/*
 * This code is from http://weblogs.asp.net/pwelter34/archive/2006/05/03/444961.aspx
 * 
 * Written by Paul Welter
 *
 */

using System;
using System.Collections.Generic;
using System.Text;
using System.Xml.Serialization;
 
namespace Synapse.Core
{
	[XmlRoot("dictionary")]
	public class SerializableDictionary<TKey, TValue>
		: Dictionary<TKey, TValue>, IXmlSerializable
	{
		#region IXmlSerializable Members
		public System.Xml.Schema.XmlSchema GetSchema()
		{
			return null;
		}
 
		public void ReadXml(System.Xml.XmlReader reader)
		{
			XmlSerializer keySerializer = new XmlSerializer(typeof(TKey));
			XmlSerializer valueSerializer = new XmlSerializer(typeof(TValue));
 
			bool wasEmpty = reader.IsEmptyElement;
			reader.Read();
 
			if (wasEmpty)
				return;
 
			while (reader.NodeType != System.Xml.XmlNodeType.EndElement)
			{
				reader.ReadStartElement("item");
 
				reader.ReadStartElement("key");
				TKey key = (TKey)keySerializer.Deserialize(reader);
				reader.ReadEndElement();
 
				reader.ReadStartElement("value");
				TValue value = (TValue)valueSerializer.Deserialize(reader);
				reader.ReadEndElement();
 
				this.Add(key, value);
 
				reader.ReadEndElement();
				reader.MoveToContent();
			}
			reader.ReadEndElement();
		}
 
		public void WriteXml(System.Xml.XmlWriter writer)
		{
			XmlSerializer keySerializer = new XmlSerializer(typeof(TKey));
			XmlSerializer valueSerializer = new XmlSerializer(typeof(TValue));
 
			foreach (TKey key in this.Keys)
			{
				writer.WriteStartElement("item");
 
				writer.WriteStartElement("key");
				keySerializer.Serialize(writer, key);
				writer.WriteEndElement();
 
				writer.WriteStartElement("value");
				TValue value = this[key];
				valueSerializer.Serialize(writer, value);
				writer.WriteEndElement();
 
				writer.WriteEndElement();
			}
		}
		#endregion
	}
}
