/// <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 CollectionColumnMap CreateFunctionImportStructuralTypeColumnMap(
DbDataReader storeDataReader,
FunctionImportMappingNonComposable mapping,
int resultSetIndex,
EntitySet entitySet,
StructuralType baseStructuralType)
{
FunctionImportStructuralTypeMappingKB resultMapping = mapping.GetResultMapping(resultSetIndex);
if (resultMapping.NormalizedEntityTypeMappings.Count == 0)
{
return(this.CreateColumnMapFromReaderAndType(storeDataReader, (EdmType)baseStructuralType, entitySet, resultMapping.ReturnTypeColumnsRenameMapping));
}
EntityType entityType = baseStructuralType as EntityType;
ScalarColumnMap[] discriminatorColumnMaps = ColumnMapFactory.CreateDiscriminatorColumnMaps(storeDataReader, mapping, resultSetIndex);
HashSet <EntityType> entityTypeSet = new HashSet <EntityType>((IEnumerable <EntityType>)resultMapping.MappedEntityTypes);
entityTypeSet.Add(entityType);
Dictionary <EntityType, TypedColumnMap> typeChoices = new Dictionary <EntityType, TypedColumnMap>(entityTypeSet.Count);
ColumnMap[] baseTypeColumns = (ColumnMap[])null;
foreach (EntityType key in entityTypeSet)
{
ColumnMap[] columnMapsForType = ColumnMapFactory.GetColumnMapsForType(storeDataReader, (EdmType)key, resultMapping.ReturnTypeColumnsRenameMapping);
EntityColumnMap elementColumnMap = ColumnMapFactory.CreateEntityTypeElementColumnMap(storeDataReader, (EdmType)key, entitySet, columnMapsForType, resultMapping.ReturnTypeColumnsRenameMapping);
if (!key.Abstract)
{
typeChoices.Add(key, (TypedColumnMap)elementColumnMap);
}
if (key == baseStructuralType)
{
baseTypeColumns = columnMapsForType;
}
}
MultipleDiscriminatorPolymorphicColumnMap polymorphicColumnMap = new MultipleDiscriminatorPolymorphicColumnMap(TypeUsage.Create((EdmType)baseStructuralType), baseStructuralType.Name, baseTypeColumns, (SimpleColumnMap[])discriminatorColumnMaps, typeChoices, (Func <object[], EntityType>)(discriminatorValues => mapping.Discriminate(discriminatorValues, resultSetIndex)));
return((CollectionColumnMap) new SimpleCollectionColumnMap(baseStructuralType.GetCollectionType().TypeUsage, baseStructuralType.Name, (ColumnMap)polymorphicColumnMap, (SimpleColumnMap[])null, (SimpleColumnMap[])null));
}
