/// <summary>
/// Computes the closure of common super types of the set of predefined edm primitive types
/// This is done only once and cached as opposed to previous implementation that was computing
/// this for every new pair of types.
/// </summary>
private static void ComputeCommonTypeClosure()
{
if (null != _commonTypeClosure)
{
return;
}
objectModel.ReadOnlyCollection <PrimitiveType>[,] commonTypeClosure = new objectModel.ReadOnlyCollection <PrimitiveType> [EdmConstants.NumPrimitiveTypes, EdmConstants.NumPrimitiveTypes];
for (int i = 0; i < EdmConstants.NumPrimitiveTypes; i++)
{
commonTypeClosure[i, i] = Helper.EmptyPrimitiveTypeReadOnlyCollection;
}
objectModel.ReadOnlyCollection <PrimitiveType> primitiveTypes = EdmProviderManifest.Instance.GetStoreTypes();
for (int i = 0; i < EdmConstants.NumPrimitiveTypes; i++)
{
for (int j = 0; j < i; j++)
{
commonTypeClosure[i, j] = Intersect(EdmProviderManifest.Instance.GetPromotionTypes(primitiveTypes[i]),
EdmProviderManifest.Instance.GetPromotionTypes(primitiveTypes[j]));
commonTypeClosure[j, i] = commonTypeClosure[i, j];
}
}
TypeSemantics.AssertTypeInvariant("Common Type closure is incorrect",
delegate()
{
for (int i = 0; i < EdmConstants.NumPrimitiveTypes; i++)
{
for (int j = 0; j < EdmConstants.NumPrimitiveTypes; j++)
{
if (commonTypeClosure[i, j] != commonTypeClosure[j, i])
{
return(false);
}
if (i == j && commonTypeClosure[i, j].Count != 0)
{
return(false);
}
}
}
return(true);
});
System.Threading.Interlocked.CompareExchange <objectModel.ReadOnlyCollection <PrimitiveType> [, ]>(ref _commonTypeClosure, commonTypeClosure, null);
}
/// <summary>
/// Validates whether cspace and sspace types are compatible.
/// </summary>
/// <param name="cspaceType">Type in C-Space. Must be a primitive or enumeration type.</param>
/// <param name="storeType">C-Space equivalent of S-space Type. Must be a primitive type.</param>
/// <returns>
/// <c>true</c> if the types are compatible. <c>false</c> otherwise.
/// </returns>
/// <remarks>
/// This methods validate whether cspace and sspace types are compatible. The types are
/// compatible if:
/// both are primitive and the cspace type is a subtype of sspace type
/// or
/// cspace type is an enumeration type whose underlying type is a subtype of sspace type.
/// </remarks>
private static bool ValidateScalarTypesAreCompatible(TypeUsage cspaceType, TypeUsage storeType)
{
Debug.Assert(cspaceType != null, "cspaceType != null");
Debug.Assert(storeType != null, "storeType != null");
Debug.Assert(cspaceType.EdmType.DataSpace == DataSpace.CSpace, "cspace property must have a cspace type");
Debug.Assert(storeType.EdmType.DataSpace == DataSpace.CSpace, "storeType type usage must have a sspace type");
Debug.Assert(
Helper.IsScalarType(cspaceType.EdmType),
"cspace property must be of a primitive or enumeration type");
Debug.Assert(Helper.IsPrimitiveType(storeType.EdmType), "storeType property must be a primitive type");
if (Helper.IsEnumType(cspaceType.EdmType))
{
// For enum cspace type check whether its underlying type is a subtype of the store type. Note that
// TypeSemantics.IsSubTypeOf uses only TypeUsage.EdmType for primitive types so there is no need to copy facets
// from the enum type property to the underlying type TypeUsage created here since they wouldn't be used anyways.
return(TypeSemantics.IsSubTypeOf(TypeUsage.Create(Helper.GetUnderlyingEdmTypeForEnumType(cspaceType.EdmType)), storeType));
}
return(TypeSemantics.IsSubTypeOf(cspaceType, storeType));
}
/// <summary>
/// Returns a Model type usage for a provider type
/// </summary>
/// <returns>model (CSpace) type usage</returns>
internal TypeUsage GetModelTypeUsage()
{
if (_modelTypeUsage == null)
{
EdmType edmType = this.EdmType;
// If the edm type is already a cspace type, return the same type
if (edmType.DataSpace == DataSpace.CSpace || edmType.DataSpace == DataSpace.OSpace)
{
return(this);
}
TypeUsage result;
if (Helper.IsRowType(edmType))
{
RowType sspaceRowType = (RowType)edmType;
EdmProperty[] properties = new EdmProperty[sspaceRowType.Properties.Count];
for (int i = 0; i < properties.Length; i++)
{
EdmProperty sspaceProperty = sspaceRowType.Properties[i];
TypeUsage newTypeUsage = sspaceProperty.TypeUsage.GetModelTypeUsage();
properties[i] = new EdmProperty(sspaceProperty.Name, newTypeUsage);
}
RowType edmRowType = new RowType(properties, sspaceRowType.InitializerMetadata);
result = TypeUsage.Create(edmRowType, this.Facets);
}
else if (Helper.IsCollectionType(edmType))
{
CollectionType sspaceCollectionType = ((CollectionType)edmType);
TypeUsage newTypeUsage = sspaceCollectionType.TypeUsage.GetModelTypeUsage();
result = TypeUsage.Create(new CollectionType(newTypeUsage), this.Facets);
}
else if (Helper.IsRefType(edmType))
{
System.Diagnostics.Debug.Assert(((RefType)edmType).ElementType.DataSpace == DataSpace.CSpace);
result = this;
}
else if (Helper.IsPrimitiveType(edmType))
{
result = ((PrimitiveType)edmType).ProviderManifest.GetEdmType(this);
if (result == null)
{
throw EntityUtil.ProviderIncompatible(System.Data.Entity.Strings.Mapping_ProviderReturnsNullType(this.ToString()));
}
if (!TypeSemantics.IsNullable(this))
{
result = TypeUsage.Create(result.EdmType,
OverrideFacetValues(result.Facets,
new FacetValues {
Nullable = false
}));
}
}
else if (Helper.IsEntityTypeBase(edmType) || Helper.IsComplexType(edmType))
{
result = this;
}
else
{
System.Diagnostics.Debug.Assert(false, "Unexpected type found in entity data reader");
return(null);
}
System.Threading.Interlocked.CompareExchange(ref _modelTypeUsage, result, null);
}
return(_modelTypeUsage);
}
/// <summary>
/// determines if type is of Boolean Kind
/// </summary>
/// <param name="type"></param>
/// <returns></returns>
internal static bool IsBooleanType(TypeUsage type)
{
return(TypeSemantics.IsPrimitiveType(type, PrimitiveTypeKind.Boolean));
}