Examples of org.apache.lucene.queryparser.classic.QueryParser

Package org.apache.lucene.queryparser.classic

Examples of org.apache.lucene.queryparser.classic.QueryParser

org.apache.lucene.queryparser.classic.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}. A {@link org.apache.lucene.document.DateTools.Resolution} has to be set,if you want to use {@link DateTools} for date conversion.

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 don't use {@link DateTools} in your index, you can create your ownquery parser that inherits QueryParser and overwrites {@link #getRangeQuery(String,String,String,boolean,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:

      factory.init(params);
      Similarity simLMDir = factory.getSimilarity();
      searcher.setSimilarity(simLMDir);
    }


    QueryParser p = new QueryParser(Version.LUCENE_43, StatusField.TEXT.name,
        IndexStatuses.ANALYZER);


    TrecTopicSet topics = TrecTopicSet.fromFile(new File(topicsFile));
    for ( TrecTopic topic : topics ) {
      Query query = p.parse(topic.getQuery());
      Filter filter = NumericRangeFilter.newLongRange(StatusField.ID.name, 0L,
          topic.getQueryTweetTime(), true, true);


      TopDocs rs = searcher.search(query, filter, numResults);

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      factory.init(params);
      Similarity simLMDir = factory.getSimilarity();
      searcher.setSimilarity(simLMDir);
    }


    QueryParser p = new QueryParser(Version.LUCENE_43, IndexStatuses.StatusField.TEXT.name, IndexStatuses.ANALYZER);
    Query query = p.parse(queryText);
    Filter filter = NumericRangeFilter.newLongRange(StatusField.ID.name, 0L, maxId, true, true);


    TopDocs rs = searcher.search(query, filter, numResults);


    int i = 1;

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        if (fields.length > flags.length)
            throw new IllegalArgumentException("fields.length != flags.length");
        BooleanQuery bQuery = new BooleanQuery();
        for (int i = 0; i < fields.length; i++)
        {
            QueryParser qp = new HebrewQueryParser(matchVersion, fields[i], analyzer);
            Query q = qp.parse(query);
            if (q != null && (!(q instanceof BooleanQuery) || ((BooleanQuery)q).getClauses().length > 0))
            {
                bQuery.add(q, flags[i]);
            }
        }

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        if (queries.length != fields.length)
            throw new IllegalArgumentException("queries.length != fields.length");
        BooleanQuery bQuery = new BooleanQuery();
        for (int i = 0; i < fields.length; i++)
        {
            QueryParser qp = new HebrewQueryParser(matchVersion, fields[i], analyzer);
            Query q = qp.parse(queries[i]);
            if (q != null && (!(q instanceof BooleanQuery) || ((BooleanQuery)q).getClauses().length > 0))
            {
                bQuery.add(q, BooleanClause.Occur.SHOULD);
            }
        }

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        if (!(queries.length == fields.length && queries.length == flags.length))
            throw new IllegalArgumentException("queries, fields, and flags array have have different length");
        BooleanQuery bQuery = new BooleanQuery();
        for (int i = 0; i < fields.length; i++)
        {
            QueryParser qp = new HebrewQueryParser(matchVersion, fields[i], analyzer);
            Query q = qp.parse(queries[i]);
            if (q != null && (!(q instanceof BooleanQuery) || ((BooleanQuery)q).getClauses().length > 0))
            {
                bQuery.add(q, flags[i]);
            }
        }

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   */
  public void assertAllQueries(MemoryIndex memory, Directory ramdir, Analyzer analyzer) throws Exception {
    IndexReader reader = DirectoryReader.open(ramdir);
    IndexSearcher ram = newSearcher(reader);
    IndexSearcher mem = memory.createSearcher();
    QueryParser qp = new QueryParser(TEST_VERSION_CURRENT, "foo", analyzer);
    for (String query : queries) {
      TopDocs ramDocs = ram.search(qp.parse(query), 1);
      TopDocs memDocs = mem.search(qp.parse(query), 1);
      assertEquals(query, ramDocs.totalHits, memDocs.totalHits);
    }
    reader.close();
  }

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   */
  public boolean deleteAll(RepositoryModel repository) {
    try {
      IndexWriter writer = getWriter();
      StandardAnalyzer analyzer = new StandardAnalyzer(luceneVersion);
      QueryParser qp = new QueryParser(luceneVersion, Lucene.rid.name(), analyzer);
      BooleanQuery query = new BooleanQuery();
      query.add(qp.parse(repository.getRID()), Occur.MUST);


      int numDocsBefore = writer.numDocs();
      writer.deleteDocuments(query);
      writer.commit();
      closeSearcher();

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   * @throws Exception
   * @return true, if deleted, false if no record was deleted
   */
  private boolean delete(String repository, long ticketId, IndexWriter writer) throws Exception {
    StandardAnalyzer analyzer = new StandardAnalyzer(luceneVersion);
    QueryParser qp = new QueryParser(luceneVersion, Lucene.did.name(), analyzer);
    BooleanQuery query = new BooleanQuery();
    query.add(qp.parse(StringUtils.getSHA1(repository + ticketId)), Occur.MUST);


    int numDocsBefore = writer.numDocs();
    writer.deleteDocuments(query);
    writer.commit();
    closeSearcher();

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    Set<QueryResult> results = new LinkedHashSet<QueryResult>();
    StandardAnalyzer analyzer = new StandardAnalyzer(luceneVersion);
    try {
      // search the title, description and content
      BooleanQuery query = new BooleanQuery();
      QueryParser qp;


      qp = new QueryParser(luceneVersion, Lucene.title.name(), analyzer);
      qp.setAllowLeadingWildcard(true);
      query.add(qp.parse(text), Occur.SHOULD);


      qp = new QueryParser(luceneVersion, Lucene.body.name(), analyzer);
      qp.setAllowLeadingWildcard(true);
      query.add(qp.parse(text), Occur.SHOULD);


      qp = new QueryParser(luceneVersion, Lucene.content.name(), analyzer);
      qp.setAllowLeadingWildcard(true);
      query.add(qp.parse(text), Occur.SHOULD);


      IndexSearcher searcher = getSearcher();
      Query rewrittenQuery = searcher.rewrite(query);


      log.debug(rewrittenQuery.toString());

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    }


    Set<QueryResult> results = new LinkedHashSet<QueryResult>();
    StandardAnalyzer analyzer = new StandardAnalyzer(luceneVersion);
    try {
      QueryParser qp = new QueryParser(luceneVersion, Lucene.content.name(), analyzer);
      Query query = qp.parse(queryText);


      IndexSearcher searcher = getSearcher();
      Query rewrittenQuery = searcher.rewrite(query);


      log.debug(rewrittenQuery.toString());

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