analysis.SynonymAnalyzerTest.java Source code

Introduction

Here is the source code for analysis.SynonymAnalyzerTest.java

Source

package analysis;

/**
 * Copyright Manning Publications Co.
 *
 * Licensed 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,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific lan      
*/

import java.io.StringReader;

import common.TestUtil;
import junit.framework.TestCase;

import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.store.RAMDirectory;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.Term;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.search.PhraseQuery;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.util.Version;
import org.apache.lucene.analysis.tokenattributes.TermAttribute;
import org.apache.lucene.analysis.tokenattributes.PositionIncrementAttribute;

// From chapter 4
public class SynonymAnalyzerTest extends TestCase {
    private IndexSearcher searcher;
    private static SynonymAnalyzer synonymAnalyzer = new SynonymAnalyzer(new TestSynonymEngine());

    public void setUp() throws Exception {
        RAMDirectory directory = new RAMDirectory();

        IndexWriter writer = new IndexWriter(directory, synonymAnalyzer, //#1  
                IndexWriter.MaxFieldLength.UNLIMITED);
        Document doc = new Document();
        doc.add(new Field("content", "The quick brown fox jumps over the lazy dog", Field.Store.YES,
                Field.Index.ANALYZED)); //#2
        writer.addDocument(doc);

        writer.close();

        searcher = new IndexSearcher(directory, true);
    }

    public void tearDown() throws Exception {
        searcher.close();
    }

    public void testJumps() throws Exception {
        TokenStream stream = synonymAnalyzer.tokenStream("contents", // #A
                new StringReader("jumps")); // #A
        TermAttribute term = stream.addAttribute(TermAttribute.class);
        PositionIncrementAttribute posIncr = stream.addAttribute(PositionIncrementAttribute.class);

        int i = 0;
        String[] expected = new String[] { "jumps", // #B
                "hops", // #B
                "leaps" }; // #B
        while (stream.incrementToken()) {
            assertEquals(expected[i], term.term());

            int expectedPos; // #C
            if (i == 0) { // #C
                expectedPos = 1; // #C
            } else { // #C
                expectedPos = 0; // #C
            } // #C
            assertEquals(expectedPos, // #C
                    posIncr.getPositionIncrement()); // #C
            i++;
        }
        assertEquals(3, i);
    }

    /*
      #A Analyze with SynonymAnalyzer
      #B Check for correct synonyms
      #C Verify synonyms positions
    */

    public void testSearchByAPI() throws Exception {

        TermQuery tq = new TermQuery(new Term("content", "hops")); //#1
        assertEquals(1, TestUtil.hitCount(searcher, tq));

        PhraseQuery pq = new PhraseQuery(); //#2
        pq.add(new Term("content", "fox")); //#2
        pq.add(new Term("content", "hops")); //#2
        assertEquals(1, TestUtil.hitCount(searcher, pq));
    }

    /*
      #1 Search for "hops"
      #2 Search for "fox hops"
    */

    public void testWithQueryParser() throws Exception {
        Query query = new QueryParser(Version.LUCENE_30, // 1
                "content", // 1
                synonymAnalyzer).parse("\"fox jumps\""); // 1
        assertEquals(1, TestUtil.hitCount(searcher, query)); // 1
        System.out.println("With SynonymAnalyzer, \"fox jumps\" parses to " + query.toString("content"));

        query = new QueryParser(Version.LUCENE_30, // 2
                "content", // 2
                new StandardAnalyzer(Version.LUCENE_30)).parse("\"fox jumps\""); // B
        assertEquals(1, TestUtil.hitCount(searcher, query)); // 2
        System.out.println("With StandardAnalyzer, \"fox jumps\" parses to " + query.toString("content"));
    }

    /*
      #1 SynonymAnalyzer finds the document
      #2 StandardAnalyzer also finds document
    */
}