public Cursor(IChannelProvider provider, IRowCursor input, SchemaImpl schema, Func <int, bool> predicate)
: base(provider, input)
{
_schema = schema;
_active = Utils.BuildArray(_schema.ColumnCount, predicate);
_cachedGetters = new Delegate[_schema.ColumnCount];
_colSizes = new int[_schema.ColumnCount];
int sizeColumnsLim = _schema.Mode == UngroupMode.First ? 1 : _schema.PivotColumnCount;
_fixedSize = 0;
var needed = new List <Func <int> >();
for (int i = 0; i < sizeColumnsLim; i++)
{
var info = _schema.GetPivotColumnInfo(i);
if (info.Size > 0)
{
if (_fixedSize == 0)
{
_fixedSize = info.Size;
}
else if (_schema.Mode == UngroupMode.Inner && _fixedSize > info.Size)
{
_fixedSize = info.Size;
}
else if (_schema.Mode == UngroupMode.Outer && _fixedSize < info.Size)
{
_fixedSize = info.Size;
}
}
else
{
// This will also create and cache a getter for the pivot column.
// That's why MakeSizeGetter is an instance method.
var rawItemType = info.ItemType.RawType;
Func <int, Func <int> > del = MakeSizeGetter <int>;
var mi = del.GetMethodInfo().GetGenericMethodDefinition().MakeGenericMethod(rawItemType);
var sizeGetter = (Func <int>)mi.Invoke(this, new object[] { info.Index });
needed.Add(sizeGetter);
}
}
_sizeGetters = needed.ToArray();
Ch.Assert(_fixedSize > 0 || _sizeGetters.Length > 0);
}
