/******************************************************************************
 * Copyright (C) Ultraleap, Inc. 2011-2021.                                   *
 *                                                                            *
 * Use subject to the terms of the Apache License 2.0 available at            *
 * http://www.apache.org/licenses/LICENSE-2.0, or another agreement           *
 * between Ultraleap and you, your company or other organization.             *
 ******************************************************************************/

using System.Collections.Generic;

namespace Leap.Unity
{
    using Query;

    /// <summary>
    /// A simple wrapper around HashSet to provide readonly access.
    /// Useful when you want to return a HashSet to someone but you want
    /// to make sure they don't muck it up!
    /// </summary>
    public struct ReadonlyHashSet<T>
    {
        private readonly HashSet<T> _set;

        public ReadonlyHashSet(HashSet<T> set)
        {
            _set = set;
        }

        public int Count
        {
            get
            {
                return _set.Count;
            }
        }

        public HashSet<T>.Enumerator GetEnumerator()
        {
            return _set.GetEnumerator();
        }

        public bool Contains(T obj)
        {
            return _set.Contains(obj);
        }

        public Query<T> Query()
        {
            return _set.Query();
        }

        public static implicit operator ReadonlyHashSet<T>(HashSet<T> set)
        {
            return new ReadonlyHashSet<T>(set);
        }

        public static implicit operator ReadonlyHashSet<T>(SerializableHashSet<T> set)
        {
            return (HashSet<T>)set;
        }
    }
}