Term.php
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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) 2005-2007 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
/** Zend_Search_Lucene_Search_Query */
require_once 'Zend/Search/Lucene/Search/Query.php';
/** Zend_Search_Lucene_Search_Weight_Term */
require_once 'Zend/Search/Lucene/Search/Weight/Term.php';
/**
* @category Zend
* @package Zend_Search_Lucene
* @subpackage Search
* @copyright Copyright (c) 2005-2007 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Search_Lucene_Search_Query_Term extends Zend_Search_Lucene_Search_Query
{
/**
* Term to find.
*
* @var Zend_Search_Lucene_Index_Term
*/
private $_term;
/**
* Documents vector.
*
* @var array
*/
private $_docVector = null;
/**
* Term positions vector.
* Array: docId => array( pos1, pos2, ... )
*
* @var array
*/
private $_termPositions;
/**
* Zend_Search_Lucene_Search_Query_Term constructor
*
* @param Zend_Search_Lucene_Index_Term $term
* @param boolean $sign
*/
public function __construct($term)
{
$this->_term = $term;
}
/**
* Re-write query into primitive queries in the context of specified index
*
* @param Zend_Search_Lucene $index
* @return Zend_Search_Lucene_Search_Query
*/
public function rewrite(Zend_Search_Lucene $index)
{
if ($this->_term->field != null) {
return $this;
} else {
$query = new Zend_Search_Lucene_Search_Query_MultiTerm();
$query->setBoost($this->getBoost());
foreach ($index->getFieldNames(true) as $fieldName) {
$term = new Zend_Search_Lucene_Index_Term($this->_term->text, $fieldName);
$query->addTerm($term);
}
return $query->rewrite($index);
}
}
/**
* Optimize query in the context of specified index
*
* @param Zend_Search_Lucene $index
* @return Zend_Search_Lucene_Search_Query
*/
public function optimize(Zend_Search_Lucene $index)
{
// Check, that index contains specified term
if (!$index->hasTerm($this->_term)) {
return new Zend_Search_Lucene_Search_Query_Empty();
}
return $this;
}
/**
* Constructs an appropriate Weight implementation for this query.
*
* @param Zend_Search_Lucene $reader
* @return Zend_Search_Lucene_Search_Weight
*/
public function createWeight($reader)
{
$this->_weight = new Zend_Search_Lucene_Search_Weight_Term($this->_term, $this, $reader);
return $this->_weight;
}
/**
* Execute query in context of index reader
* It also initializes necessary internal structures
*
* @param Zend_Search_Lucene $reader
*/
public function execute($reader)
{
$this->_docVector = array_flip($reader->termDocs($this->_term));
$this->_termPositions = $reader->termPositions($this->_term);
// Initialize weight if it's not done yet
$this->_initWeight($reader);
}
/**
* Get document ids likely matching the query
*
* It's an array with document ids as keys (performance considerations)
*
* @return array
*/
public function matchedDocs()
{
return $this->_docVector;
}
/**
* Score specified document
*
* @param integer $docId
* @param Zend_Search_Lucene $reader
* @return float
*/
public function score( $docId, $reader )
{
if (isset($this->_docVector[$docId])) {
return $reader->getSimilarity()->tf(count($this->_termPositions[$docId]) ) *
$this->_weight->getValue() *
$reader->norm($docId, $this->_term->field) *
$this->getBoost();
} else {
return 0;
}
}
/**
* Return query terms
*
* @return array
*/
public function getQueryTerms()
{
return array($this->_term);
}
/**
* Return query term
*
* @return Zend_Search_Lucene_Index_Term
*/
public function getTerm()
{
return $this->_term;
}
/**
* Returns query term
*
* @return array
*/
public function getTerms()
{
return $this->_terms;
}
/**
* Highlight query terms
*
* @param integer &$colorIndex
* @param Zend_Search_Lucene_Document_Html $doc
*/
public function highlightMatchesDOM(Zend_Search_Lucene_Document_Html $doc, &$colorIndex)
{
$doc->highlight($this->_term->text, $this->_getHighlightColor($colorIndex));
}
/**
* Print a query
*
* @return string
*/
public function __toString()
{
// It's used only for query visualisation, so we don't care about characters escaping
return (($this->_term->field === null)? '':$this->_term->field . ':') . $this->_term->text;
}
}