/// <summary>
/// Analyze the content of the XML data freshly fetched from
/// the Site and return a FrontPage filled with all the required information.
/// The method does not process the Articles.
/// </summary>
/// <param name="s">The Site from which the XML data has been collected</param>
/// <param name="navigator">The XPathNavigator set to explore the XML data</param>
/// <returns>A fully filled FrontPage object, without Articles.</returns>
protected override FrontPage CreateFrontPage(Site s, XPathNavigator navigator)
{
// Create the front page with the default values
FrontPage output = new FrontPage(s.Guid);
UpdateTitle(output, navigator);
UpdateCaption(output, navigator);
UpdateUri(output, navigator);
return output;
}
public RegularFrontPagePanel(FrontPage fp)
{
frontPage = fp;
InitializeComponent();
titleControl.Text = fp.Title;
captionControl.Text = fp.Caption;
SizeChanged += RegularFrontPagePanel_SizeChanged;
Disposed += RegularFrontPagePanel_Disposed;
}
/// <summary>
/// Updates the content of this front page with
/// the content of the front page specified in argument.
/// Warning: the articles are not procesed.
/// </summary>
/// <param name="fp"></param>
/// <returns>true is any field in this frontpage has been changed because of the update. false otherwise (implies that this front page and the one in argument has similar content).</returns>
public bool Update(FrontPage fp)
{
bool output = false;
if (this.Site != fp.Site)
{
throw new ArgumentException();
}
if (string.Compare(this.title, fp.title) != 0)
{
this.title = fp.title;
output = true;
}
if (string.Compare(this.caption, fp.caption) != 0)
{
this.caption = fp.caption;
output = true;
}
if (Toolkit.Equals(this.uri, fp.uri)==false)
{
this.uri = fp.uri;
output = true;
}
return output;
}
public bool IsSimilarTo(FrontPage fp)
{
return this.Site == fp.Site;
}
private void Update(TreeNode tn, FrontPage fp)
{
StringBuilder text = new StringBuilder();
text.Append(fp.Title);
if (string.IsNullOrEmpty(fp.Caption) == false)
{
text.AppendFormat(" [{0}]", fp.Caption);
}
tn.Text = text.ToString();
Touch(tn, fp);
}
private void Touch(TreeNode tn, FrontPage fp)
{
}
private TreeNode FindOrCreateNode(FrontPage fp)
{
TreeNode siteNode = FindOrCreateRoot(fp.Site);
foreach (TreeNode tn in siteNode.Nodes)
{
Guid id = (Guid)tn.Tag;
if (id.CompareTo(fp.Guid) == 0)
{
return tn;
}
}
TreeNode newTn = new TreeNode();
Update(newTn, fp);
newTn.Tag = fp.Guid;
newTn.ImageKey = "frontpage.png";
newTn.SelectedImageKey = "frontpage.png";
siteNode.Nodes.Add(newTn);
return newTn;
}
private FrontPage TouchOrUpdate(FrontPage newFp)
{
FrontPage fp = FindOrAdd(newFp);
if (fp.Update(newFp) == true)
{
if (FrontPageUpdated != null)
{
FrontPageUpdated(fp, EventArgs.Empty);
}
}
else
{
if (FrontPageTouched != null)
{
FrontPageTouched(fp, EventArgs.Empty);
}
}
return fp;
}
public static Site FindSiteOf(FrontPage fp)
{
return FindSite(fp.Site);
}
/// <summary>
/// Check in the database if an article similar to "newA"
/// already exists. If the answer is "yes", then the article
/// from the database is returned. If the answer is "no", then
/// the provided article is added into the database and returned
/// to the caller.
/// </summary>
/// <param name="fp"></param>
/// <param name="newA"></param>
/// <returns></returns>
private Article FindOrAdd(FrontPage fp, Article newA)
{
foreach (Article a in fp.Articles)
{
if (a.IsSimilarTo(newA) == true)
{
return a;
}
}
newA = (Article)newA.Clone();
fp.Add(newA);
if (ArticleAdded != null)
{
ArticleAdded(newA, EventArgs.Empty);
}
return newA;
}
/// <summary>
/// Check in the database if a front page similar to "newFp"
/// already exists. If the answer is "yes", then the front page
/// from the database is returned. If the answer is "no", then
/// the provided frontpage is added into the database and returned
/// to the caller.
/// </summary>
/// <param name="fp"></param>
/// <returns></returns>
private FrontPage FindOrAdd(FrontPage newFp)
{
foreach (FrontPage fp in frontPages)
{
if( fp.IsSimilarTo(newFp) == true )
{
return fp;
}
}
newFp = (FrontPage)newFp.Clone();
frontPages.Add(newFp);
if (FrontPageAdded != null)
{
FrontPageAdded(newFp, EventArgs.Empty);
}
return newFp;
}
private void Backup(FrontPage fp, XmlTextWriter w)
{
w.WriteStartElement("site");
w.WriteAttributeString("guid", fp.Site.ToString());
// FRONT PAGE
fp.ToXML(w);
// ARTICLES
foreach (Article a in fp.Articles)
{
a.ToXML(w);
}
w.WriteEndElement();
}
/// <summary>
///
/// </summary>
/// <param name="newFp"></param>
/// <returns>A list of articles (withing the given frontpage) that have not been updated or touched.</returns>
public List<Article> Push(FrontPage newFp)
{
List<Article> untouched = new List<Article>();
lock (_lock_)
{
//- - - - - - - - - - - - -
// PUSH/UPDATE FRONT PAGE
//- - - - - - - - - - - - -
FrontPage fp = TouchOrUpdate(newFp);
fp.Pushed();
//- - - - - - - - - - - -
// PUSH/UPDATE ARTICLES
//- - - - - - - - - - - -
untouched.AddRange(fp.Articles);
foreach (Article newA in newFp.Articles)
{
Article a = TouchOrUpdate(newA);
a.Pushed();
untouched.Remove(a);
}
}
return untouched;
}
private void UpdateUri(FrontPage fp, XPathNavigator navigator)
{
string[] patterns = new string[]
{
"/rss/channel/link", // rss
"/atom:feed/atom:link/@href" // atom
};
foreach (string pattern in patterns)
{
try
{
fp.Uri = new Uri(XmlFetcher.GetSingleValue(navigator, pattern, xmlnsManager));
return;
}
catch
{
}
}
}
private void UpdateTitle(FrontPage fp, XPathNavigator navigator)
{
string[] patterns = new string[]
{
"/rss/channel/title", // rss
"/atom:feed/atom:title" // atom
};
foreach (string pattern in patterns)
{
try
{
fp.Title = XmlFetcher.GetSingleValue(navigator, pattern, xmlnsManager);
return;
}
catch
{
}
}
}
private FrontPage(FrontPage src)
: base(src)
{
Update(src);
}
/// <summary>
/// Warning: does not clone the list of articles (and that's made on purpose!)
/// </summary>
/// <returns></returns>
public object Clone()
{
FrontPage clone = new FrontPage(this);
//clone.Update(this);
return clone;
}
private void LoadSite(Guid siteId, XmlReader input)
{
while (input.Read())
{
if (input.NodeType == XmlNodeType.Element)
{
if (input.Name == "frontpage")
{
using (XmlReader subTree = input.ReadSubtree())
{
FrontPage newFp = new FrontPage(siteId, subTree);
TouchOrUpdate(newFp);
}
}
else if (input.Name == "article")
{
using (XmlReader subTree = input.ReadSubtree())
{
Article a = new Article(siteId, subTree);
TouchOrUpdate(a);
}
}
}
}
}
