TableHelper.cpp

#include "stdafx.h"
#include "TableHelper.h"

// **************************************************
//		Cast()
// **************************************************
CTableClass* TableHelper::Cast(CComPtr<ITable>& table)
{
	return (CTableClass*)&(*table);
}

// **************************************************
//		GetNumRows()
// **************************************************
long TableHelper::GetNumRows(ITable* table)
{
	if (!table) return 0;
	long numRows;
	table->get_NumRows(&numRows);
	return numRows;
}

// **************************************************
//		GetNumFields()
// **************************************************
long TableHelper::GetNumFields(ITable* table)
{
	if (!table) return 0;
	long numFields;
	table->get_NumFields(&numFields);
	return numFields;
}

// **************************************************
//		SetFieldValues()
// **************************************************
void TableHelper::SetFieldValues(ITable* table, int rowIndex, CustomExpression& expr )
{
	if (!table) return;
	
	for (long j = 0; j< expr.get_NumFields(); j++) 
	{
		CComVariant var;
		int fieldIndex = expr.get_FieldIndex(j);
		table->get_CellValue(fieldIndex, rowIndex, &var);
		switch (var.vt)
		{
			case VT_BSTR: expr.put_FieldValue(j, var.bstrVal); break;
			case VT_I4:	  expr.put_FieldValue(j, (double)var.lVal); break;
			case VT_R8:	  expr.put_FieldValue(j, (double)var.dblVal); break;
		}
	}

	// TODO: don't set shape, if the expression doesn't contain geometry function
	IShapefile* sf = ((CTableClass*)table)->GetParentShapefile();	 // doesn't add reference
	if (sf)
	{
		CComPtr<IShape> shp = NULL;
		sf->get_Shape(rowIndex, &shp);
		if (shp)
		{
			expr.put_Shape(shp);
		}
	}
}