com.sxc.lucene.searching.PhraseQueryTest.java Source code

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Here is the source code for com.sxc.lucene.searching.PhraseQueryTest.java

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package com.sxc.lucene.searching;

/**
 * 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.File;
import java.io.IOException;

import junit.framework.TestCase;

import org.apache.lucene.analysis.cn.smart.SmartChineseAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.TextField;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.IndexWriterConfig.OpenMode;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.PhraseQuery;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.util.Version;

// From chapter 3
public class PhraseQueryTest extends TestCase {
    private Directory dir;
    private IndexSearcher searcher;

    protected void setUp() throws IOException {
        dir = FSDirectory.open(new File("D:/programming/lucene/PhraseQueryTest"));
        IndexWriterConfig config = new IndexWriterConfig(Version.LUCENE_47,
                new SmartChineseAnalyzer(Version.LUCENE_47));
        config.setOpenMode(OpenMode.CREATE);
        IndexWriter writer = new IndexWriter(dir, config);

        Document doc = new Document();
        doc.add(new TextField("field", // 1
                "the quick brown fox jumped over the lazy dog", // 1
                Field.Store.YES)); // 1
        writer.addDocument(doc);
        writer.close();

        searcher = new IndexSearcher(DirectoryReader.open(dir));
    }

    protected void tearDown() throws IOException {
        searcher.getIndexReader().close();
        dir.close();
    }

    private boolean matched(String[] phrase, int slop) throws IOException {
        PhraseQuery query = new PhraseQuery(); // 2
        query.setSlop(slop); // 2

        for (String word : phrase) { // 3
            query.add(new Term("field", word)); // 3
        } // 3

        TopDocs matches = searcher.search(query, 10);
        return matches.totalHits > 0;
    }

    /*
     * #1 Add a single test document #2 Create initial PhraseQuery #3 Add
     * sequential phrase terms
     */
    public void testSlopComparison() throws Exception {
        String[] phrase = new String[] { "quick", "fox" };

        assertFalse("exact phrase not found", matched(phrase, 0));

        assertTrue("close enough", matched(phrase, 2));
    }

    public void testReverse() throws Exception {
        String[] phrase = new String[] { "fox", "quick" };

        assertFalse("hop flop", matched(phrase, 2));
        assertTrue("hop hop slop", matched(phrase, 3));
    }

    public void testMultiple() throws Exception {
        assertFalse("not close enough", matched(new String[] { "quick", "jumped", "lazy" }, 3));

        assertTrue("just enough", matched(new String[] { "quick", "jumped", "lazy" }, 4));

        assertFalse("almost but not quite", matched(new String[] { "lazy", "jumped", "quick" }, 7));

        assertTrue("bingo", matched(new String[] { "lazy", "jumped", "quick" }, 8));
    }

}