Examples of org.apache.lucene.search.FuzzyQuery

org.apache.lucene.search.FuzzyQuery
Implements the fuzzy search query. The similarity measurement is based on the Levenshtein (edit distance) algorithm. Warning: this query is not very scalable with its default prefix length of 0 - in this case, *every* term will be enumerated and cause an edit score calculation.

    String text = fuzzyNode.getTextAsString();
    
    int numEdits = FuzzyQuery.floatToEdits(fuzzyNode.getSimilarity(), 
        text.codePointCount(0, text.length()));
    
    return new FuzzyQuery(new Term(fuzzyNode.getFieldAsString(), fuzzyNode
        .getTextAsString()), numEdits, fuzzyNode
        .getPrefixLength());


  }

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    SpanFirstQuery sfq = new SpanFirstQuery(swq, 3);
    assertEquals(1, searcher.search(sfq, 10).totalHits);
  }
  
  public void testFuzzy() throws Exception {
    FuzzyQuery fq = new FuzzyQuery(new Term("field", "broan"));
    SpanQuery sfq = new SpanMultiTermQueryWrapper<>(fq);
    // will not match quick brown fox
    SpanPositionRangeQuery sprq = new SpanPositionRangeQuery(sfq, 3, 6);
    assertEquals(2, searcher.search(sprq, 10).totalHits);
  }

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    assertEquals(2, searcher.search(sprq, 10).totalHits);
  }
  
  public void testFuzzy2() throws Exception {
    // maximum of 1 term expansion
    FuzzyQuery fq = new FuzzyQuery(new Term("field", "broan"), 1, 0, 1, false);
    SpanQuery sfq = new SpanMultiTermQueryWrapper<>(fq);
    // will only match jumps over lazy broun dog
    SpanPositionRangeQuery sprq = new SpanPositionRangeQuery(sfq, 0, 100);
    assertEquals(1, searcher.search(sprq, 10).totalHits);
  }

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    SpanPositionRangeQuery sprq = new SpanPositionRangeQuery(sfq, 0, 100);
    assertEquals(1, searcher.search(sprq, 10).totalHits);
  }
  public void testNoSuchMultiTermsInNear() throws Exception {
    //test to make sure non existent multiterms aren't throwing null pointer exceptions  
    FuzzyQuery fuzzyNoSuch = new FuzzyQuery(new Term("field", "noSuch"), 1, 0, 1, false);
    SpanQuery spanNoSuch = new SpanMultiTermQueryWrapper<>(fuzzyNoSuch);
    SpanQuery term = new SpanTermQuery(new Term("field", "brown"));
    SpanQuery near = new SpanNearQuery(new SpanQuery[]{term, spanNoSuch}, 1, true);
    assertEquals(0, searcher.search(near, 10).totalHits);
    //flip order

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  }
  
  public void testNoSuchMultiTermsInNotNear() throws Exception {
    //test to make sure non existent multiterms aren't throwing non-matching field exceptions  
    FuzzyQuery fuzzyNoSuch = new FuzzyQuery(new Term("field", "noSuch"), 1, 0, 1, false);
    SpanQuery spanNoSuch = new SpanMultiTermQueryWrapper<>(fuzzyNoSuch);
    SpanQuery term = new SpanTermQuery(new Term("field", "brown"));
    SpanNotQuery notNear = new SpanNotQuery(term, spanNoSuch, 0,0);
    assertEquals(1, searcher.search(notNear, 10).totalHits);

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  }
  
  public void testNoSuchMultiTermsInOr() throws Exception {
    //test to make sure non existent multiterms aren't throwing null pointer exceptions  
    FuzzyQuery fuzzyNoSuch = new FuzzyQuery(new Term("field", "noSuch"), 1, 0, 1, false);
    SpanQuery spanNoSuch = new SpanMultiTermQueryWrapper<>(fuzzyNoSuch);
    SpanQuery term = new SpanTermQuery(new Term("field", "brown"));
    SpanOrQuery near = new SpanOrQuery(new SpanQuery[]{term, spanNoSuch});
    assertEquals(1, searcher.search(near, 10).totalHits);

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  }
  
  
  public void testNoSuchMultiTermsInSpanFirst() throws Exception {
    //this hasn't been a problem  
    FuzzyQuery fuzzyNoSuch = new FuzzyQuery(new Term("field", "noSuch"), 1, 0, 1, false);
    SpanQuery spanNoSuch = new SpanMultiTermQueryWrapper<>(fuzzyNoSuch);
    SpanQuery spanFirst = new SpanFirstQuery(spanNoSuch, 10);
 
    assertEquals(0, searcher.search(spanFirst, 10).totalHits);

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  }


  /** test a fuzzy query */
  public void testFuzzy() throws Exception {
    Query regular = new TermQuery(new Term("field", "foobar"));
    Query expected = new FuzzyQuery(new Term("field", "foobar"), 2);


    assertEquals(expected, parse("foobar~2"));
    assertEquals(regular, parse("foobar~"));
    assertEquals(regular, parse("foobar~a"));
    assertEquals(regular, parse("foobar~1a"));


    BooleanQuery bool = new BooleanQuery();
    FuzzyQuery fuzzy = new FuzzyQuery(new Term("field", "foo"), LevenshteinAutomata.MAXIMUM_SUPPORTED_DISTANCE);
    bool.add(fuzzy, Occur.MUST);
    bool.add(new TermQuery(new Term("field", "bar")), Occur.MUST);


    assertEquals(bool, parse("foo~" + LevenshteinAutomata.MAXIMUM_SUPPORTED_DISTANCE + 1 + " bar"));
  }

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   * Factory method to generate a fuzzy query.
   */
  protected Query newFuzzyQuery(String text, int fuzziness) {
    BooleanQuery bq = new BooleanQuery(true);
    for (Map.Entry<String,Float> entry : weights.entrySet()) {
      Query q = new FuzzyQuery(new Term(entry.getKey(), text), fuzziness);
      if (q != null) {
        q.setBoost(entry.getValue());
        bq.add(q, BooleanClause.Occur.SHOULD);
      }
    }
    return simplify(bq);
  }

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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(1, fq.getMaxEdits());
    assertEquals(FuzzyQuery.defaultPrefixLength, fq.getPrefixLength());
    fq = (FuzzyQuery) getQuery("term~", null);
    assertEquals(2, fq.getMaxEdits());
    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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