Synnefo » Pithos MS Client

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using Newtonsoft.Json;

namespace Pithos.Interfaces

{

    public class PermissionConverter:JsonConverter

    {

        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)

        {

            var dict = (Dictionary<string, string>) value;

            var pairs = from pair in dict

                        group pair by pair.Value into g

                        select new {Permission=g.Key,Names=String.Join(",", g.SelectMany(p=>p.Key))};

            var result=pairs.Aggregate(new StringBuilder(),

                                       (builder, perm) => 

                                       builder.AppendFormat("{0}={1};", perm.Permission, perm.Names));

            var finalValue = result.ToString();

            writer.WriteValue(finalValue);

        }

        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)

        {

            var permissionString= (string) reader.Value;

            var permissions = (from permisson in permissionString.Split(';')

                               let parsed = permisson.Split('=')

                               from account in parsed[1].Split(',')

                               select new { account, Permission = parsed[0] })

                .ToDictionary(perm=>perm.account,perm=>perm.Permission);

            return permissions;

        }

        public override bool CanConvert(Type objectType)

        {

            return (objectType==typeof(Dictionary<string,string>));

        }

    }

}