/// <summary>
/// Gets the relationship values for a single relationship on a single entity.
/// </summary>
private static IEnumerable <long> GetRelationshipsImpl(Context context, IEntityRef relTypeId, Direction direction, long entityId)
{
long relTypeIdWithDir = relTypeId.Id;
if (direction == Direction.Reverse)
{
relTypeIdWithDir = -relTypeIdWithDir;
}
RelationshipKey key = new RelationshipKey(entityId, relTypeIdWithDir);
List <long> relList;
if (!context.RawData.Relationships.TryGetValue(key, out relList))
{
return(Enumerable.Empty <long>());
}
return(relList);
}
/// <summary>
/// Creates an entity ref for the ID to be checked.
/// </summary>
/// <remarks>
/// The BulkRequestResult graph typically already has type information for the entities being loaded.
/// The security engine requires type information to determine applicable rules.
/// So instead of having it attempt to activate the entities (additional DB trips) to determine the types, just
/// pass the type information along instead.
/// This is done by creating a EntityTypeOnly implementation of IEntity, and packing it into the EntityRef that we pass.
/// </remarks>
/// <param name="data"></param>
/// <param name="entityId"></param>
/// <returns></returns>
private static EntityRef CreateEntityRefForSecurityCheck(BulkRequestResult data, long entityId)
{
EntityRef result;
long isOfTypeRelId = WellKnownAliases.CurrentTenant.IsOfType;
// Look up type information
RelationshipKey key = new RelationshipKey(entityId, isOfTypeRelId);
List <long> typeIds;
if (data.Relationships.TryGetValue(key, out typeIds))
{
IEntity entity = new EntityTypeOnly(entityId, typeIds);
result = new EntityRef(entity);
}
else
{
result = new EntityRef(entityId);
}
return(result);
}
/// <summary>
/// Remove duplicate entries from relationship lists.
/// (that could result if two different nodes point to the same node along the same relationship)
/// </summary>
/// <param name="result"></param>
private static void RemoveDuplicateRelationshipEntries(BulkRequestResult result)
{
// Note: this is a bit messy
// Ideally we could remove the duplicates during the main ReadRelationships loop.
// However, I don't want to return the result sorted, as it will unnecessarily slow down the SQL.
// And I don't want to store individual HashSets in the object if I can help it.
foreach (var pair in result.Relationships)
{
RelationshipKey key = pair.Key;
List <long> targetEntityIds = pair.Value;
// Only consolidate if there are multiple entries
// (And do so, without recreating the list, otherwise we'll break our enumeration)
if (targetEntityIds.Count > 1)
{
HashSet <long> distinct = new HashSet <long>(targetEntityIds);
targetEntityIds.Clear( );
targetEntityIds.AddRange(distinct);
}
}
}
/// <summary>
/// Read relationships, and top level entities, from the database result.
/// </summary>
private static void ReadRelationships(IDataReader reader, BulkSqlQuery query, BulkRequestResult result)
{
// select distinct EntityId, RelSrcId, RelTypeId from #process
while (reader.Read())
{
// Caution: We're in a database-read context, so don't touch the entity model or things will crash.
long toId = reader.GetInt64(0);
int nodeTag = reader.GetInt32(1); // tag of the request node that returned this entity
long fromId = reader.GetInt64(2); // zero for root-level entities
long typeIdWithNeg = reader.GetInt64(3); // relationship type-id, with reverse being indicated with negative values
// Root result entity
if (fromId == 0)
{
result.RootEntities.Add(toId);
}
else
{
// Add to dictionary
var key = new RelationshipKey(fromId, typeIdWithNeg);
var value = toId;
List <long> list;
if (!result.Relationships.TryGetValue(key, out list))
{
list = new List <long>();
result.Relationships[key] = list;
}
list.Add(value);
}
// Implicit relationship security
bool implicitlySecured = false;
if (fromId != 0)
{
var relInfo = query.Relationships[typeIdWithNeg];
implicitlySecured = relInfo.ImpliesSecurity;
}
// Store entity
EntityValue ev;
if (!result.AllEntities.TryGetValue(toId, out ev))
{
ev = new EntityValue {
ImplicitlySecured = implicitlySecured
};
result.AllEntities[toId] = ev;
}
else
{
ev.ImplicitlySecured = ev.ImplicitlySecured && implicitlySecured;
}
// Store the request node that specified members to load for this entity
RequestNodeInfo requestNode = query.RequestNodes [nodeTag];
ev.Nodes.Add(requestNode);
}
#if DEBUG
if (result.RootEntitiesList.Count != 0)
{
throw new InvalidOperationException("Assert false .. expected RootEntityList to be empty.");
}
#endif
result.RootEntitiesList.AddRange(result.RootEntities);
RemoveDuplicateRelationshipEntries(result);
}
