public static IEnumerable<LuceneSearchEO> Search(LuceneSearchType searchType, string input, string fieldName = "")
{
if (string.IsNullOrEmpty(input)) return new List<LuceneSearchEO>();
string[] temrs = input.Split(new string[] { " " }, StringSplitOptions.RemoveEmptyEntries);
input = string.Empty;
foreach (var item in temrs)
input += "+" + item + " ";
return _search(searchType, input.Trim(), fieldName);
}
public static IEnumerable<LuceneSearchEO> GetAllIndexRecords(LuceneSearchType searchType)
{
string _luceneDir = getLuceneDirectory(searchType);
if (!System.IO.Directory.EnumerateFiles(_luceneDir).Any()) return new List<LuceneSearchEO>();
// set up lucene searcher
var searcher = new IndexSearcher(getFSDirectory(searchType), false);
var reader = IndexReader.Open(getFSDirectory(searchType), false);
var docs = new List<Document>();
var term = reader.TermDocs();
// v 2.9.4: use 'term.Doc()'
// v 3.0.3: use 'term.Doc'
while (term.Next()) docs.Add(searcher.Doc(term.Doc));
reader.Dispose();
searcher.Dispose();
return _mapLuceneToDataList(docs);
}
private static IEnumerable<LuceneSearchEO> _search(LuceneSearchType searchType, string searchQuery, string searchField = "")
{
// validation
if (string.IsNullOrEmpty(searchQuery.Replace("*", "").Replace("?", ""))) return new List<LuceneSearchEO>();
// set up lucene searcher
using (var searcher = new IndexSearcher(getFSDirectory(searchType), false))
{
var hits_limit = 20;
var analyzer = new StandardAnalyzer(Version.LUCENE_30);
// 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 = _mapLuceneToDataList(hits, searcher);
analyzer.Close();
searcher.Dispose();
return results;
}
// search by multiple fields (ordered by RELEVANCE)
else
{
string[] fields = getLuceneSearchEOFields();
var parser = new MultiFieldQueryParser
(Version.LUCENE_30, fields, analyzer);
var query = parseQuery(searchQuery, parser);
var hits = searcher.Search(query, null, hits_limit, Sort.INDEXORDER).ScoreDocs;
var results = _mapLuceneToDataList(hits, searcher);
analyzer.Close();
searcher.Dispose();
return results;
}
}
}
public static bool ClearLuceneIndex(LuceneSearchType searchType)
{
try
{
var analyzer = new StandardAnalyzer(Version.LUCENE_30);
using (var writer = new IndexWriter(getFSDirectory(searchType), analyzer, true, IndexWriter.MaxFieldLength.UNLIMITED))
{
// remove older index entries
writer.DeleteAll();
// close handles
analyzer.Close();
writer.Dispose();
}
}
catch (Exception)
{
return false;
}
return true;
}
public static void Optimize(LuceneSearchType searchType)
{
var analyzer = new StandardAnalyzer(Version.LUCENE_30);
using (var writer = new IndexWriter(getFSDirectory(searchType), analyzer, IndexWriter.MaxFieldLength.UNLIMITED))
{
analyzer.Close();
writer.Optimize();
writer.Dispose();
}
}
public static void ClearLuceneIndexRecord(LuceneSearchType searchType, int record_id)
{
// init lucene
var analyzer = new StandardAnalyzer(Version.LUCENE_30);
using (var writer = new IndexWriter(getFSDirectory(searchType), analyzer, IndexWriter.MaxFieldLength.UNLIMITED))
{
LuceneSearchEO LuceneSearchEO = new LuceneSearchEO();
PropertyInfo[] props = LuceneSearchEO.GetType().GetProperties();
foreach (var prop in props)
{
Attribute att = prop.GetCustomAttribute(typeof(LuceneTypeAttribute));
LuceneTypeAttribute luceneAtt = (LuceneTypeAttribute)att;
if (luceneAtt != null && luceneAtt.Key)
{
// remove older index entry
var searchQuery = new TermQuery(new Term(prop.Name, record_id.ToString()));
writer.DeleteDocuments(searchQuery);
}
}
// close handles
analyzer.Close();
writer.Dispose();
}
}
private static FSDirectory getFSDirectory(LuceneSearchType searchType)
{
string _luceneDir = getLuceneDirectory(searchType);
FSDirectory _directoryTemp = FSDirectory.Open(new DirectoryInfo(_luceneDir));
if (IndexWriter.IsLocked(_directoryTemp)) IndexWriter.Unlock(_directoryTemp);
var lockFilePath = Path.Combine(_luceneDir, "write.lock");
if (File.Exists(lockFilePath)) File.Delete(lockFilePath);
return _directoryTemp;
}
public static void AddUpdateLuceneIndex(LuceneSearchType searchType, IEnumerable<LuceneSearchEO> LuceneSearchEOs)
{
string _luceneDir = getLuceneDirectory(searchType);
// init lucene
var analyzer = new StandardAnalyzer(Version.LUCENE_30);
using (var writer = new IndexWriter(getFSDirectory(searchType), analyzer, IndexWriter.MaxFieldLength.UNLIMITED))
{
// add data to lucene search index (replaces older entries if any)
foreach (var LuceneSearchEO in LuceneSearchEOs) _addToLuceneIndex(LuceneSearchEO, writer);
// close handles
analyzer.Close();
writer.Dispose();
}
}
public static void AddUpdateLuceneIndex(LuceneSearchType searchType, LuceneSearchEO LuceneSearchEO)
{
AddUpdateLuceneIndex(searchType, new List<LuceneSearchEO> { LuceneSearchEO });
}
private static string getLuceneDirectory(LuceneSearchType searchType)
{
string lucenePath = HttpContext.Current.Request.PhysicalApplicationPath + "Lucene_Index\\";
DirectoryInfo diLucenePath = new DirectoryInfo(lucenePath);
if (!diLucenePath.Exists)
diLucenePath.Create();
string _luceneDir = Path.Combine(lucenePath + searchType.ToString() + "_index");
diLucenePath = new DirectoryInfo(_luceneDir);
if (!diLucenePath.Exists)
diLucenePath.Create();
return _luceneDir;
}
