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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: Boolean.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_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);
}
}
}
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