/V4/StockTrader RI/Desktop/StockTraderRI.Modules.Market/Services/MarketHistoryService.cs

//===================================================================================

// Microsoft patterns & practices

// Composite Application Guidance for Windows Presentation Foundation and Silverlight

//===================================================================================

// Copyright (c) Microsoft Corporation.  All rights reserved.

// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY

// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT

// LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND

// FITNESS FOR A PARTICULAR PURPOSE.

//===================================================================================

// The example companies, organizations, products, domain names,

// e-mail addresses, logos, people, places, and events depicted

// herein are fictitious.  No association with any real company,

// organization, product, domain name, email address, logo, person,

// places, or events is intended or should be inferred.

//===================================================================================

using System;

using System.Collections.Generic;

using System.Globalization;

using System.Linq;

using System.Xml.Linq;

using StockTraderRI.Infrastructure.Interfaces;

using StockTraderRI.Infrastructure.Models;

using StockTraderRI.Modules.Market.Properties;

using System.ComponentModel.Composition;



namespace StockTraderRI.Modules.Market.Services

{

    [Export(typeof(IMarketHistoryService))]

    [PartCreationPolicy(CreationPolicy.Shared)]

    public class MarketHistoryService : IMarketHistoryService

    {

        private Dictionary<string, MarketHistoryCollection> _marketHistory;



        public MarketHistoryService()

        {

            InitializeMarketHistory();

        }



        private void InitializeMarketHistory()

        {

            XDocument document = XDocument.Parse(Resources.MarketHistory);



            _marketHistory = document.Descendants("MarketHistoryItem")

                .GroupBy(x => x.Attribute("TickerSymbol").Value,

                         x => new MarketHistoryItem

                                  {

                                      DateTimeMarker = DateTime.Parse(x.Attribute("Date").Value, CultureInfo.InvariantCulture),

                                      Value = Decimal.Parse(x.Value, NumberStyles.Float, CultureInfo.InvariantCulture)

                                  })

                .ToDictionary(group => group.Key, group => new MarketHistoryCollection(group));

        }



        public MarketHistoryCollection GetPriceHistory(string tickerSymbol)

        {

            MarketHistoryCollection items = _marketHistory[tickerSymbol];

            return items;

        }

    }

}