public static Headline[] ExtractHeadlines(NewsSource newsSource, string rawData)
{
switch (newsSource.DataFormat)
{
case DataFormat.Rss:
var xmlDoc = XDocument.Parse(rawData);
return (from channel in xmlDoc.Root.Elements("channel")
from item in channel.Elements("item")
select new Headline(newsSource, item.Element("title").Value)).ToArray();
case DataFormat.TwitterJson:
var javaScriptObject = (IEnumerable)new JavaScriptSerializer().DeserializeObject(rawData);
return (from tweetInfo in javaScriptObject.Cast<IDictionary<string, object>>()
select new Headline(newsSource, (string)tweetInfo["text"])).ToArray();
default:
return null;
}
}
public Headline(NewsSource source, string headlineText)
{
Source = source;
HeadlineText = headlineText;
}
private async Task<Headline[]> FetchHeadlinesTaskAsync(NewsSource newsSource)
{
string rawData = await new WebClient().DownloadStringTaskAsync(newsSource.Url);
return ParserUtils.ExtractHeadlines(newsSource, rawData);
}
