Examples of org.apache.lucene.search.WildcardQuery

org.apache.lucene.search.WildcardQuery
Implements the wildcard search query. Supported wildcards are *, which matches any character sequence (including the empty one), and ?, which matches any single character. Note this query can be slow, as it needs to iterate over many terms. In order to prevent extremely slow WildcardQueries, a Wildcard term should not start with one of the wildcards * or ?.
This query uses the {@link MultiTermQuery#CONSTANT_SCORE_AUTO_REWRITE_DEFAULT}rewrite method. @see WildcardTermEnum

  public void testFuzzyQuery() throws ParseException {
    doConvert(new FuzzyQuery(new Term("tags", "hybrid")));
  }
  
  public void testWildcardQuery() throws ParseException {
    doConvert(new WildcardQuery(new Term("*", "m**")));
  }

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    Token token = null;
    while ((token = tokenStream.next()) != null) {
      String termText = token.termText();


      /* Contained in Title */
      WildcardQuery titleQuery = new WildcardQuery(new Term(String.valueOf(INews.TITLE), termText));
      allFieldsQuery.add(new BooleanClause(titleQuery, Occur.SHOULD));


      /* Contained in Description */
      WildcardQuery descriptionQuery = new WildcardQuery(new Term(String.valueOf(INews.DESCRIPTION), termText));
      allFieldsQuery.add(new BooleanClause(descriptionQuery, Occur.SHOULD));


      /* Contained in Attachment */
      WildcardQuery attachmentQuery = new WildcardQuery(new Term(String.valueOf(INews.ATTACHMENTS_CONTENT), termText));
      allFieldsQuery.add(new BooleanClause(attachmentQuery, Occur.SHOULD));


      /* Matches Author */
      WildcardQuery authorQuery = new WildcardQuery(new Term(String.valueOf(INews.AUTHOR), termText));
      allFieldsQuery.add(new BooleanClause(authorQuery, Occur.SHOULD));


      /* Matches Category */
      WildcardQuery categoryQuery = new WildcardQuery(new Term(String.valueOf(INews.CATEGORIES), termText));
      allFieldsQuery.add(new BooleanClause(categoryQuery, Occur.SHOULD));
    }


    /* Determine Occur (MUST, SHOULD, MUST NOT) */
    Occur occur = getOccur(condition.getSpecifier(), matchAllConditions);

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      /* Create Wildcard-Query */
      case IS:
      case IS_NOT: {
        Term term = new Term(fieldname, value.toLowerCase());
        return new WildcardQuery(term);
      }


        /* Let Query-Parser handle this */
      case CONTAINS:
      case CONTAINS_NOT: {
        Analyzer analyzer;
        synchronized (this) {
          analyzer = fIndexer.createAnalyzer();
        }
        QueryParser parser = new QueryParser(fieldname, analyzer);
        parser.setAllowLeadingWildcard(true);


        /* Prepare the value for parsing */
        value = prepareForParsing(value);


        /* Parse */
        return parser.parse(value);
      }


        /* Wildcard-Query with trailing '*' */
      case BEGINS_WITH: {
        value = new StringBuilder(value.toLowerCase()).append("*").toString();
        Term term = new Term(fieldname, value);
        WildcardQuery query = new WildcardQuery(term);
        return query;
      }


        /* Wildcard-Query with leading '*' */
      case ENDS_WITH: {
        value = new StringBuilder("*").append(value.toLowerCase()).toString();
        Term term = new Term(fieldname, value);
        return new WildcardQuery(term);
      }


        /* Fuzzy Query */
      case SIMILIAR_TO: {
        BooleanQuery similarityQuery = new BooleanQuery();

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   * Will fallback to a TermQuery if the search-term is not valid for a
   * WildcardQuery
   */
  private static Query createWildcardQuery(String field, String term) {
    if (String.valueOf(INews.LABEL).equals(field) || isValidWildcardTerm(term))
      return new WildcardQuery(new Term(field, term));


    return new TermQuery(new Term(field, term));
  }

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  public void testConstantScoreMultiTermQuery() throws Exception {


    numHighlights = 0;


    query = new WildcardQuery(new Term(FIELD_NAME, "ken*"));
    ((WildcardQuery)query).setRewriteMethod(MultiTermQuery.CONSTANT_SCORE_FILTER_REWRITE);
    searcher = new IndexSearcher(ramDir, true);
    // can't rewrite ConstantScore if you want to highlight it -
    // it rewrites to ConstantScoreQuery which cannot be highlighted
    // query = unReWrittenQuery.rewrite(reader);

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   * Builds a new WildcardQuery instance
   * @param t wildcard term
   * @return new WildcardQuery instance
   */
  protected Query newWildcardQuery(Term t) {
    WildcardQuery query = new WildcardQuery(t);
    query.setRewriteMethod(multiTermRewriteMethod);
    return query;
  }

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  public void testConstantScoreMultiTermQuery() throws Exception {


    numHighlights = 0;


    query = new WildcardQuery(new Term(FIELD_NAME, "ken*"));
    ((WildcardQuery)query).setRewriteMethod(MultiTermQuery.CONSTANT_SCORE_FILTER_REWRITE);
    searcher = new IndexSearcher(ramDir, true);
    // can't rewrite ConstantScore if you want to highlight it -
    // it rewrites to ConstantScoreQuery which cannot be highlighted
    // query = unReWrittenQuery.rewrite(reader);

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    //  be wary of unanalyzed text
    return new Query[] {
        new SpanFirstQuery(new SpanTermQuery(new Term(field, "ford")), 5),
        new SpanNearQuery(new SpanQuery[]{new SpanTermQuery(new Term(field, "night")), new SpanTermQuery(new Term(field, "trading"))}, 4, false),
        new SpanNearQuery(new SpanQuery[]{new SpanFirstQuery(new SpanTermQuery(new Term(field, "ford")), 10), new SpanTermQuery(new Term(field, "credit"))}, 10, false),
        new WildcardQuery(new Term(field, "fo*")),
    };
  }

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    switch ( termContext.getApproximation() ) {
      case EXACT:
        query = new TermQuery( new Term( fieldName, term ) );
        break;
      case WILDCARD:
        query = new WildcardQuery( new Term( fieldName, term ) );
        break;
      case FUZZY:
        query = new FuzzyQuery(
            new Term( fieldName, term ),
            termContext.getThreshold(),

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    if(query instanceof TermRangeQuery) {
      TermRangeQuery q = (TermRangeQuery)query;
      q.setBoost(query.getBoost());
      return new TermRangeQuery(q.getField(), q.getLowerTerm(), q.getUpperTerm(), q.includesLower(), q.includesUpper());
    } else if(query instanceof WildcardQuery) {
      MultiTermQuery q = new WildcardQuery(query.getTerm());
      q.setBoost(query.getBoost());
      return q;
    } else if(query instanceof PrefixQuery) {
      MultiTermQuery q = new PrefixQuery(query.getTerm());
      q.setBoost(q.getBoost());
      return q;
    } else if(query instanceof FuzzyQuery) {
      FuzzyQuery q = (FuzzyQuery)query;
      q.setBoost(q.getBoost());
      return new FuzzyQuery(q.getTerm(), q.getMinSimilarity(), q.getPrefixLength());
    }
    
    return query;
  }

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