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:

    String f1c = f1 + ":";
    String f2c = f2 + ":";
    String q = "(" + f1c + ph1 + " OR " + f2c + ph1 + ") AND (" + f1c + ph2
        + " OR " + f2c + ph2 + ")";
    Analyzer analyzer = new WhitespaceAnalyzer();
    QueryParser qp = new QueryParser(TEST_VERSION, f1, analyzer);
    Query query = qp.parse(q);


    QueryScorer scorer = new QueryScorer(query, f1);
    scorer.setExpandMultiTermQuery(false);


    Highlighter h = new Highlighter(this, scorer);

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        String queryString = FIELD_NAME + ":[kannedy TO kznnedy]";


        // Need to explicitly set the QueryParser property to use TermRangeQuery
        // rather
        // than RangeFilters
        QueryParser parser = new QueryParser(TEST_VERSION, FIELD_NAME, analyzer);
        parser.setMultiTermRewriteMethod(MultiTermQuery.SCORING_BOOLEAN_QUERY_REWRITE);
        query = parser.parse(queryString);
        doSearching(query);


        doStandardHighlights(analyzer, searcher, hits, query, HighlighterTest.this);
        assertTrue("Failed to find correct number of highlights " + numHighlights + " found",
            numHighlights == 5);

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        synonyms.put("football", "soccer,footie");
        Analyzer analyzer = new SynonymAnalyzer(synonyms);
        String srchkey = "football";


        String s = "football-soccer in the euro 2004 footie competition";
        QueryParser parser = new QueryParser(TEST_VERSION, "bookid", analyzer);
        Query query = parser.parse(srchkey);


        TokenStream tokenStream = analyzer.tokenStream(null, new StringReader(s));


        Highlighter highlighter = getHighlighter(query, null, tokenStream, HighlighterTest.this);

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        numHighlights = 0;
        // test to show how rewritten query can still be used
        searcher = new IndexSearcher(ramDir, true);
        Analyzer analyzer = new StandardAnalyzer(TEST_VERSION);


        QueryParser parser = new QueryParser(TEST_VERSION, FIELD_NAME, analyzer);
        Query query = parser.parse("JF? or Kenned*");
        System.out.println("Searching with primitive query");
        // forget to set this and...
        // query=query.rewrite(reader);
        TopDocs hits = searcher.search(query, null, 1000);

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    IndexSearcher searchers[] = new IndexSearcher[2];
    searchers[0] = new IndexSearcher(ramDir1, true);
    searchers[1] = new IndexSearcher(ramDir2, true);
    MultiSearcher multiSearcher = new MultiSearcher(searchers);
    QueryParser parser = new QueryParser(TEST_VERSION, FIELD_NAME, new StandardAnalyzer(TEST_VERSION));
    parser.setMultiTermRewriteMethod(MultiTermQuery.SCORING_BOOLEAN_QUERY_REWRITE);
    query = parser.parse("multi*");
    System.out.println("Searching for: " + query.toString(FIELD_NAME));
    // at this point the multisearcher calls combine(query[])
    hits = multiSearcher.search(query, null, 1000);


    // query = QueryParser.parse("multi*", FIELD_NAME, new StandardAnalyzer(TEST_VERSION));

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    TestHighlightRunner helper = new TestHighlightRunner() {


      @Override
      public void run() throws Exception {
        String docMainText = "fred is one of the people";
        QueryParser parser = new QueryParser(TEST_VERSION, FIELD_NAME, analyzer);
        Query query = parser.parse("fred category:people");


        // highlighting respects fieldnames used in query


        Scorer fieldSpecificScorer = null;
        if (mode == this.QUERY) {

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        Query query;
        Highlighter highlighter;
        String result;


        query = new QueryParser(TEST_VERSION, "text", new WhitespaceAnalyzer()).parse("foo");
        highlighter = getHighlighter(query, "text", getTS2(), HighlighterTest.this);
        result = highlighter.getBestFragments(getTS2(), s, 3, "...");
        assertEquals("Hi-Speed10 <B>foo</B>", result);


        query = new QueryParser(TEST_VERSION, "text", new WhitespaceAnalyzer()).parse("10");
        highlighter = getHighlighter(query, "text", getTS2(), HighlighterTest.this);
        result = highlighter.getBestFragments(getTS2(), s, 3, "...");
        assertEquals("Hi-Speed<B>10</B> foo", result);


        query = new QueryParser(TEST_VERSION, "text", new WhitespaceAnalyzer()).parse("hi");
        highlighter = getHighlighter(query, "text", getTS2(), HighlighterTest.this);
        result = highlighter.getBestFragments(getTS2(), s, 3, "...");
        assertEquals("<B>Hi</B>-Speed10 foo", result);


        query = new QueryParser(TEST_VERSION, "text", new WhitespaceAnalyzer()).parse("speed");
        highlighter = getHighlighter(query, "text", getTS2(), HighlighterTest.this);
        result = highlighter.getBestFragments(getTS2(), s, 3, "...");
        assertEquals("Hi-<B>Speed</B>10 foo", result);


        query = new QueryParser(TEST_VERSION, "text", new WhitespaceAnalyzer()).parse("hispeed");
        highlighter = getHighlighter(query, "text", getTS2(), HighlighterTest.this);
        result = highlighter.getBestFragments(getTS2(), s, 3, "...");
        assertEquals("<B>Hi-Speed</B>10 foo", result);


        query = new QueryParser(TEST_VERSION, "text", new WhitespaceAnalyzer()).parse("hi speed");
        highlighter = getHighlighter(query, "text", getTS2(), HighlighterTest.this);
        result = highlighter.getBestFragments(getTS2(), s, 3, "...");
        assertEquals("<B>Hi-Speed</B>10 foo", result);


        // ///////////////// same tests, just put the bigger overlapping token
        // first
        query = new QueryParser(TEST_VERSION, "text", new WhitespaceAnalyzer()).parse("foo");
        highlighter = getHighlighter(query, "text", getTS2a(), HighlighterTest.this);
        result = highlighter.getBestFragments(getTS2a(), s, 3, "...");
        assertEquals("Hi-Speed10 <B>foo</B>", result);


        query = new QueryParser(TEST_VERSION, "text", new WhitespaceAnalyzer()).parse("10");
        highlighter = getHighlighter(query, "text", getTS2a(), HighlighterTest.this);
        result = highlighter.getBestFragments(getTS2a(), s, 3, "...");
        assertEquals("Hi-Speed<B>10</B> foo", result);


        query = new QueryParser(TEST_VERSION, "text", new WhitespaceAnalyzer()).parse("hi");
        highlighter = getHighlighter(query, "text", getTS2a(), HighlighterTest.this);
        result = highlighter.getBestFragments(getTS2a(), s, 3, "...");
        assertEquals("<B>Hi</B>-Speed10 foo", result);


        query = new QueryParser(TEST_VERSION, "text", new WhitespaceAnalyzer()).parse("speed");
        highlighter = getHighlighter(query, "text", getTS2a(), HighlighterTest.this);
        result = highlighter.getBestFragments(getTS2a(), s, 3, "...");
        assertEquals("Hi-<B>Speed</B>10 foo", result);


        query = new QueryParser(TEST_VERSION, "text", new WhitespaceAnalyzer()).parse("hispeed");
        highlighter = getHighlighter(query, "text", getTS2a(), HighlighterTest.this);
        result = highlighter.getBestFragments(getTS2a(), s, 3, "...");
        assertEquals("<B>Hi-Speed</B>10 foo", result);


        query = new QueryParser(TEST_VERSION, "text", new WhitespaceAnalyzer()).parse("hi speed");
        highlighter = getHighlighter(query, "text", getTS2a(), HighlighterTest.this);
        result = highlighter.getBestFragments(getTS2a(), s, 3, "...");
        assertEquals("<B>Hi-Speed</B>10 foo", result);
      }
    };

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    writer.close();
  }
  
  private void searchIndex() throws IOException, ParseException, InvalidTokenOffsetsException {
    String q = "t_text1:random";
    QueryParser parser = new QueryParser(TEST_VERSION,  "t_text1", a );
    Query query = parser.parse( q );
    IndexSearcher searcher = new IndexSearcher( dir, true );
    // This scorer can return negative idf -> null fragment
    Scorer scorer = new QueryTermScorer( query, searcher.getIndexReader(), "t_text1" );
    // This scorer doesn't use idf (patch version)
    //Scorer scorer = new QueryTermScorer( query, "t_text1" );

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    numHighlights++; // update stats used in assertions
    return "<B>" + originalText + "</B>";
  }


  public void doSearching(String queryString) throws Exception {
    QueryParser parser = new QueryParser(TEST_VERSION, FIELD_NAME, analyzer);
    parser.setEnablePositionIncrements(true);
    parser.setMultiTermRewriteMethod(MultiTermQuery.SCORING_BOOLEAN_QUERY_REWRITE);
    query = parser.parse(queryString);
    doSearching(query);
  }

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  protected Query[] prepareQueries() throws Exception {


    Analyzer anlzr = NewAnalyzerTask.createAnalyzer(config.get("analyzer",
            "org.apache.lucene.analysis.standard.StandardAnalyzer"));
    String defaultField = config.get("file.query.maker.default.field", DocMaker.BODY_FIELD);
    QueryParser qp = new QueryParser(Version.LUCENE_CURRENT, defaultField, anlzr);


    List<Query> qq = new ArrayList<Query>();
    String fileName = config.get("file.query.maker.file", null);
    if (fileName != null)
    {
      File file = new File(fileName);
      Reader reader = null;
      if (file.exists()) {
        reader = new FileReader(file);
      } else {
        //see if we can find it as a resource
        InputStream asStream = FileBasedQueryMaker.class.getClassLoader().getResourceAsStream(fileName);
        if (asStream != null) {
          reader = new InputStreamReader(asStream);
        }
      }
      if (reader != null) {
        try {
          BufferedReader buffered = new BufferedReader(reader);
          String line = null;
          int lineNum = 0;
          while ((line = buffered.readLine()) != null)
          {
            line = line.trim();
            if (!line.equals("") && !line.startsWith("#"))
            {
              Query query = null;
              try {
                query = qp.parse(line);
              } catch (ParseException e) {
                System.err.println("Exception: " + e.getMessage() + " occurred while parsing line: " + lineNum + " Text: " + line);
              }
              qq.add(query);
            }

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