encompass-cs/encompass-cs/utility/EntityTracker.cs

using System;
using System.Collections.Generic;
using System.Text;

namespace Encompass
{
    internal class EntityTracker
    {
        private HashSet<Guid> trackedEntityIDs = new HashSet<Guid>();
        private HashSet<Guid> deactivatedEntityIDs = new HashSet<Guid>();

        public IEnumerable<Guid> TrackedEntityIDs
        {
            get { return trackedEntityIDs; }
        }

        public IEnumerable<Guid> DeactivatedEntityIds
        {
            get { return deactivatedEntityIDs; }
        }

        public void TrackEntity(Guid entityID)
        {
            trackedEntityIDs.Add(entityID);
        }

        public void UntrackEntity(Guid entityID)
        {
            if (trackedEntityIDs.Remove(entityID))
            {
                deactivatedEntityIDs.Remove(entityID);
            }
        }

        public void ActivateEntity(Guid entityID)
        {
            if (deactivatedEntityIDs.Remove(entityID))
            {
                trackedEntityIDs.Add(entityID);
            }
        }

        public void DeactivateEntity(Guid entityID)
        {
            if (trackedEntityIDs.Remove(entityID))
            {
                deactivatedEntityIDs.Add(entityID);
            }
        }

        public bool IsTracking(Guid entityID)
        {
            return trackedEntityIDs.Contains(entityID);
        }
    }
}