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:


  public void testPerFieldAnalyzer() throws Exception {
    PerFieldAnalyzerWrapper analyzer = new PerFieldAnalyzerWrapper(new SimpleAnalyzer());
    analyzer.addAnalyzer("partnum", new KeywordAnalyzer());


    QueryParser queryParser = new QueryParser(Version.LUCENE_CURRENT, "description", analyzer);
    Query query = queryParser.parse("partnum:Q36 AND SPACE");


    ScoreDoc[] hits = searcher.search(query, null, 1000).scoreDocs;
    assertEquals("Q36 kept as-is",
              "+partnum:Q36 +space", query.toString("description"));
    assertEquals("doc found!", 1, hits.length);

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    "w1 xx w2 yy w3",
    "w1 w3 xx w2 yy w3"
  };


  public Query makeQuery(String queryText) throws ParseException {
    Query q = (new QueryParser(Version.LUCENE_CURRENT, field, new WhitespaceAnalyzer())).parse(queryText);
    return q;
  }

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    checkBadQuery("\"jo*  id:1 smith\""); // mixing fields in a phrase is bad
    checkBadQuery("\"jo* \"smith\" \""); // phrases inside phrases is bad
  }


  private void checkBadQuery(String qString) {
    QueryParser qp = new ComplexPhraseQueryParser(Version.LUCENE_CURRENT, defaultFieldName, analyzer);
    Throwable expected = null;
    try {
      qp.parse(qString);
    } catch (Throwable e) {
      expected = e;
    }
    assertNotNull("Expected parse error in " + qString, expected);

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  }


  private void checkMatches(String qString, String expectedVals)
      throws Exception {
    QueryParser qp = new ComplexPhraseQueryParser(Version.LUCENE_CURRENT, defaultFieldName, analyzer);
    qp.setFuzzyPrefixLength(1); // usually a good idea


    Query q = qp.parse(qString);


    HashSet expecteds = new HashSet();
    String[] vals = expectedVals.split(",");
    for (int i = 0; i < vals.length; i++) {
      if (vals[i].length() > 0)

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    addDoc("Brute willis", w);
    addDoc("B. willis", w);
    IndexReader r = w.getReader();
    w.close();


    Query q = new QueryParser(Version.LUCENE_CURRENT, "field", analyzer).parse( "giga~0.9" );


    // 3. search
    IndexSearcher searcher = new IndexSearcher(r);
    ScoreDoc[] hits = searcher.search(q, 10).scoreDocs;
    assertEquals(1, hits.length);

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    writerA.close();


    writerB.addDocument(lDoc3);
    writerB.close();


    QueryParser parser = new QueryParser(Version.LUCENE_CURRENT, "fulltext", new StandardAnalyzer(org.apache.lucene.util.Version.LUCENE_CURRENT));
    Query query = parser.parse("handle:1");


    Searcher[] searchers = new Searcher[2];
    searchers[0] = new IndexSearcher(indexStoreB, true);
    searchers[1] = new IndexSearcher(indexStoreA, true);
    Searcher mSearcher = new MultiSearcher(searchers);
    ScoreDoc[] hits = mSearcher.search(query, null, 1000).scoreDocs;


    assertEquals(3, hits.length);


    Explanation explain = mSearcher.explain(query, hits[0].doc);
    String exp = explain.toString(0);
    assertTrue(exp, exp.indexOf("maxDocs=3") > -1);
    assertTrue(exp, exp.indexOf("docFreq=3") > -1);
    
    query = parser.parse("handle:\"1 2\"");
    hits = mSearcher.search(query, null, 1000).scoreDocs;


    assertEquals(3, hits.length);


    explain = mSearcher.explain(query, hits[0].doc);

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        analyzer = new StopAnalyzer(Version.LUCENE_CURRENT);
    }




    public void testSearch() throws Exception {
      Query query = new QueryParser(Version.LUCENE_CURRENT, "contents",analyzer).parse("test");


        int numHits = searcher.search(query, null, 1000).totalHits;


        assertEquals("Find document(s)", 2, numHits);
    }

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    {
        List<RepositoryContentIndex> indexes = getHashcodeIndexes( principal, selectedRepos );


        try
        {
            QueryParser parser = new MultiFieldQueryParser( new String[]{HashcodesKeys.MD5, HashcodesKeys.SHA1},
                                           new HashcodesHandlers().getAnalyzer() );
            LuceneQuery query = new LuceneQuery( parser.parse( checksum ) );
            SearchResults results = searchAll( query, limits, indexes, null );
            results.getRepositories().addAll( this.localIndexedRepositories );


            return results;
        }

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    {
        List<RepositoryContentIndex> indexes = getBytecodeIndexes( principal, selectedRepos );


        try
        {
            QueryParser parser = new BytecodeHandlers().getQueryParser();
            LuceneQuery query = new LuceneQuery( parser.parse( term ) );
            SearchResults results = searchAll( query, limits, indexes, null );
            results.getRepositories().addAll( this.localIndexedRepositories );


            return results;
        }

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    {
        List<RepositoryContentIndex> indexes = getFileContentIndexes( principal, selectedRepos );


        try
        {
            QueryParser parser = new FileContentHandlers().getQueryParser();
            LuceneQuery query = null;
            SearchResults results = null;
            if ( previousSearchTerms == null || previousSearchTerms.isEmpty() )
            {
                query = new LuceneQuery( parser.parse( term ) );
                results = searchAll( query, limits, indexes, null );
            }
            else
            {
                // AND the previous search terms
                BooleanQuery booleanQuery = new BooleanQuery();
                for ( String previousSearchTerm : previousSearchTerms )
                {
                    booleanQuery.add( parser.parse( previousSearchTerm ), BooleanClause.Occur.MUST );
                }


                query = new LuceneQuery( booleanQuery );
                Filter filter = new QueryWrapperFilter( parser.parse( term ) );
                results = searchAll( query, limits, indexes, filter );
            }
            results.getRepositories().addAll( this.localIndexedRepositories );


            return results;

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