/// <summary>
/// Removes feedItems for a given feed from the list of feedItems.
/// </summary>
/// <param name="feed">The feed for which the articles should be removed</param>
private void RemoveFeedItems(Feed feed)
{
var counter = 0;
foreach (var article in feed.Items)
{
while (counter < FeedItems.Count && FeedItems[counter].Link != article.Link)
{
counter++;
}
if (counter == FeedItems.Count)
{
break;
}
else
{
FeedItems.RemoveAt(counter);
if (counter > 0)
{
counter--;
}
}
}
// ReSharper Disable All
OnPropertyChanged("HasFeedItems");
// ReSharper Restore All
}
public (string Title, List <Article> Articles) Fetch(string feed)
{
try
{
var feedId = feed.Md5();
SyndicationFeed sf = null;
string title = null;
CodeHollow.FeedReader.Feed cfeed = null;
try
{
sf = SyndicationFeed.Load(XmlReader.Create(feed));
title = sf?.Title?.Text;
}
catch
{
cfeed = CodeHollow.FeedReader.FeedReader.ReadAsync(feed).Result;
title = cfeed?.Title;
}
if (string.IsNullOrWhiteSpace(title))
{
this.logger.LogWarning($"The title of feed({feed}) is null or white space.");
return(null, null);
}
using (var connection = this.helper.GetDbConnection())
{
if (sf != null)
{
return(title, this.helper.ParseArticles(sf, feedId, connection));
}
else
{
return(title, this.helper.ParseArticles(cfeed, feedId, connection));
}
}
}
catch (Exception e)
{
this.logger.LogError(e, $"failed to add {feed}");
}
return(null, null);
}
/// <summary>
/// Removes a feed from the list of feeds.
/// After that the articles from that feed are also removed from the list of articles.
/// </summary>
/// <param name="url">URL of the feed to be removed</param>
public void RemoveFeed(string url)
{
Feed feedToBeRemoved = null;
for (var i = 0; i < RssFeeds.Count; i++)
{
if (RssFeeds[i].Link == url)
{
feedToBeRemoved = RssFeeds[i];
RssFeeds.Remove(feedToBeRemoved);
}
}
if (feedToBeRemoved == null)
{
return;
}
RemoveFeedItems(feedToBeRemoved);
}
public List <Article> ParseArticles(CodeHollow.FeedReader.Feed feed, string feedId, IDbConnection connection)
{
if (feed == null || feed.Items == null || !feed.Items.Any())
{
NiologManager.CreateLogger().Warn()
.Message("Feed is empty, so no articles.")
.Write();
return(null);
}
var articleDao = new ArticleDao(connection);
var articles = new List <Article>();
foreach (var item in feed.Items)
{
var articleUrl = item?.Link;
var articleTitle = item?.Title;
if (string.IsNullOrWhiteSpace(articleUrl) || string.IsNullOrWhiteSpace(articleTitle))
{
continue;
}
var articleId = feedId + articleUrl.Md5();
var content = this.Simplify(item.Content);
Article article = new Article
{
Id = articleId,
Url = articleUrl,
FeedId = feedId,
Title = articleTitle,
Summary = content,
Published = item.PublishingDate ?? DateTime.Now,
Updated = item.PublishingDate ?? DateTime.Now,
Keyword = string.Join(',', item.Categories),
Content = content,
Contributors = item.Author,
Authors = item.Author
};
articles.Add(article);
try
{
if (articleDao.GetArticle(articleId) == null)
{
articleDao.InsertArticle(article);
}
else
{
articleDao.UpdateArticle(article);
}
}
catch (Exception e)
{
NiologManager.CreateLogger().Error()
.Message($"error occured when insert {articleUrl}")
.Exception(e)
.Write();
}
}
return(articles);
}
