/// <summary>
/// Initiate a remote (web) search using the engine incl. search expression specified
/// by searchFeedUrl. We assume, the specified Url will return a RSS feed.
/// This can be used e.g. to get a RSS search result from feedster.
/// </summary>
/// <param name="searchFeedUrl">Complete Url of the search engine incl. search expression</param>
/// <param name="tag">optional, can be used by the caller</param>
public void SearchRemoteFeed(string searchFeedUrl, object tag)
{
var unreturnedMatchItems = new List <INewsItem>(1);
try
{
unreturnedMatchItems = RssParser.DownloadItemsFromFeed(searchFeedUrl);
}
catch (Exception remoteSearchException)
{
unreturnedMatchItems.Add(FeedSource.CreateHelpNewsItemFromException(remoteSearchException));
}
int feedmatches = 1;
int itemmatches = unreturnedMatchItems.Count;
var fi =
new FeedInfo(String.Empty, String.Empty, unreturnedMatchItems, String.Empty, String.Empty, String.Empty,
new Dictionary <XmlQualifiedName, string>(), String.Empty);
var fil = new FeedInfoList(String.Empty)
{
fi
};
RaiseSearchFinishedEvent(tag, fil, feedmatches, itemmatches);
}
/// <summary>
/// Search for NewsItems, that match a provided criteria collection within a optional search scope.
/// </summary>
/// <param name="criteria">SearchCriteriaCollection containing the defined search criteria</param>
/// <param name="scope">Search scope: an array of NewsFeed</param>
/// <param name="tag">optional object to be used by the caller to identify this search</param>
/// <param name="cultureName">Name of the culture.</param>
/// <param name="returnFullItemText">if set to <c>true</c>, full item texts are returned instead of the summery.</param>
public void SearchNewsItems(SearchCriteriaCollection criteria, INewsFeed[] scope, object tag, string cultureName,
bool returnFullItemText)
{
// if scope is an empty array: search all, else search only in spec. feeds
int feedmatches = 0;
int itemmatches = 0;
IList <INewsItem> unreturnedMatchItems = new List <INewsItem>();
var fiList = new FeedInfoList(String.Empty);
Exception ex;
bool valid = SearchHandler.ValidateSearchCriteria(criteria, cultureName, out ex);
if (ex != null) // report always any error (warnings)
{
// render the error in-line (search result):
fiList.Add(FeedSource.CreateHelpNewsItemFromException(ex).FeedDetails);
feedmatches = fiList.Count;
unreturnedMatchItems = fiList.GetAllNewsItems();
itemmatches = unreturnedMatchItems.Count;
}
if (valid)
{
try
{
// do the search (using lucene):
LuceneSearch.Result r = SearchHandler.ExecuteSearch(criteria, scope,
this.Sources.Select(entry => entry.Source), cultureName);
// we iterate r.ItemsMatched to build a
// NewsItemIdentifier and ArrayList list with items, that
// match the read status (if this was a search criteria)
// then call FindNewsItems(NewsItemIdentifier[]) to get also
// the FeedInfoList.
// Raise ONE event, instead of two to return all (counters, lists)
SearchCriteriaProperty criteriaProperty = null;
foreach (ISearchCriteria sc in criteria)
{
criteriaProperty = sc as SearchCriteriaProperty;
if (criteriaProperty != null &&
PropertyExpressionKind.Unread == criteriaProperty.WhatKind)
{
break;
}
}
ItemReadState readState = ItemReadState.Ignore;
if (criteriaProperty != null)
{
readState = criteriaProperty.BeenRead ? ItemReadState.BeenRead : ItemReadState.Unread;
}
if (r != null && r.ItemMatchCount > 0)
{
/* append results */
var nids = new SearchHitNewsItem[r.ItemsMatched.Count];
r.ItemsMatched.CopyTo(nids, 0);
//look in every feed source to find source feed for matching news items
IEnumerable <FeedInfoList> results = Sources.Select(entry => entry.Source.FindNewsItems(nids, readState, returnFullItemText));
foreach (FeedInfoList fil in results)
{
fiList.AddRange(fil);
}
feedmatches = fiList.Count;
unreturnedMatchItems = fiList.GetAllNewsItems();
itemmatches = unreturnedMatchItems.Count;
}
}
catch (Exception searchEx)
{
// render the error in-line (search result):
fiList.Add(FeedSource.CreateHelpNewsItemFromException(searchEx).FeedDetails);
feedmatches = fiList.Count;
unreturnedMatchItems = fiList.GetAllNewsItems();
itemmatches = unreturnedMatchItems.Count;
}
}
RaiseSearchFinishedEvent(tag, fiList, unreturnedMatchItems, feedmatches, itemmatches);
}