namespace Connected.Entities.Annotations
{
   [Flags]
   public enum ColumnPersistence
   {
      InMemory = 0,
      Read = 1,
      Write = 2,
      ReadWrite = 3
   }

   [AttributeUsage(AttributeTargets.Property | AttributeTargets.Class)]
   public sealed class PersistenceAttribute : Attribute
   {
      public ColumnPersistence Persistence { get; set; }

      public bool IsReadOnly => (Persistence & ColumnPersistence.Read) == ColumnPersistence.Read;
      public bool IsWriteOnly => (Persistence & ColumnPersistence.Write) == ColumnPersistence.Write;
      public bool IsReadWrite => (Persistence & ColumnPersistence.ReadWrite) == ColumnPersistence.ReadWrite;
      public bool IsVirtual => Persistence == ColumnPersistence.InMemory;
   }
}