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<?php
/**
* Zend Framework (http://framework.zend.com/)
*
* @link http://github.com/zendframework/zf2 for the canonical source repository
* @copyright Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @package Zend_Search
*/
namespace ZendSearch\Lucene\Search\Query;
use ZendSearch\Lucene;
use ZendSearch\Lucene\Search\Highlighter\HighlighterInterface as Highlighter;
use ZendSearch\Lucene\Search\Weight;
/**
* @category Zend
* @package Zend_Search_Lucene
* @subpackage Search
*/
class EmptyResult extends AbstractQuery
{
/**
* Re-write query into primitive queries in the context of specified index
*
* @param \ZendSearch\Lucene\SearchIndexInterface $index
* @return \ZendSearch\Lucene\Search\Query\AbstractQuery
*/
public function rewrite(Lucene\SearchIndexInterface $index)
{
return $this;
}
/**
* Optimize query in the context of specified index
*
* @param \ZendSearch\Lucene\SearchIndexInterface $index
* @return \ZendSearch\Lucene\Search\Query\AbstractQuery
*/
public function optimize(Lucene\SearchIndexInterface $index)
{
// "EmptyResult" query is a primitive query and don't need to be optimized
return $this;
}
/**
* Constructs an appropriate Weight implementation for this query.
*
* @param \ZendSearch\Lucene\SearchIndexInterface $reader
* @return \ZendSearch\Lucene\Search\Weight\EmptyResultWeight
*/
public function createWeight(Lucene\SearchIndexInterface $reader)
{
return new Weight\EmptyResultWeight();
}
/**
* Execute query in context of index reader
* It also initializes necessary internal structures
*
* @param \ZendSearch\Lucene\SearchIndexInterface $reader
* @param \ZendSearch\Lucene\Index\DocsFilter|null $docsFilter
*/
public function execute(Lucene\SearchIndexInterface $reader, $docsFilter = null)
{
// Do nothing
}
/**
* Get document ids likely matching the query
*
* It's an array with document ids as keys (performance considerations)
*
* @return array
*/
public function matchedDocs()
{
return array();
}
/**
* Score specified document
*
* @param integer $docId
* @param \ZendSearch\Lucene\SearchIndexInterface $reader
* @return float
*/
public function score($docId, Lucene\SearchIndexInterface $reader)
{
return 0;
}
/**
* Return query terms
*
* @return array
*/
public function getQueryTerms()
{
return array();
}
/**
* Query specific matches highlighting
*
* @param Highlighter $highlighter Highlighter object (also contains doc for highlighting)
*/
protected function _highlightMatches(Highlighter $highlighter)
{
// Do nothing
}
/**
* Print a query
*
* @return string
*/
public function __toString()
{
return '<EmptyQuery>';
}
}