C# Custom_Tracer类代码示例

        /// <summary> Constructor for a new instance of the Static_Pages_Builder class </summary>
        /// <param name="Primary_Web_Server_URL"> URL for the primary web server </param>
        /// <param name="Static_Data_Location"> Network location for the data directory </param>
        /// <param name="Default_Skin"> Default skin code </param>
        public Static_Pages_Builder(string Primary_Web_Server_URL, string Static_Data_Location, string Default_Skin)
        {
            primaryWebServerUrl = Primary_Web_Server_URL;
            staticSobekcmDataLocation = Static_Data_Location;
            staticSobekcmLocation = UI_ApplicationCache_Gateway.Settings.Servers.Application_Server_Network;

            tracer = new Custom_Tracer();
            assistant = new SobekCM_Assistant();

            // Save all the objects needed by the SobekCM Library
            defaultSkin = Default_Skin;

            // Create the mode object
            currentMode = new Navigation_Object
                              {
                                  ViewerCode = "citation",
                                  Skin = String.Empty,
                                  Mode = Display_Mode_Enum.Item_Display,
                                  Language = Web_Language_Enum.English,
                                  Base_URL = primaryWebServerUrl
                              };

            // Set some constant settings
            // SobekCM.Library.UI_ApplicationCache_Gateway.Settings.Watermarks_URL = primary_web_server_url + "/design/wordmarks/";
            UI_ApplicationCache_Gateway.Settings.Base_SobekCM_Location_Relative = primaryWebServerUrl;

            // Ensure all the folders exist
            if (!Directory.Exists(staticSobekcmDataLocation))
                Directory.CreateDirectory(staticSobekcmDataLocation);
            if (!Directory.Exists(staticSobekcmDataLocation + "\\rss"))
                Directory.CreateDirectory(staticSobekcmDataLocation + "\\rss");
        }

        /// <summary> Adds the main view section to the page turner </summary>
        /// <param name="placeHolder"> Main place holder ( &quot;mainPlaceHolder&quot; ) in the itemNavForm form into which the the bulk of the item viewer's output is displayed</param>
        /// <param name="Tracer"> Trace object keeps a list of each method executed and important milestones in rendering </param>
        public override void Add_Main_Viewer_Section(PlaceHolder placeHolder, Custom_Tracer Tracer)
        {
            if (Tracer != null)
            {
                Tracer.Add_Trace("Feature_ItemViewer.Add_Main_Viewer_Section", "Adds one literal with all the html");
            }

            // Build the value
            StringBuilder builder = new StringBuilder(5000);

            // Save the current viewer code
            string current_view_code = CurrentMode.ViewerCode;

            // Start the citation table
            builder.AppendLine("\t\t<!-- FEATURE VIEWER OUTPUT -->" );
            builder.AppendLine("\t\t<td align=\"left\" height=\"40px\" ><span class=\"SobekViewerTitle\"><b>Index of Features</b></span></td></tr>" );
            builder.AppendLine("\t\t<tr><td class=\"SobekDocumentDisplay\">");
            builder.AppendLine("\t\t\t<div class=\"SobekCitation\">");

            // Get the list of streets from the database
            Map_Features_DataSet features = SobekCM_Database.Get_All_Features_By_Item( CurrentItem.Web.ItemID, Tracer );
            Create_Feature_Index( builder, features );

            // Finish the citation table
            builder.AppendLine( "\t\t\t</div>"  );
            builder.AppendLine("\t\t</td>" );
            builder.AppendLine("\t\t<!-- END FEATURE VIEWER OUTPUT -->" );

            // Restore the mode
            CurrentMode.ViewerCode = current_view_code;

            // Add the HTML for the image
            Literal mainLiteral = new Literal {Text = builder.ToString()};
            placeHolder.Controls.Add( mainLiteral );
        }

        /// <summary> Writes the HTML generated by this error html subwriter directly to the response stream </summary>
        /// <param name="Output"> Stream to which to write the HTML for this subwriter </param>
        /// <param name="Tracer"> Trace object keeps a list of each method executed and important milestones in rendering </param>
        /// <returns> TRUE -- Value indicating if html writer should finish the page immediately after this, or if there are other controls or routines which need to be called first </returns>
        public override bool Write_HTML(TextWriter Output, Custom_Tracer Tracer)
        {
            Tracer.Add_Trace("Error_HtmlSubwriter.Write_HTML", "Rendering HTML");

            // Start the page container
            Output.WriteLine("<div id=\"pagecontainer\">");
            Output.WriteLine("<br />");

                Output.WriteLine("<center>");

                Output.WriteLine("  <br /><br />");
                Output.WriteLine("<span style=\"font-size:large; color:red\">");
                Output.WriteLine("    <b>Deprecated URL detected</b>");
                Output.WriteLine("</span>");
                Output.WriteLine("<span style=\"font-size:1.2em\">");
                Output.WriteLine("  <br /><br />");
                Output.WriteLine("The URL you entered is a legacy URL.  Support for this URL will end shortly.<br /><br />Please update your records to the new URL below:<br /><br />");
                Output.WriteLine("<a href=\"" + currentMode.Error_Message + "\">" + currentMode.Error_Message + "</a>");
                Output.WriteLine("  <br /><br /><br /><br />");
                Output.WriteLine("</span>");
                Output.WriteLine("</center>");
                Output.WriteLine();

                Output.WriteLine("<!-- Close the pagecontainer div -->");
                Output.WriteLine("</div>");
                Output.WriteLine();

            return true;
        }

        /// <summary> Read the source browse and info static html files and create the
        /// appropriate <see cref="HTML_Based_Content"/> object with all the bibliographic information
        /// (author, keywords, description, title, code) loaded from the header in the HTML file</summary>
        /// <param name="Source_URL"> URL to the source HTML document, retrievable via the web</param>
        /// <param name="Retain_Entire_Display_Text"> Flag indicates whether the entire display text should be retained (as it is about to be displayed) or just the basic information from the HEAD of the file </param>
        /// <param name="Tracer"> Trace object keeps a list of each method executed and important milestones in rendering </param>
        /// <returns> Fully built browse info object with all the bibliographic information</returns>
        public static HTML_Based_Content Read_Web_Document(string Source_URL,  bool Retain_Entire_Display_Text, Custom_Tracer Tracer)
        {
            try
            {
                if (Tracer != null)
                {
                    Tracer.Add_Trace("HTML_Based_Content_Reader.Read_Web_Document", "Reading source file via web response");
                }

                // the html retrieved from the page
                string displayText;
                WebRequest objRequest = WebRequest.Create(Source_URL);
                WebResponse objResponse = objRequest.GetResponse();

                // the using keyword will automatically dispose the object once complete
                using (StreamReader sr = new StreamReader(objResponse.GetResponseStream()))
                {
                    displayText = sr.ReadToEnd();
                    // Close and clean up the StreamReader
                    sr.Close();
                }

                // Convert this to the object
                return Text_To_HTML_Based_Content(displayText, Retain_Entire_Display_Text, String.Empty);
            }
            catch
            {
                return null;
            }
        }

        /// <summary> Adds the main view section to the page turner </summary>
        /// <param name="placeHolder"> Main place holder ( &quot;mainPlaceHolder&quot; ) in the itemNavForm form into which the the bulk of the item viewer's output is displayed</param>
        /// <param name="Tracer"> Trace object keeps a list of each method executed and important milestones in rendering </param>
        public override void Add_Main_Viewer_Section(PlaceHolder placeHolder, Custom_Tracer Tracer)
        {
            if (Tracer != null)
            {
                Tracer.Add_Trace("Download_Only_ItemViewer.Add_Main_Viewer_Section", "Adds one literal with all the html");
            }

            // Build the value
            StringBuilder builder = new StringBuilder(1500);

            // Save the current viewer code
            string current_view_code = CurrentMode.ViewerCode;

            // Start the citation table
            builder.AppendLine("\t\t<!-- DOWNLOAD ONLY VIEWER OUTPUT -->" );
            builder.AppendLine("\t\t<td class=\"SobekDocumentDisplay\">" );
            builder.AppendLine("\t\t\t<div class=\"SobekCitation\">" );

            builder.AppendLine("\t\t\t</div>" );

            // Finish the table
            builder.AppendLine( "\t\t</td>" );
            builder.AppendLine("\t\t<!-- END DOWNLOAD ONLY VIEWER OUTPUT -->"  );

            // Restore the mode
            CurrentMode.ViewerCode = current_view_code;

            // Add the HTML for the image
            Literal mainLiteral = new Literal {Text = builder.ToString()};
            placeHolder.Controls.Add( mainLiteral );
        }

        public override void Add_Main_Viewer_Section(PlaceHolder MainPlaceHolder, Custom_Tracer Tracer)
        {
            StringBuilder responseBuilder = new StringBuilder();

            // Calculate the title and url
            string title = HttpUtility.HtmlEncode(CurrentItem.Bib_Info.Main_Title.Title);
            string share_url = CurrentMode.Base_URL + "/" + CurrentItem.BibID + "/" + CurrentItem.VID;
            if (HttpContext.Current != null)
                share_url = HttpContext.Current.Items["Original_URL"].ToString().Replace("&", "%26").Replace("?", "%3F").Replace("http://", "").Replace("=", "%3D").Replace("\"", """);

            responseBuilder.AppendLine("<!-- Share form -->");
            responseBuilder.AppendLine("<div id=\"shareform_content\">");

            responseBuilder.AppendLine("<a href=\"http://www.facebook.com/share.php?u=" + share_url + "&amp;t=" + title + "\" target=\"FACEBOOK_WINDOW\" onmouseover=\"facebook_share.src='" + CurrentMode.Base_URL + "default/images/facebook_share_h.gif'\" onmouseout=\"facebook_share.src='" + CurrentMode.Base_URL + "default/images/facebook_share.gif'\" onclick=\"\"><img class=\"ResultSavePrintButtons\" border=\"0px\" id=\"facebook_share\" name=\"facebook_share\" src=\"" + CurrentMode.Base_URL + "default/images/facebook_share.gif\" alt=\"FACEBOOK\" /></a>");
            responseBuilder.AppendLine("<a href=\"http://buzz.yahoo.com/buzz?targetUrl=" + share_url + "&amp;headline=" + title + "\" target=\"YAHOOBUZZ_WINDOW\" onmouseover=\"yahoobuzz_share.src='" + CurrentMode.Base_URL + "default/images/yahoobuzz_share_h.gif'\" onmouseout=\"yahoobuzz_share.src='" + CurrentMode.Base_URL + "default/images/yahoobuzz_share.gif'\" onclick=\"\"><img class=\"ResultSavePrintButtons\" border=\"0px\" id=\"yahoobuzz_share\" name=\"yahoobuzz_share\" src=\"" + CurrentMode.Base_URL + "default/images/yahoobuzz_share.gif\" alt=\"YAHOO BUZZ\" /></a>");
            responseBuilder.AppendLine("<br />");

            responseBuilder.AppendLine("<a href=\"http://twitter.com/home?status=Currently reading " + share_url + "\" target=\"TWITTER_WINDOW\" onmouseover=\"twitter_share.src='" + CurrentMode.Base_URL + "default/images/twitter_share_h.gif'\" onmouseout=\"twitter_share.src='" + CurrentMode.Base_URL + "default/images/twitter_share.gif'\" onclick=\"\"><img class=\"ResultSavePrintButtons\" border=\"0px\" id=\"twitter_share\" name=\"twitter_share\" src=\"" + CurrentMode.Base_URL + "default/images/twitter_share.gif\" alt=\"TWITTER\" /></a>");
            responseBuilder.AppendLine("<a href=\"http://www.google.com/bookmarks/mark?op=add&amp;bkmk=" + share_url + "&amp;title=" + title + "\" target=\"GOOGLE_WINDOW\" onmouseover=\"google_share.src='" + CurrentMode.Base_URL + "default/images/google_share_h.gif'\" onmouseout=\"google_share.src='" + CurrentMode.Base_URL + "default/images/google_share.gif'\" onclick=\"\"><img class=\"ResultSavePrintButtons\" border=\"0px\" id=\"google_share\" name=\"google_share\" src=\"" + CurrentMode.Base_URL + "default/images/google_share.gif\" alt=\"GOOGLE SHARE\" /></a>");
            responseBuilder.AppendLine("<br />");

            responseBuilder.AppendLine("<a href=\"http://www.stumbleupon.com/submit?url=" + share_url + "&amp;title=" + title + "\" target=\"STUMBLEUPON_WINDOW\" onmouseover=\"stumbleupon_share.src='" + CurrentMode.Base_URL + "default/images/stumbleupon_share_h.gif'\" onmouseout=\"stumbleupon_share.src='" + CurrentMode.Base_URL + "default/images/stumbleupon_share.gif'\" onclick=\"\"><img class=\"ResultSavePrintButtons\" border=\"0px\" id=\"stumbleupon_share\" name=\"stumbleupon_share\" src=\"" + CurrentMode.Base_URL + "default/images/stumbleupon_share.gif\" alt=\"STUMBLEUPON\" /></a>");
            responseBuilder.AppendLine("<a href=\"http://myweb.yahoo.com/myresults/bookmarklet?t=" + title + "&amp;u=" + share_url + "\" target=\"YAHOO_WINDOW\" onmouseover=\"yahoo_share.src='" + CurrentMode.Base_URL + "default/images/yahoo_share_h.gif'\" onmouseout=\"yahoo_share.src='" + CurrentMode.Base_URL + "default/images/yahoo_share.gif'\" onclick=\"\"><img class=\"ResultSavePrintButtons\" border=\"0px\" id=\"yahoo_share\" name=\"yahoo_share\" src=\"" + CurrentMode.Base_URL + "default/images/yahoo_share.gif\" alt=\"YAHOO SHARE\" /></a>");
            responseBuilder.AppendLine("<br />");

            responseBuilder.AppendLine("<a href=\"http://digg.com/submit?phase=2&amp;url=" + share_url + "&amp;title=" + title + "\" target=\"DIGG_WINDOW\" onmouseover=\"digg_share.src='" + CurrentMode.Base_URL + "default/images/digg_share_h.gif'\" onmouseout=\"digg_share.src='" + CurrentMode.Base_URL + "default/images/digg_share.gif'\" onclick=\"\"><img class=\"ResultSavePrintButtons\" border=\"0px\" id=\"digg_share\" name=\"digg_share\" src=\"" + CurrentMode.Base_URL + "default/images/digg_share.gif\" alt=\"DIGG\" /></a>");
            responseBuilder.AppendLine("<a onmouseover=\"favorites_share.src='" + CurrentMode.Base_URL + "default/images/favorites_share_h.gif'\" onmouseout=\"favorites_share.src='" + CurrentMode.Base_URL + "default/images/favorites_share.gif'\" onclick=\"javascript:add_to_favorites();\"><img class=\"ResultSavePrintButtons\" border=\"0px\" id=\"favorites_share\" name=\"favorites_share\" src=\"" + CurrentMode.Base_URL + "default/images/favorites_share.gif\" alt=\"MY FAVORITES\" /></a>");
            responseBuilder.AppendLine("<br />");

            responseBuilder.AppendLine("</div>");
            responseBuilder.AppendLine();

            MainPlaceHolder.Controls.Add(new Literal() { Text = responseBuilder.ToString() });
        }

        /// <summary> Adds the main view section to the page turner </summary>
        /// <param name="placeHolder"> Main place holder ( &quot;mainPlaceHolder&quot; ) in the itemNavForm form into which the the bulk of the item viewer's output is displayed</param>
        /// <param name="Tracer"> Trace object keeps a list of each method executed and important milestones in rendering </param>
        public override void Add_Main_Viewer_Section(PlaceHolder placeHolder, Custom_Tracer Tracer)
        {
            if (Tracer != null)
            {
                Tracer.Add_Trace("EmbeddedVideo_ItemViewer.Add_Main_Viewer_Section", "Adds one literal with all the html");
            }

            //Determine the name of the FLASH file
            string youtube_url = CurrentItem.Bib_Info.Location.Other_URL;
            if (youtube_url.IndexOf("watch") > 0)
                youtube_url = youtube_url.Replace("watch?v=", "v/") + "?fs=1&amp;hl=en_US";
            const int width = 600;
            const int height = 480;

            // Add the HTML for the image
            StringBuilder result = new StringBuilder(500);
            result.AppendLine("        <!-- EMBEDDED VIDEO VIEWER OUTPUT -->");
            result.AppendLine("          <td align=\"left\"><span class=\"SobekViewerTitle\"><b>Streaming Video</b></span></td>");
            result.AppendLine("        </tr>");
            result.AppendLine("        <tr>");
            result.AppendLine("          <td class=\"SobekCitationDisplay\">");

            result.AppendLine(CurrentItem.Behaviors.Embedded_Video);

            result.AppendLine("          </td>");
            result.AppendLine("        <!-- END EMBEDDED VIDEO VIEWER OUTPUT -->");

            Literal mainLiteral = new Literal { Text = result.ToString() };
            placeHolder.Controls.Add(mainLiteral);
        }

        /// <summary> This provides an opportunity for the viewer to perform any pre-display work
        /// which is necessary before entering any of the rendering portions </summary>
        /// <param name="Tracer"> Trace object keeps a list of each method executed and important milestones in rendering </param>
        /// <remarks> This methods pulls the text to display and determines the width </remarks>
        public override void Perform_PreDisplay_Work(Custom_Tracer Tracer)
        {
            // Set some defaults
            text_from_file = String.Empty;
            file_does_not_exist = false;
            error_occurred = false;
            width = -1;

            if (FileName.Length > 0)
            {
                string filesource = CurrentItem.Web.Source_URL + "/" + FileName;
                text_from_file = Get_Html_Page(filesource, Tracer);

                // Did this work?
                if (text_from_file.Length > 0)
                {
                    string[] splitter = text_from_file.Split("\n".ToCharArray());
                    foreach (string thisString in splitter)
                    {
                        width = Math.Max(width, thisString.Length*9);
                    }
                   // width = Math.Min(width, 800);
                }
            }
            else
            {
                file_does_not_exist = true;
            }
        }

        /// <summary> Add the HTML to be displayed in the search box </summary>
        /// <param name="Output"> Textwriter to write the HTML for this viewer</param>
        /// <param name="Tracer">Trace object keeps a list of each method executed and important milestones in rendering</param>
        /// <remarks> This adds the title of the into the box </remarks>
        public override void Add_Search_Box_HTML(TextWriter Output, Custom_Tracer Tracer)
        {
            // Normalize the submode
            string submode = currentMode.Info_Browse_Mode.ToLower();
            if ((submode != "views") && (submode != "itemviews") && (submode != "titles") && (submode != "items") && (submode != "definitions"))
            {
                submode = "views";
            }

            // Show the next data, depending on type
            switch (submode)
            {
                case "views":
                    Output.WriteLine("<h1>History of Collection-Level Usage</h1>");
                    break;

                case "itemviews":
                    Output.WriteLine("<h1>History of Item Usage</h1>");
                    break;

                case "titles":
                    Output.WriteLine("<h1>Most Accessed Titles</h1>");
                    break;

                case "items":
                    Output.WriteLine("<h1>Most Accessed Items</h1>");
                    break;

                case "definitions":
                    Output.WriteLine("<h1>Definitions of Terms Used</h1>");
                    break;
            }
        }

        /// <summary> Perform all the work of adding text directly to the response stream back to the web user </summary>
        /// <param name="Output"> Stream to which to write the text for this main writer </param>
        /// <param name="Tracer"> Trace object keeps a list of each method executed and important milestones in rendering </param>
        public override void Add_Text_To_Page(TextWriter Output, Custom_Tracer Tracer)
        {
            Tracer.Add_Trace("Html_Echo_MainWriter.Add_Text_To_Page", "Reading the text from the file and echoing back to the output stream");

            try
            {
                FileStream fileStream = new FileStream(fileToEcho, FileMode.Open, FileAccess.Read);
                StreamReader reader = new StreamReader(fileStream);
                string line = reader.ReadLine();
                while ( line != null )
                {
                    Output.WriteLine(line);
                    line = reader.ReadLine();
                }
                reader.Close();
            }
            catch
            {
                Output.WriteLine("ERROR READING THE SOURCE FILE");
            }

            Tracer.Add_Trace("Html_Echo_MainWriter.Add_Text_To_Page", "Finished reading and writing the file");

            Output.WriteLine("<br /><br /><b>TRACE ROUTE</b>");
            Output.WriteLine("<br /><br />Total Execution Time: " + Tracer.Milliseconds + " Milliseconds<br /><br />");
            Output.WriteLine(Tracer.Complete_Trace + "<br />");
        }

        /// <summary> Constructor for a new instance of the Saved_Searches_MySobekViewer class </summary>
        /// <param name="User"> Authenticated user information </param>
        /// <param name="Translator"> Translation / language support object for writing the user interface is multiple languages</param>
        /// <param name="currentMode"> Mode / navigation information for the current request</param>
        /// <param name="Tracer">Trace object keeps a list of each method executed and important milestones in rendering</param>
        public Saved_Searches_MySobekViewer(User_Object User, 
            Language_Support_Info Translator, 
            SobekCM_Navigation_Object currentMode,
            Custom_Tracer Tracer)
            : base(User)
        {
            Tracer.Add_Trace("Saved_Searches_MySobekViewer.Constructor", String.Empty);

            user = User;
            base.Translator = Translator;

            if (currentMode.isPostBack)
            {
                // Pull the standard values
                NameValueCollection form = HttpContext.Current.Request.Form;

                string item_action = form["item_action"].ToUpper().Trim();
                string folder_id = form["folder_id"].Trim();

                if (item_action == "REMOVE")
                {
                    int folder_id_int;
                    if (Int32.TryParse(folder_id, out folder_id_int))
                        SobekCM_Database.Delete_User_Search(folder_id_int, Tracer);
                }

                HttpContext.Current.Response.Redirect(HttpContext.Current.Items["Original_URL"].ToString());
            }
        }

        /// <summary> Builds a brief version of a digital resource, used when displaying the 'FULL VIEW' in 
        /// a search result or browse list </summary>
        /// <param name="METS_Location"> Location (URL) of the METS file to read via HTTP </param>
        /// <param name="Tracer"> Trace object keeps a list of each method executed and important milestones in rendering</param>
        /// <returns> Briefly built version of a digital resource </returns>
        public SobekCM_Item Build_Brief_Item(string METS_Location, Custom_Tracer Tracer)
        {
            if (Tracer != null)
            {
                Tracer.Add_Trace("SobekCM_METS_Based_ItemBuilder.Build_Brief_Item", "Create the requested item");
            }

            try
            {
                // Get the response object for this METS file
                string mets_file = METS_Location.Replace("\\", "/") + "/citation_mets.xml";

                SobekCM_Item thisPackage = Build_Item_From_METS(mets_file, "citation_mets.xml", Tracer);

                if (thisPackage == null)
                {
                    if (Tracer != null)
                        Tracer.Add_Trace("SobekCM_METS_Based_ItemBuilder.Build_Brief_Item", "Unable to find/read either METS file", Custom_Trace_Type_Enum.Error);
                }

                if (Tracer != null)
                {
                    Tracer.Add_Trace("SobekCM_METS_Based_ItemBuilder.Build_Brief_Item", "Finished building this item");
                }

                return thisPackage;
            }
            catch (Exception ee)
            {
                if (Tracer != null)
                    Tracer.Add_Trace("SobekCM_METS_Based_ItemBuilder.Build_Brief_Item", ee.ToString().Replace("\n", "<br />"), Custom_Trace_Type_Enum.Error);
                return null;
            }
        }

        /// <summary> Stream to which to write the HTML for this subwriter  </summary>
        /// <param name="Output"> Response stream for the item viewer to write directly to </param>
        /// <param name="Tracer"> Trace object keeps a list of each method executed and important milestones in rendering </param>
        public override void Write_Main_Viewer_Section(TextWriter Output, Custom_Tracer Tracer)
        {
            if (Tracer != null)
            {
                Tracer.Add_Trace("Feature_ItemViewer.Write_Main_Viewer_Section", "");
            }

            // Save the current viewer code
            string current_view_code = CurrentMode.ViewerCode;

            // Start the citation table
            Output.WriteLine("\t\t<!-- FEATURE VIEWER OUTPUT -->" );
            Output.WriteLine("\t\t<td align=\"left\" height=\"40px\" ><span class=\"SobekViewerTitle\"><b>Index of Features</b></span></td></tr>" );
            Output.WriteLine("\t\t<tr><td class=\"SobekDocumentDisplay\">");
            Output.WriteLine("\t\t\t<div class=\"SobekCitation\">");

            // Get the list of streets from the database
            Map_Features_DataSet features = SobekCM_Database.Get_All_Features_By_Item( CurrentItem.Web.ItemID, Tracer );
            Create_Feature_Index( Output, features );

            // Finish the citation table
            Output.WriteLine( "\t\t\t</div>"  );
            Output.WriteLine("\t\t</td>" );
            Output.WriteLine("\t\t<!-- END FEATURE VIEWER OUTPUT -->" );

            // Restore the mode
            CurrentMode.ViewerCode = current_view_code;
        }

        /// <summary> Stream to which to write the HTML for this subwriter  </summary>
        /// <param name="Output"> Response stream for the item viewer to write directly to </param>
        /// <param name="Tracer"> Trace object keeps a list of each method executed and important milestones in rendering </param>
        public override void Write_Main_Viewer_Section(TextWriter Output, Custom_Tracer Tracer)
        {
            if (Tracer != null)
            {
                Tracer.Add_Trace("EAD_Description_ItemViewer.Write_Main_Viewer_Section", "");
            }

            // Get the metadata module for EADs
            EAD_Info eadInfo = (EAD_Info)CurrentItem.Get_Metadata_Module(GlobalVar.EAD_METADATA_MODULE_KEY);

            // Build the value
            Output.WriteLine("          <td>");
            Output.WriteLine("            <div id=\"sbkEad_MainArea\">");

            if (CurrentMode.Text_Search.Length > 0)
            {
                // Get any search terms
                List<string> terms = new List<string>();
                if (CurrentMode.Text_Search.Trim().Length > 0)
                {
                    string[] splitter = CurrentMode.Text_Search.Replace("\"", "").Split(" ".ToCharArray());
                    terms.AddRange(from thisSplit in splitter where thisSplit.Trim().Length > 0 select thisSplit.Trim());
                }

                Output.Write(Text_Search_Term_Highlighter.Hightlight_Term_In_HTML(eadInfo.Full_Description, terms));
            }
            else
            {
                Output.Write(eadInfo.Full_Description);
            }

            Output.WriteLine("            </div>");
            Output.WriteLine("          </td>");
        }

        /// <summary> Gets a page from an existing digital resource, by page sequence </summary>
        /// <param name="Current_Item"> Digital resource from which to pull the current page, by sequence </param>
        /// <param name="Sequence"> Sequence for the page to retrieve from this item </param>
        /// <param name="Tracer"> Trace object keeps a list of each method executed and important milestones in rendering</param>
        /// <returns> Page tree node object for the requested page </returns>
        public static Page_TreeNode Get_Current_Page(SobekCM_Item Current_Item, int Sequence, Custom_Tracer Tracer)
        {
            if (Tracer != null)
            {
                Tracer.Add_Trace("SobekCM_Item_Factory.Get_Current_Page", "Requesting the page (by sequence) from the item");
            }

            Page_TreeNode returnValue = null;

            try
            {
                // Set the current page
                if (Sequence >= 1)
                {
                    int requested_page = Sequence - 1;
                    if ((requested_page < 0) || (requested_page > Current_Item.Web.Static_PageCount - 1))
                        requested_page = 0;

                    if (requested_page <= Current_Item.Web.Static_PageCount - 1)
                    {
                        returnValue = Current_Item.Web.Pages_By_Sequence[requested_page];
                    }
                }
            }
            catch (Exception ee)
            {
                throw new ApplicationException("Error assigning the current page sequence", ee);
            }

            return returnValue;
        }