/// <summary>
/// Build a set of rows from data in the buffer
/// </summary>
public override void BuildDataFromOtherRetrievedData(
QueryEngine qe,
int ti,
List <object[]> results,
int firstResult,
int resultCount)
{
// This routine takes a set of results in the buffer, computes the calculated field value
// and stores the results back in the buffer. For a calc field derived from a single column
// the process is simple; however, for two column calculations there are two cases to consider.
// 1. If no values then nothing to compute.
// 2. If both values are present in the buffer row then just use them.
// 3. If a single value is present then pick up the most recent other value that
// exists for the same key.
// Note that if the query only retrieves one of the two fields the the other field
// will be retrieved into the calc field buffer.
QueryColumn qc;
MetaColumn mc;
CalcFieldColumn cfc, cfc2;
int voiCfKey, voiCf, voi;
object v, v1, v2, vn;
object[] vo, mergedVo;
const int keyOffset = 1;
throw new NotImplementedException();
#if false
Query q = qe.Query;
CalcFieldMetaTable cfMt = GetCalcFieldMetaTable(q.Tables[ti].MetaTable);
CalcField cf = cfMt.CalcField;
// Setup
if (resultCount <= 0)
{
return;
}
if (SelectList.Count <= 1)
{
return; // just return if only key selected
}
voiCfKey = Qt.KeyQueryColumn.VoPosition; // calc field key value buffer index
voiCf = Qt.GetQueryColumnByNameWithException("CALC_FIELD").VoPosition; // calculated value buffer index
mergedVo = new object[results[0].Length]; // merged vo containing latest values for each column
// Process each result row
for (int ri = firstResult; ri < firstResult + resultCount; ri++) // result loop
{
vo = results[ri];
if (vo[0] == null)
{
continue;
}
if (mergedVo[0] == null || Lex.Ne(vo[0].ToString(), mergedVo[0].ToString()))
{ // if new key init voVals
Array.Clear(mergedVo, 0, mergedVo.Length);
mergedVo[0] = vo[0];
}
int nonNullCount = 0;
int nullCount = 0;
QueryColumn[] colMap = _dataMap.InputColMap;
for (int mi = 0; mi < colMap.Length; mi++)
{
if (colMap[mi] == null)
{
continue; //
}
voi = colMap[mi].VoPosition;
v = vo[voi];
if (!NullValue.IsNull(v))
{
mergedVo[voi] = v;
nonNullCount++;
}
else
{
nullCount++;
}
}
if (nonNullCount == 0)
{
continue; // if all inputs are null then all done (assume all outputs are null also)
}
vo[voiCfKey] = vo[0]; // copy key value
QueryTableData qtd = qe.Qtd[ti];
// Pick up each retrieved value in the from other data fields
for (int cfci = 0; cfci < qtd.SelectedColumns.Count; cfci++) // columns to retrieve/calculate loop
{
qc = qtd.SelectedColumns[cfci];
mc = qc.MetaColumn;
voi = qc.VoPosition;
bool calcFieldCol = Lex.Eq(mc.Name, "CALC_FIELD");
bool selectedCol = !calcFieldCol;
// Input value column
if (selectedCol) // retrieved input value
{
QueryColumn cmi = _dataMap.SelectedColMap[cfci];
if (cmi != null && cmi.VoPosition > 0)
{
v = mergedVo[cmi.VoPosition];
if (mc.DataType == MetaColumnType.Image) // convert to proper image reference
{
MetaTable sourceMt = cmi.QueryTable.MetaTable;
GenericMetaBroker gmb = QueryEngine.GetGlobalBroker(cmi.QueryTable.MetaTable);
v = gmb.ConvertValueToImageReference(v);
}
vo[voi] = v;
}
}
// Calculate the CF value
else
{
cfc = cf.CfCols[0];
vn = vo[voiCf]; // get possible single retrieved value
vo[voiCf] = null; // clear calc value (may hold one of two values)
v = mergedVo[colMap[0].VoPosition]; // get first value
if (NullValue.IsNull(v))
{
continue; // if null then result must be null
}
v = ApplyFunction(cfc, v);
for (int mi = 1; mi < colMap.Length; mi++) // combine with
{
v1 = v; // reference previous value
if (colMap[mi] == null)
{
continue;
}
cfc2 = cf.CfCols[mi];
voi = colMap[mi].VoPosition;
v2 = mergedVo[voi];
v2 = ApplyFunction(cfc2, v2);
v = CalculateValue(cf, v1, cfc2, v2);
if (v == null)
{
break;
}
}
v = ApplyClassification(cf, v);
vo[voiCf] = v; // store calculated value
}
} // column loop
vo = vo; // debug to check row loop at end
} // row loop
return;
#endif
}
