86 lines
2.4 KiB
PHP
Executable File
86 lines
2.4 KiB
PHP
Executable File
<?php
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/**
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* Zend Framework
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*
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* LICENSE
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*
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* This source file is subject to the new BSD license that is bundled
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* with this package in the file LICENSE.txt.
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* It is also available through the world-wide-web at this URL:
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* http://framework.zend.com/license/new-bsd
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* If you did not receive a copy of the license and are unable to
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* obtain it through the world-wide-web, please send an email
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* to license@zend.com so we can send you a copy immediately.
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*
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* @category Zend
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* @package Zend_Search_Lucene
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* @subpackage Search
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* @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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* @version $Id: Weight.php 20096 2010-01-06 02:05:09Z bkarwin $
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*/
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/**
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* Calculate query weights and build query scorers.
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*
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* A Weight is constructed by a query Query->createWeight().
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* The sumOfSquaredWeights() method is then called on the top-level
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* query to compute the query normalization factor Similarity->queryNorm(float).
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* This factor is then passed to normalize(float). At this point the weighting
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* is complete.
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*
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* @category Zend
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* @package Zend_Search_Lucene
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* @subpackage Search
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* @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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*/
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abstract class Zend_Search_Lucene_Search_Weight
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{
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/**
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* Normalization factor.
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* This value is stored only for query expanation purpose and not used in any other place
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*
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* @var float
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*/
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protected $_queryNorm;
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/**
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* Weight value
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*
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* Weight value may be initialized in sumOfSquaredWeights() or normalize()
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* because they both are invoked either in Query::_initWeight (for top-level query) or
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* in corresponding methods of parent query's weights
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*
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* @var float
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*/
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protected $_value;
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/**
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* The weight for this query.
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*
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* @return float
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*/
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public function getValue()
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{
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return $this->_value;
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}
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/**
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* The sum of squared weights of contained query clauses.
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*
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* @return float
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*/
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abstract public function sumOfSquaredWeights();
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/**
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* Assigns the query normalization factor to this.
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*
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* @param $norm
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*/
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abstract public function normalize($norm);
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}
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