git.roojs.org Git - web.mtrack/blob - inc/lib/Zend/Search/Lucene/Search/Weight/Term.php

   1 <?php
   2 /**
   3  * Zend Framework
   4  *
   5  * LICENSE
   6  *
   7  * This source file is subject to the new BSD license that is bundled
   8  * with this package in the file LICENSE.txt.
   9  * It is also available through the world-wide-web at this URL:
  10  * http://framework.zend.com/license/new-bsd
  11  * If you did not receive a copy of the license and are unable to
  12  * obtain it through the world-wide-web, please send an email
  13  * to license@zend.com so we can send you a copy immediately.
  14  *
  15  * @category   Zend
  16  * @package    Zend_Search_Lucene
  17  * @subpackage Search
  18  * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
  19  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  20  * @version    $Id: Term.php 16541 2009-07-07 06:59:03Z bkarwin $
  21  */
  22
  23
  24 /** Zend_Search_Lucene_Search_Weight */
  25 require_once 'Zend/Search/Lucene/Search/Weight.php';
  26
  27
  28 /**
  29  * @category   Zend
  30  * @package    Zend_Search_Lucene
  31  * @subpackage Search
  32  * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
  33  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  34  */
  35 class Zend_Search_Lucene_Search_Weight_Term extends Zend_Search_Lucene_Search_Weight
  36 {
  37     /**
  38      * IndexReader.
  39      *
  40      * @var Zend_Search_Lucene_Interface
  41      */
  42     private $_reader;
  43
  44     /**
  45      * Term
  46      *
  47      * @var Zend_Search_Lucene_Index_Term
  48      */
  49     private $_term;
  50
  51     /**
  52      * The query that this concerns.
  53      *
  54      * @var Zend_Search_Lucene_Search_Query
  55      */
  56     private $_query;
  57
  58     /**
  59      * Score factor
  60      *
  61      * @var float
  62      */
  63     private $_idf;
  64
  65     /**
  66      * Query weight
  67      *
  68      * @var float
  69      */
  70     private $_queryWeight;
  71
  72
  73     /**
  74      * Zend_Search_Lucene_Search_Weight_Term constructor
  75      * reader - index reader
  76      *
  77      * @param Zend_Search_Lucene_Index_Term   $term
  78      * @param Zend_Search_Lucene_Search_Query $query
  79      * @param Zend_Search_Lucene_Interface    $reader
  80      */
  81     public function __construct(Zend_Search_Lucene_Index_Term   $term,
  82                                 Zend_Search_Lucene_Search_Query $query,
  83                                 Zend_Search_Lucene_Interface    $reader)
  84     {
  85         $this->_term   = $term;
  86         $this->_query  = $query;
  87         $this->_reader = $reader;
  88     }
  89
  90
  91     /**
  92      * The sum of squared weights of contained query clauses.
  93      *
  94      * @return float
  95      */
  96     public function sumOfSquaredWeights()
  97     {
  98         // compute idf
  99         $this->_idf = $this->_reader->getSimilarity()->idf($this->_term, $this->_reader);
 100
 101         // compute query weight
 102         $this->_queryWeight = $this->_idf * $this->_query->getBoost();
 103
 104         // square it
 105         return $this->_queryWeight * $this->_queryWeight;
 106     }
 107
 108
 109     /**
 110      * Assigns the query normalization factor to this.
 111      *
 112      * @param float $queryNorm
 113      */
 114     public function normalize($queryNorm)
 115     {
 116         $this->_queryNorm = $queryNorm;
 117
 118         // normalize query weight
 119         $this->_queryWeight *= $queryNorm;
 120
 121         // idf for documents
 122         $this->_value = $this->_queryWeight * $this->_idf;
 123     }
 124 }
 125