/lib/vendor/Zend/Search/Lucene/Search/Weight/Boolean.php
PHP | 137 lines | 44 code | 21 blank | 72 comment | 5 complexity | b494eff3c495ea3ab048d1b692d23599 MD5 | raw file
Possible License(s): BSD-3-Clause
- <?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 Search
- * @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
- * @license http://framework.zend.com/license/new-bsd New BSD License
- * @version $Id: Boolean.php 20096 2010-01-06 02:05:09Z bkarwin $
- */
- /** Zend_Search_Lucene_Search_Weight */
- require_once 'Zend/Search/Lucene/Search/Weight.php';
- /**
- * @category Zend
- * @package Zend_Search_Lucene
- * @subpackage Search
- * @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
- * @license http://framework.zend.com/license/new-bsd New BSD License
- */
- class Zend_Search_Lucene_Search_Weight_Boolean extends Zend_Search_Lucene_Search_Weight
- {
- /**
- * IndexReader.
- *
- * @var Zend_Search_Lucene_Interface
- */
- private $_reader;
- /**
- * The query that this concerns.
- *
- * @var Zend_Search_Lucene_Search_Query
- */
- private $_query;
- /**
- * Queries weights
- * Array of Zend_Search_Lucene_Search_Weight
- *
- * @var array
- */
- private $_weights;
- /**
- * Zend_Search_Lucene_Search_Weight_Boolean constructor
- * query - the query that this concerns.
- * reader - index reader
- *
- * @param Zend_Search_Lucene_Search_Query $query
- * @param Zend_Search_Lucene_Interface $reader
- */
- public function __construct(Zend_Search_Lucene_Search_Query $query,
- Zend_Search_Lucene_Interface $reader)
- {
- $this->_query = $query;
- $this->_reader = $reader;
- $this->_weights = array();
- $signs = $query->getSigns();
- foreach ($query->getSubqueries() as $num => $subquery) {
- if ($signs === null || $signs[$num] === null || $signs[$num]) {
- $this->_weights[$num] = $subquery->createWeight($reader);
- }
- }
- }
- /**
- * The weight for this query
- * Standard Weight::$_value is not used for boolean queries
- *
- * @return float
- */
- public function getValue()
- {
- return $this->_query->getBoost();
- }
- /**
- * The sum of squared weights of contained query clauses.
- *
- * @return float
- */
- public function sumOfSquaredWeights()
- {
- $sum = 0;
- foreach ($this->_weights as $weight) {
- // sum sub weights
- $sum += $weight->sumOfSquaredWeights();
- }
- // boost each sub-weight
- $sum *= $this->_query->getBoost() * $this->_query->getBoost();
- // check for empty query (like '-something -another')
- if ($sum == 0) {
- $sum = 1.0;
- }
- return $sum;
- }
- /**
- * Assigns the query normalization factor to this.
- *
- * @param float $queryNorm
- */
- public function normalize($queryNorm)
- {
- // incorporate boost
- $queryNorm *= $this->_query->getBoost();
- foreach ($this->_weights as $weight) {
- $weight->normalize($queryNorm);
- }
- }
- }