NHibernate Bitwise

Some helping criterias to use with NHibernates QueryOver when you want to perform bitwise operations on enums.

Usage

Exact match:

var users = Session.QueryOver<User>().Where(x => x.Permissions == (Permissions.Read | Permissions.Write)).List();

One bit matches:

var criteria = BitwiseExpression.On<User>(x => x.Permissions).HasBit(Permissions.Read);
var users = Session.QueryOver<User>().Where(criteria).List();

Bit does not match:

var criteria = BitwiseExpression.On<User>(x => x.Permissions).NotHasBit(Permissions.Full);
var users = Query(session => session.QueryOver<User>().Where(criteria).List());

Any bit matches:

var criteria = BitwiseExpression.On<User>(x => x.Permissions).HasAny(Permissions.Read, Permissions.Write);
var users = Session.QueryOver<User>().Where(criteria).List();

Partial match from some flag variable, user has all of the values on the variable:

CreateUser(Permissions.Read | Permissions.Write | Permissions.Full);
var permissionValue = Permissions.Write | Permissions.Full;
var criteria = BitwiseExpression.On<User>(x => x.Permissions).HasBit(permissionValue);
var users = Query(session => session.QueryOver<User>().Where(criteria).List());