Printers.cs

using System;
using System.Collections.Generic;

namespace ScriptCs.Contracts
{
    public class Printers
    {
        private readonly IObjectSerializer _serializer;
        private readonly Dictionary<Type, Func<object, string>> _dictionary = new Dictionary<Type, Func<object, string>>();
        public Printers(IObjectSerializer serializer)
        {
            _serializer = serializer;
        }

        public void AddCustomPrinter<T>(Func<T, string> printer)
        {
            _dictionary[typeof(T)] = x => printer((T)x);
        }

        private string GetStringFor(Type t, object obj)
        {
            Func<object, string> printer;
            if (_dictionary.TryGetValue(t, out printer))
            {
                return printer(obj);
            }
            else {
                return _serializer.Serialize(obj);
            }
        }

        public string GetStringFor(object obj)
        {
            return GetStringFor(obj.GetType(), obj);
        }

        public string GetStringFor<T>(T obj)
        {
            return GetStringFor(typeof(T), obj);
        }
    }
}