protected static string TestIsFloatItem(DataViewType type)
{
if (type.GetItemType() == NumberDataViewType.Single)
{
return(null);
}
return("Expected Single or a vector of Single");
}
protected static string TestIsKey(DataViewType type)
{
if (type.GetItemType().GetKeyCount() > 0)
{
return(null);
}
return("Expected Key type of known cardinality");
}
protected static string TestIsTextItem(DataViewType type)
{
if (type.GetItemType() is TextDataViewType)
{
return(null);
}
return("Expected Text type");
}
private ColInfo(string name, DataViewType colType, Segment[] segs, int sizeBase)
{
Contracts.AssertNonEmpty(name);
Contracts.AssertValueOrNull(segs);
Contracts.Assert(sizeBase > 0);
Name = name;
Contracts.Assert(colType.GetItemType().GetRawKind() != 0);
ColType = colType;
Segments = segs;
SizeBase = sizeBase;
}
public ColInfo(string name, int colSrc, DataViewType typeSrc, VectorDataViewType slotTypeSrc)
{
Contracts.AssertNonEmpty(name);
Contracts.Assert(colSrc >= 0);
Contracts.AssertValue(typeSrc);
Contracts.AssertValueOrNull(slotTypeSrc);
Contracts.Assert(slotTypeSrc == null || typeSrc.GetItemType().Equals(slotTypeSrc.ItemType));
Name = name;
Source = colSrc;
TypeSrc = typeSrc;
SlotTypeSrc = slotTypeSrc;
}
public void AssertRep()
{
// Check that all fields have values.
Contracts.AssertNonEmpty(ColumnName);
Contracts.AssertValue(ColumnType);
Contracts.AssertValueOrNull(Generator);
// If Column is computed type, it must have a generator.
Contracts.Assert(IsComputed == (Generator != null));
// Column must have either a generator or a memberInfo value.
Contracts.Assert((Generator == null) != (MemberInfo == null));
// Additional Checks if there is a generator.
if (Generator == null)
{
return;
}
Contracts.AssertValue(ReturnParameterInfo);
// Checks input parameters are (someClass, long, ref value) in that order.
var parameterInfos = Generator.GetMethodInfo().GetParameters().ToArray();
var parameterTypes = (from pInfo in parameterInfos select pInfo.ParameterType).ToArray();
Contracts.Assert(parameterTypes.Length == 3);
Contracts.Assert(parameterTypes[2].IsByRef);
Contracts.Assert(parameterTypes[1] == typeof(long));
Contracts.Assert(!(parameterTypes[0].GetTypeInfo().IsPrimitive || parameterTypes[0] == typeof(string)));
// Check that generator returns void.
Contracts.Assert(Generator.GetMethodInfo().ReturnType == typeof(void));
// Checks that the return type of the generator is compatible with ColumnType.
GetVectorAndItemType("return type", ComputedReturnType, null, out bool isVector, out Type itemType);
Contracts.Assert(isVector == ColumnType is VectorDataViewType);
Contracts.Assert(itemType == ColumnType.GetItemType().RawType);
}
// REVIEW: It would be nice to support propagation of select metadata.
public static IDataView Create <TSrc, TDst>(IHostEnvironment env, string name, IDataView input,
string src, string dst, DataViewType typeSrc, DataViewType typeDst, ValueMapper <TSrc, TDst> mapper,
ValueGetter <VBuffer <ReadOnlyMemory <char> > > keyValueGetter = null, ValueGetter <VBuffer <ReadOnlyMemory <char> > > slotNamesGetter = null)
{
Contracts.CheckValue(env, nameof(env));
env.CheckNonEmpty(name, nameof(name));
env.CheckValue(input, nameof(input));
env.CheckNonEmpty(src, nameof(src));
env.CheckNonEmpty(dst, nameof(dst));
env.CheckValue(typeSrc, nameof(typeSrc));
env.CheckValue(typeDst, nameof(typeDst));
env.CheckValue(mapper, nameof(mapper));
env.Check(keyValueGetter == null || typeDst.GetItemType() is KeyType);
env.Check(slotNamesGetter == null || typeDst.IsKnownSizeVector());
if (typeSrc.RawType != typeof(TSrc))
{
throw env.ExceptParam(nameof(mapper),
"The source column type '{0}' doesn't match the input type of the mapper", typeSrc);
}
if (typeDst.RawType != typeof(TDst))
{
throw env.ExceptParam(nameof(mapper),
"The destination column type '{0}' doesn't match the output type of the mapper", typeDst);
}
bool tmp = input.Schema.TryGetColumnIndex(src, out int colSrc);
if (!tmp)
{
throw env.ExceptParam(nameof(src), "The input data doesn't have a column named '{0}'", src);
}
var typeOrig = input.Schema[colSrc].Type;
// REVIEW: Ideally this should support vector-type conversion. It currently doesn't.
bool ident;
Delegate conv;
if (typeOrig.SameSizeAndItemType(typeSrc))
{
ident = true;
conv = null;
}
else if (!Conversions.Instance.TryGetStandardConversion(typeOrig, typeSrc, out conv, out ident))
{
throw env.ExceptParam(nameof(mapper),
"The type of column '{0}', '{1}', cannot be converted to the input type of the mapper '{2}'",
src, typeOrig, typeSrc);
}
var col = new Column(src, dst);
IDataView impl;
if (ident)
{
impl = new Impl <TSrc, TDst, TDst>(env, name, input, col, typeDst, mapper, keyValueGetter: keyValueGetter, slotNamesGetter: slotNamesGetter);
}
else
{
Func <IHostEnvironment, string, IDataView, Column, DataViewType, ValueMapper <int, int>,
ValueMapper <int, int>, ValueGetter <VBuffer <ReadOnlyMemory <char> > >, ValueGetter <VBuffer <ReadOnlyMemory <char> > >,
Impl <int, int, int> > del = CreateImpl <int, int, int>;
var meth = del.GetMethodInfo().GetGenericMethodDefinition()
.MakeGenericMethod(typeOrig.RawType, typeof(TSrc), typeof(TDst));
impl = (IDataView)meth.Invoke(null, new object[] { env, name, input, col, typeDst, conv, mapper, keyValueGetter, slotNamesGetter });
}
return(new OpaqueDataView(impl));
}
public Impl(IHostEnvironment env, string name, IDataView input, OneToOneColumn col,
DataViewType typeDst, ValueMapper <T1, T2> map1, ValueMapper <T2, T3> map2 = null,
ValueGetter <VBuffer <ReadOnlyMemory <char> > > keyValueGetter = null, ValueGetter <VBuffer <ReadOnlyMemory <char> > > slotNamesGetter = null)
: base(env, name, new[] { col }, input, x => null)
{
Host.Assert(typeDst.RawType == typeof(T3));
Host.AssertValue(map1);
Host.Assert(map2 != null || typeof(T2) == typeof(T3));
_typeDst = typeDst;
_map1 = map1;
_map2 = map2;
if (keyValueGetter != null || slotNamesGetter != null)
{
using (var bldr = Metadata.BuildMetadata(0))
{
if (keyValueGetter != null)
{
AnnotationUtils.AnnotationGetter <VBuffer <ReadOnlyMemory <char> > > mdGetter =
(int c, ref VBuffer <ReadOnlyMemory <char> > dst) => keyValueGetter(ref dst);
bldr.AddGetter(AnnotationUtils.Kinds.KeyValues, new VectorType(TextDataViewType.Instance, _typeDst.GetItemType().GetKeyCountAsInt32(Host)), mdGetter);
}
if (slotNamesGetter != null)
{
int vectorSize = _typeDst.GetVectorSize();
Host.Assert(vectorSize > 0);
AnnotationUtils.AnnotationGetter <VBuffer <ReadOnlyMemory <char> > > mdGetter =
(int c, ref VBuffer <ReadOnlyMemory <char> > dst) => slotNamesGetter(ref dst);
bldr.AddGetter(AnnotationUtils.Kinds.SlotNames, new VectorType(TextDataViewType.Instance, vectorSize), mdGetter);
}
}
}
Metadata.Seal();
}
