Lucene Index Yazma Sınıfları

IndexWriter Sınıfı

Giriş
Şu satırı dahil ederiz.

import org.apache.lucene.index.IndexWriter;

constructor
İmzası şöyle

IndexWriter(Directory d, Analyzer a, boolean create, IndexWriter.MaxFieldLength mfl) 

Açıklaması şöyle

IndexWriter accepts an analyzer used to tokenize data before it is indexed.

Şöyle yaparız.

File directory = ...;
IndexWriter indexWriter = new IndexWriter(FSDirectory.open(directory), analyzer,
  IndexWriter.MaxFieldLength.LIMITED);

constructor - Directory + IndexWriterConfig
Şöyle yaparız.

RAMDirectory ramDir = ...;
Analyzer analyzer = ...;

// Setup the configuration for the index
IndexWriterConfig config = new IndexWriterConfig(analyzer);
config.setOpenMode(IndexWriterConfig.OpenMode.CREATE);

// IndexWriter creates and maintains the index
IndexWriter writer = new IndexWriter(ramDir, config);

close metodu
Şöyle yaparız.

indexWriter.close();

constructor - IndexWriterConfig
Şöyle yaparız.

Analyzer analyzer = ...;
Directory directory = new RAMDirectory();
IndexWriterConfig config = new IndexWriterConfig(analyzer);
IndexWriter indexWriter = new IndexWriter(directory, config);

addDocument metodu

Örnek
Şöyle yaparız.

Document doc = new Document();
...
indexWriter.addDocument(doc);

Örnek
Şöyle yaparız.

// Create the documents
indexDoc(writer, "document-1", "hello planet mercury");
indexDoc(writer, "document-2", "hi PLANET venus");
indexDoc(writer, "document-3", "howdy Planet Earth");
indexDoc(writer, "document-4", "hey planet MARS");
indexDoc(writer, "document-5", "ayee Planet jupiter");

// Close down the writer
writer.close();


private static void indexDoc(IndexWriter writer, String name, String content) 
        throws IOException {
  Document document = new Document();
  document.add(new TextField("name", name, Field.Store.YES));
  document.add(new TextField("body", content, Field.Store.YES));

  writer.addDocument(document);
}

getReader metodu
Şöyle yaparız.

IndexReader indexReader = indexWriter.getReader();

IndexWriterConfig Sınıfı
Giriş
Şu satırı dahil ederiz.

import org.apache.lucene.index.IndexWriterConfig;

constructor metodu - Analyzer

Örnek
Şöyle yaparız.

// Create the analyzer (has default stop words)
Analyzer analyzer = new StandardAnalyzer();

// Setup the configuration for the index
IndexWriterConfig config = new IndexWriterConfig(analyzer);
config.setOpenMode(IndexWriterConfig.OpenMode.CREATE);

Örnek
Şöyle yaparız.

EnglishAnalyzer an = new EnglishAnalyzer();
IndexWriterConfig config = new IndexWriterConfig(an);

constructor metodu - version + Analyzer
Şöyle yaparız.

StandardAnalyzer analyzer = new StandardAnalyzer(Version.LUCENE_30);
IndexWriterConfig config = new IndexWriterConfig(Version.LUCENE_30,analyzer);

setCommitOnClose metodu
Şöyle yaparız.

config.setCommitOnClose(true);

setOpenMode metodu

Şöyle yaparız.

config.setOpenMode(IndexWriterConfig.OpenMode.CREATE);

Şöyle yaparız.

config.setOpenMode(OpenMode.CREATE_OR_APPEND);