231 lines
6.2 KiB
PHP
Executable File
231 lines
6.2 KiB
PHP
Executable File
<?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 the new BSD license that is bundled
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* with this package in the file LICENSE.txt.
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* It is also available through the world-wide-web at this URL:
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* http://framework.zend.com/license/new-bsd
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* If you did not receive a copy of the license and are unable to
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* obtain it through the world-wide-web, please send an email
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* to license@zend.com so we can send you a copy immediately.
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*
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* @category Zend
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* @package Zend_Search_Lucene
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* @subpackage Search
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* @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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* @version $Id: Term.php 20096 2010-01-06 02:05:09Z bkarwin $
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*/
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/**
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* Zend_Search_Lucene_Search_Query
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*/
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require_once 'Zend/Search/Lucene/Search/Query.php';
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/**
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* @category Zend
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* @package Zend_Search_Lucene
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* @subpackage Search
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* @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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*/
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class Zend_Search_Lucene_Search_Query_Term extends Zend_Search_Lucene_Search_Query
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{
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/**
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* Term to find.
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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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* Documents vector.
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*
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* @var array
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*/
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private $_docVector = null;
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/**
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* Term freqs vector.
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* array(docId => freq, ...)
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*
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* @var array
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*/
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private $_termFreqs;
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/**
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* Zend_Search_Lucene_Search_Query_Term constructor
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*
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* @param Zend_Search_Lucene_Index_Term $term
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* @param boolean $sign
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*/
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public function __construct(Zend_Search_Lucene_Index_Term $term)
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{
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$this->_term = $term;
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}
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/**
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* Re-write query into primitive queries in the context of specified index
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*
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* @param Zend_Search_Lucene_Interface $index
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* @return Zend_Search_Lucene_Search_Query
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*/
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public function rewrite(Zend_Search_Lucene_Interface $index)
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{
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if ($this->_term->field != null) {
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return $this;
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} else {
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include_once 'Zend/Search/Lucene/Search/Query/MultiTerm.php';
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$query = new Zend_Search_Lucene_Search_Query_MultiTerm();
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$query->setBoost($this->getBoost());
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include_once 'Zend/Search/Lucene/Index/Term.php';
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foreach ($index->getFieldNames(true) as $fieldName) {
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$term = new Zend_Search_Lucene_Index_Term($this->_term->text, $fieldName);
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$query->addTerm($term);
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}
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return $query->rewrite($index);
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}
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}
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/**
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* Optimize query in the context of specified index
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*
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* @param Zend_Search_Lucene_Interface $index
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* @return Zend_Search_Lucene_Search_Query
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*/
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public function optimize(Zend_Search_Lucene_Interface $index)
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{
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// Check, that index contains specified term
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if (!$index->hasTerm($this->_term)) {
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include_once 'Zend/Search/Lucene/Search/Query/Empty.php';
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return new Zend_Search_Lucene_Search_Query_Empty();
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}
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return $this;
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}
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/**
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* Constructs an appropriate Weight implementation for this query.
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*
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* @param Zend_Search_Lucene_Interface $reader
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* @return Zend_Search_Lucene_Search_Weight
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*/
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public function createWeight(Zend_Search_Lucene_Interface $reader)
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{
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include_once 'Zend/Search/Lucene/Search/Weight/Term.php';
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$this->_weight = new Zend_Search_Lucene_Search_Weight_Term($this->_term, $this, $reader);
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return $this->_weight;
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}
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/**
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* Execute query in context of index reader
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* It also initializes necessary internal structures
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*
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* @param Zend_Search_Lucene_Interface $reader
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* @param Zend_Search_Lucene_Index_DocsFilter|null $docsFilter
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*/
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public function execute(Zend_Search_Lucene_Interface $reader, $docsFilter = null)
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{
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$this->_docVector = array_flip($reader->termDocs($this->_term, $docsFilter));
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$this->_termFreqs = $reader->termFreqs($this->_term, $docsFilter);
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// Initialize weight if it's not done yet
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$this->_initWeight($reader);
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}
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/**
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* Get document ids likely matching the query
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*
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* It's an array with document ids as keys (performance considerations)
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*
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* @return array
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*/
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public function matchedDocs()
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{
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return $this->_docVector;
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}
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/**
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* Score specified document
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*
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* @param integer $docId
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* @param Zend_Search_Lucene_Interface $reader
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* @return float
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*/
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public function score($docId, Zend_Search_Lucene_Interface $reader)
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{
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if (isset($this->_docVector[$docId])) {
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return $reader->getSimilarity()->tf($this->_termFreqs[$docId]) *
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$this->_weight->getValue() *
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$reader->norm($docId, $this->_term->field) *
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$this->getBoost();
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} else {
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return 0;
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}
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}
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/**
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* Return query terms
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*
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* @return array
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*/
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public function getQueryTerms()
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{
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return array($this->_term);
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}
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/**
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* Return query term
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*
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* @return Zend_Search_Lucene_Index_Term
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*/
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public function getTerm()
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{
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return $this->_term;
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}
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/**
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* Query specific matches highlighting
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*
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* @param Zend_Search_Lucene_Search_Highlighter_Interface $highlighter Highlighter object (also contains doc for highlighting)
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*/
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protected function _highlightMatches(Zend_Search_Lucene_Search_Highlighter_Interface $highlighter)
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{
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$highlighter->highlight($this->_term->text);
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}
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/**
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* Print a query
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*
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* @return string
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*/
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public function __toString()
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{
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// It's used only for query visualisation, so we don't care about characters escaping
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if ($this->_term->field !== null) {
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$query = $this->_term->field . ':';
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} else {
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$query = '';
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}
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$query .= $this->_term->text;
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if ($this->getBoost() != 1) {
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$query = $query . '^' . round($this->getBoost(), 4);
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}
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return $query;
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}
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}
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