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Copyright (C) Villanova University 2021.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License version 2,
as published by the Free Software Foundation.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
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/**
 * Command to fetch a Lucene helper object from a search backend.
 *
 * PHP version 8
 *
 * Copyright (C) Villanova University 2021.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * @category VuFind
 * @package  Search
 * @author   Demian Katz <demian.katz@villanova.edu>
 * @license  http://opensource.org/licenses/gpl-2.0.php GNU General Public License
 * @link     https://vufind.org
 */

namespace VuFindSearch\Command;

use VuFindSearch\Backend\BackendInterface;
use VuFindSearch\Backend\Solr\LuceneSyntaxHelper;

use function is_callable;

/**
 * Command to fetch a Lucene helper object from a search backend.
 *
 * @category VuFind
 * @package  Search
 * @author   Demian Katz <demian.katz@villanova.edu>
 * @license  http://opensource.org/licenses/gpl-2.0.php GNU General Public License
 * @link     https://vufind.org
 */
class GetLuceneHelperCommand extends \VuFindSearch\Command\AbstractBase
{
    /**
     * Constructor.
     *
     * @param string $backendId Search backend identifier
     */
    public function __construct(string $backendId)
    {
        parent::__construct($backendId, []);
    }

    /**
     * Execute command on backend.
     *
     * @param BackendInterface $backend Backend
     *
     * @return CommandInterface Command instance for method chaining
     */
    public function execute(BackendInterface $backend): CommandInterface
    {
        $this->validateBackend($backend);
        $qb = is_callable([$backend, 'getQueryBuilder'])
            ? $backend->getQueryBuilder() : false;
        $result = $qb && is_callable([$qb, 'getLuceneHelper'])
            ? $qb->getLuceneHelper() : false;
        return $this->finalizeExecution(
            $result instanceof LuceneSyntaxHelper ? $result : false
        );
    }
}
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