Synnefo » Pithos MS Client

using System;

using System.Collections.Generic;

using System.IO;

using System.Reflection;

using System.Xml;

using System.Xml.Linq;

namespace ICSharpCode.SharpZipLib.Silverlight.Serialization

{

    /// <summary>

    /// Code originally authored by Rockford Lhotka:

    /// http://www.lhotka.net/weblog/SilverlightSerialization.aspx,

    /// presented here with minor naming and code changes.

    /// </summary>

    public sealed partial class XmlFormatter

    {

        private readonly Dictionary<ISerializable, SerializationInfo> _serializationReferences =

            new Dictionary<ISerializable, SerializationInfo>();

        public void Serialize(Stream serializationStream, object graph)

        {

            var writer = XmlWriter.Create(serializationStream);

            Serialize(writer, graph);

            if (writer != null)

            {

                writer.Flush();

            }

        }

        public void Serialize(TextWriter textWriter, object graph)

        {

            var writer = XmlWriter.Create(textWriter);

            Serialize(writer, graph);

            if (writer != null)

            {

                writer.Flush();

            }

        }

        public void Serialize(XmlWriter writer, object graph)

        {

            _serializationReferences.Clear();

            var document = new XDocument();

            SerializeObject(graph);

            var root = new XElement("g");

            foreach (var item in _serializationReferences)

            {

                root.Add(item.Value.ToXElement());

            }

            document.Add(root);

            document.Save(writer);

        }

        internal SerializationInfo SerializeObject(object obj)

        {

            var thisType = obj.GetType();

            if (!IsSerializable(thisType))

            {

                throw new InvalidOperationException("Object not serializable");

            }

            var mobile = obj as ISerializable;

            if (mobile == null)

            {

                throw new InvalidOperationException(

                    string.Format("Type {0} must implement ISerializable",

                                  thisType.Name));

            }

            SerializationInfo info;

            if (!_serializationReferences.TryGetValue(mobile, out info))

            {

                info = new SerializationInfo(_serializationReferences.Count + 1);

                _serializationReferences.Add(mobile, info);

                mobile.Serialize(info, this);

            }

            return info;

        }

        private static bool IsSerializable(ICustomAttributeProvider objectType)

        {

            var a = objectType.GetCustomAttributes(typeof (SerializableAttribute), false);

            return a.Length > 0;

        }

    }

}