/// <summary>
/// Retrieves all the entities of the specified type with a reference to any of the provided entities.
/// </summary>
/// <param name="propertyName">The name of the property containing the reference.</param>
/// <param name="referencedEntities">An array of entities to check the reference to.</param>
/// <returns>An array of the references retrieved.</returns>
public override T[] GetEntitiesWithReference <T>(string propertyName, IEntity[] referencedEntities)
{
List <T> entities = null;
using (LogGroup logGroup = LogGroup.StartDebug("Querying the data store based on the provided parameters."))
{
LogWriter.Debug("Property name: " + propertyName);
LogWriter.Debug("Referenced entities #: " + referencedEntities.Length);
if (referencedEntities.Length > 0)
{
Type referencedEntityType = referencedEntities[0].GetType();
if (referencedEntityType != null)
{
LogWriter.Debug("Referenced entity type: " + referencedEntityType.ToString());
}
else
{
LogWriter.Debug("Referenced entity type: [null]");
}
Type type = typeof(T);
EntityReferenceCollection references = new EntityReferenceCollection();
foreach (IEntity referencedEntity in referencedEntities)
{
// Load the references all in one go, to avoid individual loads
references.AddRange(Provider.Referencer.GetReferences(referencedEntity.GetType(), referencedEntity.ID, typeof(T), false));
}
Db4oDataStore store = (Db4oDataStore)GetDataStore(type);
IObjectContainer container = store.ObjectContainer;
entities = new List <T>(
container
.Query <T>(
delegate(T e)
{
bool matches = true;
using (LogGroup logGroup2 = LogGroup.Start("Querying entity.", NLog.LogLevel.Debug))
{
LogWriter.Debug("Checking type " + e.GetType().ToString());
LogWriter.Debug("Entity ID: " + e.ID);
bool foundReference = references.Includes(e.ID, propertyName);
// If referenced entities were provided then entities match if a reference exists
if (referencedEntities != null && referencedEntities.Length > 0)
{
matches = foundReference;
}
// Otherwise the calling code is trying to get entities where NO reference exists, therefore it matches when no reference is found
else
{
matches = !foundReference;
}
LogWriter.Debug("Matches: " + matches);
}
return(matches);
}));
if (entities != null)
{
LogWriter.Debug("entities != null");
}
else
{
LogWriter.Debug("entities == null");
}
LogWriter.Debug("Total objects: " + entities.Count);
}
}
return(Release(entities.ToArray()));
}
