Customize Applications with XML Fragments: Part 2

using System;
using System.Collections.Generic;
using System.Text;
using Bulasoft.Common.Elements;
using System.Xml;

namespace Bulasoft.Common.Serialization
{
    public class ReaderWriterBase
    {
        public ReaderWriterBase(XmlDocument doc)
        {
            _xmlDocument = doc;
        }
        protected IElement CurrentElement
        {
            get
            {
                if (CurrentContext != null)
                    return CurrentContext.Element;
                else
                    return null;
            }
        }

        public XmlElement CurrentXmlElement
        {
            get
            {
                if (CurrentContext != null)
                    return CurrentContext.XmlElement;
                else
                    return null;
            }
        }

        protected Stack<SerializationContext> savedContext = new Stack<SerializationContext>();

        private XmlDocument _xmlDocument;
        public XmlDocument XmlDocument
        {
            get { return _xmlDocument; }
        }

        private SerializationContext _currentContext;
        public SerializationContext CurrentContext
        {
            get { return _currentContext; }
        }

        public void RestoreContext()
        {
            if (savedContext.Count != 0)
            {
                _currentContext = savedContext.Pop();
            }
        }

        public void SaveContext()
        {
            if (CurrentContext != null)
                savedContext.Push(CurrentContext);
            SerializationContext ctx = new SerializationContext();
            if (CurrentContext != null)
            {
                ctx.CacheEntry = CurrentContext.CacheEntry;
                ctx.Element = CurrentContext.Element;
                ctx.XmlElement = CurrentContext.XmlElement;
            }
            _currentContext = ctx;
        }
    }
}