Package org.apache.lucene.search.similarities

Examples of org.apache.lucene.search.similarities.DefaultSimilarity

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    IndexReader r = w.getReader();
    IndexSearcher s = newSearcher(r);
    // this test relies upon coord being the default implementation,
    // otherwise scores are different!
    s.setSimilarity(new DefaultSimilarity());

    BooleanQuery q = new BooleanQuery();
    q.add(new TermQuery(new Term("field", "a")), BooleanClause.Occur.SHOULD);

    // LUCENE-2617: make sure that a term not in the index still contributes to the score via coord factor
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    }

    public void testRewriteCoord1() throws Exception {
      final Similarity oldSimilarity = s.getSimilarity();
      try {
        s.setSimilarity(new DefaultSimilarity() {
          @Override
          public float coord(int overlap, int maxOverlap) {
            return overlap / ((float)maxOverlap + 1);
          }
        });
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    }
   
    public void testRewriteNegate() throws Exception {
      final Similarity oldSimilarity = s.getSimilarity();
      try {
        s.setSimilarity(new DefaultSimilarity() {
          @Override
          public float coord(int overlap, int maxOverlap) {
            return overlap / ((float)maxOverlap + 1);
          }
        });
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    directory = newDirectory();
   
    RandomIndexWriter writer = new RandomIndexWriter(random(), directory,
        newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random()))
        .setMergePolicy(newLogMergePolicy())
        .setSimilarity(new DefaultSimilarity()));
    for (int i = 0; i < values.length; i++) {
      Document doc = new Document();
      doc
          .add(newTextField(FIELD, values[i], Field.Store.YES));
      writer.addDocument(doc);
    }
    indexReader = SlowCompositeReaderWrapper.wrap(writer.getReader());
    writer.close();
    indexSearcher = newSearcher(indexReader);
    indexSearcher.setSimilarity(new DefaultSimilarity());
  }
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  private IndexSearcher getSearcher(IndexReader r) {
    IndexSearcher searcher = newSearcher(r);

    // We rely on more tokens = lower score:
    searcher.setSimilarity(new DefaultSimilarity());

    return searcher;
  }
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    // Do ordinary BooleanQuery:
    BooleanQuery bq = new BooleanQuery();
    bq.add(new TermQuery(new Term("field", "wizard")), Occur.SHOULD);
    bq.add(new TermQuery(new Term("field", "oz")), Occur.SHOULD);
    IndexSearcher searcher = getSearcher(r);
    searcher.setSimilarity(new DefaultSimilarity());

    TopDocs hits = searcher.search(bq, 10);
    assertEquals(2, hits.totalHits);
    assertEquals("0", searcher.doc(hits.scoreDocs[0].doc).get("id"));
    assertEquals("1", searcher.doc(hits.scoreDocs[1].doc).get("id"));
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    // Do ordinary BooleanQuery:
    BooleanQuery bq = new BooleanQuery();
    bq.add(new TermQuery(new Term("field", "wizard")), Occur.SHOULD);
    bq.add(new TermQuery(new Term("field", "oz")), Occur.SHOULD);
    IndexSearcher searcher = getSearcher(r);
    searcher.setSimilarity(new DefaultSimilarity());

    TopDocs hits = searcher.search(bq, 10);
    assertEquals(2, hits.totalHits);
    assertEquals("0", searcher.doc(hits.scoreDocs[0].doc).get("id"));
    assertEquals("1", searcher.doc(hits.scoreDocs[1].doc).get("id"));
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  /**
   * Constructor requiring an IndexReader.
   */
  public MoreLikeThis(IndexReader ir) {
    this(ir, new DefaultSimilarity());
  }
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  public void testReallyNoNormsForDrillDown() throws Exception {
    Directory dir = newDirectory();
    Directory taxoDir = newDirectory();
    IndexWriterConfig iwc = newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random()));
    iwc.setSimilarity(new PerFieldSimilarityWrapper() {
        final Similarity sim = new DefaultSimilarity();

        @Override
        public Similarity get(String name) {
          assertEquals("field", name);
          return sim;
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    restoreProperties.put("user.timezone", System.getProperty("user.timezone"));
    savedTimeZone = TimeZone.getDefault();
    TimeZone randomTimeZone = randomTimeZone(random());
    timeZone = testTimeZone.equals("random") ? randomTimeZone : TimeZone.getTimeZone(testTimeZone);
    TimeZone.setDefault(timeZone);
    similarity = random().nextBoolean() ? new DefaultSimilarity() : new RandomSimilarityProvider(random());

    // Check codec restrictions once at class level.
    try {
      checkCodecRestrictions(codec);
    } catch (AssumptionViolatedException e) {
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