public TableCriteriaForMappingByValue(TableMappingByValue <TRow, TSearch, TColumn, TCriteria> mapping, SearchCriteria <TColumn> criteria)
{
_mapping = mapping;
_metaData = _mapping.MetaData;
_criteria = criteria;
Score = GetScore(_metaData, criteria);
}
public override TableCriteriaScore GetScore <TRow>(TableMappingMetaData <TRow, TColumn> metaData)
{
if (SearchValues.Length == 0)
{
return(new TableCriteriaScore(1, false));
}
return(new TableCriteriaScore(SearchValues.Length / (float)metaData.PossibleValues.Length, true));
}
public override TableCriteriaScore GetScore <TRow>(TableMappingMetaData <TRow, TColumn> metaData)
{
var resultRange = new BinarySearchTable <TColumn>(metaData.PossibleValues).ReduceByRange(x => x, Start, End, metaData.Comparer);
var nbResults = resultRange.TotalCount;
if (nbResults == 0)
{
return(TableCriteriaScore.Impossible);
}
return(new TableCriteriaScore((float)nbResults / metaData.PossibleValues.Length, PreserveSearchability));
}
public override SearchCriteria <TColumn> Optimize <TRow>(TableMappingMetaData <TRow, TColumn> metaData)
{
switch (SearchValues.Length)
{
case 0: return(null);
case 1: return(this);
}
// Try to remove duplicate search values
return(ByValues(SearchValues.Distinct(metaData.EqualityComparer).ToArray()));
}
private static TableCriteriaScore GetScore(TableMappingMetaData <TRow, TColumn> metaData, SearchCriteria <TColumn> criteria)
{
// There are no values, will always return an empty set
if (metaData.PossibleValues.Length == 0)
{
return(TableCriteriaScore.Impossible);
}
// No criteria or criteria contains no value, we ignore the criteria
if (criteria == null)
{
return(TableCriteriaScore.NotOptimizable);
}
return(criteria.GetScore(metaData));
}
public override SearchCriteria <TColumn> Optimize <TRow>(TableMappingMetaData <TRow, TColumn> metaData)
{
if (metaData.Comparer.Compare(Start, End) == 0)
{
return(ByValues(Start));
}
var resultRange = new BinarySearchTable <TColumn>(metaData.PossibleValues).ReduceByRange(x => x, Start, End, metaData.Comparer);
var nbResults = resultRange.TotalCount;
if (nbResults <= 1)
{
return(ByValues(resultRange.Materialize()));
}
if (nbResults < 10)
{
return(new SearchCriteriaByRange <TColumn>(Start, End, true));
}
return(this);
}
public override BinarySearchTable <TRow> Reduce <TRow>(BinarySearchTable <TRow> rows, TableMappingMetaData <TRow, TColumn> metaData)
{
return(rows.ReduceByValues(metaData.GetTargetValue, SearchValues, metaData.Comparer));
}
public override BinarySearchTable <TRow> Reduce <TRow>(BinarySearchTable <TRow> rows, TableMappingMetaData <TRow, TColumn> metaData)
{
return(rows.ReduceByRange(metaData.GetTargetValue, Start, End, metaData.Comparer, PreserveSearchability));
}
public override TableCriteriaScore GetScore <TRow>(TableMappingMetaData <TRow, TColumn> metaData)
{
return(TableCriteriaScore.NotOptimizable);
}
public override SearchCriteria <TColumn> Optimize <TRow>(TableMappingMetaData <TRow, TColumn> metaData)
{
return(this);
}
public override BinarySearchTable <TRow> Reduce <TRow>(BinarySearchTable <TRow> rows, TableMappingMetaData <TRow, TColumn> metaData)
{
return(null);
}