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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 Search
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id: Term.php 16541 2009-07-07 06:59:03Z 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) 2005-2009 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_Term extends Zend_Search_Lucene_Search_Weight
{
/**
* IndexReader.
*
* @var Zend_Search_Lucene_Interface
*/
private $_reader;
/**
* Term
*
* @var Zend_Search_Lucene_Index_Term
*/
private $_term;
/**
* The query that this concerns.
*
* @var Zend_Search_Lucene_Search_Query
*/
private $_query;
/**
* Score factor
*
* @var float
*/
private $_idf;
/**
* Query weight
*
* @var float
*/
private $_queryWeight;
/**
* Zend_Search_Lucene_Search_Weight_Term constructor
* reader - index reader
*
* @param Zend_Search_Lucene_Index_Term $term
* @param Zend_Search_Lucene_Search_Query $query
* @param Zend_Search_Lucene_Interface $reader
*/
public function __construct(Zend_Search_Lucene_Index_Term $term,
Zend_Search_Lucene_Search_Query $query,
Zend_Search_Lucene_Interface $reader)
{
$this->_term = $term;
$this->_query = $query;
$this->_reader = $reader;
}
/**
* The sum of squared weights of contained query clauses.
*
* @return float
*/
public function sumOfSquaredWeights()
{
// compute idf
$this->_idf = $this->_reader->getSimilarity()->idf($this->_term, $this->_reader);
// compute query weight
$this->_queryWeight = $this->_idf * $this->_query->getBoost();
// square it
return $this->_queryWeight * $this->_queryWeight;
}
/**
* Assigns the query normalization factor to this.
*
* @param float $queryNorm
*/
public function normalize($queryNorm)
{
$this->_queryNorm = $queryNorm;
// normalize query weight
$this->_queryWeight *= $queryNorm;
// idf for documents
$this->_value = $this->_queryWeight * $this->_idf;
}
}
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