}

    protected org.apache.lucene.queryparser.classic.QueryParser createQueryParser() {
        final LuceneQueryParser parser = new LuceneQueryParser(defaultField, analyzer);
        parser.setAllowLeadingWildcard(allowLeadingWildcard);
        parser.setDefaultOperator(defaultOperator);
        return parser;
    }

    public void setDefaultField(final String defaultField) {
        this.defaultField = defaultField;
    }

        final CmdLineParser parser = new CmdLineParser(options);
        try {
            parser.parseArgument(args);
        } catch (final CmdLineException e) {
            System.err.println(e.getMessage());
            System.err.println("java " + Crawler.class.getCanonicalName() + " [options...] arguments...");
            parser.printUsage(System.err);
            return;
        }

            final SAXParser parser = factory.newSAXParser();
            parser.setProperty(XMLConstants.ACCESS_EXTERNAL_DTD, StringUtil.EMPTY);
            parser.setProperty(XMLConstants.ACCESS_EXTERNAL_SCHEMA, StringUtil.EMPTY);
            parser.parse(is, this);
        } catch (final Exception e) {