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   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) 2005-2007 Zend Technologies USA Inc. (http://www.zend.com)
  19   * @license    http://framework.zend.com/license/new-bsd     New BSD License
  20   */
  21  
  22  
  23  /** Zend_Search_Lucene_Search_Weight */
  24  require_once $CFG->dirroot.'/search/Zend/Search/Lucene/Search/Weight.php';
  25  
  26  
  27  /**
  28   * @category   Zend
  29   * @package    Zend_Search_Lucene
  30   * @subpackage Search
  31   * @copyright  Copyright (c) 2005-2007 Zend Technologies USA Inc. (http://www.zend.com)
  32   * @license    http://framework.zend.com/license/new-bsd     New BSD License
  33   */
  34  class Zend_Search_Lucene_Search_Weight_Term extends Zend_Search_Lucene_Search_Weight
  35  {
  36      /**
  37       * IndexReader.
  38       *
  39       * @var Zend_Search_Lucene_Interface
  40       */
  41      private $_reader;
  42  
  43      /**
  44       * Term
  45       *
  46       * @var Zend_Search_Lucene_Index_Term
  47       */
  48      private $_term;
  49  
  50      /**
  51       * The query that this concerns.
  52       *
  53       * @var Zend_Search_Lucene_Search_Query
  54       */
  55      private $_query;
  56  
  57      /**
  58       * Score factor
  59       *
  60       * @var float
  61       */
  62      private $_idf;
  63  
  64      /**
  65       * Query weight
  66       *
  67       * @var float
  68       */
  69      private $_queryWeight;
  70  
  71  
  72      /**
  73       * Zend_Search_Lucene_Search_Weight_Term constructor
  74       * reader - index reader
  75       *
  76       * @param Zend_Search_Lucene_Index_Term   $term
  77       * @param Zend_Search_Lucene_Search_Query $query
  78       * @param Zend_Search_Lucene_Interface    $reader
  79       */
  80      public function __construct(Zend_Search_Lucene_Index_Term   $term,
  81                                  Zend_Search_Lucene_Search_Query $query,
  82                                  Zend_Search_Lucene_Interface    $reader)
  83      {
  84          $this->_term   = $term;
  85          $this->_query  = $query;
  86          $this->_reader = $reader;
  87      }
  88  
  89  
  90      /**
  91       * The sum of squared weights of contained query clauses.
  92       *
  93       * @return float
  94       */
  95      public function sumOfSquaredWeights()
  96      {
  97          // compute idf
  98          $this->_idf = $this->_reader->getSimilarity()->idf($this->_term, $this->_reader);
  99  
 100          // compute query weight
 101          $this->_queryWeight = $this->_idf * $this->_query->getBoost();
 102  
 103          // square it
 104          return $this->_queryWeight * $this->_queryWeight;
 105      }
 106  
 107  
 108      /**
 109       * Assigns the query normalization factor to this.
 110       *
 111       * @param float $queryNorm
 112       */
 113      public function normalize($queryNorm)
 114      {
 115          $this->_queryNorm = $queryNorm;
 116  
 117          // normalize query weight
 118          $this->_queryWeight *= $queryNorm;
 119  
 120          // idf for documents
 121          $this->_value = $this->_queryWeight * $this->_idf;
 122      }
 123  }
 124