Init

Helper/FeedSerializer.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.IO;
+using System.Windows.Media;
+using MarketData.Utils;
+using Ticker.Models;
+//  Author:Sean Kessler
+namespace Ticker.Helper
+{
+  public class FeedSerializer
+  {
+    private FeedSerializer()
+    {
+    }
+    public static List<FeedItem> Deserialize(String strPathFileName)
+    {
+      List<FeedItem> feedItems=new List<FeedItem>();
+      if(!File.Exists(strPathFileName))return feedItems;
+      String strLine=null;
+
+      if(!IsCacheCurrent(strPathFileName,DateTime.Now))
+      {
+        RemoveCache(strPathFileName);
+        return feedItems;
+      }
+      StreamReader streamReader=new StreamReader(new FileStream(strPathFileName,FileMode.Open));
+      DateTime cacheDate=new NVP(streamReader.ReadLine()).Get<DateTime>();
+      while(null!=(strLine=streamReader.ReadLine()))
+      {
+        if("".Equals(strLine))continue;
+        FeedItem feedItem=FeedItem.FromString(strLine);
+        if(null==feedItem)continue;
+        feedItems.Add(feedItem);
+      }
+      streamReader.Close();
+      streamReader.Dispose();
+      return feedItems;
+    }
+    public static bool Serialize(String strPathFileName,DateTime feedDate,List<FeedItem> feedsList)
+    {
+      try
+      {
+        if(File.Exists(strPathFileName))File.Delete(strPathFileName);
+        StreamWriter streamWriter=new StreamWriter(new FileStream(strPathFileName,FileMode.CreateNew));
+        streamWriter.WriteLine(new NVP("CacheDate",feedDate.ToShortDateString()).ToString());
+        foreach(FeedItem feedItem in feedsList)
+        {
+          String strLine=feedItem.ToNVPCollection().ToString();
+          if(null==strLine||"".Equals(strLine))continue;
+          streamWriter.WriteLine(strLine);
+        }
+        streamWriter.Flush();
+        streamWriter.Close();
+        streamWriter.Dispose();
+        return true;
+      }
+      catch(Exception)
+      {
+        return false;
+      }
+    }
+    public static bool Serialize(String strPathFileName,DateTime feedDate,FeedItem feedItem)
+    {
+      try
+      {
+        StreamWriter streamWriter=null;
+        String strLine=feedItem.ToNVPCollection().ToString();
+        if(null==strLine||"".Equals(strLine))return false;
+        if(!File.Exists(strPathFileName))
+        {
+          streamWriter=new StreamWriter(new FileStream(strPathFileName,FileMode.CreateNew));
+          streamWriter.WriteLine(new NVP("CacheDate",feedDate.ToShortDateString()).ToString());
+        }
+        else 
+        {
+          streamWriter=new StreamWriter(new FileStream(strPathFileName,FileMode.Append));
+        }
+        streamWriter.WriteLine(strLine);
+        streamWriter.Flush();
+        streamWriter.Close();
+        streamWriter.Dispose();
+        return true;
+      }
+      catch(Exception)
+      {
+        return false;
+      }
+    }
+    private static bool IsCacheCurrent(String strPathFileName,DateTime feedDate)
+    {
+      try
+      {
+        if(!File.Exists(strPathFileName))return false;
+        StreamReader streamReader=new StreamReader(new FileStream(strPathFileName,FileMode.Open));
+        DateTime cacheDate=new NVP(streamReader.ReadLine()).Get<DateTime>();
+        streamReader.Close();
+        return feedDate.Date.Equals(cacheDate.Date);
+      }
+      catch(Exception)
+      {
+        return false;
+      }
+    }
+    private static void RemoveCache(String strPathFileName)
+    {
+      try
+      {
+        if(File.Exists(strPathFileName))File.Delete(strPathFileName);
+      }
+      catch(Exception)
+      {
+      }
+    }
+  }
+}