public void CheckSemantics(IDslModel existingConcepts)
{
if (!(Subtype is IOrmDataStructure))
{
throw new DslSyntaxException(this, "Is (polymorphic) may only be used on a database-mapped data structure, such as Entity or SqlQueryable. "
+ this.Subtype.GetUserDescription() + " is not IOrmDataStructure.");
}
if (ImplementationName == null)
{
throw new DslSyntaxException(this, "ImplementationName must not be null. It is allowed to be an empty string.");
}
if (!string.IsNullOrEmpty(ImplementationName))
{
DslUtility.ValidateIdentifier(ImplementationName, this, "Invalid ImplementationName value.");
}
if (existingConcepts.FindByReference <PolymorphicMaterializedInfo>(pm => pm.Polymorphic, Supertype).Any())
{
// Verifying if the ChangesOnChangedItemsInfo can be created (see IsSubtypeOfMacro)
var dependsOn = DslUtility.GetBaseChangesOnDependency(Subtype, existingConcepts);
if (dependsOn.Count() == 0)
{
throw new DslSyntaxException(this, Subtype.GetUserDescription() + " should be an *extension* of an entity. Otherwise it cannot be used in a materialized polymorphic entity because the system cannot detect when to update the persisted data.");
}
}
}
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);
}