Synnefo » Pithos MS Client

#region

/* -----------------------------------------------------------------------

 * <copyright file="PermissionConverter.cs" company="GRNet">

 * 

 * Copyright 2011-2012 GRNET S.A. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or

 * without modification, are permitted provided that the following

 * conditions are met:

 *

 *   1. Redistributions of source code must retain the above

 *      copyright notice, this list of conditions and the following

 *      disclaimer.

 *

 *   2. Redistributions in binary form must reproduce the above

 *      copyright notice, this list of conditions and the following

 *      disclaimer in the documentation and/or other materials

 *      provided with the distribution.

 *

 *

 * THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS

 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF

 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED

 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN

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 * POSSIBILITY OF SUCH DAMAGE.

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 * The views and conclusions contained in the software and

 * documentation are those of the authors and should not be

 * interpreted as representing official policies, either expressed

 * or implied, of GRNET S.A.

 * </copyright>

 * -----------------------------------------------------------------------

 */

#endregion

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>));

        }

    }

}