code.grnet.gr Git - pithos-ms-client/blob - trunk/hammock/src/net35/Hammock.Extras/Serialization/JsonConventionResolver.cs

   1 using System;
   2 using System.Collections;
   3 using System.Collections.Generic;
   4 using System.Text;
   5 using Newtonsoft.Json.Serialization;
   6
   7 namespace Hammock.Extras.Serialization
   8 {
   9     /// <summary>
  10     /// Resolves all property names to JSON conventional standard,
  11     /// i.e. JSON name "this_is_a_property" will map to the class property ThisIsAProperty.
  12     /// Also finds any property names suffixed with "Attribute" and converts them
  13     /// into @properties for XML serialization.
  14     /// </summary>
  15     public class JsonConventionResolver : DefaultContractResolver
  16     {
  17         public class ToStringComparer : IComparer
  18         {
  19             public int Compare(object x, object y)
  20             {
  21                 return x.ToString().CompareTo(y.ToString());
  22             }
  23         }
  24
  25         protected override IList<JsonProperty> CreateProperties(Type type, Newtonsoft.Json.MemberSerialization memberSerialization)
  26         {
  27             var properties = base.CreateProperties(type, memberSerialization);
  28
  29             return CreatePropertiesImpl(properties);
  30         }
  31
  32         private static IList<JsonProperty> CreatePropertiesImpl(IList<JsonProperty> properties)
  33         {
  34             foreach (var property in properties)
  35             {
  36                 property.PropertyName = PascalCaseToElement(property.PropertyName);
  37             }
  38
  39             // @'s must come first
  40             var result = properties;
  41
  42             ArrayList.Adapter((IList)result).Sort(new ToStringComparer());
  43
  44             return result;
  45         }
  46
  47         private static string PascalCaseToElement(string input)
  48         {
  49             if (string.IsNullOrEmpty(input))
  50             {
  51                 return null;
  52             }
  53
  54             var attributeForSerialization = input.EndsWith("Attribute");
  55             if(attributeForSerialization)
  56             {
  57                 input = input.Substring(0, input.LastIndexOf("Attribute"));
  58             }
  59
  60             var result = new StringBuilder();
  61             result.Append(char.ToLowerInvariant(input[0]));
  62
  63             for (var i = 1; i < input.Length; i++)
  64             {
  65                 if (char.IsLower(input[i]))
  66                 {
  67                     result.Append(input[i]);
  68                 }
  69                 else
  70                 {
  71                     result.Append("_");
  72                     result.Append(char.ToLowerInvariant(input[i]));
  73                 }
  74             }
  75
  76             return attributeForSerialization? string.Concat("@", result) : result.ToString();
  77         }
  78     }
  79 }