package admin;

import java.util.Collection;

/**
 ** A roomDB object is generated by the 
 ** roomDB generator and contains records 
 ** relating to all the courses.
 ** @author isellar
 **/


public abstract class RoomDB{
	
	public Collection<Room> roomDB;

	/**
	 *  add function will let you add an entry to the room database
	 */
	/*@
	 requires
	  //
	  // The room building/number combination
	  // is unique and non-null
	  //
	   (room.name != null &&
	    !(\exists Room r;
	     roomDB.contains(r);
	      (r.roomNumber == room.roomNumber && r.buildingNumber == room.buildingNumber)));

	 ensures
	  //
	  // If all preconditions are met then
	  // a room is added to the database
	  //
	   (\forall Room r;
   			(roomDB.contains(r) <==>
   				((\old(roomDB.contains(r))) || room == r)
   			));
	@*/

	public abstract void add(Room room);

	/**
	 * The remove function will let you remove an entry the room database
	 */
	/*@
	 requires
	  //
	  // The given room is in the database
	  //
	   (\exists Room r;
	     roomDB.contains(r);
	       (r.equals(room)));

	 ensures
	  //
	  // If all preconditions are met then
	  // the given room will be removed from the DB
	  //
	   (\forall Room r;
	    roomDB.contains(r) <==>
	     r.equals(room) && \old(roomDB).contains(r)); 
	@*/
	public abstract void remove(Room room);
}