mirror of
https://github.com/moodle/moodle.git
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1084 lines
30 KiB
PHP
1084 lines
30 KiB
PHP
<?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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* @copyright Copyright (c) 2005-2007 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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/** Zend_Search_Lucene_Exception */
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require_once $CFG->dirroot.'/search/Zend/Search/Lucene/Exception.php';
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/** Zend_Search_Lucene_Document */
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require_once $CFG->dirroot.'/search/Zend/Search/Lucene/Document.php';
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/** Zend_Search_Lucene_Document_Html */
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require_once $CFG->dirroot.'/search/Zend/Search/Lucene/Document/Html.php';
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/** Zend_Search_Lucene_Storage_Directory */
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require_once $CFG->dirroot.'/search/Zend/Search/Lucene/Storage/Directory/Filesystem.php';
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/** Zend_Search_Lucene_Storage_File_Memory */
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require_once $CFG->dirroot.'/search/Zend/Search/Lucene/Storage/File/Memory.php';
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/** Zend_Search_Lucene_Index_Term */
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require_once $CFG->dirroot.'/search/Zend/Search/Lucene/Index/Term.php';
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/** Zend_Search_Lucene_Index_TermInfo */
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require_once $CFG->dirroot.'/search/Zend/Search/Lucene/Index/TermInfo.php';
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/** Zend_Search_Lucene_Index_SegmentInfo */
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require_once $CFG->dirroot.'/search/Zend/Search/Lucene/Index/SegmentInfo.php';
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/** Zend_Search_Lucene_Index_FieldInfo */
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require_once $CFG->dirroot.'/search/Zend/Search/Lucene/Index/FieldInfo.php';
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/** Zend_Search_Lucene_Index_Writer */
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require_once $CFG->dirroot.'/search/Zend/Search/Lucene/Index/Writer.php';
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/** Zend_Search_Lucene_Search_QueryParser */
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require_once $CFG->dirroot.'/search/Zend/Search/Lucene/Search/QueryParser.php';
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/** Zend_Search_Lucene_Search_QueryHit */
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require_once $CFG->dirroot.'/search/Zend/Search/Lucene/Search/QueryHit.php';
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/** Zend_Search_Lucene_Search_Similarity */
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require_once $CFG->dirroot.'/search/Zend/Search/Lucene/Search/Similarity.php';
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/** Zend_Search_Lucene_Index_SegmentInfoPriorityQueue */
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require_once $CFG->dirroot.'/search/Zend/Search/Lucene/Index/SegmentInfoPriorityQueue.php';
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/** Zend_Search_Lucene_Interface */
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require_once $CFG->dirroot.'/search/Zend/Search/Lucene/Interface.php';
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/** Zend_Search_Lucene_Proxy */
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require_once $CFG->dirroot.'/search/Zend/Search/Lucene/Proxy.php';
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/**
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* @category Zend
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* @package Zend_Search_Lucene
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* @copyright Copyright (c) 2005-2007 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 implements Zend_Search_Lucene_Interface
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{
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/**
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* Default field name for search
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*
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* Null means search through all fields
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*
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* @var string
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*/
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private static $_defaultSearchField = null;
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/**
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* File system adapter.
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*
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* @var Zend_Search_Lucene_Storage_Directory
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*/
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private $_directory = null;
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/**
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* File system adapter closing option
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*
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* @var boolean
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*/
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private $_closeDirOnExit = true;
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/**
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* Writer for this index, not instantiated unless required.
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*
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* @var Zend_Search_Lucene_Index_Writer
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*/
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private $_writer = null;
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/**
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* Array of Zend_Search_Lucene_Index_SegmentInfo objects for this index.
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*
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* @var array Zend_Search_Lucene_Index_SegmentInfo
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*/
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private $_segmentInfos = array();
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/**
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* Number of documents in this index.
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*
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* @var integer
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*/
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private $_docCount = 0;
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/**
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* Flag for index changes
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*
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* @var boolean
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*/
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private $_hasChanges = false;
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/**
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* Index lock object
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*
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* @var Zend_Search_Lucene_Storage_File
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*/
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private $_lock;
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/**
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* Signal, that index is already closed, changes are fixed and resources are cleaned up
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*
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* @var boolean
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*/
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private $_closed = false;
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/**
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* Number of references to the index object
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*
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* @var integer
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*/
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private $_refCount = 0;
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/**
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* Create index
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*
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* @param mixed $directory
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* @return Zend_Search_Lucene_Interface
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*/
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public static function create($directory)
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{
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return new Zend_Search_Lucene_Proxy(new Zend_Search_Lucene($directory, true));
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}
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/**
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* Open index
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*
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* @param mixed $directory
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* @return Zend_Search_Lucene_Interface
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*/
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public static function open($directory)
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{
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return new Zend_Search_Lucene_Proxy(new Zend_Search_Lucene($directory, false));
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}
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/**
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* Opens the index.
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*
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* IndexReader constructor needs Directory as a parameter. It should be
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* a string with a path to the index folder or a Directory object.
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*
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* @param mixed $directory
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* @throws Zend_Search_Lucene_Exception
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*/
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public function __construct($directory = null, $create = false)
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{
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if ($directory === null) {
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throw new Zend_Search_Exception('No index directory specified');
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}
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if ($directory instanceof Zend_Search_Lucene_Storage_Directory_Filesystem) {
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$this->_directory = $directory;
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$this->_closeDirOnExit = false;
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} else {
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$this->_directory = new Zend_Search_Lucene_Storage_Directory_Filesystem($directory);
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$this->_closeDirOnExit = true;
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}
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// Get a shared lock to the index
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$this->_lock = $this->_directory->createFile('index.lock');
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$this->_segmentInfos = array();
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if ($create) {
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// Throw an exception if index is under processing now
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if (!$this->_lock->lock(LOCK_EX, true)) {
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throw new Zend_Search_Lucene_Exception('Can\'t create index. It\'s under processing now');
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}
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// Writer will create segments file for empty segments list
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$this->_writer = new Zend_Search_Lucene_Index_Writer($this->_directory, $this->_segmentInfos, true);
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if (!$this->_lock->lock(LOCK_SH)) {
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throw new Zend_Search_Lucene_Exception('Can\'t reduce lock level from Exclusive to Shared');
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}
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} else {
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// Wait if index is under switching from one set of segments to another (Index_Writer::_updateSegments())
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if (!$this->_lock->lock(LOCK_SH)) {
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throw new Zend_Search_Lucene_Exception('Can\'t obtain shared index lock');
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}
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$this->_writer = null;
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}
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$segmentsFile = $this->_directory->getFileObject('segments');
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$format = $segmentsFile->readInt();
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if ($format != (int)0xFFFFFFFF) {
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throw new Zend_Search_Lucene_Exception('Wrong segments file format');
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}
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// read version
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// $segmentsFile->readLong();
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$segmentsFile->readInt(); $segmentsFile->readInt();
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// read segment name counter
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$segmentsFile->readInt();
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$segments = $segmentsFile->readInt();
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$this->_docCount = 0;
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// read segmentInfos
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for ($count = 0; $count < $segments; $count++) {
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$segName = $segmentsFile->readString();
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$segSize = $segmentsFile->readInt();
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$this->_docCount += $segSize;
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$this->_segmentInfos[] =
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new Zend_Search_Lucene_Index_SegmentInfo($segName,
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$segSize,
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$this->_directory);
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}
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}
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/**
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* Close current index and free resources
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*/
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private function _close()
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{
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if ($this->_closed) {
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// index is already closed and resources are cleaned up
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return;
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}
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$this->commit();
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// Free shared lock
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$this->_lock->unlock();
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if ($this->_closeDirOnExit) {
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$this->_directory->close();
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}
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$this->_directory = null;
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$this->_writer = null;
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$this->_segmentInfos = null;
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$this->_closed = true;
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}
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/**
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* Add reference to the index object
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*
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* @internal
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*/
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public function addReference()
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{
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$this->_refCount++;
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}
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/**
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* Remove reference from the index object
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*
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* When reference count becomes zero, index is closed and resources are cleaned up
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*
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* @internal
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*/
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public function removeReference()
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{
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$this->_refCount--;
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if ($this->_refCount == 0) {
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$this->_close();
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}
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}
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/**
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* Object destructor
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*/
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public function __destruct()
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{
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$this->_close();
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}
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/**
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* Returns an instance of Zend_Search_Lucene_Index_Writer for the index
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*
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* @internal
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* @return Zend_Search_Lucene_Index_Writer
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*/
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public function getIndexWriter()
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{
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if (!$this->_writer instanceof Zend_Search_Lucene_Index_Writer) {
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$this->_writer = new Zend_Search_Lucene_Index_Writer($this->_directory, $this->_segmentInfos);
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}
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return $this->_writer;
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}
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/**
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* Returns the Zend_Search_Lucene_Storage_Directory instance for this index.
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*
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* @return Zend_Search_Lucene_Storage_Directory
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*/
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public function getDirectory()
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{
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return $this->_directory;
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}
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/**
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* Returns the total number of documents in this index (including deleted documents).
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*
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* @return integer
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*/
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public function count()
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{
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return $this->_docCount;
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}
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/**
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* Returns one greater than the largest possible document number.
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* This may be used to, e.g., determine how big to allocate a structure which will have
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* an element for every document number in an index.
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*
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* @return integer
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*/
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public function maxDoc()
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{
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return $this->count();
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}
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/**
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* Returns the total number of non-deleted documents in this index.
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*
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* @return integer
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*/
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public function numDocs()
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{
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$numDocs = 0;
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foreach ($this->_segmentInfos as $segmentInfo) {
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$numDocs += $segmentInfo->numDocs();
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}
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return $numDocs;
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}
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/**
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* Checks, that document is deleted
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*
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* @param integer $id
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* @return boolean
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* @throws Zend_Search_Lucene_Exception Exception is thrown if $id is out of the range
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*/
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public function isDeleted($id)
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{
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if ($id >= $this->_docCount) {
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throw new Zend_Search_Lucene_Exception('Document id is out of the range.');
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}
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$segmentStartId = 0;
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foreach ($this->_segmentInfos as $segmentInfo) {
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if ($segmentStartId + $segmentInfo->count() > $id) {
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break;
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}
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$segmentStartId += $segmentInfo->count();
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}
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return $segmentInfo->isDeleted($id - $segmentStartId);
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}
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/**
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* Set default search field.
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*
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* Null means, that search is performed through all fields by default
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*
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* Default value is null
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*
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* @param string $fieldName
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*/
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public static function setDefaultSearchField($fieldName)
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{
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self::$_defaultSearchField = $fieldName;
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}
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/**
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* Get default search field.
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*
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* Null means, that search is performed through all fields by default
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*
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* @return string
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*/
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public static function getDefaultSearchField()
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{
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return self::$_defaultSearchField;
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}
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/**
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* Retrieve index maxBufferedDocs option
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*
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* maxBufferedDocs is a minimal number of documents required before
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* the buffered in-memory documents are written into a new Segment
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*
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* Default value is 10
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*
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* @return integer
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*/
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public function getMaxBufferedDocs()
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{
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return $this->getIndexWriter()->maxBufferedDocs;
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}
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/**
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* Set index maxBufferedDocs option
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*
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* maxBufferedDocs is a minimal number of documents required before
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* the buffered in-memory documents are written into a new Segment
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*
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* Default value is 10
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*
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* @param integer $maxBufferedDocs
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*/
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public function setMaxBufferedDocs($maxBufferedDocs)
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{
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$this->getIndexWriter()->maxBufferedDocs = $maxBufferedDocs;
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}
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/**
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* Retrieve index maxMergeDocs option
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*
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* maxMergeDocs is a largest number of documents ever merged by addDocument().
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* Small values (e.g., less than 10,000) are best for interactive indexing,
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* as this limits the length of pauses while indexing to a few seconds.
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* Larger values are best for batched indexing and speedier searches.
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*
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* Default value is PHP_INT_MAX
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*
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* @return integer
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*/
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public function getMaxMergeDocs()
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{
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return $this->getIndexWriter()->maxMergeDocs;
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}
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/**
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* Set index maxMergeDocs option
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*
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* maxMergeDocs is a largest number of documents ever merged by addDocument().
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* Small values (e.g., less than 10,000) are best for interactive indexing,
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* as this limits the length of pauses while indexing to a few seconds.
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* Larger values are best for batched indexing and speedier searches.
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*
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* Default value is PHP_INT_MAX
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*
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* @param integer $maxMergeDocs
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*/
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public function setMaxMergeDocs($maxMergeDocs)
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{
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$this->getIndexWriter()->maxMergeDocs = $maxMergeDocs;
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}
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/**
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* Retrieve index mergeFactor option
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*
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* mergeFactor determines how often segment indices are merged by addDocument().
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* With smaller values, less RAM is used while indexing,
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* and searches on unoptimized indices are faster,
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* but indexing speed is slower.
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* With larger values, more RAM is used during indexing,
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* and while searches on unoptimized indices are slower,
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* indexing is faster.
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* Thus larger values (> 10) are best for batch index creation,
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* and smaller values (< 10) for indices that are interactively maintained.
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*
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* Default value is 10
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*
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* @return integer
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*/
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public function getMergeFactor()
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{
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return $this->getIndexWriter()->mergeFactor;
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}
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/**
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* Set index mergeFactor option
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*
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|
* mergeFactor determines how often segment indices are merged by addDocument().
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* With smaller values, less RAM is used while indexing,
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* and searches on unoptimized indices are faster,
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* but indexing speed is slower.
|
|
* With larger values, more RAM is used during indexing,
|
|
* and while searches on unoptimized indices are slower,
|
|
* indexing is faster.
|
|
* Thus larger values (> 10) are best for batch index creation,
|
|
* and smaller values (< 10) for indices that are interactively maintained.
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*
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* Default value is 10
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*
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* @param integer $maxMergeDocs
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*/
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public function setMergeFactor($mergeFactor)
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{
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$this->getIndexWriter()->mergeFactor = $mergeFactor;
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}
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/**
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* Performs a query against the index and returns an array
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* of Zend_Search_Lucene_Search_QueryHit objects.
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* Input is a string or Zend_Search_Lucene_Search_Query.
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*
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* @param mixed $query
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* @return array Zend_Search_Lucene_Search_QueryHit
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* @throws Zend_Search_Lucene_Exception
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*/
|
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public function find($query)
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{
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if (is_string($query)) {
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$query = Zend_Search_Lucene_Search_QueryParser::parse($query);
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}
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if (!$query instanceof Zend_Search_Lucene_Search_Query) {
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throw new Zend_Search_Lucene_Exception('Query must be a string or Zend_Search_Lucene_Search_Query object');
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}
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$this->commit();
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$hits = array();
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$scores = array();
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$ids = array();
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$query = $query->rewrite($this)->optimize($this);
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$query->execute($this);
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$topScore = 0;
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foreach ($query->matchedDocs() as $id => $num) {
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$docScore = $query->score($id, $this);
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if( $docScore != 0 ) {
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$hit = new Zend_Search_Lucene_Search_QueryHit($this);
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$hit->id = $id;
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$hit->score = $docScore;
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$hits[] = $hit;
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$ids[] = $id;
|
|
$scores[] = $docScore;
|
|
|
|
if ($docScore > $topScore) {
|
|
$topScore = $docScore;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (count($hits) == 0) {
|
|
// skip sorting, which may cause a error on empty index
|
|
return array();
|
|
}
|
|
|
|
if ($topScore > 1) {
|
|
foreach ($hits as $hit) {
|
|
$hit->score /= $topScore;
|
|
}
|
|
}
|
|
|
|
if (func_num_args() == 1) {
|
|
// sort by scores
|
|
array_multisort($scores, SORT_DESC, SORT_NUMERIC,
|
|
$ids, SORT_ASC, SORT_NUMERIC,
|
|
$hits);
|
|
} else {
|
|
// sort by given field names
|
|
|
|
$argList = func_get_args();
|
|
$fieldNames = $this->getFieldNames();
|
|
$sortArgs = array();
|
|
|
|
for ($count = 1; $count < count($argList); $count++) {
|
|
$fieldName = $argList[$count];
|
|
|
|
if (!is_string($fieldName)) {
|
|
throw new Zend_Search_Lucene_Exception('Field name must be a string.');
|
|
}
|
|
|
|
if (!in_array($fieldName, $fieldNames)) {
|
|
throw new Zend_Search_Lucene_Exception('Wrong field name.');
|
|
}
|
|
|
|
$valuesArray = array();
|
|
foreach ($hits as $hit) {
|
|
try {
|
|
$value = $hit->getDocument()->getFieldValue($fieldName);
|
|
} catch (Zend_Search_Lucene_Exception $e) {
|
|
if (strpos($e->getMessage(), 'not found') === false) {
|
|
throw $e;
|
|
} else {
|
|
$value = null;
|
|
}
|
|
}
|
|
|
|
$valuesArray[] = $value;
|
|
}
|
|
|
|
$sortArgs[] = $valuesArray;
|
|
|
|
if ($count + 1 < count($argList) && is_integer($argList[$count+1])) {
|
|
$count++;
|
|
$sortArgs[] = $argList[$count];
|
|
|
|
if ($count + 1 < count($argList) && is_integer($argList[$count+1])) {
|
|
$count++;
|
|
$sortArgs[] = $argList[$count];
|
|
} else {
|
|
if ($argList[$count] == SORT_ASC || $argList[$count] == SORT_DESC) {
|
|
$sortArgs[] = SORT_REGULAR;
|
|
} else {
|
|
$sortArgs[] = SORT_ASC;
|
|
}
|
|
}
|
|
} else {
|
|
$sortArgs[] = SORT_ASC;
|
|
$sortArgs[] = SORT_REGULAR;
|
|
}
|
|
}
|
|
|
|
// Sort by id's if values are equal
|
|
$sortArgs[] = $ids;
|
|
$sortArgs[] = SORT_ASC;
|
|
$sortArgs[] = SORT_NUMERIC;
|
|
|
|
// Array to be sorted
|
|
$sortArgs[] = &$hits;
|
|
|
|
// Do sort
|
|
call_user_func_array('array_multisort', $sortArgs);
|
|
}
|
|
|
|
return $hits;
|
|
}
|
|
|
|
|
|
/**
|
|
* Returns a list of all unique field names that exist in this index.
|
|
*
|
|
* @param boolean $indexed
|
|
* @return array
|
|
*/
|
|
public function getFieldNames($indexed = false)
|
|
{
|
|
$result = array();
|
|
foreach( $this->_segmentInfos as $segmentInfo ) {
|
|
$result = array_merge($result, $segmentInfo->getFields($indexed));
|
|
}
|
|
return $result;
|
|
}
|
|
|
|
|
|
/**
|
|
* Returns a Zend_Search_Lucene_Document object for the document
|
|
* number $id in this index.
|
|
*
|
|
* @param integer|Zend_Search_Lucene_Search_QueryHit $id
|
|
* @return Zend_Search_Lucene_Document
|
|
*/
|
|
public function getDocument($id)
|
|
{
|
|
if ($id instanceof Zend_Search_Lucene_Search_QueryHit) {
|
|
/* @var $id Zend_Search_Lucene_Search_QueryHit */
|
|
$id = $id->id;
|
|
}
|
|
|
|
if ($id >= $this->_docCount) {
|
|
throw new Zend_Search_Lucene_Exception('Document id is out of the range.');
|
|
}
|
|
|
|
$segmentStartId = 0;
|
|
foreach ($this->_segmentInfos as $segmentInfo) {
|
|
if ($segmentStartId + $segmentInfo->count() > $id) {
|
|
break;
|
|
}
|
|
|
|
$segmentStartId += $segmentInfo->count();
|
|
}
|
|
|
|
$fdxFile = $segmentInfo->openCompoundFile('.fdx');
|
|
$fdxFile->seek( ($id-$segmentStartId)*8, SEEK_CUR );
|
|
$fieldValuesPosition = $fdxFile->readLong();
|
|
|
|
$fdtFile = $segmentInfo->openCompoundFile('.fdt');
|
|
$fdtFile->seek($fieldValuesPosition, SEEK_CUR);
|
|
$fieldCount = $fdtFile->readVInt();
|
|
|
|
$doc = new Zend_Search_Lucene_Document();
|
|
for ($count = 0; $count < $fieldCount; $count++) {
|
|
$fieldNum = $fdtFile->readVInt();
|
|
$bits = $fdtFile->readByte();
|
|
|
|
$fieldInfo = $segmentInfo->getField($fieldNum);
|
|
|
|
if (!($bits & 2)) { // Text data
|
|
$field = new Zend_Search_Lucene_Field($fieldInfo->name,
|
|
$fdtFile->readString(),
|
|
'UTF-8',
|
|
true,
|
|
$fieldInfo->isIndexed,
|
|
$bits & 1 );
|
|
} else { // Binary data
|
|
$field = new Zend_Search_Lucene_Field($fieldInfo->name,
|
|
$fdtFile->readBinary(),
|
|
'',
|
|
true,
|
|
$fieldInfo->isIndexed,
|
|
$bits & 1,
|
|
true );
|
|
}
|
|
|
|
$doc->addField($field);
|
|
}
|
|
|
|
return $doc;
|
|
}
|
|
|
|
|
|
/**
|
|
* Returns true if index contain documents with specified term.
|
|
*
|
|
* Is used for query optimization.
|
|
*
|
|
* @param Zend_Search_Lucene_Index_Term $term
|
|
* @return boolean
|
|
*/
|
|
public function hasTerm(Zend_Search_Lucene_Index_Term $term)
|
|
{
|
|
foreach ($this->_segmentInfos as $segInfo) {
|
|
if ($segInfo->getTermInfo($term) instanceof Zend_Search_Lucene_Index_TermInfo) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Returns IDs of all the documents containing term.
|
|
*
|
|
* @param Zend_Search_Lucene_Index_Term $term
|
|
* @return array
|
|
*/
|
|
public function termDocs(Zend_Search_Lucene_Index_Term $term)
|
|
{
|
|
$result = array();
|
|
$segmentStartDocId = 0;
|
|
|
|
foreach ($this->_segmentInfos as $segInfo) {
|
|
$termInfo = $segInfo->getTermInfo($term);
|
|
|
|
if (!$termInfo instanceof Zend_Search_Lucene_Index_TermInfo) {
|
|
$segmentStartDocId += $segInfo->count();
|
|
continue;
|
|
}
|
|
|
|
$frqFile = $segInfo->openCompoundFile('.frq');
|
|
$frqFile->seek($termInfo->freqPointer,SEEK_CUR);
|
|
$docId = 0;
|
|
for( $count=0; $count < $termInfo->docFreq; $count++ ) {
|
|
$docDelta = $frqFile->readVInt();
|
|
if( $docDelta % 2 == 1 ) {
|
|
$docId += ($docDelta-1)/2;
|
|
} else {
|
|
$docId += $docDelta/2;
|
|
// read freq
|
|
$frqFile->readVInt();
|
|
}
|
|
|
|
$result[] = $segmentStartDocId + $docId;
|
|
}
|
|
|
|
$segmentStartDocId += $segInfo->count();
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
|
|
/**
|
|
* Returns an array of all term freqs.
|
|
* Result array structure: array(docId => freq, ...)
|
|
*
|
|
* @param Zend_Search_Lucene_Index_Term $term
|
|
* @return integer
|
|
*/
|
|
public function termFreqs(Zend_Search_Lucene_Index_Term $term)
|
|
{
|
|
$result = array();
|
|
$segmentStartDocId = 0;
|
|
foreach ($this->_segmentInfos as $segmentInfo) {
|
|
$result += $segmentInfo->termFreqs($term, $segmentStartDocId);
|
|
|
|
$segmentStartDocId += $segmentInfo->count();
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* Returns an array of all term positions in the documents.
|
|
* Result array structure: array(docId => array(pos1, pos2, ...), ...)
|
|
*
|
|
* @param Zend_Search_Lucene_Index_Term $term
|
|
* @return array
|
|
*/
|
|
public function termPositions(Zend_Search_Lucene_Index_Term $term)
|
|
{
|
|
$result = array();
|
|
$segmentStartDocId = 0;
|
|
foreach ($this->_segmentInfos as $segmentInfo) {
|
|
$result += $segmentInfo->termPositions($term, $segmentStartDocId);
|
|
|
|
$segmentStartDocId += $segmentInfo->count();
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
|
|
/**
|
|
* Returns the number of documents in this index containing the $term.
|
|
*
|
|
* @param Zend_Search_Lucene_Index_Term $term
|
|
* @return integer
|
|
*/
|
|
public function docFreq(Zend_Search_Lucene_Index_Term $term)
|
|
{
|
|
$result = 0;
|
|
foreach ($this->_segmentInfos as $segInfo) {
|
|
$termInfo = $segInfo->getTermInfo($term);
|
|
if ($termInfo !== null) {
|
|
$result += $termInfo->docFreq;
|
|
}
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
|
|
/**
|
|
* Retrive similarity used by index reader
|
|
*
|
|
* @return Zend_Search_Lucene_Search_Similarity
|
|
*/
|
|
public function getSimilarity()
|
|
{
|
|
return Zend_Search_Lucene_Search_Similarity::getDefault();
|
|
}
|
|
|
|
|
|
/**
|
|
* Returns a normalization factor for "field, document" pair.
|
|
*
|
|
* @param integer $id
|
|
* @param string $fieldName
|
|
* @return float
|
|
*/
|
|
public function norm($id, $fieldName)
|
|
{
|
|
if ($id >= $this->_docCount) {
|
|
return null;
|
|
}
|
|
|
|
$segmentStartId = 0;
|
|
foreach ($this->_segmentInfos as $segInfo) {
|
|
if ($segmentStartId + $segInfo->count() > $id) {
|
|
break;
|
|
}
|
|
|
|
$segmentStartId += $segInfo->count();
|
|
}
|
|
|
|
if ($segInfo->isDeleted($id - $segmentStartId)) {
|
|
return 0;
|
|
}
|
|
|
|
return $segInfo->norm($id - $segmentStartId, $fieldName);
|
|
}
|
|
|
|
/**
|
|
* Returns true if any documents have been deleted from this index.
|
|
*
|
|
* @return boolean
|
|
*/
|
|
public function hasDeletions()
|
|
{
|
|
foreach ($this->_segmentInfos as $segmentInfo) {
|
|
if ($segmentInfo->hasDeletions()) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
|
|
/**
|
|
* Deletes a document from the index.
|
|
* $id is an internal document id
|
|
*
|
|
* @param integer|Zend_Search_Lucene_Search_QueryHit $id
|
|
* @throws Zend_Search_Lucene_Exception
|
|
*/
|
|
public function delete($id)
|
|
{
|
|
if ($id instanceof Zend_Search_Lucene_Search_QueryHit) {
|
|
/* @var $id Zend_Search_Lucene_Search_QueryHit */
|
|
$id = $id->id;
|
|
}
|
|
|
|
if ($id >= $this->_docCount) {
|
|
throw new Zend_Search_Lucene_Exception('Document id is out of the range.');
|
|
}
|
|
|
|
$segmentStartId = 0;
|
|
foreach ($this->_segmentInfos as $segmentInfo) {
|
|
if ($segmentStartId + $segmentInfo->count() > $id) {
|
|
break;
|
|
}
|
|
|
|
$segmentStartId += $segmentInfo->count();
|
|
}
|
|
$segmentInfo->delete($id - $segmentStartId);
|
|
|
|
$this->_hasChanges = true;
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
* Adds a document to this index.
|
|
*
|
|
* @param Zend_Search_Lucene_Document $document
|
|
*/
|
|
public function addDocument(Zend_Search_Lucene_Document $document)
|
|
{
|
|
$this->getIndexWriter()->addDocument($document);
|
|
$this->_docCount++;
|
|
}
|
|
|
|
|
|
/**
|
|
* Update document counter
|
|
*/
|
|
private function _updateDocCount()
|
|
{
|
|
$this->_docCount = 0;
|
|
foreach ($this->_segmentInfos as $segInfo) {
|
|
$this->_docCount += $segInfo->count();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Commit changes resulting from delete() or undeleteAll() operations.
|
|
*
|
|
* @todo undeleteAll processing.
|
|
*/
|
|
public function commit()
|
|
{
|
|
if ($this->_hasChanges) {
|
|
foreach ($this->_segmentInfos as $segInfo) {
|
|
$segInfo->writeChanges();
|
|
}
|
|
|
|
$this->_hasChanges = false;
|
|
}
|
|
|
|
if ($this->_writer !== null) {
|
|
$this->_writer->commit();
|
|
|
|
$this->_updateDocCount();
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Optimize index.
|
|
*
|
|
* Merges all segments into one
|
|
*/
|
|
public function optimize()
|
|
{
|
|
// Commit changes if any changes have been made
|
|
$this->commit();
|
|
|
|
if (count($this->_segmentInfos) > 1 || $this->hasDeletions()) {
|
|
$this->getIndexWriter()->optimize();
|
|
$this->_updateDocCount();
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Returns an array of all terms in this index.
|
|
*
|
|
* @return array
|
|
*/
|
|
public function terms()
|
|
{
|
|
$result = array();
|
|
|
|
$segmentInfoQueue = new Zend_Search_Lucene_Index_SegmentInfoPriorityQueue();
|
|
|
|
foreach ($this->_segmentInfos as $segmentInfo) {
|
|
$segmentInfo->reset();
|
|
|
|
// Skip "empty" segments
|
|
if ($segmentInfo->currentTerm() !== null) {
|
|
$segmentInfoQueue->put($segmentInfo);
|
|
}
|
|
}
|
|
|
|
while (($segmentInfo = $segmentInfoQueue->pop()) !== null) {
|
|
if ($segmentInfoQueue->top() === null ||
|
|
$segmentInfoQueue->top()->currentTerm()->key() !=
|
|
$segmentInfo->currentTerm()->key()) {
|
|
// We got new term
|
|
$result[] = $segmentInfo->currentTerm();
|
|
}
|
|
|
|
$segmentInfo->nextTerm();
|
|
// check, if segment dictionary is finished
|
|
if ($segmentInfo->currentTerm() !== null) {
|
|
// Put segment back into the priority queue
|
|
$segmentInfoQueue->put($segmentInfo);
|
|
}
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
|
|
/*************************************************************************
|
|
@todo UNIMPLEMENTED
|
|
*************************************************************************/
|
|
/**
|
|
* Undeletes all documents currently marked as deleted in this index.
|
|
*
|
|
* @todo Implementation
|
|
*/
|
|
public function undeleteAll()
|
|
{}
|
|
}
|