using System.Collections.Generic;

namespace JD.TeaBoxAddinSystem.Addins.Description
{
    /// <summary>
    /// Extension point collection.
    /// </summary>
    internal class ExtensionPointCollection : AddinObjectKeyedCollection<string, ExtensionPoint>
    {
        #region Inner Types

        private class ExtensionPointPathEqualityComparer : IEqualityComparer<string>
        {
            #region IEqualityComparer<string> Members

            public bool Equals(string x, string y)
            {
                x = ExtensionPoint.NormalizePath(x);
                y = ExtensionPoint.NormalizePath(y);

                return x == y;
            }

            public int GetHashCode(string obj)
            {
                return ExtensionPoint.NormalizePath(obj).GetHashCode();
            }

            #endregion
        }

        #endregion

        #region Constructor

        internal ExtensionPointCollection(Module owner)
            : base(owner, new ExtensionPointPathEqualityComparer())
        {
        }

        #endregion

        #region Methods

        /// <summary>
        /// Overriden.
        /// </summary>
        /// <param name="item"></param>
        /// <returns></returns>
        protected override string GetKeyForItem(ExtensionPoint item)
        {
            System.Diagnostics.Debug.Assert(!string.IsNullOrEmpty(item.Path));

            return item.Path;
        }

        #endregion
    }
}