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Revision Autor Zeilennr. Zeile
1 lars 1 
<?php
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/**
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 * Zend Framework
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 *
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 * LICENSE
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 *
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 * This source file is subject to version 1.0 of the Zend Framework
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 * license, that is bundled with this package in the file LICENSE, and
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 * is available through the world-wide-web at the following URL:
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 * http://www.zend.com/license/framework/1_0.txt. If you did not receive
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 * a copy of the Zend Framework license and are unable to obtain it
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 * through the world-wide-web, please send a note to license@zend.com
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 * so we can mail you a copy immediately.
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 *
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 * @package    Zend_Search_Lucene
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 * @subpackage Search
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 * @copyright  Copyright (c) 2005-2006 Zend Technologies USA Inc. (http://www.zend.com)
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 * @license    http://www.zend.com/license/framework/1_0.txt Zend Framework License version 1.0
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 */
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/** Zend_Search_Lucene_Search_Weight */
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require_once 'Zend/Search/Lucene/Search/Weight.php';
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/**
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 * @package    Zend_Search_Lucene
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 * @subpackage Search
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 * @copyright  Copyright (c) 2005-2006 Zend Technologies USA Inc. (http://www.zend.com)
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 * @license    http://www.zend.com/license/framework/1_0.txt Zend Framework License version 1.0
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 */
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class Zend_Search_Lucene_Search_Weight_Term extends Zend_Search_Lucene_Search_Weight
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{
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    /**
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     * IndexReader.
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     *
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     * @var Zend_Search_Lucene
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     */
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    private $_reader;
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    /**
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     * Term
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     *
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     * @var Zend_Search_Lucene_Index_Term
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     */
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    private $_term;
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    /**
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     * The query that this concerns.
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     *
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     * @var Zend_Search_Lucene_Search_Query
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     */
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    private $_query;
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    /**
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     * Weight value
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     *
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     * @var float
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     */
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    private $_value;
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    /**
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     * Score factor
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     *
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     * @var float
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     */
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    private $_idf;
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    /**
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     * Normalization factor
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     *
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     * @var float
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     */
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    private $_queryNorm;
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    /**
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     * Query weight
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     *
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     * @var float
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     */
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    private $_queryWeight;
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    /**
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     * Zend_Search_Lucene_Search_Weight_Term constructor
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     * reader - index reader
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     *
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     * @param Zend_Search_Lucene $reader
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     */
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    public function __construct($term, $query, $reader)
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    {
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        $this->_term   = $term;
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        $this->_query  = $query;
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        $this->_reader = $reader;
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    }
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    /**
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     * The weight for this query
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     *
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     * @return float
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     */
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    public function getValue()
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    {
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        return $this->_value;
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    }
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    /**
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     * The sum of squared weights of contained query clauses.
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     *
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     * @return float
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     */
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    public function sumOfSquaredWeights()
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    {
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        // compute idf
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        $this->_idf = $this->_reader->getSimilarity()->idf($this->_term, $this->_reader);
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        // compute query weight
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        $this->_queryWeight = $this->_idf * $this->_query->getBoost();
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        // square it
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        return $this->_queryWeight * $this->_queryWeight;
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    }
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    /**
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     * Assigns the query normalization factor to this.
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     *
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     * @param float $queryNorm
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     */
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    public function normalize($queryNorm)
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    {
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        $this->_queryNorm = $queryNorm;
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        // normalize query weight
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        $this->_queryWeight *= $queryNorm;
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        // idf for documents
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        $this->_value = $this->_queryWeight * $this->_idf;
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    }
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}
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