sharee.bike-App/TINKLib/Model/Position.cs

using System;

namespace TINK.Model
{
    public class Position : IPosition
    {
        private const double PRECISSION_LATITUDE_LONGITUDE = 0.000000000000001;

        internal Position(double latitude, double longitude)
        {
            if (!GetIsValid(latitude, longitude))
                throw new ArgumentNullException();

            Latitude = latitude;
            Longitude = longitude;
        }

        public double Latitude { get; private set; }

        public double Longitude { get; private set; }


        /// <summary>
        /// Compares position with a target position.
        /// </summary>
        /// <param name="target">Target position to compare with.</param>
        /// <returns>True if positions are equal.</returns>
        public override bool Equals(object target)
        {
            if (!(target is IPosition targetPosition))
                return false;

            return GetEquals(this, targetPosition);
        }

        public bool Equals(IPosition other)
            => (other is Position position) && position.Equals(this as object);

        public override int GetHashCode()
        {
            var hashCode = -1416534245;
            hashCode = hashCode * -1521134295 + Latitude.GetHashCode();
            hashCode = hashCode * -1521134295 + Longitude.GetHashCode();
            return hashCode;
        }

        public bool IsValid => GetIsValid(Latitude, Longitude);

        public static bool GetEquals(IPosition source, IPosition target)
        {
            if (source == null || target == null)
                return source == null ^ target == null;

            if (!source.IsValid || !target.IsValid)
                return !source.IsValid ^ !target.IsValid;

            return Math.Abs(source.Latitude - target.Latitude) < PRECISSION_LATITUDE_LONGITUDE
                && Math.Abs(source.Longitude - target.Longitude) < PRECISSION_LATITUDE_LONGITUDE;
        }

        public static bool GetIsValid(double latitude, double longitude)
            => !double.IsNaN(latitude) && !double.IsNaN(longitude);
    }
}