/// <summary>
/// MultipleDiscriminatorPolymorphicColumnMap
/// </summary>
internal override ColumnMap Visit(MultipleDiscriminatorPolymorphicColumnMap columnMap, VarMap replacementVarMap)
{
// At this time, we shouldn't ever see this type here; it's for SPROCS which don't use
// the plan compiler.
System.Data.Query.PlanCompiler.PlanCompiler.Assert(false, "unexpected MultipleDiscriminatorPolymorphicColumnMap in ColumnMapCopier");
return(null);
}
/// <summary>
/// Creates a column map for the given reader and function mapping.
/// </summary>
internal static CollectionColumnMap CreateFunctionImportStructuralTypeColumnMap(DbDataReader storeDataReader, FunctionImportMappingNonComposable mapping, int resultSetIndex, EntitySet entitySet, StructuralType baseStructuralType)
{
FunctionImportStructuralTypeMappingKB resultMapping = mapping.GetResultMapping(resultSetIndex);
Debug.Assert(resultMapping != null);
if (resultMapping.NormalizedEntityTypeMappings.Count == 0) // no explicit mapping; use default non-polymorphic reader
{
// if there is no mapping, create default mapping to root entity type or complex type
Debug.Assert(!baseStructuralType.Abstract, "mapping loader must verify abstract types have explicit mapping");
return(CreateColumnMapFromReaderAndType(storeDataReader, baseStructuralType, entitySet, resultMapping.ReturnTypeColumnsRenameMapping));
}
// the section below deals with the polymorphic entity type mapping for return type
EntityType baseEntityType = baseStructuralType as EntityType;
Debug.Assert(null != baseEntityType, "We should have entity type here");
// Generate column maps for all discriminators
ScalarColumnMap[] discriminatorColumns = CreateDiscriminatorColumnMaps(storeDataReader, mapping, resultSetIndex);
// Generate default maps for all mapped entity types
var mappedEntityTypes = new HashSet <EntityType>(resultMapping.MappedEntityTypes);
mappedEntityTypes.Add(baseEntityType); // make sure the base type is represented
Dictionary <EntityType, TypedColumnMap> typeChoices = new Dictionary <EntityType, TypedColumnMap>(mappedEntityTypes.Count);
ColumnMap[] baseTypeColumnMaps = null;
foreach (EntityType entityType in mappedEntityTypes)
{
ColumnMap[] propertyColumnMaps = GetColumnMapsForType(storeDataReader, entityType, resultMapping.ReturnTypeColumnsRenameMapping);
EntityColumnMap entityColumnMap = CreateEntityTypeElementColumnMap(storeDataReader, entityType, entitySet, propertyColumnMaps, resultMapping.ReturnTypeColumnsRenameMapping);
if (!entityType.Abstract)
{
typeChoices.Add(entityType, entityColumnMap);
}
if (entityType == baseStructuralType)
{
baseTypeColumnMaps = propertyColumnMaps;
}
}
// NOTE: We don't have a null sentinel here, because the stored proc won't
// return one anyway; we'll just presume the data's always there.
MultipleDiscriminatorPolymorphicColumnMap polymorphicMap = new MultipleDiscriminatorPolymorphicColumnMap(TypeUsage.Create(baseStructuralType), baseStructuralType.Name, baseTypeColumnMaps, discriminatorColumns, typeChoices, (object[] discriminatorValues) => mapping.Discriminate(discriminatorValues, resultSetIndex));
CollectionColumnMap collection = new SimpleCollectionColumnMap(baseStructuralType.GetCollectionType().TypeUsage, baseStructuralType.Name, polymorphicMap, null, null);
return(collection);
}
internal virtual void Visit(MultipleDiscriminatorPolymorphicColumnMap columnMap, TArgType arg)
{
foreach (var typeDiscriminator in columnMap.TypeDiscriminators)
{
typeDiscriminator.Accept(this, arg);
}
foreach (var typeColumnMap in columnMap.TypeChoices.Values)
{
typeColumnMap.Accept(this, arg);
}
foreach (var property in columnMap.Properties)
{
property.Accept(this, arg);
}
}
/// <summary>
/// MultipleDiscriminatorPolymorphicColumnMap
/// </summary>
internal override void Visit(MultipleDiscriminatorPolymorphicColumnMap columnMap, Dump dumper)
{
using (new AutoXml(dumper, "MultipleDiscriminatorPolymorphic", GetAttributes(columnMap))) {
using (new AutoXml(dumper, "typeDiscriminators")) {
VisitList(columnMap.TypeDiscriminators, dumper);
}
Dictionary <string, object> attrs = new Dictionary <string, object>();
foreach (var tc in columnMap.TypeChoices)
{
attrs.Clear();
attrs.Add("EntityType", tc.Key);
using (new AutoXml(dumper, "choice", attrs)) {
tc.Value.Accept(this, dumper);
}
}
using (new AutoXml(dumper, "default")) {
VisitList(columnMap.Properties, dumper);
}
}
}
internal abstract TResultType Visit(MultipleDiscriminatorPolymorphicColumnMap columnMap, TArgType arg);
