scope.scala

package models


/* A scope defines what actions a user can perform. Each possible action is
 * assigned a bit in a bitset (up to 64 different actions are possible in
 * theory, though we only store a limited number of bits in the database).
 */
sealed case class Scope(value: Long) {

  /* Combine two scopes. Does a bitwise or of the two bitsets and returns a
   * new scope.
   */
  def |(x: Scope): Scope =
    Scope(this.value | x.value)


  /* Return true if `this` includes the given scope. */
  def includes(x: Scope): Boolean =
    (this.value & x.value) == x.value

}



object Empty extends Scope(0)
object All   extends Scope(0xFFFFFFFF)

object Read  extends Scope(1)
object Write extends Scope(2)
object Query extends Scope(4)

I was hoping to hide the implementation detail and only expose the Scope type and the instances.

OK. I was just reacting to the comments on the public methods, which described the implementation.