ln.http/ln.http/router/VirtualHostRouter.cs

using ln.http.exceptions;
using System.Collections.Generic;
using System.Net.Http;

namespace ln.http.router
{
    public class VirtualHostRouter
    {
        public HttpRouterDelegate DefaultRoute { get; set; }

        Dictionary<string, HttpRouterDelegate> virtualHosts = new Dictionary<string, HttpRouterDelegate>();

        public VirtualHostRouter()
        {
        }
        public VirtualHostRouter(HttpRouterDelegate defaultRoute)
        {
            DefaultRoute = defaultRoute;
        }
        public VirtualHostRouter(IEnumerable<KeyValuePair<string, HttpRouterDelegate>> routes)
        {
            foreach (KeyValuePair<string, HttpRouterDelegate> route in routes)
                virtualHosts.Add(route.Key, route.Value);
        }
        public VirtualHostRouter(HttpRouterDelegate defaultRoute,IEnumerable<KeyValuePair<string, HttpRouterDelegate>> routes)
            :this(routes)
        {
            DefaultRoute = defaultRoute;
        }
        public VirtualHostRouter(VirtualHostRouter source)
            : this(source.virtualHosts) { }

        public void Add(string hostname,HttpRouterDelegate router) => virtualHosts.Add(hostname, router);
        public void Remove(string hostname) => virtualHosts.Remove(hostname);
        public bool Contains(string hostname) => virtualHosts.ContainsKey(hostname);

        public bool TryGetValue(string hostname, out HttpRouterDelegate router) => virtualHosts.TryGetValue(hostname, out router);

        public bool Route(HttpContext httpContext)
        {
            if (virtualHosts.TryGetValue(httpContext.Request.Host, out HttpRouterDelegate virtualHost))
                return virtualHost(httpContext);
            if (DefaultRoute != null)
                return DefaultRoute(httpContext);

            throw new HttpException(410, string.Format("Gone. Hostname {0} not found on this server.", httpContext.Request.Host));
        }
    }
}