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<?php /** * Zend Framework * * LICENSE * * This source file is subject to the new BSD license that is bundled * with this package in the file LICENSE.txt. * It is also available through the world-wide-web at this URL: * http://framework.zend.com/license/new-bsd * If you did not receive a copy of the license and are unable to * obtain it through the world-wide-web, please send an email * to license@zend.com so we can send you a copy immediately. * * @category Zend * @package Zend_Search_Lucene * @subpackage Analysis * @copyright Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com) * @license http://framework.zend.com/license/new-bsd New BSD License */ /** Zend_Search_Lucene_Analysis_Analyzer */ require_once 'Zend/Search/Lucene/Analysis/Analyzer.php'; /** * Common implementation of the Zend_Search_Lucene_Analysis_Analyzer interface. * There are several standard standard subclasses provided by Zend_Search_Lucene/Analysis * subpackage: Zend_Search_Lucene_Analysis_Analyzer_Common_Text, ZSearchHTMLAnalyzer, ZSearchXMLAnalyzer. * * @todo ZSearchHTMLAnalyzer and ZSearchXMLAnalyzer implementation * * @category Zend * @package Zend_Search_Lucene * @subpackage Analysis * @copyright Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com) * @license http://framework.zend.com/license/new-bsd New BSD License */ abstract class Zend_Search_Lucene_Analysis_Analyzer_Common extends Zend_Search_Lucene_Analysis_Analyzer { /** * The set of Token filters applied to the Token stream. * Array of Zend_Search_Lucene_Analysis_TokenFilter objects. * * @var array */ private $_filters = array(); /** * Add Token filter to the Analyzer * * @param Zend_Search_Lucene_Analysis_TokenFilter $filter */ public function addFilter(Zend_Search_Lucene_Analysis_TokenFilter $filter) { $this->_filters[] = $filter; } /** * Apply filters to the token. Can return null when the token was removed. * * @param Zend_Search_Lucene_Analysis_Token $token * @return Zend_Search_Lucene_Analysis_Token */ public function normalize(Zend_Search_Lucene_Analysis_Token $token) { foreach ($this->_filters as $filter) { $token = $filter->normalize($token); // resulting token can be null if the filter removes it if (is_null($token)) { return null; } } return $token; } }
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