Examples with Similarity org.apache.lucene.search.Similarity used on opensource projects

Example 6 with Similarity

use of org.apache.lucene.search.Similarity in project neo4j-mobile-android by neo4j-contrib.

the class LuceneDataSource method getIndexWriter.

synchronized IndexWriter getIndexWriter(IndexIdentifier identifier) {
    if (closed)
        throw new IllegalStateException("Index has been shut down");
    Pair<IndexWriter, AtomicBoolean> writer = indexWriters.get(identifier);
    if (writer != null) {
        return writer.first();
    }
    try {
        Directory dir = getDirectory(baseStorePath, identifier);
        directoryExists(dir);
        IndexType type = getType(identifier);
        IndexWriterConfig writerConfig = new IndexWriterConfig(LUCENE_VERSION, type.analyzer);
        writerConfig.setIndexDeletionPolicy(new MultipleBackupDeletionPolicy());
        Similarity similarity = type.getSimilarity();
        if (similarity != null) {
            writerConfig.setSimilarity(similarity);
        }
        IndexWriter indexWriter = new IndexWriter(dir, writerConfig);
        writer = Pair.of(indexWriter, new AtomicBoolean());
        // TODO We should tamper with this value and see how it affects the
        // general performance. Lucene docs says rather <10 for mixed
        // reads/writes
        // writer.setMergeFactor( 8 );
        indexWriters.put(identifier, writer);
        return writer.first();
    } catch (IOException e) {
        throw new RuntimeException(e);
    }
}