com.mathworks.xzheng.tools.HighlightTest.java Source code

Introduction

Here is the source code for com.mathworks.xzheng.tools.HighlightTest.java

Source

package com.mathworks.xzheng.tools;

/**
 * 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 junit.framework.TestCase;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.core.SimpleAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.search.highlight.Fragmenter;
import org.apache.lucene.search.highlight.Highlighter;
import org.apache.lucene.search.highlight.QueryScorer;
import org.apache.lucene.search.highlight.SimpleSpanFragmenter;
import org.apache.lucene.search.highlight.TokenSources;
import org.apache.lucene.util.Version;

import com.mathworks.xzheng.common.TestUtil;

// From chapter 8
public class HighlightTest extends TestCase {
    public void testHighlighting() throws Exception {
        String text = "The quick brown fox jumps over the lazy dog";

        TermQuery query = new TermQuery(new Term("field", "fox"));

        TokenStream tokenStream = new SimpleAnalyzer(Version.LUCENE_46).tokenStream("field",
                new StringReader(text));

        QueryScorer scorer = new QueryScorer(query, "field");
        Fragmenter fragmenter = new SimpleSpanFragmenter(scorer);
        Highlighter highlighter = new Highlighter(scorer);
        highlighter.setTextFragmenter(fragmenter);
        assertEquals("The quick brown <B>fox</B> jumps over the lazy dog",
                highlighter.getBestFragment(tokenStream, text));
    }

    public void testHits() throws Exception {
        IndexSearcher searcher = new IndexSearcher(DirectoryReader.open(TestUtil.getBookIndexDirectory()));
        TermQuery query = new TermQuery(new Term("title", "action"));
        TopDocs hits = searcher.search(query, 10);

        QueryScorer scorer = new QueryScorer(query, "title");
        Highlighter highlighter = new Highlighter(scorer);
        highlighter.setTextFragmenter(new SimpleSpanFragmenter(scorer));

        Analyzer analyzer = new SimpleAnalyzer(Version.LUCENE_46);

        for (ScoreDoc sd : hits.scoreDocs) {
            Document doc = searcher.doc(sd.doc);
            String title = doc.get("title");

            TokenStream stream = TokenSources.getAnyTokenStream(searcher.getIndexReader(), sd.doc, "title", doc,
                    analyzer);
            String fragment = highlighter.getBestFragment(stream, title);

            System.out.println(fragment);
        }
    }

}