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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_MultiTerm extends Zend_Search_Lucene_Search_Weight
  35  {
  36      /**
  37       * IndexReader.
  38       *
  39       * @var Zend_Search_Lucene_Interface
  40       */
  41      private $_reader;
  42  
  43      /**
  44       * The query that this concerns.
  45       *
  46       * @var Zend_Search_Lucene_Search_Query
  47       */
  48      private $_query;
  49  
  50      /**
  51       * Query terms weights
  52       * Array of Zend_Search_Lucene_Search_Weight_Term
  53       *
  54       * @var array
  55       */
  56      private $_weights;
  57  
  58  
  59      /**
  60       * Zend_Search_Lucene_Search_Weight_MultiTerm constructor
  61       * query - the query that this concerns.
  62       * reader - index reader
  63       *
  64       * @param Zend_Search_Lucene_Search_Query $query
  65       * @param Zend_Search_Lucene_Interface    $reader
  66       */
  67      public function __construct(Zend_Search_Lucene_Search_Query $query,
  68                                  Zend_Search_Lucene_Interface    $reader)
  69      {
  70          $this->_query   = $query;
  71          $this->_reader  = $reader;
  72          $this->_weights = array();
  73  
  74          $signs = $query->getSigns();
  75  
  76          foreach ($query->getTerms() as $id => $term) {
  77              if ($signs === null || $signs[$id] === null || $signs[$id]) {
  78                  $this->_weights[$id] = new Zend_Search_Lucene_Search_Weight_Term($term, $query, $reader);
  79                  $query->setWeight($id, $this->_weights[$id]);
  80              }
  81          }
  82      }
  83  
  84  
  85      /**
  86       * The weight for this query
  87       * Standard Weight::$_value is not used for boolean queries
  88       *
  89       * @return float
  90       */
  91      public function getValue()
  92      {
  93          return $this->_query->getBoost();
  94      }
  95  
  96  
  97      /**
  98       * The sum of squared weights of contained query clauses.
  99       *
 100       * @return float
 101       */
 102      public function sumOfSquaredWeights()
 103      {
 104          $sum = 0;
 105          foreach ($this->_weights as $weight) {
 106              // sum sub weights
 107              $sum += $weight->sumOfSquaredWeights();
 108          }
 109  
 110          // boost each sub-weight
 111          $sum *= $this->_query->getBoost() * $this->_query->getBoost();
 112  
 113          // check for empty query (like '-something -another')
 114          if ($sum == 0) {
 115              $sum = 1.0;
 116          }
 117          return $sum;
 118      }
 119  
 120  
 121      /**
 122       * Assigns the query normalization factor to this.
 123       *
 124       * @param float $queryNorm
 125       */
 126      public function normalize($queryNorm)
 127      {
 128          // incorporate boost
 129          $queryNorm *= $this->_query->getBoost();
 130  
 131          foreach ($this->_weights as $weight) {
 132              $weight->normalize($queryNorm);
 133          }
 134      }
 135  }
 136  
 137