/// <summary>
/// Build a basic index writer for the index located at the given index path.
/// </summary>
/// <param name="indexDirectoryPath">The directory of the index.</param>
/// <returns>Default <see cref="IndexWriter"/> object </returns>
private IndexWriter BuildIndexWriter(string indexDirectoryPath)
{
// the index directoryFactory
var fsDirectory = _directoryFactory.GetDirectory(indexDirectoryPath);
// the index analyzer
var baseAnalyzer = _analyzerFactory.GetAnalyzer();
// the actual index writter
var indexWriter = _indexWriterFactory.BuildIndexWritter(fsDirectory, baseAnalyzer);
return(indexWriter);
}
public SingleFieldSearchResult SingleFieldSearch(string fieldName, string query, string directoryPath)
{
// Create the index reader
var directory = _directoryFactory.GetDirectory(directoryPath);
var indexReader = _indexReaderFactorty.GetIndexReader(directory);
// create a index searcher
var searcher = _indexSearcherFactory.GetIndexSearcher(indexReader);
// Create the query to be executed
var contentQuery = _singleFieldQueryFactory.GetSingleFieldQuery(fieldName,
query,
_analyzerFactory.GetAnalyzer());
// Execute the query.
var results = _simpleQueryExecutor.ExecuteQuery(contentQuery, searcher, indexReader);
// Create the SingleFieldSearchResul wrapper and return it as the result of the search
var resultWrapper = new SingleFieldSearchResult(searcher)
{
TopDocs = results
};
return(resultWrapper);
}
public StandardSearchResultsList Query(string searchTerm)
{
searchTerm = searchTerm.ToLowerInvariant().Trim();
var ngramSearchTerms = TokenizeQuery(new EdgeNGramAnalyzer(), searchTerm);
var boolQuery = new BooleanQuery();
//phrase
boolQuery.Add(new PhraseQuery {
new Term(SearchableStandard.TitlePhrase, searchTerm)
}, Occur.SHOULD);
boolQuery.Add(new PhraseQuery {
new Term(SearchableStandard.TypicalJobTitlesPhrase, searchTerm)
}, Occur.SHOULD);
boolQuery.Add(new PhraseQuery {
new Term(SearchableStandard.KeywordsPhrase, searchTerm)
}, Occur.SHOULD);
//term
foreach (var term in searchTerm.Split(' ', StringSplitOptions.RemoveEmptyEntries))
{
boolQuery.Add(new TermQuery(new Term(SearchableStandard.TitleTerm, term)), Occur.SHOULD);
boolQuery.Add(new TermQuery(new Term(SearchableStandard.TypicalJobTitlesTerm, term)), Occur.SHOULD);
boolQuery.Add(new TermQuery(new Term(SearchableStandard.KeywordsTerm, term)), Occur.SHOULD);
}
//ngram
foreach (var term in ngramSearchTerms)
{
boolQuery.Add(new TermQuery(new Term(SearchableStandard.TitleNGram, term)), Occur.SHOULD);
}
var directory = _directoryFactory.GetDirectory();
var reader = DirectoryReader.Open(directory);
var searcher = new IndexSearcher(reader);
var topDocs = searcher.Search(boolQuery, 1000);
var results = new List <StandardSearchResult>();
foreach (var scoreDoc in topDocs.ScoreDocs)
{
var doc = searcher.Doc(scoreDoc.Doc);
results.Add(new StandardSearchResult(doc, scoreDoc.Score));
}
return(new StandardSearchResultsList
{
TotalCount = topDocs.TotalHits,
Standards = results
});
}
public void Build()
{
var standardAnalyzer = new StandardAnalyzer(LuceneVersion.LUCENE_48);
var pipeAnalyzer = new PipeAnalyzer();
var ngramAnalyzer = new EdgeNGramAnalyzer();
var fieldAnalyzers = new Dictionary <string, Analyzer>
{
//phrase
{ SearchableStandard.TitlePhrase, pipeAnalyzer },
{ SearchableStandard.TypicalJobTitlesPhrase, pipeAnalyzer },
{ SearchableStandard.KeywordsPhrase, pipeAnalyzer },
//term
{ SearchableStandard.TitleTerm, standardAnalyzer },
{ SearchableStandard.TypicalJobTitlesTerm, standardAnalyzer },
{ SearchableStandard.KeywordsTerm, standardAnalyzer },
//ngram
{ SearchableStandard.TitleNGram, ngramAnalyzer }
};
var perFieldAnalyzerWrapper = new PerFieldAnalyzerWrapper(standardAnalyzer, fieldAnalyzers);
var config = new IndexWriterConfig(LuceneVersion.LUCENE_48, perFieldAnalyzerWrapper);
var directory = _directoryFactory.GetDirectory();
using (var writer = new IndexWriter(directory, config))
{
writer.DeleteAll();
writer.Commit();
foreach (var standard in _coursesDataContext.Standards)
{
var doc = new Document();
var searchable = new SearchableStandard(standard);
foreach (var indexableField in searchable.GetFields())
{
doc.Add(indexableField);
}
writer.AddDocument(doc);
writer.Commit();
}
}
}