Examples of org.apache.lucene.queryParser.QueryParser

org.apache.lucene.queryParser.QueryParser
This class is generated by JavaCC. The most important method is {@link #parse(String)}. The syntax for query strings is as follows: A Query is a series of clauses. A clause may be prefixed by:
- a plus (+) or a minus (-) sign, indicating that the clause is required or prohibited respectively; or
- a term followed by a colon, indicating the field to be searched. This enables one to construct queries which search multiple fields.
A clause may be either:
- a term, indicating all the documents that contain this term; or
- a nested query, enclosed in parentheses. Note that this may be used with a +/- prefix to require any of a set of terms.
Thus, in BNF, the query grammar is:
```
 Query  ::= ( Clause ) Clause ::= ["+", "-"] [<TERM> ":"] ( <TERM> | "(" Query ")" ) 
```
Examples of appropriately formatted queries can be found in the query syntax documentation.

In {@link TermRangeQuery}s, QueryParser tries to detect date values, e.g. date:[6/1/2005 TO 6/4/2005] produces a range query that searches for "date" fields between 2005-06-01 and 2005-06-04. Note that the format of the accepted input depends on {@link #setLocale(Locale) the locale}. By default a date is converted into a search term using the deprecated {@link DateField} for compatibility reasons.To use the new {@link DateTools} to convert dates, a{@link org.apache.lucene.document.DateTools.Resolution} has to be set.

The date resolution that shall be used for RangeQueries can be set using {@link #setDateResolution(DateTools.Resolution)}or {@link #setDateResolution(String,DateTools.Resolution)}. The former sets the default date resolution for all fields, whereas the latter can be used to set field specific date resolutions. Field specific date resolutions take, if set, precedence over the default date resolution.

If you use neither {@link DateField} nor {@link DateTools} in yourindex, you can create your own query parser that inherits QueryParser and overwrites {@link #getRangeQuery(String,String,String,boolean)} touse a different method for date conversion.

Note that QueryParser is not thread-safe.

NOTE: there is a new QueryParser in contrib, which matches the same syntax as this class, but is more modular, enabling substantial customization to how a query is created.
NOTE: You must specify the required {@link Version}compatibility when creating QueryParser:

  protected String go() throws Exception {
    logger.debug("Start SearchTermSuggestion. q = " + getQ()
        + " keywords size: " + keywords.size());
    if (q != null && searchTermSuggestion != null) {    
      TermQuery termQuery = null;
      QueryParser parser = new QueryParser(DocumentCreator.FIELD_TEXT,DocumentCreator.createDocumentAnalyzer());
      Query query = null;
      try{
        query = parser.parse(q);
      }catch(Exception e){
        logger.debug("QueryParser error: " + e);
      }
      if(query == null){
        return SUCCESS;

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//  String query = queryString.toString();
//System.out.println("query string " + query);
//System.out.println("gen q: " + theQuery);


  analyzer.setExtractEntities(false);
  QueryParser qp = new QueryParser("contents", analyzer);  
  try { return(qp.parse(queryString.toString()) ); }
  catch(ParseException pe) { }
  
  return(theQuery);
 }

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 public Hits getHits(String str, boolean filter)
 {
  Hits hits = null; bgramAnalyzer.setExtractEntities(false);
  try
  {
   QueryParser qp = new QueryParser("contents", bgramAnalyzer );
   if (filter) str = str.replaceAll("[^a-zA-Z0-9\"']", " ");
   query = qp.parse(str);
   logger.info("Query " + str + " is parsed to -->" + query + "<---"); 
   hits = is.search(query);
   setAlt( (sc != null) ? sc.didYouMean(query.toString("contents")): "");
  }
  catch (IOException ie) { logger.error("Problem with reading the Lucene index directory " + ie.getMessage()); }

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      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();

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        /* Let Query-Parser handle this */
      case CONTAINS:
      case CONTAINS_ALL:
      case CONTAINS_NOT: {
        QueryParser parser = new QueryParser(fieldname, analyzer);
        Operator operator = (specifier == SearchSpecifier.CONTAINS || specifier == SearchSpecifier.CONTAINS_NOT) ? QueryParser.OR_OPERATOR : QueryParser.AND_OPERATOR;
        parser.setDefaultOperator(operator);
        parser.setAllowLeadingWildcard(true);


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


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


        /* Wildcard-Query with trailing '*' */
      case BEGINS_WITH: {
        value = value.toLowerCase() + "*"; //$NON-NLS-1$

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      indexWriter = new IndexWriter(indexDirectory,
          new IndexWriterConfig(Version.LUCENE_31,
              new LimitTokenCountAnalyzer(analyzer,
                  Integer.MAX_VALUE))
              .setOpenMode(OpenMode.CREATE));
      queryParser = new QueryParser(Version.LUCENE_31, "text", analyzer);
      queryParser.setDefaultOperator(QueryParser.AND_OPERATOR);


      fulltext = new Field("text", "", Field.Store.NO,
          Field.Index.ANALYZED);
      fulltext.setOmitTermFreqAndPositions(true);

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    return score.floatValue();
  }
  
  /** parses a Lucene query */
  private Query parse(String query, Analyzer analyzer) throws ParseException {
    QueryParser parser = new QueryParser(FIELD_NAME, analyzer);
    return parser.parse(query);
  }

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      indexes[i].addField(field, lines.get(i).getValue(), textAnalyzer);
    }
    doc = null;   // help gc
    lines = null; // help gc
    
    Query query = new QueryParser(field, queryAnalyzer).parse(queryExpr);
    
    float sum = 0;
    for (int run=0; run < runs; run++) {
      System.out.println("\nrun=" + run);
      long start = System.currentTimeMillis();

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      return ((MemoryIndex) index).getMemorySize();
    }
  }
  
  private Query parseQuery(String expression) throws ParseException {
    QueryParser parser = new QueryParser(FIELD_NAME, analyzer);
//    parser.setPhraseSlop(0);
    return parser.parse(expression);
  }

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      {
         Map<String,Float> boostPerField = new HashMap<String,Float>();
         boostPerField.put( "title:en", 4f );
         boostPerField.put( "body:en", 1f );
         String[] productFields = {"title:en", "body:en"};
         QueryParser parser = new MultiFieldQueryParser(productFields, new StandardAnalyzer(), boostPerField);
         parser.setAllowLeadingWildcard(true);
         org.apache.lucene.search.Query luceneQuery;
         try
         {
            luceneQuery = parser.parse(searchPattern);
         }
         catch (ParseException e)
         {
            return null;
         }

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