private static bool TryGetCommonPrimitiveType(TypeUsage type1, TypeUsage type2, out TypeUsage commonType)
{
Debug.Assert(type1 != null, "type1 must not be null");
Debug.Assert(Helper.IsPrimitiveType(type1.EdmType), "type1 must be primitive type");
Debug.Assert(type2 != null, "type2 must not be null");
Debug.Assert(Helper.IsPrimitiveType(type2.EdmType), "type2 must be primitive type");
commonType = null;
if (IsPromotableTo(type1, type2))
{
commonType = ForgetConstraints(type2);
return(true);
}
if (IsPromotableTo(type2, type1))
{
commonType = ForgetConstraints(type1);
return(true);
}
objectModel.ReadOnlyCollection <PrimitiveType> superTypes = GetPrimitiveCommonSuperTypes((PrimitiveType)type1.EdmType,
(PrimitiveType)type2.EdmType);
if (superTypes.Count == 0)
{
return(false);
}
commonType = TypeUsage.CreateDefaultTypeUsage(superTypes[0]);
return(null != commonType);
}
private static bool TryGetCommonType(PrimitiveType primitiveType1, PrimitiveType primitiveType2, out EdmType commonType)
{
commonType = null;
if (IsSubTypeOf(primitiveType1, primitiveType2))
{
commonType = primitiveType2;
return(true);
}
if (IsSubTypeOf(primitiveType2, primitiveType1))
{
commonType = primitiveType1;
return(true);
}
objectModel.ReadOnlyCollection <PrimitiveType> superTypes = GetPrimitiveCommonSuperTypes(primitiveType1, primitiveType2);
if (superTypes.Count > 0)
{
commonType = superTypes[0];
return(true);
}
return(false);
}
private static void ComputeCommonTypeClosure()
{
if (null != _commonTypeClosure)
{
return;
}
var commonTypeClosure =
new objectModel.ReadOnlyCollection <PrimitiveType> [EdmConstants.NumPrimitiveTypes, EdmConstants.NumPrimitiveTypes];
for (var i = 0; i < EdmConstants.NumPrimitiveTypes; i++)
{
commonTypeClosure[i, i] = Helper.EmptyPrimitiveTypeReadOnlyCollection;
}
var primitiveTypes = EdmProviderManifest.Instance.GetStoreTypes();
for (var i = 0; i < EdmConstants.NumPrimitiveTypes; i++)
{
for (var 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];
}
}
AssertTypeInvariant(
"Common Type closure is incorrect",
delegate
{
for (var i = 0; i < EdmConstants.NumPrimitiveTypes; i++)
{
for (var 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);
});
Interlocked.CompareExchange(ref _commonTypeClosure, commonTypeClosure, null);
}
private static bool IsSubTypeOf(PrimitiveType subPrimitiveType, PrimitiveType superPrimitiveType)
{
if (object.ReferenceEquals(subPrimitiveType, superPrimitiveType))
{
return(true);
}
if (Helper.AreSameSpatialUnionType(subPrimitiveType, superPrimitiveType))
{
return(true);
}
objectModel.ReadOnlyCollection <PrimitiveType> superTypes = EdmProviderManifest.Instance.GetPromotionTypes(subPrimitiveType);
return(-1 != superTypes.IndexOf(superPrimitiveType));
}
/// <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);
}