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Lucene example source code file (TestKeywordAnalyzer.java)

This example Lucene source code file (TestKeywordAnalyzer.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Lucene tags/keywords

document, document, exception, exception, field, indexwriter, indexwriter, io, keywordanalyzer, perfieldanalyzerwrapper, q36, queryparser, ramdirectory, ramdirectory, test_version_current

The Lucene TestKeywordAnalyzer.java source code

package org.apache.lucene.analysis;

 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *     http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.

import java.io.StringReader;

import org.apache.lucene.analysis.tokenattributes.OffsetAttribute;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.Term;
import org.apache.lucene.index.TermDocs;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.store.RAMDirectory;

public class TestKeywordAnalyzer extends BaseTokenStreamTestCase {
  private RAMDirectory directory;
  private IndexSearcher searcher;

  public void setUp() throws Exception {
    directory = new RAMDirectory();
    IndexWriter writer = new IndexWriter(directory, new IndexWriterConfig(
        TEST_VERSION_CURRENT, new SimpleAnalyzer(

    Document doc = new Document();
    doc.add(new Field("partnum", "Q36", Field.Store.YES, Field.Index.NOT_ANALYZED));
    doc.add(new Field("description", "Illidium Space Modulator", Field.Store.YES, Field.Index.ANALYZED));


    searcher = new IndexSearcher(directory, true);

  public void testPerFieldAnalyzer() throws Exception {
    PerFieldAnalyzerWrapper analyzer = new PerFieldAnalyzerWrapper(new SimpleAnalyzer(TEST_VERSION_CURRENT));
    analyzer.addAnalyzer("partnum", new KeywordAnalyzer());

    QueryParser queryParser = new QueryParser(TEST_VERSION_CURRENT, "description", analyzer);
    Query query = queryParser.parse("partnum:Q36 AND SPACE");

    ScoreDoc[] hits = searcher.search(query, null, 1000).scoreDocs;
    assertEquals("Q36 kept as-is",
              "+partnum:Q36 +space", query.toString("description"));
    assertEquals("doc found!", 1, hits.length);

  public void testMutipleDocument() throws Exception {
    RAMDirectory dir = new RAMDirectory();
    IndexWriter writer = new IndexWriter(dir, new IndexWriterConfig(TEST_VERSION_CURRENT, new KeywordAnalyzer()));
    Document doc = new Document();
    doc.add(new Field("partnum", "Q36", Field.Store.YES, Field.Index.ANALYZED));
    doc = new Document();
    doc.add(new Field("partnum", "Q37", Field.Store.YES, Field.Index.ANALYZED));

    IndexReader reader = IndexReader.open(dir, true);
    TermDocs td = reader.termDocs(new Term("partnum", "Q36"));
    td = reader.termDocs(new Term("partnum", "Q37"));

  // LUCENE-1441
  public void testOffsets() throws Exception {
    TokenStream stream = new KeywordAnalyzer().tokenStream("field", new StringReader("abcd"));
    OffsetAttribute offsetAtt = stream.addAttribute(OffsetAttribute.class);
    assertEquals(0, offsetAtt.startOffset());
    assertEquals(4, offsetAtt.endOffset());
  /** blast some random strings through the analyzer */
  public void testRandomStrings() throws Exception {
    checkRandomData(random, new KeywordAnalyzer(), 10000*RANDOM_MULTIPLIER);

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