/// <summary>
/// Saves a type into a stream.
/// </summary>
public static void WriteType(ModelSaveContext ctx, DataViewType type)
{
ctx.Writer.Write(type.IsVector());
if (type.IsVector())
{
ctx.Writer.Write(type.AsVector().DimCount());
for (int i = 0; i < type.AsVector().DimCount(); ++i)
{
ctx.Writer.Write(type.AsVector().GetDim(i));
}
ctx.Writer.Write((byte)type.AsVector().ItemType().RawKind());
}
else if (type.IsKey())
{
throw Contracts.ExceptNotImpl("Key cannot be serialized yet.");
}
else
{
ctx.Writer.Write((byte)type.RawKind());
}
}
private static ValueGetter <TDst> GetGetterAsCore <TSrc, TDst>(DataViewType typeSrc, DataViewType typeDst, DataViewRow row, DataViewSchema.Column col)
{
Contracts.Assert(typeof(TSrc) == typeSrc.RawType);
Contracts.Assert(typeof(TDst) == typeDst.RawType);
bool identity;
if (typeSrc.RawKind() == DataKind.UInt32 && typeDst.RawKind() == DataKind.UInt32)
{
var getter = row.GetGetter <uint>(col);
// Multiclass future issue
uint plus = (typeDst.IsKey() ? (uint)1 : (uint)0) - (typeSrc.IsKey() ? (uint)1 : (uint)0);
identity = true;
var src = default(uint);
ValueGetter <uint> mapu =
(ref uint dst) =>
{
getter(ref src);
dst = src + plus;
};
return(mapu as ValueGetter <TDst>);
}
else if (typeSrc.RawKind() == DataKind.Single && typeDst.RawKind() == DataKind.UInt32)
{
var getter = row.GetGetter <float>(col);
// Multiclass future issue
uint plus = (typeDst.IsKey() ? (uint)1 : (uint)0) - (typeSrc.IsKey() ? (uint)1 : (uint)0);
identity = true;
var src = default(float);
ValueGetter <uint> mapu =
(ref uint dst) =>
{
getter(ref src);
dst = (uint)src + plus;
};
return(mapu as ValueGetter <TDst>);
}
else if (typeSrc.RawKind() == DataKind.Int64 && typeDst.RawKind() == DataKind.UInt64)
{
ulong plus = (typeDst.IsKey() ? (ulong)1 : (ulong)0) - (typeSrc.IsKey() ? (ulong)1 : (ulong)0);
var getter = row.GetGetter <long>(col);
identity = true;
var src = default(long);
ValueGetter <ulong> mapu =
(ref ulong dst) =>
{
getter(ref src);
CheckRange(src, dst);
dst = (ulong)src + plus;
};
return(mapu as ValueGetter <TDst>);
}
else if (typeSrc.RawKind() == DataKind.Single && typeDst.RawKind() == DataKind.UInt64)
{
ulong plus = (ulong)((typeDst.IsKey() ? 1 : 0) - (typeSrc.IsKey() ? 1 : 0));
var getter = row.GetGetter <ulong>(col);
identity = true;
var src = default(ulong);
ValueGetter <ulong> mapu =
(ref ulong dst) =>
{
getter(ref src);
CheckRange(src, dst);
dst = (ulong)src + plus;
};
return(mapu as ValueGetter <TDst>);
}
else if (typeSrc.RawKind() == DataKind.Int64 && typeDst.RawKind() == DataKind.UInt32)
{
// Multiclass future issue
uint plus = (typeDst.IsKey() ? (uint)1 : (uint)0) - (typeSrc.IsKey() ? (uint)1 : (uint)0);
var getter = row.GetGetter <long>(col);
identity = true;
var src = default(long);
ValueGetter <uint> mapu =
(ref uint dst) =>
{
getter(ref src);
CheckRange(src, dst);
dst = (uint)src + plus;
};
return(mapu as ValueGetter <TDst>);
}
else if (typeSrc.RawKind() == DataKind.Single && typeDst.RawKind() == DataKind.String)
{
// Multiclass future issue
var getter = row.GetGetter <float>(col);
identity = true;
var src = default(float);
ValueGetter <DvText> mapu =
(ref DvText dst) =>
{
getter(ref src);
dst = new DvText(string.Format("{0}", (int)src));
};
return(mapu as ValueGetter <TDst>);
}
else
{
var getter = row.GetGetter <TSrc>(col);
var conv = Conversions.DefaultInstance.GetStandardConversion <TSrc, TDst>(typeSrc, typeDst, out identity);
if (identity)
{
Contracts.Assert(typeof(TSrc) == typeof(TDst));
return((ValueGetter <TDst>)(Delegate) getter);
}
var src = default(TSrc);
return
((ref TDst dst) =>
{
getter(ref src);
conv(in src, ref dst);
});
}
}