HIRASE CONNECTION WK

[C#] Google Protocol Buffers Serializer

Google Protocol Buffersが公開されたとのことで、C#版のシリアライザ（仕様の確認はまた今度）を作ってみました。

namespace ProtocolBuffers
{
    using System;
    using System.IO;
    using System.Text;

    public class Serializer
    {
        #region Serialize
        public static void Serialize<TSerialize>(StreamWriter writer, TSerialize instance)
        {
            SerializeInternal(writer, instance.GetType(), instance, 0);
        }

        public static void Serialize(StreamWriter writer, Type type, Object instance)
        {
            SerializeInternal(writer, type, instance, 0);
        }

        private static void SerializeInternal(StreamWriter writer, Type type, Object instance, Int32 depth)
        {
            if (writer == null) throw new System.ArgumentNullException("writer");
            if (type == null) throw new System.ArgumentNullException("type");
            if (instance == null) throw new System.ArgumentNullException("instance");

            WriteIndent(writer, depth);
            writer.Write(type.Name);
            writer.WriteLine("{");
            foreach (var propertyInfo in type.GetProperties())
            {
                if (!propertyInfo.CanRead) continue;

                var propertyType = propertyInfo.PropertyType;
                var propertyName = propertyInfo.Name;
                var propertyValue = propertyInfo.GetValue(instance, null) ?? String.Empty;
                if (IsSystemType(propertyType))
                {
                    WriteIndent(writer, depth + 1);
                    writer.WriteLine("{0} : \"{1}\"", propertyName, propertyValue.ToString().Replace("\"", "\\\""));
                }
                else
                {
                    SerializeInternal(writer, propertyType, propertyValue, depth + 1);
                }
            }
            WriteIndent(writer, depth);
            writer.WriteLine("}");
        }
        private static void WriteIndent(StreamWriter writer, Int32 depth)
        {
            StringBuilder sb = new StringBuilder();
            sb.Append(' ', depth);
            writer.Write(sb.ToString());
        }
        #endregion
        #region Utility
        private static Boolean IsSystemType(Type type)
        {
            return type.Namespace.StartsWith("System");
        }
        #endregion
    }
}

使い方は、以下

namespace ProtocolBuffers
{
    using System;
    using System.IO;

    public class Test
    {
        public String Name { get; set; }
        public String EMail { get; set; }
    }

    public class Test2
    {
        public Test Test { get; set; }
        public Int32 Hash { get { return this.GetHashCode(); } }
        public DateTime DateTime { get { return DateTime.Now; } }
    }

    class TestProgram
    {
        static void Main(string[] args)
        {
            var testObject = new Test { Name = "Hirase", EMail = "hirase@example.com" };
            var test2Object = new Test2 { Test = testObject };
            using (var writer = new StreamWriter(@"test.pb"))
            {
                Serializer.Serialize<Test2>(writer, test2Object);
            }
        }
    }
}

結果は以下

Test2{
 Test{
  Name : "Hirase"
  EMail : "hirase@example.com"
 }
 Hash : "54267293"
 DateTime : "2008/07/09 14:37:08"
}

投稿日時 : 2008年7月9日 16:10