DataViewRow ISchemaBoundRowMapper.GetRow(DataViewRow input, IEnumerable <DataViewSchema.Column> activeColumns)
{
Contracts.AssertValue(input);
Contracts.AssertValue(activeColumns);
var totalColumnsCount = 1 + _outputGenericSchema.Count;
var getters = new Delegate[totalColumnsCount];
if (activeColumns.Select(c => c.Index).Contains(_outputGenericSchema.Count))
{
getters[totalColumnsCount - 1] = _parent.Stringify
? _parent.GetTextContributionGetter(input, FeatureColumn.Index, _slotNames)
: _parent.GetContributionGetter(input, FeatureColumn.Index);
}
var genericRow = _genericRowMapper.GetRow(input, activeColumns);
for (var i = 0; i < _outputGenericSchema.Count; i++)
{
if (genericRow.IsColumnActive(genericRow.Schema[i]))
{
getters[i] = RowCursorUtils.GetGetterAsDelegate(genericRow, i);
}
}
return(new SimpleRow(OutputSchema, genericRow, getters));
}
public Row GetOutputRow(Row input, Func <int, bool> predicate, out Action disposer)
{
Contracts.AssertValue(input);
Contracts.AssertValue(predicate);
var totalColumnsCount = 1 + _outputGenericSchema.ColumnCount;
var getters = new Delegate[totalColumnsCount];
if (predicate(totalColumnsCount - 1))
{
getters[totalColumnsCount - 1] = _parent.Stringify
? _parent.GetTextContributionGetter(input, InputRoleMappedSchema.Feature.Index, _slotNames)
: _parent.GetContributionGetter(input, InputRoleMappedSchema.Feature.Index);
}
var genericRow = _genericRowMapper.GetRow(input, GetGenericPredicate(predicate), out disposer);
for (var i = 0; i < _outputGenericSchema.ColumnCount; i++)
{
if (genericRow.IsColumnActive(i))
{
getters[i] = RowCursorUtils.GetGetterAsDelegate(genericRow, i);
}
}
return(new SimpleRow(OutputSchema, input, getters));
}