aos.lucene.search.msc.PhraseQueryTest.java Source code

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Here is the source code for aos.lucene.search.msc.PhraseQueryTest.java

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package aos.lucene.search.msc;

import junit.framework.TestCase;
import org.apache.lucene.analysis.WhitespaceAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.PhraseQuery;
import org.apache.lucene.store.RAMDirectory;
import org.apache.lucene.store.Directory;

import java.io.IOException;

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

    protected void setUp() throws IOException {
        dir = new RAMDirectory();
        IndexWriter writer = new IndexWriter(dir, new WhitespaceAnalyzer(Version.LUCENE_46),
                IndexWriter.MaxFieldLength.UNLIMITED);
        Document doc = new Document();
        doc.add(new Field("field", "the quick brown fox jumped over the lazy dog", Field.Store.YES,
                Field.Index.ANALYZED));
        writer.addDocument(doc);
        writer.close();

        searcher = new IndexSearcher(dir);
    }

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

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

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

        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, 1));
    }

    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));
    }

}