829 lines
27 KiB
PHP
Executable File
829 lines
27 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: Boolean.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_Boolean extends Zend_Search_Lucene_Search_Query
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{
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/**
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* Subqueries
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* Array of Zend_Search_Lucene_Search_Query
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*
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* @var array
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*/
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private $_subqueries = array();
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/**
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* Subqueries signs.
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* If true then subquery is required.
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* If false then subquery is prohibited.
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* If null then subquery is neither prohibited, nor required
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*
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* If array is null then all subqueries are required
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*
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* @var array
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*/
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private $_signs = array();
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/**
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* Result vector.
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*
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* @var array
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*/
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private $_resVector = null;
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/**
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* A score factor based on the fraction of all query subqueries
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* that a document contains.
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* float for conjunction queries
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* array of float for non conjunction queries
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*
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* @var mixed
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*/
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private $_coord = null;
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/**
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* Class constructor. Create a new Boolean query object.
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*
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* if $signs array is omitted then all subqueries are required
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* it differs from addSubquery() behavior, but should never be used
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*
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* @param array $subqueries Array of Zend_Search_Search_Query objects
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* @param array $signs Array of signs. Sign is boolean|null.
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* @return void
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*/
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public function __construct($subqueries = null, $signs = null)
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{
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if (is_array($subqueries)) {
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$this->_subqueries = $subqueries;
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$this->_signs = null;
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// Check if all subqueries are required
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if (is_array($signs)) {
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foreach ($signs as $sign ) {
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if ($sign !== true) {
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$this->_signs = $signs;
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break;
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}
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}
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}
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}
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}
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/**
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* Add a $subquery (Zend_Search_Lucene_Search_Query) to this query.
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*
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* The sign is specified as:
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* TRUE - subquery is required
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* FALSE - subquery is prohibited
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* NULL - subquery is neither prohibited, nor required
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*
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* @param Zend_Search_Lucene_Search_Query $subquery
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* @param boolean|null $sign
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* @return void
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*/
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public function addSubquery(Zend_Search_Lucene_Search_Query $subquery, $sign=null)
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{
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if ($sign !== true || $this->_signs !== null) { // Skip, if all subqueries are required
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if ($this->_signs === null) { // Check, If all previous subqueries are required
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$this->_signs = array();
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foreach ($this->_subqueries as $prevSubquery) {
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$this->_signs[] = true;
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}
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}
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$this->_signs[] = $sign;
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}
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$this->_subqueries[] = $subquery;
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}
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/**
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* Re-write queries into primitive queries
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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 $index)
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{
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$query = new Zend_Search_Lucene_Search_Query_Boolean();
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$query->setBoost($this->getBoost());
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foreach ($this->_subqueries as $subqueryId => $subquery) {
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$query->addSubquery(
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$subquery->rewrite($index),
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($this->_signs === null)? true : $this->_signs[$subqueryId]
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);
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}
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return $query;
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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 $index)
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{
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$subqueries = array();
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$signs = array();
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// Optimize all subqueries
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foreach ($this->_subqueries as $id => $subquery) {
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$subqueries[] = $subquery->optimize($index);
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$signs[] = ($this->_signs === null)? true : $this->_signs[$id];
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}
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// Remove insignificant subqueries
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foreach ($subqueries as $id => $subquery) {
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if ($subquery instanceof Zend_Search_Lucene_Search_Query_Insignificant) {
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// Insignificant subquery has to be removed anyway
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unset($subqueries[$id]);
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unset($signs[$id]);
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}
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}
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if (count($subqueries) == 0) {
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// Boolean query doesn't has non-insignificant subqueries
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include_once 'Zend/Search/Lucene/Search/Query/Insignificant.php';
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return new Zend_Search_Lucene_Search_Query_Insignificant();
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}
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// Check if all non-insignificant subqueries are prohibited
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$allProhibited = true;
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foreach ($signs as $sign) {
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if ($sign !== false) {
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$allProhibited = false;
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break;
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}
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}
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if ($allProhibited) {
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include_once 'Zend/Search/Lucene/Search/Query/Insignificant.php';
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return new Zend_Search_Lucene_Search_Query_Insignificant();
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}
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// Check for empty subqueries
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foreach ($subqueries as $id => $subquery) {
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if ($subquery instanceof Zend_Search_Lucene_Search_Query_Empty) {
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if ($signs[$id] === true) {
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// Matching is required, but is actually empty
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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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} else {
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// Matching is optional or prohibited, but is empty
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// Remove it from subqueries and signs list
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unset($subqueries[$id]);
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unset($signs[$id]);
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}
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}
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}
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// Check, if reduced subqueries list is empty
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if (count($subqueries) == 0) {
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include_once 'Zend/Search/Lucene/Search/Query/Empty.php';
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return new Zend_Search_Lucene_Search_Query_Empty();
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}
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// Check if all non-empty subqueries are prohibited
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$allProhibited = true;
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foreach ($signs as $sign) {
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if ($sign !== false) {
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$allProhibited = false;
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break;
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}
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}
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if ($allProhibited) {
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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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// Check, if reduced subqueries list has only one entry
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if (count($subqueries) == 1) {
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// It's a query with only one required or optional clause
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// (it's already checked, that it's not a prohibited clause)
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if ($this->getBoost() == 1) {
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return reset($subqueries);
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}
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$optimizedQuery = clone reset($subqueries);
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$optimizedQuery->setBoost($optimizedQuery->getBoost()*$this->getBoost());
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return $optimizedQuery;
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}
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// Prepare first candidate for optimized query
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$optimizedQuery = new Zend_Search_Lucene_Search_Query_Boolean($subqueries, $signs);
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$optimizedQuery->setBoost($this->getBoost());
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$terms = array();
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$tsigns = array();
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$boostFactors = array();
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// Try to decompose term and multi-term subqueries
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foreach ($subqueries as $id => $subquery) {
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if ($subquery instanceof Zend_Search_Lucene_Search_Query_Term) {
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$terms[] = $subquery->getTerm();
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$tsigns[] = $signs[$id];
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$boostFactors[] = $subquery->getBoost();
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// remove subquery from a subqueries list
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unset($subqueries[$id]);
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unset($signs[$id]);
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} else if ($subquery instanceof Zend_Search_Lucene_Search_Query_MultiTerm) {
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$subTerms = $subquery->getTerms();
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$subSigns = $subquery->getSigns();
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if ($signs[$id] === true) {
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// It's a required multi-term subquery.
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// Something like '... +(+term1 -term2 term3 ...) ...'
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// Multi-term required subquery can be decomposed only if it contains
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// required terms and doesn't contain prohibited terms:
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// ... +(+term1 term2 ...) ... => ... +term1 term2 ...
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//
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// Check this
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$hasRequired = false;
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$hasProhibited = false;
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if ($subSigns === null) {
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// All subterms are required
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$hasRequired = true;
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} else {
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foreach ($subSigns as $sign) {
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if ($sign === true) {
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$hasRequired = true;
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} else if ($sign === false) {
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$hasProhibited = true;
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break;
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}
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}
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}
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// Continue if subquery has prohibited terms or doesn't have required terms
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if ($hasProhibited || !$hasRequired) {
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continue;
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}
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foreach ($subTerms as $termId => $term) {
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$terms[] = $term;
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$tsigns[] = ($subSigns === null)? true : $subSigns[$termId];
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$boostFactors[] = $subquery->getBoost();
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}
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// remove subquery from a subqueries list
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unset($subqueries[$id]);
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unset($signs[$id]);
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} else { // $signs[$id] === null || $signs[$id] === false
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// It's an optional or prohibited multi-term subquery.
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// Something like '... (+term1 -term2 term3 ...) ...'
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// or
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// something like '... -(+term1 -term2 term3 ...) ...'
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// Multi-term optional and required subqueries can be decomposed
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// only if all terms are optional.
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//
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// Check if all terms are optional.
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$onlyOptional = true;
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if ($subSigns === null) {
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// All subterms are required
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$onlyOptional = false;
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} else {
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foreach ($subSigns as $sign) {
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if ($sign !== null) {
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$onlyOptional = false;
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break;
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}
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}
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}
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// Continue if non-optional terms are presented in this multi-term subquery
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if (!$onlyOptional) {
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continue;
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}
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foreach ($subTerms as $termId => $term) {
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$terms[] = $term;
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$tsigns[] = ($signs[$id] === null)? null /* optional */ :
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false /* prohibited */;
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$boostFactors[] = $subquery->getBoost();
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}
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// remove subquery from a subqueries list
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unset($subqueries[$id]);
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unset($signs[$id]);
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}
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}
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}
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// Check, if there are no decomposed subqueries
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if (count($terms) == 0 ) {
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// return prepared candidate
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return $optimizedQuery;
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}
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// Check, if all subqueries have been decomposed and all terms has the same boost factor
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if (count($subqueries) == 0 && count(array_unique($boostFactors)) == 1) {
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include_once 'Zend/Search/Lucene/Search/Query/MultiTerm.php';
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$optimizedQuery = new Zend_Search_Lucene_Search_Query_MultiTerm($terms, $tsigns);
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$optimizedQuery->setBoost(reset($boostFactors)*$this->getBoost());
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return $optimizedQuery;
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}
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// This boolean query can't be transformed to Term/MultiTerm query and still contains
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// several subqueries
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// Separate prohibited terms
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$prohibitedTerms = array();
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foreach ($terms as $id => $term) {
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if ($tsigns[$id] === false) {
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$prohibitedTerms[] = $term;
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unset($terms[$id]);
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unset($tsigns[$id]);
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unset($boostFactors[$id]);
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}
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}
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if (count($terms) == 1) {
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include_once 'Zend/Search/Lucene/Search/Query/Term.php';
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$clause = new Zend_Search_Lucene_Search_Query_Term(reset($terms));
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$clause->setBoost(reset($boostFactors));
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$subqueries[] = $clause;
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$signs[] = reset($tsigns);
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// Clear terms list
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$terms = array();
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} else if (count($terms) > 1 && count(array_unique($boostFactors)) == 1) {
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include_once 'Zend/Search/Lucene/Search/Query/MultiTerm.php';
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$clause = new Zend_Search_Lucene_Search_Query_MultiTerm($terms, $tsigns);
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$clause->setBoost(reset($boostFactors));
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$subqueries[] = $clause;
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// Clause sign is 'required' if clause contains required terms. 'Optional' otherwise.
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$signs[] = (in_array(true, $tsigns))? true : null;
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// Clear terms list
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$terms = array();
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}
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if (count($prohibitedTerms) == 1) {
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// (boost factors are not significant for prohibited clauses)
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include_once 'Zend/Search/Lucene/Search/Query/Term.php';
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$subqueries[] = new Zend_Search_Lucene_Search_Query_Term(reset($prohibitedTerms));
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$signs[] = false;
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// Clear prohibited terms list
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$prohibitedTerms = array();
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} else if (count($prohibitedTerms) > 1) {
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// prepare signs array
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$prohibitedSigns = array();
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foreach ($prohibitedTerms as $id => $term) {
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// all prohibited term are grouped as optional into multi-term query
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$prohibitedSigns[$id] = null;
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}
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// (boost factors are not significant for prohibited clauses)
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include_once 'Zend/Search/Lucene/Search/Query/MultiTerm.php';
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$subqueries[] = new Zend_Search_Lucene_Search_Query_MultiTerm($prohibitedTerms, $prohibitedSigns);
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// Clause sign is 'prohibited'
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$signs[] = false;
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// Clear terms list
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$prohibitedTerms = array();
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}
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/**
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* @todo Group terms with the same boost factors together
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*/
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// Check, that all terms are processed
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// Replace candidate for optimized query
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if (count($terms) == 0 && count($prohibitedTerms) == 0) {
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$optimizedQuery = new Zend_Search_Lucene_Search_Query_Boolean($subqueries, $signs);
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$optimizedQuery->setBoost($this->getBoost());
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}
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return $optimizedQuery;
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}
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/**
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* Returns subqueries
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*
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* @return array
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*/
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public function getSubqueries()
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{
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return $this->_subqueries;
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}
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/**
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* Return subqueries signs
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*
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* @return array
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*/
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public function getSigns()
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{
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return $this->_signs;
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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 $reader)
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{
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include_once 'Zend/Search/Lucene/Search/Weight/Boolean.php';
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$this->_weight = new Zend_Search_Lucene_Search_Weight_Boolean($this, $reader);
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return $this->_weight;
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}
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/**
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* Calculate result vector for Conjunction query
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* (like '<subquery1> AND <subquery2> AND <subquery3>')
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*/
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private function _calculateConjunctionResult()
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{
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$this->_resVector = null;
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if (count($this->_subqueries) == 0) {
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$this->_resVector = array();
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}
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$resVectors = array();
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$resVectorsSizes = array();
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$resVectorsIds = array(); // is used to prevent arrays comparison
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foreach ($this->_subqueries as $subqueryId => $subquery) {
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$resVectors[] = $subquery->matchedDocs();
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$resVectorsSizes[] = count(end($resVectors));
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$resVectorsIds[] = $subqueryId;
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}
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// sort resvectors in order of subquery cardinality increasing
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array_multisort(
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$resVectorsSizes, SORT_ASC, SORT_NUMERIC,
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$resVectorsIds, SORT_ASC, SORT_NUMERIC,
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$resVectors
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);
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foreach ($resVectors as $nextResVector) {
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if($this->_resVector === null) {
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$this->_resVector = $nextResVector;
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} else {
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//$this->_resVector = array_intersect_key($this->_resVector, $nextResVector);
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|
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/**
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* This code is used as workaround for array_intersect_key() slowness problem.
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*/
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$updatedVector = array();
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foreach ($this->_resVector as $id => $value) {
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if (isset($nextResVector[$id])) {
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$updatedVector[$id] = $value;
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}
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}
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$this->_resVector = $updatedVector;
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}
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if (count($this->_resVector) == 0) {
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// Empty result set, we don't need to check other terms
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break;
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}
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}
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|
|
// ksort($this->_resVector, SORT_NUMERIC);
|
|
// Used algorithm doesn't change elements order
|
|
}
|
|
|
|
|
|
/**
|
|
* Calculate result vector for non Conjunction query
|
|
* (like '<subquery1> AND <subquery2> AND NOT <subquery3> OR <subquery4>')
|
|
*/
|
|
private function _calculateNonConjunctionResult()
|
|
{
|
|
$requiredVectors = array();
|
|
$requiredVectorsSizes = array();
|
|
$requiredVectorsIds = array(); // is used to prevent arrays comparison
|
|
|
|
$optional = array();
|
|
|
|
foreach ($this->_subqueries as $subqueryId => $subquery) {
|
|
if ($this->_signs[$subqueryId] === true) {
|
|
// required
|
|
$requiredVectors[] = $subquery->matchedDocs();
|
|
$requiredVectorsSizes[] = count(end($requiredVectors));
|
|
$requiredVectorsIds[] = $subqueryId;
|
|
} elseif ($this->_signs[$subqueryId] === false) {
|
|
// prohibited
|
|
// Do nothing. matchedDocs() may include non-matching id's
|
|
// Calculating prohibited vector may take significant time, but do not affect the result
|
|
// Skipped.
|
|
} else {
|
|
// neither required, nor prohibited
|
|
// array union
|
|
$optional += $subquery->matchedDocs();
|
|
}
|
|
}
|
|
|
|
// sort resvectors in order of subquery cardinality increasing
|
|
array_multisort(
|
|
$requiredVectorsSizes, SORT_ASC, SORT_NUMERIC,
|
|
$requiredVectorsIds, SORT_ASC, SORT_NUMERIC,
|
|
$requiredVectors
|
|
);
|
|
|
|
$required = null;
|
|
foreach ($requiredVectors as $nextResVector) {
|
|
if($required === null) {
|
|
$required = $nextResVector;
|
|
} else {
|
|
//$required = array_intersect_key($required, $nextResVector);
|
|
|
|
/**
|
|
* This code is used as workaround for array_intersect_key() slowness problem.
|
|
*/
|
|
$updatedVector = array();
|
|
foreach ($required as $id => $value) {
|
|
if (isset($nextResVector[$id])) {
|
|
$updatedVector[$id] = $value;
|
|
}
|
|
}
|
|
$required = $updatedVector;
|
|
}
|
|
|
|
if (count($required) == 0) {
|
|
// Empty result set, we don't need to check other terms
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
if ($required !== null) {
|
|
$this->_resVector = &$required;
|
|
} else {
|
|
$this->_resVector = &$optional;
|
|
}
|
|
|
|
ksort($this->_resVector, SORT_NUMERIC);
|
|
}
|
|
|
|
|
|
/**
|
|
* Score calculator for conjunction queries (all subqueries are required)
|
|
*
|
|
* @param integer $docId
|
|
* @param Zend_Search_Lucene_Interface $reader
|
|
* @return float
|
|
*/
|
|
public function _conjunctionScore($docId, Zend_Search_Lucene_Interface $reader)
|
|
{
|
|
if ($this->_coord === null) {
|
|
$this->_coord = $reader->getSimilarity()->coord(
|
|
count($this->_subqueries),
|
|
count($this->_subqueries)
|
|
);
|
|
}
|
|
|
|
$score = 0;
|
|
|
|
foreach ($this->_subqueries as $subquery) {
|
|
$subscore = $subquery->score($docId, $reader);
|
|
|
|
if ($subscore == 0) {
|
|
return 0;
|
|
}
|
|
|
|
$score += $subquery->score($docId, $reader) * $this->_coord;
|
|
}
|
|
|
|
return $score * $this->_coord * $this->getBoost();
|
|
}
|
|
|
|
|
|
/**
|
|
* Score calculator for non conjunction queries (not all subqueries are required)
|
|
*
|
|
* @param integer $docId
|
|
* @param Zend_Search_Lucene_Interface $reader
|
|
* @return float
|
|
*/
|
|
public function _nonConjunctionScore($docId, Zend_Search_Lucene_Interface $reader)
|
|
{
|
|
if ($this->_coord === null) {
|
|
$this->_coord = array();
|
|
|
|
$maxCoord = 0;
|
|
foreach ($this->_signs as $sign) {
|
|
if ($sign !== false /* not prohibited */) {
|
|
$maxCoord++;
|
|
}
|
|
}
|
|
|
|
for ($count = 0; $count <= $maxCoord; $count++) {
|
|
$this->_coord[$count] = $reader->getSimilarity()->coord($count, $maxCoord);
|
|
}
|
|
}
|
|
|
|
$score = 0;
|
|
$matchedSubqueries = 0;
|
|
foreach ($this->_subqueries as $subqueryId => $subquery) {
|
|
$subscore = $subquery->score($docId, $reader);
|
|
|
|
// Prohibited
|
|
if ($this->_signs[$subqueryId] === false && $subscore != 0) {
|
|
return 0;
|
|
}
|
|
|
|
// is required, but doen't match
|
|
if ($this->_signs[$subqueryId] === true && $subscore == 0) {
|
|
return 0;
|
|
}
|
|
|
|
if ($subscore != 0) {
|
|
$matchedSubqueries++;
|
|
$score += $subscore;
|
|
}
|
|
}
|
|
|
|
return $score * $this->_coord[$matchedSubqueries] * $this->getBoost();
|
|
}
|
|
|
|
/**
|
|
* Execute query in context of index reader
|
|
* It also initializes necessary internal structures
|
|
*
|
|
* @param Zend_Search_Lucene_Interface $reader
|
|
* @param Zend_Search_Lucene_Index_DocsFilter|null $docsFilter
|
|
*/
|
|
public function execute(Zend_Search_Lucene_Interface $reader, $docsFilter = null)
|
|
{
|
|
// Initialize weight if it's not done yet
|
|
$this->_initWeight($reader);
|
|
|
|
if ($docsFilter === null) {
|
|
// Create local documents filter if it's not provided by upper query
|
|
include_once 'Zend/Search/Lucene/Index/DocsFilter.php';
|
|
$docsFilter = new Zend_Search_Lucene_Index_DocsFilter();
|
|
}
|
|
|
|
foreach ($this->_subqueries as $subqueryId => $subquery) {
|
|
if ($this->_signs == null || $this->_signs[$subqueryId] === true) {
|
|
// Subquery is required
|
|
$subquery->execute($reader, $docsFilter);
|
|
} else {
|
|
$subquery->execute($reader);
|
|
}
|
|
}
|
|
|
|
if ($this->_signs === null) {
|
|
$this->_calculateConjunctionResult();
|
|
} else {
|
|
$this->_calculateNonConjunctionResult();
|
|
}
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
* 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->_resVector;
|
|
}
|
|
|
|
/**
|
|
* Score specified document
|
|
*
|
|
* @param integer $docId
|
|
* @param Zend_Search_Lucene_Interface $reader
|
|
* @return float
|
|
*/
|
|
public function score($docId, Zend_Search_Lucene_Interface $reader)
|
|
{
|
|
if (isset($this->_resVector[$docId])) {
|
|
if ($this->_signs === null) {
|
|
return $this->_conjunctionScore($docId, $reader);
|
|
} else {
|
|
return $this->_nonConjunctionScore($docId, $reader);
|
|
}
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Return query terms
|
|
*
|
|
* @return array
|
|
*/
|
|
public function getQueryTerms()
|
|
{
|
|
$terms = array();
|
|
|
|
foreach ($this->_subqueries as $id => $subquery) {
|
|
if ($this->_signs === null || $this->_signs[$id] !== false) {
|
|
$terms = array_merge($terms, $subquery->getQueryTerms());
|
|
}
|
|
}
|
|
|
|
return $terms;
|
|
}
|
|
|
|
/**
|
|
* Query specific matches highlighting
|
|
*
|
|
* @param Zend_Search_Lucene_Search_Highlighter_Interface $highlighter Highlighter object (also contains doc for highlighting)
|
|
*/
|
|
protected function _highlightMatches(Zend_Search_Lucene_Search_Highlighter_Interface $highlighter)
|
|
{
|
|
foreach ($this->_subqueries as $id => $subquery) {
|
|
if ($this->_signs === null || $this->_signs[$id] !== false) {
|
|
$subquery->_highlightMatches($highlighter);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Print a query
|
|
*
|
|
* @return string
|
|
*/
|
|
public function __toString()
|
|
{
|
|
// It's used only for query visualisation, so we don't care about characters escaping
|
|
|
|
$query = '';
|
|
|
|
foreach ($this->_subqueries as $id => $subquery) {
|
|
if ($id != 0) {
|
|
$query .= ' ';
|
|
}
|
|
|
|
if ($this->_signs === null || $this->_signs[$id] === true) {
|
|
$query .= '+';
|
|
} else if ($this->_signs[$id] === false) {
|
|
$query .= '-';
|
|
}
|
|
|
|
$query .= '(' . $subquery->__toString() . ')';
|
|
}
|
|
|
|
if ($this->getBoost() != 1) {
|
|
$query = '(' . $query . ')^' . round($this->getBoost(), 4);
|
|
}
|
|
|
|
return $query;
|
|
}
|
|
}
|
|
|