public virtual async Task <SearchResult> SearchAsync(string term,
int?filterByCategory = null,
int languageId = -1,
PostType?postType = null,
SearchPlace searchPlace = SearchPlace.Anywhere,
SearchResultSortType orderBy = SearchResultSortType.Score,
int maxResult = 1000,
bool exactSearch = false)
{
var result = new SearchResult();
term = term.Trim();
//replace multiple spaces with a single space
RegexOptions options = RegexOptions.None;
Regex regex = new Regex("[ ]{2,}", options);
term = regex.Replace(term, " ");
if (string.IsNullOrWhiteSpace(term))
{
return(result);
}
var watch = new System.Diagnostics.Stopwatch();
watch.Start();
try
{
await Task.Run(() =>
{
using (var directory = FSDirectory.Open(new DirectoryInfo(_indexFilesPath)))
{
using (var searcher = new IndexSearcher(directory, readOnly: true))
{
var searchInFields = new List <string>();
if (searchPlace == SearchPlace.Anywhere)
{
searchInFields.AddRange(new string[] { "Title", "Description", "Keywords", "Tags" });
}
else
{
if (searchPlace.HasFlagFast(SearchPlace.Title))
{
searchInFields.Add("Title");
}
if (searchPlace.HasFlagFast(SearchPlace.Description))
{
searchInFields.Add("Description");
}
if (searchPlace.HasFlagFast(SearchPlace.Keywords))
{
searchInFields.Add("Keywords");
}
if (searchPlace.HasFlagFast(SearchPlace.Tags))
{
searchInFields.Add("Tags");
}
}
BooleanFilter filter = null;
if (languageId > -1 || filterByCategory != null || postType != null)
{
filter = new BooleanFilter();
if (languageId > -1)
{
filter.Add(new FilterClause(
new QueryWrapperFilter(new TermQuery(new Term("LanguageId", languageId.ToString()))),
Occur.MUST));
}
if (filterByCategory != null)
{
filter.Add(new FilterClause(
new QueryWrapperFilter(new TermQuery(new Term("Categories",
filterByCategory.Value.ToString()))), Occur.MUST));
}
if (postType != null)
{
filter.Add(new FilterClause(
new QueryWrapperFilter(new TermQuery(new Term("PostType",
postType.Value.ToString()))), Occur.MUST));
}
}
var currentSettings = _settingService.LoadSetting <SiteSettings>();
if (!currentSettings.EnableBlog)
{
//Filter Blog Posts if Blog is disabled
if (filter == null)
{
filter = new BooleanFilter();
}
filter.Add(new FilterClause(
new QueryWrapperFilter(new TermQuery(new Term("PostType",
PostType.BlogPost.ToString()))), Occur.MUST_NOT));
}
Sort sort = new Sort(SortField.FIELD_SCORE);
switch (orderBy)
{
case SearchResultSortType.NumberOfVisits:
sort = new Sort(new SortField("NumberOfVisit", SortField.INT, true));
break;
case SearchResultSortType.PublishDate:
sort = new Sort(new SortField("PublishDate", SortField.LONG, true));
break;
case SearchResultSortType.LastUpDate:
sort = new Sort(new SortField("LastUpDate", SortField.LONG, true));
break;
}
var analyzer = new StandardAnalyzer(Version);
var parser = new MultiFieldQueryParser(Version, searchInFields.ToArray(), analyzer);
QueryScorer scorer = null;
var hits = new List <ScoreDoc>();
Query query = null;
if (exactSearch)
{
query = ParseQuery(term, parser);
hits.AddRange(searcher.Search(query, filter, maxResult, sort).ScoreDocs);
}
else
{
query = ParseQuery($"(\"{term}\")", parser);
hits.AddRange(searcher.Search(query, filter, maxResult, sort).ScoreDocs);
query = ParseQuery($"({term.Replace(" ", "*")})", parser);
hits.AddRange(searcher.Search(query, filter, maxResult, sort).ScoreDocs);
query = ParseQuery($"(+{term.Trim().Replace(" ", " +")})", parser);
hits.AddRange(searcher.Search(query, filter, maxResult, sort).ScoreDocs);
query = ParseQuery(term, parser);
hits.AddRange(searcher.Search(query, filter, maxResult, sort).ScoreDocs);
}
scorer = new QueryScorer(query);
if (hits.Count == 0)
{
term = SearchByPartialWords(term);
query = ParseQuery(term, parser);
scorer = new QueryScorer(query);
hits.AddRange(searcher.Search(query, filter, maxResult, sort).ScoreDocs);
}
var formatter = new SimpleHTMLFormatter(
"<span class='badge badge-warning'>",
"</span>");
var fragmenter = new SimpleFragmenter(300);
var highlighter = new Highlighter(formatter, scorer)
{
TextFragmenter = fragmenter
};
foreach (var scoreDoc in hits)
{
var doc = searcher.Doc(scoreDoc.Doc);
result.Documents.Add(new SearchResultDocument()
{
DocumentId = int.Parse(doc.Get("ID")),
LanguageId = int.Parse(doc.Get("LanguageId")),
LanguageIsoCode = doc.Get("LanguageCode"),
Score = scoreDoc.Score,
DocumentTitle = GetHighlight("Title", highlighter, analyzer, doc.Get("Title"), false),
DocumentBody = GetHighlight("Description", highlighter, analyzer, doc.Get("Description"), true),
DocumentKeywords = doc.Get("Keywords"),
DocumentTags = doc.Get("Tags"),
});
}
result.Documents = result.Documents.DistinctBy(p => new { p.DocumentId })
.ToList();
analyzer.Close();
//SuggestSimilar
using (var spellDirectory = FSDirectory.Open(new DirectoryInfo(_spellFilesPath)))
{
using (var spellChecker = new SpellChecker.Net.Search.Spell.SpellChecker(spellDirectory))
{
result.SuggestSimilar.AddRange(spellChecker.SuggestSimilar(term, 10, null, null, true));
}
}
}
}
});
}
catch (Exception ex)
{
result.Error = ex;
result.HasError = true;
}
watch.Stop();
result.ElapsedMilliseconds = watch.ElapsedMilliseconds;
_eventPublisher.Publish(new SearchEvent(term, filterByCategory, languageId, postType, searchPlace, maxResult, result));
return(result);
}
public virtual SearchResult MoreLikeThis(int postId, int?filterByCategory = null, int languageId = -1, PostType?postType = null, SearchPlace searchPlace = SearchPlace.Title | SearchPlace.Description,
int maxResult = 5, SearchResultSortType orderBy = SearchResultSortType.Score)
{
var result = new SearchResult();
var watch = new System.Diagnostics.Stopwatch();
watch.Start();
try
{
using (var directory = FSDirectory.Open(new DirectoryInfo(_indexFilesPath)))
{
using (var searcher = new IndexSearcher(directory, readOnly: true))
{
var docNumber = GetLuceneDocNumber(postId, searcher);
if (docNumber == -1)
{
return(result);
}
var searchInFields = new List <string>();
if (searchPlace == SearchPlace.Anywhere)
{
searchInFields.AddRange(new string[] { "Title", "Description", "Keywords", "Tags" });
}
else
{
if (searchPlace.HasFlagFast(SearchPlace.Title))
{
searchInFields.Add("Title");
}
if (searchPlace.HasFlagFast(SearchPlace.Description))
{
searchInFields.Add("Description");
}
if (searchPlace.HasFlagFast(SearchPlace.Keywords))
{
searchInFields.Add("Keywords");
}
if (searchPlace.HasFlagFast(SearchPlace.Tags))
{
searchInFields.Add("Tags");
}
}
var analyzer = new StandardAnalyzer(Version);
var moreLikeThis = new MoreLikeThis(searcher.IndexReader)
{
Analyzer = analyzer
};
moreLikeThis.SetFieldNames(searchInFields.ToArray());
moreLikeThis.MinDocFreq = 1;
moreLikeThis.MinTermFreq = 1;
moreLikeThis.Boost = true;
var query = moreLikeThis.Like(docNumber);
var filter = new BooleanFilter();
filter.Add(new FilterClause(
new QueryWrapperFilter(new TermQuery(new Term("ID",
postId.ToString()))),
Occur.MUST_NOT));
if (languageId > -1)
{
filter.Add(new FilterClause(
new QueryWrapperFilter(new TermQuery(new Term("LanguageId",
languageId.ToString()))),
Occur.MUST));
}
if (filterByCategory != null)
{
filter.Add(new FilterClause(
new QueryWrapperFilter(new TermQuery(new Term("Categories",
filterByCategory.Value.ToString()))), Occur.MUST));
}
if (postType != null)
{
filter.Add(new FilterClause(
new QueryWrapperFilter(new TermQuery(new Term("PostType",
postType.Value.ToString()))), Occur.MUST));
}
Sort sort = new Sort(SortField.FIELD_SCORE);
switch (orderBy)
{
case SearchResultSortType.NumberOfVisits:
sort = new Sort(new SortField("NumberOfVisit", SortField.INT, true));
break;
case SearchResultSortType.PublishDate:
sort = new Sort(new SortField("PublishDate", SortField.LONG, true));
break;
case SearchResultSortType.LastUpDate:
sort = new Sort(new SortField("LastUpDate", SortField.LONG, true));
break;
}
var hits = searcher.Search(query, filter, maxResult, sort).ScoreDocs;
foreach (var scoreDoc in hits)
{
var doc = searcher.Doc(scoreDoc.Doc);
result.Documents.Add(new SearchResultDocument()
{
DocumentId = int.Parse(doc.Get("ID")),
LanguageId = int.Parse(doc.Get("LanguageId")),
LanguageIsoCode = doc.Get("LanguageCode"),
Score = scoreDoc.Score,
DocumentTitle = doc.Get("Title"),
DocumentBody = doc.Get("Description"),
DocumentKeywords = doc.Get("Keywords"),
DocumentTags = doc.Get("Tags"),
});
}
result.Documents = result.Documents.DistinctBy(p => new { p.DocumentId })
.ToList();
analyzer.Close();
}
}
}
catch (Exception ex)
{
result.Error = ex;
result.HasError = true;
}
watch.Stop();
result.ElapsedMilliseconds = watch.ElapsedMilliseconds;
return(result);
}