private static IEnumerable <Offer> _search(string searchQuery, string searchField = "")
{
// validation
if (string.IsNullOrEmpty(searchQuery.Replace("*", "").Replace("?", "")))
{
return(new List <Offer>());
}
// set up lucene searcher
using (var searcher = new IndexSearcher(_directory, true))
{
var hits_limit = 1000;
//var analyzer = new StandardAnalyzer(Version.LUCENE_30);
var analyzer = new SnowballAnalyzer(Lucene.Net.Util.Version.LUCENE_30, "English", StopAnalyzer.ENGLISH_STOP_WORDS_SET);
searcher.SetDefaultFieldSortScoring(true, true);
// search by single field
if (!string.IsNullOrEmpty(searchField))
{
var parser = new QueryParser(Version.LUCENE_30, searchField, analyzer);
var query = parseQuery(searchQuery, parser);
var hits = searcher.Search(query, hits_limit).ScoreDocs;
var results = _mapLuceneToOfferList(hits, searcher);
analyzer.Close();
searcher.Dispose();
return(results);
}
// search by multiple fields (ordered by RELEVANCE)
else
{
var parser = new MultiFieldQueryParser(Version.LUCENE_30, _fields.Keys.ToArray(), analyzer);
var query = parseQuery(searchQuery, parser);
var hits = searcher.Search(query, null, hits_limit, Sort.RELEVANCE).ScoreDocs;
var results = _mapLuceneToOfferList(hits, searcher);
analyzer.Close();
searcher.Dispose();
return(results);
}
}
}
public static void AddUpdateLuceneIndex(IEnumerable <Offer> offers)
{
// init lucene
//var analyzer = new StandardAnalyzer(Version.LUCENE_30);
var analyzer = new SnowballAnalyzer(Lucene.Net.Util.Version.LUCENE_30, "English", StopAnalyzer.ENGLISH_STOP_WORDS_SET);
using (var writer = new IndexWriter(_directory, analyzer, IndexWriter.MaxFieldLength.UNLIMITED))
{
// add data to lucene search index (replaces older entry if any)
foreach (var offer in offers)
{
_addToLuceneIndex(offer, writer);
}
// close handles
analyzer.Close();
writer.Dispose();
}
}