/// <summary>
/// Creates a new entity graph for the given entity and shape and stores it in the
/// cache, or returns the graph from the cache if it is already present there.
/// </summary>
/// <param name="entity"></param>
/// <param name="shape"></param>
/// <returns></returns>
protected EntityGraph <TEntity> GetOrCreate(TEntity entity, IEntityGraphShape shape)
{
{
int key = entity.GetHashCode() ^ shape.GetHashCode();
WeakReference reference = null;
if (_entityGraphs.ContainsKey(key) == false)
{
reference = new WeakReference(null);
_entityGraphs.Add(key, reference);
}
else
{
reference = _entityGraphs[key];
}
if (reference.Target == null)
{
reference.Target = Create(entity, shape);
}
return(_entityGraphs[key].Target as EntityGraph <TEntity>);
}
}