/// <summary>
/// Same subtype may implement same supertype multiple time. Since ID of the supertype is usually same as subtype's ID,
/// that might result with multiple supertype records with the same ID. To avoid duplicate IDs and still keep the
/// deterministic ID values, the supertype's ID is XORed by a hash code taken from the ImplementationName.
/// </summary>
private string GetSubtypeImplementationIdSnippet()
{
if (IsSubtypeOf.ImplementationName == "")
{
return("");
}
else if (IsSubtypeOf.SupportsPersistedSubtypeImplementationColum())
{
return(",\r\n SubtypeImplementationID = " + PersistedSubtypeImplementationIdInfo.GetComputedColumnName(IsSubtypeOf.ImplementationName));
}
else
{
int hash = DomUtility.GetSubtypeImplementationHash(IsSubtypeOf.ImplementationName);
return(",\r\n SubtypeImplementationID = CONVERT(UNIQUEIDENTIFIER, CONVERT(BINARY(4), CONVERT(INT, CONVERT(BINARY(4), ID)) ^ " + hash + ") + SUBSTRING(CONVERT(BINARY(16), ID), 5, 12))");
}
}
public IEnumerable <IConceptInfo> CreateNewConcepts(IsSubtypeOfInfo conceptInfo, IDslModel existingConcepts)
{
var newConcepts = new List <IConceptInfo>();
// Add a subtype reference (for each subtype) to the supertype data structure:
var subtypeReference = new PolymorphicSubtypeReferenceInfo
{
DataStructure = conceptInfo.Supertype,
Referenced = conceptInfo.Subtype,
Name = conceptInfo.GetSubtypeReferenceName()
};
newConcepts.Add(subtypeReference);
newConcepts.Add(new PolymorphicPropertyInfo {
Property = subtypeReference
}); // Minor optimization to reduce the number of macro evaluations.
// Append subtype implementation to the supertype union:
newConcepts.Add(new SubtypeExtendPolymorphicInfo
{
IsSubtypeOf = conceptInfo,
SubtypeImplementationView = conceptInfo.GetImplementationViewPrototype(),
PolymorphicUnionView = conceptInfo.Supertype.GetUnionViewPrototype()
});
var filterBySubtypePrototype = new FilterByInfo {
Source = conceptInfo.Supertype, Parameter = "Rhetos.Dom.DefaultConcepts.FilterSubtype"
};
newConcepts.Add(new SubtypeExtendFilterInfo
{
IsSubtypeOf = conceptInfo,
FilterBySubtype = filterBySubtypePrototype
});
// Add metadata for supertype computation (union):
foreach (DataStructureInfo dependsOn in DslUtility.GetBaseChangesOnDependency(conceptInfo.Subtype, existingConcepts))
{
newConcepts.Add(new ChangesOnChangedItemsInfo
{
Computation = conceptInfo.Supertype,
DependsOn = dependsOn,
FilterType = "Rhetos.Dom.DefaultConcepts.FilterSubtype",
FilterFormula = @"changedItems => new Rhetos.Dom.DefaultConcepts.FilterSubtype
{
Ids = changedItems.Select(" + GetComputeHashIdSelector(conceptInfo) + @").ToArray(),
Subtype = " + CsUtility.QuotedString(conceptInfo.Subtype.Module.Name + "." + conceptInfo.Subtype.Name) + @",
ImplementationName = " + CsUtility.QuotedString(conceptInfo.ImplementationName) + @"
}"
});
}
// Add metadata for subtype implementation:
PersistedSubtypeImplementationIdInfo subtypeImplementationColumn = null;
if (conceptInfo.SupportsPersistedSubtypeImplementationColum())
{
subtypeImplementationColumn = new PersistedSubtypeImplementationIdInfo {
Subtype = conceptInfo.Subtype, ImplementationName = conceptInfo.ImplementationName
};
newConcepts.Add(subtypeImplementationColumn);
}
// Automatic interface implementation:
var implementationView = (SqlViewInfo)existingConcepts.FindByKey(conceptInfo.GetImplementationViewPrototype().GetKey());
if (implementationView == null)
{
implementationView = new ExtensibleSubtypeSqlViewInfo {
IsSubtypeOf = conceptInfo
};
newConcepts.Add(implementationView);
if (subtypeImplementationColumn != null)
{
newConcepts.Add(new SqlDependsOnSqlObjectInfo
{
// The subtype implementation view will use the PersistedSubtypeImplementationColumn.
DependsOn = subtypeImplementationColumn.GetSqlObjectPrototype(),
Dependent = implementationView
});
}
}
// Redirect the developer-provided SQL dependencies from the "Is" concept to the implementation view:
newConcepts.AddRange(DslUtility.CopySqlDependencies(conceptInfo, implementationView, existingConcepts));
return(newConcepts);
}
