/V2/trunk/RI/Desktop/StockTraderRI.Modules.WatchList/Services/WatchListService.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.ObjectModel;

using System.Globalization;

using System.Windows.Input;

using Microsoft.Practices.Composite.Presentation.Commands;

using StockTraderRI.Infrastructure.Interfaces;



namespace StockTraderRI.Modules.Watch.Services

{

    public class WatchListService : IWatchListService

    {

        private readonly IMarketFeedService marketFeedService;



        private ObservableCollection<string> WatchItems { get; set; }



        public WatchListService(IMarketFeedService marketFeedService)

        {

            this.marketFeedService = marketFeedService;

            WatchItems = new ObservableCollection<string>();



            AddWatchCommand = new DelegateCommand<string>(AddWatch);

        }



        public ObservableCollection<string> RetrieveWatchList()

        {

            return WatchItems;

        }



        private void AddWatch(string tickerSymbol)

        {

            if (!String.IsNullOrEmpty(tickerSymbol))

            {

                string upperCasedTrimmedSymbol = tickerSymbol.ToUpper(CultureInfo.InvariantCulture).Trim();

                if (!WatchItems.Contains(upperCasedTrimmedSymbol))

                {

                    if (marketFeedService.SymbolExists(upperCasedTrimmedSymbol))

                    {

                        WatchItems.Add(upperCasedTrimmedSymbol);

                    }

                }

            }

        }



        public ICommand AddWatchCommand { get; set; }

    }

}