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:

        StringTokenizer st = new StringTokenizer(params.getSearchKey());
        while(st.hasMoreElements()){
          String q = st.nextToken();
      String[] indexFields = searching.getIndexFields();
      for(int i=0;i<indexFields.length;i++){
        QueryParser qp = new QueryParser(indexFields[i], analyzer);
        try{
          Query subjectQuery = qp.parse(q);
          comboQuery.add(subjectQuery, BooleanClause.Occur.SHOULD);
          _query_count ++;
        }catch(Exception e){
          log.error("Add query parameter failed. key="+q, e);
        }

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            // take a reference as the searcher may change
            Searcher searcher = access.searcher;
            // reuse the same analyzer; it's thread-safe;
            // also allows subclasses to control the analyzer used.
            Analyzer analyzer = access.writer.getAnalyzer();
            QueryParser parser = new QueryParser(Version.LUCENE_30,
                    LUCENE_FIELD_DATA, analyzer);
            Query query = parser.parse(text);
            // Lucene 3 insists on a hard limit and will not provide
            // a total hits value. Take at least 100 which is
            // an optimal limit for Lucene as any more
            // will trigger writing results to disk.
            int maxResults = (limit == 0 ? 100 : limit) + offset;

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  }
  
  public void testQueryWithScore() throws Exception{
    BrowseRequest br=new BrowseRequest();
    br.setShowExplanation(false);  // default
      QueryParser parser=new QueryParser(Version.LUCENE_29,"color",new StandardAnalyzer(Version.LUCENE_29));
      br.setQuery(parser.parse("color:red OR shape:square"));
        br.setCount(10);
        br.setOffset(0);
        
        br.setSort(new SortField[]{SortField.FIELD_SCORE});
        BrowseResult res = doTest(br,4,null,new String[]{"1","7","2","5"});

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  }


  public void testBrowseWithQuery(){
    try{
      BrowseRequest br=new BrowseRequest();
      QueryParser parser=new QueryParser(Version.LUCENE_29,"shape",new StandardAnalyzer(Version.LUCENE_29));
      br.setQuery(parser.parse("square OR circle"));
        br.setCount(10);
        br.setOffset(0);
        
        BrowseSelection sel=new BrowseSelection("color");
        sel.addValue("red");

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//    System.out.println("request after conversion to msg:\n" + req.toString());
    String reqString = TextFormat.printToString(req);
    reqString = reqString.replace('\r', ' ').replace('\n', ' ');
//    System.out.println(reqString);
    Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_CURRENT);
    QueryParser _qparser = new QueryParser(Version.LUCENE_CURRENT,"", analyzer);
//    System.out.println("msg to req");
    BrowseRequest boboReqAfter = BrowseProtobufConverter.convert(req, _qparser);
//    System.out.println("get query 2: "
//        + (boboReqAfter.getQuery() != null ? boboReqAfter.getQuery().getClass()
//            : "null query"));

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  }
  
  static void doBrowse(BoboBrowser browser) throws Exception
  {
    String q="java";
    QueryParser parser=new QueryParser(Version.LUCENE_CURRENT,"b",new StandardAnalyzer(Version.LUCENE_CURRENT));
    Query query=parser.parse(q);
    BrowseRequest br=new BrowseRequest();
    //br.setQuery(query);
    br.setOffset(0);
    br.setCount(0);

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          }
        }
  
        // Check whether the document is in the index
        Analyzer analyzer = new WhitespaceAnalyzer();
        QueryParser parser = new QueryParser(Version.LUCENE_30, "url", analyzer);
        String queryString = "\"" + transformedFileUrl + "\"";
        
        try {
          query = parser.parse(queryString);
        } catch (ParseException ex) {
          throw new RegainException("Parsing of url lookup-query failed.", ex);
        }
        
        ScoreDoc[] hits = manager.search(query);

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          for (int k = 0; k < indexConfigs.length; k++) {


            String[] searchFieldArr = indexConfigs[k].getSearchFieldList();
            for (int i = 0; i < searchFieldArr.length; i++) {


              QueryParser parser = new QueryParser(Version.LUCENE_30, searchFieldArr[i], mAnalyzer);
              parser.setDefaultOperator(QueryParser.AND_OPERATOR);
              parser.setAllowLeadingWildcard(true);
              Query fieldQuery = parser.parse(queryText);


              // Add as OR
              mQuery.add(fieldQuery, Occur.SHOULD);
            }
            //System.out.println("Query: '" + queryText + "' -> '" + mQuery.toString() + "'");

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    IndexSearcher searcher = null;
    try {
      File directory = searchIndexManager.getIndexDirectory();
      searcher = new IndexSearcher(IndexReader.open(directory));
      Analyzer analyzer = DocumentCreator.createDocumentAnalyzer();
      QueryParser parser = new QueryParser(DocumentCreator.FIELD_TEXT,analyzer);
      Hits hits = searcher.search(parser.parse(query));
      List<BookmarkDoc> bmDocs = new ArrayList<BookmarkDoc>();
      if (offset >= 0 && offset < hits.length()) {
        if (count > 0) {          
          for (int i = offset; i < hits.length() && bmDocs.size() < count; i++) {
            BookmarkDoc doc = createBookmarkDoc(hits.doc(i));

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    IndexSearcher searcher = null;
    try {
      File directory = searchIndexManager.getIndexDirectory();
      searcher = new IndexSearcher(IndexReader.open(directory));
      Analyzer analyzer = DocumentCreator.createDocumentAnalyzer();
      QueryParser parser = new QueryParser(DocumentCreator.FIELD_TEXT,analyzer);
      
      TermQuery matchUserQuery = new TermQuery(new Term(DocumentCreator.FIELD_USER,username));
      Query inputQuery = parser.parse(query);
      BooleanQuery boolQuery = new BooleanQuery();
      boolQuery.add(matchUserQuery, BooleanClause.Occur.MUST);
      boolQuery.add(inputQuery,BooleanClause.Occur.MUST);
      
      Hits hits = searcher.search(boolQuery);

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