// <summary>
// Determines if a common super type (LUB) exists between type1 and type2.
// </summary>
// <returns> true if a common super type between type1 and type2 exists and out commonType represents the common super type. false otherwise along with commonType as null </returns>
internal static bool TryGetCommonType(TypeUsage type1, TypeUsage type2, out TypeUsage commonType)
{
DebugCheck.NotNull(type1);
DebugCheck.NotNull(type2);
commonType = null;
if (type1.EdmEquals(type2))
{
commonType = ForgetConstraints(type2);
return(true);
}
if (Helper.IsPrimitiveType(type1.EdmType) &&
Helper.IsPrimitiveType(type2.EdmType))
{
return(TryGetCommonPrimitiveType(type1, type2, out commonType));
}
EdmType commonEdmType;
if (TryGetCommonType(type1.EdmType, type2.EdmType, out commonEdmType))
{
commonType = ForgetConstraints(TypeUsage.Create(commonEdmType));
return(true);
}
commonType = null;
return(false);
}
internal static bool TryGetCommonType(
TypeUsage type1,
TypeUsage type2,
out TypeUsage commonType)
{
commonType = (TypeUsage)null;
if (type1.EdmEquals((MetadataItem)type2))
{
commonType = TypeSemantics.ForgetConstraints(type2);
return(true);
}
if (Helper.IsPrimitiveType(type1.EdmType) && Helper.IsPrimitiveType(type2.EdmType))
{
return(TypeSemantics.TryGetCommonPrimitiveType(type1, type2, out commonType));
}
EdmType commonEdmType;
if (TypeSemantics.TryGetCommonType(type1.EdmType, type2.EdmType, out commonEdmType))
{
commonType = TypeSemantics.ForgetConstraints(TypeUsage.Create(commonEdmType));
return(true);
}
commonType = (TypeUsage)null;
return(false);
}
internal static bool IsSubTypeOf(TypeUsage subType, TypeUsage superType)
{
if (subType.EdmEquals((MetadataItem)superType))
{
return(true);
}
if (Helper.IsPrimitiveType(subType.EdmType) && Helper.IsPrimitiveType(superType.EdmType))
{
return(TypeSemantics.IsPrimitiveTypeSubTypeOf(subType, superType));
}
return(subType.IsSubtypeOf(superType));
}
// <summary>
// determines if subType is equal to or a sub-type of superType.
// </summary>
// <returns> true if subType is equal to or a sub-type of superType, false otherwise </returns>
internal static bool IsSubTypeOf(TypeUsage subType, TypeUsage superType)
{
DebugCheck.NotNull(subType);
DebugCheck.NotNull(superType);
if (subType.EdmEquals(superType))
{
return(true);
}
if (Helper.IsPrimitiveType(subType.EdmType) &&
Helper.IsPrimitiveType(superType.EdmType))
{
return(IsPrimitiveTypeSubTypeOf(subType, superType));
}
return(subType.IsSubtypeOf(superType));
}