Package org.apache.lucene.search

Examples of org.apache.lucene.search.FuzzyQuery

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    @Override public Query fieldQuery(String value, QueryParseContext context) {
        return new TermQuery(termFactory.createTerm(indexedValue(value)));
    }

    @Override public Query fuzzyQuery(String value, String minSim, int prefixLength, int maxExpansions) {
        return new FuzzyQuery(termFactory.createTerm(indexedValue(value)), Float.parseFloat(minSim), prefixLength, maxExpansions);
    }
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    @Override public Query fuzzyQuery(String value, String minSim, int prefixLength, int maxExpansions) {
        return new FuzzyQuery(termFactory.createTerm(indexedValue(value)), Float.parseFloat(minSim), prefixLength, maxExpansions);
    }

    @Override public Query fuzzyQuery(String value, double minSim, int prefixLength, int maxExpansions) {
        return new FuzzyQuery(termFactory.createTerm(value), (float) minSim, prefixLength, maxExpansions);
    }
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   * @param args
   */
  public static void main(String[] args) throws Exception {
    LuceneIndexerSearcher lis = new LuceneIndexerSearcher(false);
   
    Query q = new FuzzyQuery(new Term("txt", "adrenaline"), 0.1f);
    Query qq = lis.getIndexSearcher().rewrite(q);
   
    if(qq instanceof BooleanQuery) {
      BooleanQuery bq = (BooleanQuery)qq;
      BooleanClause [] clauses = bq.getClauses();
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   * @return The possible expansions.
   * @throws Exception
   */
  @SuppressWarnings("unchecked")
  public List<String> suggestTerms(String start) throws Exception {
    Query q = new FuzzyQuery(new Term("txt", start+"xxxx"), 0.0f, start.length());
    Query qq = getIndexSearcher().rewrite(q);
   
    if(qq instanceof BooleanQuery) {
      BooleanQuery bq = (BooleanQuery)qq;
      BooleanClause [] clauses = bq.getClauses();
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    assertTrue(getQuery("term*", null) instanceof PrefixQuery);
    assertTrue(getQuery("term*^2", null) instanceof PrefixQuery);
    assertTrue(getQuery("term~", null) instanceof FuzzyQuery);
    assertTrue(getQuery("term~0.7", null) instanceof FuzzyQuery);
    FuzzyQuery fq = (FuzzyQuery) getQuery("term~0.7", null);
    assertEquals(0.7f, fq.getMinSimilarity(), 0.1f);
    assertEquals(FuzzyQuery.defaultPrefixLength, fq.getPrefixLength());
    fq = (FuzzyQuery) getQuery("term~", null);
    assertEquals(0.5f, fq.getMinSimilarity(), 0.1f);
    assertEquals(FuzzyQuery.defaultPrefixLength, fq.getPrefixLength());

    assertQueryNodeException("term~1.1"); // value > 1, throws exception

    assertTrue(getQuery("term*germ", null) instanceof WildcardQuery);

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    assertTrue(getQuery("term*", null) instanceof PrefixQuery);
    assertTrue(getQuery("term*^2", null) instanceof PrefixQuery);
    assertTrue(getQuery("term~", null) instanceof FuzzyQuery);
    assertTrue(getQuery("term~0.7", null) instanceof FuzzyQuery);
    FuzzyQuery fq = (FuzzyQuery) getQuery("term~0.7", null);
    assertEquals(0.7f, fq.getMinSimilarity(), 0.1f);
    assertEquals(FuzzyQuery.defaultPrefixLength, fq.getPrefixLength());
    fq = (FuzzyQuery) getQuery("term~", null);
    assertEquals(0.5f, fq.getMinSimilarity(), 0.1f);
    assertEquals(FuzzyQuery.defaultPrefixLength, fq.getPrefixLength());
    try {
      getQuery("term~1.1", null); // value > 1, throws exception
      fail();
    } catch (ParseException pe) {
      // expected exception
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    assertTrue(getQuery("term*", null) instanceof PrefixQuery);
    assertTrue(getQuery("term*^2", null) instanceof PrefixQuery);
    assertTrue(getQuery("term~", null) instanceof FuzzyQuery);
    assertTrue(getQuery("term~0.7", null) instanceof FuzzyQuery);
    FuzzyQuery fq = (FuzzyQuery)getQuery("term~0.7", null);
    assertEquals(0.7f, fq.getMinSimilarity(), 0.1f);
    assertEquals(FuzzyQuery.defaultPrefixLength, fq.getPrefixLength());
    fq = (FuzzyQuery)getQuery("term~", null);
    assertEquals(0.5f, fq.getMinSimilarity(), 0.1f);
    assertEquals(FuzzyQuery.defaultPrefixLength, fq.getPrefixLength());
   
    assertParseException("term~1.1"); // value > 1, throws exception

    assertTrue(getQuery("term*germ", null) instanceof WildcardQuery);

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    assertTrue(getQuery("term*", null) instanceof PrefixQuery);
    assertTrue(getQuery("term*^2", null) instanceof PrefixQuery);
    assertTrue(getQuery("term~", null) instanceof FuzzyQuery);
    assertTrue(getQuery("term~0.7", null) instanceof FuzzyQuery);
    FuzzyQuery fq = (FuzzyQuery)getQuery("term~0.7", null);
    assertEquals(0.7f, fq.getMinSimilarity(), 0.1f);
    assertEquals(FuzzyQuery.defaultPrefixLength, fq.getPrefixLength());
    fq = (FuzzyQuery)getQuery("term~", null);
    assertEquals(0.5f, fq.getMinSimilarity(), 0.1f);
    assertEquals(FuzzyQuery.defaultPrefixLength, fq.getPrefixLength());
    try {
      getQuery("term~1.1", null);   // value > 1, throws exception
      fail();
    } catch(ParseException pe) {
      // expected exception
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      @Override
      protected Analyzer getIndexAnalyzer(String field) {
        return analyzer;
      }
    };
    Query query = new FuzzyQuery(new Term("body", "tets"), 1);
    TopDocs topDocs = searcher.search(query, null, 10, Sort.INDEXORDER);
    assertEquals(2, topDocs.totalHits);
    String snippets[] = highlighter.highlight("body", query, searcher, topDocs);
    assertEquals(2, snippets.length);
    assertEquals("This is a <b>test</b>.", snippets[0]);
    assertEquals("<b>Test</b> a one sentence document.", snippets[1]);
   
    // with prefix
    query = new FuzzyQuery(new Term("body", "tets"), 1, 2);
    topDocs = searcher.search(query, null, 10, Sort.INDEXORDER);
    assertEquals(2, topDocs.totalHits);
    snippets = highlighter.highlight("body", query, searcher, topDocs);
    assertEquals(2, snippets.length);
    assertEquals("This is a <b>test</b>.", snippets[0]);
    assertEquals("<b>Test</b> a one sentence document.", snippets[1]);
   
    // wrong field
    BooleanQuery bq = new BooleanQuery();
    bq.add(new MatchAllDocsQuery(), BooleanClause.Occur.SHOULD);
    bq.add(new FuzzyQuery(new Term("bogus", "tets"), 1), BooleanClause.Occur.SHOULD);
    topDocs = searcher.search(bq, null, 10, Sort.INDEXORDER);
    assertEquals(2, topDocs.totalHits);
    snippets = highlighter.highlight("body", bq, searcher, topDocs);
    assertEquals(2, snippets.length);
    assertEquals("This is a test.", snippets[0]);
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            return pq.toString();
          }
        });
      }
    } else if (query instanceof FuzzyQuery) {
      final FuzzyQuery fq = (FuzzyQuery) query;
      if (fq.getField().equals(field)) {
        String utf16 = fq.getTerm().text();
        int termText[] = new int[utf16.codePointCount(0, utf16.length())];
        for (int cp, i = 0, j = 0; i < utf16.length(); i += Character.charCount(cp)) {
          termText[j++] = cp = utf16.codePointAt(i);
        }
        int termLength = termText.length;
        int prefixLength = Math.min(fq.getPrefixLength(), termLength);
        String suffix = UnicodeUtil.newString(termText, prefixLength, termText.length - prefixLength);
        LevenshteinAutomata builder = new LevenshteinAutomata(suffix, fq.getTranspositions());
        Automaton automaton = builder.toAutomaton(fq.getMaxEdits());
        if (prefixLength > 0) {
          Automaton prefix = BasicAutomata.makeString(UnicodeUtil.newString(termText, 0, prefixLength));
          automaton = BasicOperations.concatenate(prefix, automaton);
        }
        list.add(new CharacterRunAutomaton(automaton) {
          @Override
          public String toString() {
            return fq.toString();
          }
        });
      }
    } else if (query instanceof TermRangeQuery) {
      final TermRangeQuery tq = (TermRangeQuery) query;
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