Open Source Extensible Enterprise n-tier Application Framework with Multilayered Architecture

using System;
using System.Collections.Generic;
using System.IO;
using System.Web;
using System.Xml;
using SiberTek.Xenta.Enums;
using SiberTek.Xenta.Presentation;
using SiberTek.Xenta.Presentation.Presenters;
using SiberTek.Xenta.Presentation.Resources;
using SiberTek.Xenta.Presentation.Utils;
using SiberTek.Xenta.Presentation.Views;
using SiberTek.Xenta.Web.Utils;
using SiberTek.Xenta.Utils;

namespace SiberTek.Xenta.Web.Home.Handlers
{
    public class RSSHandler : IHttpHandler
    {
        #region Properties
        public bool IsReusable
        {
            get
            {
                return true;
            }
        }
        #endregion

        #region Methods
        public void ProcessRequest(HttpContext context)
        {
            context.Response.Clear();

            string language = HttpHelper.GetQueryParam(context, "Language");

            if(!String.IsNullOrEmpty(language))
            {
                int languageID = LocalizationHelper.GetLanguageID(language);
                XmlDocument xml = new XmlDocument();

                XmlDeclaration elDecl = xml.CreateXmlDeclaration("1.0", "utf-8", String.Empty);
                XmlElement elRss = xml.CreateElement("rss");
                XmlElement elChannel = xml.CreateElement("channel");
                XmlElement elChannelTitle = xml.CreateElement("title");
                XmlElement elChannelLink = xml.CreateElement("link");
                XmlElement elChannelDescr = xml.CreateElement("description");
                XmlElement elChannelCopyright = xml.CreateElement("copyright");

                elRss.SetAttribute("version", "2.0");

                elChannelTitle.InnerText = StringManager.GetString("Home.RSSHandler.Channel.Title");
                elChannelLink.InnerText = UrlHelper.GetUrl("home");
                elChannelDescr.InnerText = StringManager.GetString("Home.RSSHandler.Channel.Description");
                elChannelCopyright.InnerText = String.Format(StringManager.GetString("Home.RSSHandler.Channel.Copyright"), UserContext.Current.LocalDateTime.Year);

                xml.AppendChild(elDecl);
                xml.AppendChild(elRss);
                elRss.AppendChild(elChannel);
                elChannel.AppendChild(elChannelTitle);
                elChannel.AppendChild(elChannelLink);
                elChannel.AppendChild(elChannelDescr);
                elChannel.AppendChild(elChannelCopyright);

                try
                {
                    PublicationPresenter presenter = new PublicationPresenter();
                    PublicationListView pList = new PublicationListView();

                    presenter.AttachToView(pList);
                    presenter.Initialize();

                    pList.DataContainer["SearchTerm"] = String.Empty;
                    pList.DataContainer["LanguageID"] = languageID;
                    pList.DataContainer["PublishedOnEnd"] = UserContext.Current.LocalDateTime;
                    pList.DataContainer["ShowHidden"] = false;
                    pList.DataContainer["StartIndex"] = 0;
                    pList.DataContainer["Count"] = AppHelper.GetAppSetting<Int32>("Home.RSSHandler.Channel.Size");

                    presenter.LoadCollection();

                    foreach(ViewDataContainer p in pList.DataContainer["PublicationCollection"] as List<ViewDataContainer>)
                    {
                        XmlElement elItem = xml.CreateElement("item");
                        XmlElement elItemTitle = xml.CreateElement("title");
                        XmlElement elItemDescription = xml.CreateElement("description");
                        XmlElement elItemLink = xml.CreateElement("link");
                        XmlElement elItemAuthor = xml.CreateElement("author");
                        XmlElement elItemPubDate = xml.CreateElement("pubDate");

                        elItemTitle.InnerText = (string)p["Title"];
                        elItemDescription.InnerText = (string)p["Description"];
                        switch((PublicationType)p["Type"])
                        {
                            case PublicationType.Article:
                                elItemLink.InnerText = UrlHelper.FormatUrl("home", "articles/{0}.aspx", p["PublicationID"]);
                                break;
                            case PublicationType.News:
                                elItemLink.InnerText = UrlHelper.FormatUrl("home", "news/{0}.aspx", p["PublicationID"]);
                                break;
                        }
                        elItemAuthor.InnerText = MembershipHelper.GetUsername((int)p["AuthorID"]);
                        elItemPubDate.InnerText = String.Format("{0:R}", (DateTime)p["PublishedOn"]);

                        elChannel.AppendChild(elItem);
                        elItem.AppendChild(elItemTitle);
                        elItem.AppendChild(elItemDescription);
                        elItem.AppendChild(elItemLink);
                        elItem.AppendChild(elItemAuthor);
                    }

                    using(Stream os = context.Response.OutputStream)
                    {
                        xml.Save(os);
                    }

                    context.Response.ContentType = "text/xml";
                }
                catch(Exception ex)
                {
                    context.Response.ContentType = "text/plain";
                    context.Response.Write(ex.Message);
                }
            }
            context.Response.End();
        }
        #endregion

        #region Classes
        private class PublicationListView : IView
        {
            #region Fields
            private readonly ViewDataContainer _dataContainer;
            #endregion

            #region Constructors
            public PublicationListView()
            {
                _dataContainer = new ViewDataContainer();
            }
            #endregion

            #region Properties
            public ViewDataContainer DataContainer
            {
                get
                {
                    return _dataContainer;
                }
            }
            #endregion
        }
        #endregion
    }
}