Exception)
{
throw;
}
return (OperationEval)result;
}
/**
* 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");
}
NPOI.SS.Formula.Functions.Function result = _instancesByPtgClass[ptg] as 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.FunctionIndex;
switch (functionIndex)
{
case NPOI.SS.Formula.Function.FunctionMetadataRegistry.FUNCTION_INDEX_INDIRECT:
return Indirect.instance.Evaluate(args, ec);
case 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 + ")");
}