public Cursor(RowToRowMapper parent, DataViewRowCursor input, bool[] active)
: base(parent.Host, input)
{
Ch.AssertValue(parent);
Ch.Assert(active == null || active.Length == parent.OutputSchema.Count);
_parent = parent;
_active = active;
_getters = new Delegate[parent._parent.AddedSchema.Columns.Length];
var dstRow = new DataViewConstructionUtils.InputRow <TDst>(_parent.Host, _parent._parent.AddedSchema);
IRowReadableAs <TSrc> inputRow = _parent._typedSrc.GetRow(input);
TSrc src = new TSrc();
TState state = new TState();
TDst dst = new TDst();
_parent._parent._stateInitAction(state);
long lastServedPosition = -1;
Action refresh = () =>
{
if (lastServedPosition != input.Position)
{
inputRow.FillValues(src);
_parent._parent._mapAction(src, dst, state);
dstRow.ExtractValues(dst);
lastServedPosition = input.Position;
}
};
for (int i = 0; i < active.Length; i++)
{
var iinfo = _parent._bindings.MapColumnIndex(out var isSrc, i);
if (isSrc)
{
continue;
}
_getters[iinfo] = Utils.MarshalInvoke(_parent.GetDstGetter <int>, _parent._bindings.Schema[i].Type.RawType, dstRow, _parent._bindings.Schema[i].Name, refresh);
}
}
public Delegate[] CreateGetters(IRow input, Func <int, bool> activeOutput, out Action disposer)
{
disposer = null;
// If no outputs are active, we short-circuit to empty array of getters.
var result = new Delegate[_parent.AddedSchema.Columns.Length];
if (!Enumerable.Range(0, result.Length).Any(activeOutput))
{
return(result);
}
var dstRow = new DataViewConstructionUtils.InputRow <TDst>(_host, _parent.AddedSchema);
IRowReadableAs <TSrc> inputRow = _typedSrc.GetRow(input);
TSrc src = new TSrc();
TDst dst = new TDst();
long lastServedPosition = -1;
Action refresh = () =>
{
if (lastServedPosition != input.Position)
{
inputRow.FillValues(src);
_parent._mapAction(src, dst);
dstRow.ExtractValues(dst);
lastServedPosition = input.Position;
}
};
for (int i = 0; i < result.Length; i++)
{
if (!activeOutput(i))
{
continue;
}
result[i] = Utils.MarshalInvoke(GetDstGetter <int>, dstRow.Schema[i].Type.RawType, dstRow, i, refresh);
}
return(result);
}
protected override Delegate[] CreateGetters(DataViewRow input, IEnumerable <DataViewSchema.Column> activeColumns, out Action disp)
{
disp = null;
var getters = new Delegate[_parent.AddedSchema.Columns.Length];
var dstRow = new DataViewConstructionUtils.InputRow <TDst>(Host, _parent.AddedSchema);
IRowReadableAs <TSrc> inputRow = _typedSrc.GetRow(input);
TSrc src = new TSrc();
TState state = new TState();
TDst dst = new TDst();
_parent._stateInitAction(state);
long lastServedPosition = -1;
Action refresh = () =>
{
if (lastServedPosition != input.Position)
{
inputRow.FillValues(src);
_parent._mapAction(src, dst, state);
dstRow.ExtractValues(dst);
lastServedPosition = input.Position;
}
};
foreach (var col in activeColumns)
{
var iinfo = _bindings.MapColumnIndex(out var isSrc, col.Index);
if (isSrc)
{
continue;
}
getters[iinfo] = Utils.MarshalInvoke(GetDstGetter <int>, col.Type.RawType, dstRow, col.Name, refresh);
}
return(getters);
}
private protected void ExtractValues(TSrc example) => _inputRow.ExtractValues(example);
