/// <summary>
/// Gets stock data using a Yql query
/// </summary>
/// <param name="symbols"></param>
/// <returns></returns>
public IEnumerable <StockData> GetStockData(IEnumerable <string> symbols)
{
// if no stocks provided, return empty list
if (symbols == null)
{
return(new List <StockData>());
}
// enumerate and check count; if no stocks provided, return empty list
var symbolList = symbols as IList <string> ?? symbols.ToList();
if (symbolList.Count == 0)
{
return(new List <StockData>());
}
// get url for query
var queryUrl = _urlProvider.GetStockUrl(symbolList);
if (string.IsNullOrWhiteSpace(queryUrl))
{
throw new QueryUrlNotProvidedException();
}
// get results of query
var results = _webRequestExecutor.ExecuteRequest(queryUrl);
if (string.IsNullOrWhiteSpace(results))
{
throw new QueryResultsAreEmptyException();
}
// interpret response and return
return(_stockDataResultTranslator.TranslateResultsToStockData(results));
}