ModuleVersionComponent.cs

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using System;
 
namespace IKVM.CoreLib.Modules
{
 
    internal readonly struct ModuleVersionComponent : IComparable<ModuleVersionComponent>
    {
 
        public static bool operator ==(ModuleVersionComponent x, ModuleVersionComponent y) => x.Equals(y);
 
        public static bool operator !=(ModuleVersionComponent x, ModuleVersionComponent y) => x.Equals(y) == false;
 
        public static bool operator <(ModuleVersionComponent x, ModuleVersionComponent y) => Compare(x, y) < 0;
 
        public static bool operator >(ModuleVersionComponent x, ModuleVersionComponent y) => Compare(x, y) > 0;
 
        public static bool operator <=(ModuleVersionComponent x, ModuleVersionComponent y) => Compare(x, y) <= 0;
 
        public static bool operator >=(ModuleVersionComponent x, ModuleVersionComponent y) => Compare(x, y) >= 0;
 
        public static int Compare(ModuleVersionComponent x, ModuleVersionComponent y) => x.CompareTo(y);
 
        readonly int _integer;
        readonly string? _string;
 
        public ModuleVersionComponent(int value)
        {
            _integer = value;
            _string = null;
        }
 
        public ModuleVersionComponent(string value)
        {
            _integer = -1;
            _string = value;
        }
 
        public readonly bool IsInteger => _string is null;
 
        public readonly int AsInteger() => _string is null ? _integer : throw new InvalidOperationException();
 
        public readonly string AsString() => _string ?? _integer.ToString();
 
        public readonly int CompareTo(ModuleVersionComponent other)
        {
            if (IsInteger && other.IsInteger)
                return AsInteger().CompareTo(other.AsInteger());
            else
                return AsString().CompareTo(other.AsString());
        }
 
        public readonly override bool Equals(object? obj)
        {
            return obj is ModuleVersionComponent other && Equals(other);
        }
 
        public readonly bool Equals(ModuleVersionComponent other)
        {
            return CompareTo(other) == 0;
        }
 
        public readonly override int GetHashCode()
        {
            if (IsInteger)
                return AsInteger().GetHashCode();
            else
                return AsString().GetHashCode();
        }
 
    }
 
}