using System;
using System.Collections.Generic;
using JD.Kernel.StaticHelpers;

namespace JD.Collections.ObjectModel
{
    /// <summary>
    /// A read-only implementation of the <see cref="ICollection{T}"/> interface.
    /// Methods that modify the collection throw a NotSupportedException, methods that don't
    /// modify are forwarded through to the wrapped collection.
    /// </summary>
    [Serializable]
    public class ReadOnlyCollection<T> : ReadOnlyCollectionBase<T>
    {
        #region Variables

        private readonly ICollection<T> m_wrappedCollection;

        #endregion

        #region Constructor

        /// <summary>
        /// Creates a ReadOnlyCollection wrapped around the given collection.
        /// </summary>
        /// <param name="wrappedCollection">Collection to wrap.</param>
        public ReadOnlyCollection(ICollection<T> wrappedCollection)
        {
            Throw.IfNull(wrappedCollection, "wrappedCollection");
            m_wrappedCollection = wrappedCollection;
        }

        #endregion

        #region Wrapped members

        /// <summary>
        /// Count.
        /// </summary>
        public override int Count
        {
            get { return m_wrappedCollection.Count; }
        }

        /// <summary>
        /// GetEnumerator.
        /// </summary>
        /// <returns></returns>
        public override IEnumerator<T> GetEnumerator()
        {
            return m_wrappedCollection.GetEnumerator();
        }

        /// <summary>
        /// Contains.
        /// </summary>
        /// <param name="item"></param>
        /// <returns></returns>
        public override bool Contains(T item)
        {
            return m_wrappedCollection.Contains(item);
        }

        /// <summary>
        /// CopyTo.
        /// </summary>
        /// <param name="array"></param>
        /// <param name="arrayIndex"></param>
        public override void CopyTo(T[] array, int arrayIndex)
        {
            m_wrappedCollection.CopyTo(array, arrayIndex);
        }        

        #endregion
    }
}