sharee.bike-App/TINKLib/Model/Bikes/BikeCollection.cs

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

using System.Linq;

using BikeInfo = TINK.Model.Bike.BC.BikeInfo;

namespace TINK.Model.Bike
{
    public class BikeCollection : IBikeDictionary<BikeInfo> 
    {
        /// <summary> Holds the bike dictionary object.</summary>
        private  Dictionary<string, BikeInfo> BikeDictionary { get; }

        /// <summary>Constructs an empty bike info dictionary object.</summary>
        public BikeCollection()
        {
            BikeDictionary = new Dictionary<string, BikeInfo>();
        }

        /// <summary> Constructs a bike collection object.</summary>
        /// <param name="bikeDictionary"></param>
        public BikeCollection(Dictionary<string, BikeInfo> bikeDictionary)
        {
            BikeDictionary = bikeDictionary ??
                throw new ArgumentNullException(nameof(bikeDictionary), "Can not construct BikeCollection object.");
        }

        /// <summary> Gets a bike by its id.</summary>
        /// <param name="id">Id of the bike to get.</param>
        /// <returns></returns>
        public BikeInfo GetById(string id)
        {
            return BikeDictionary.FirstOrDefault(x => x.Key == id).Value;
        }

        /// <summary> Gets the count of bikes. </summary>
        public int Count => BikeDictionary.Count;

        /// <summary> Gets if a bike with given id exists.</summary>
        /// <param name="id">Id of bike.</param>
        /// <returns>True if bike is contained, false otherwise.</returns>
        public bool ContainsKey(string id) => BikeDictionary.Keys.Contains(id);

        /// <summary> Gets the enumerator. </summary>
        /// <returns>Enumerator object.</returns>
        public IEnumerator<BikeInfo> GetEnumerator() => BikeDictionary.Values.GetEnumerator();

        /// <summary> Gets the enumerator. </summary>
        /// <returns>Enumerator object.</returns>
        IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
    }
}