/lib/Zend/Search/Lucene/MultiSearcher.php
PHP | 973 lines | 883 code | 11 blank | 79 comment | 2 complexity | 7bf7b4bc5bdd2783230386d9774de47f MD5 | raw file
- <?php
- /**
- * Zend Framework
- *
- * LICENSE
- *
- * This source file is subject to the new BSD license that is bundled
- * with this package in the file LICENSE.txt.
- * It is also available through the world-wide-web at this URL:
- * http://framework.zend.com/license/new-bsd
- * If you did not receive a copy of the license and are unable to
- * obtain it through the world-wide-web, please send an email
- * to license@zend.com so we can send you a copy immediately.
- *
- * @category Zend
- * @package Zend_Search_Lucene
- * @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
- * @license http://framework.zend.com/license/new-bsd New BSD License
- * @version $Id: MultiSearcher.php 22967 2010-09-18 18:53:58Z ramon $
- */
- /** Zend_Search_Lucene_Interface */
- #require_once 'Zend/Search/Lucene/Interface.php';
- /**
- * Multisearcher allows to search through several independent indexes.
- *
- * @category Zend
- * @package Zend_Search_Lucene
- * @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
- * @license http://framework.zend.com/license/new-bsd New BSD License
- */
- class Zend_Search_Lucene_Interface_MultiSearcher implements Zend_Search_Lucene_Interface
- {
- /**
- * List of indices for searching.
- * Array of Zend_Search_Lucene_Interface objects
- *
- * @var array
- */
- protected $_indices;
- /**
- * Object constructor.
- *
- * @param array $indices Arrays of indices for search
- * @throws Zend_Search_Lucene_Exception
- */
- public function __construct($indices = array())
- {
- $this->_indices = $indices;
- foreach ($this->_indices as $index) {
- if (!$index instanceof Zend_Search_Lucene_Interface) {
- #require_once 'Zend/Search/Lucene/Exception.php';
- throw new Zend_Search_Lucene_Exception('sub-index objects have to implement Zend_Search_Lucene_Interface.');
- }
- }
- }
- /**
- * Add index for searching.
- *
- * @param Zend_Search_Lucene_Interface $index
- */
- public function addIndex(Zend_Search_Lucene_Interface $index)
- {
- $this->_indices[] = $index;
- }
- /**
- * Get current generation number
- *
- * Returns generation number
- * 0 means pre-2.1 index format
- * -1 means there are no segments files.
- *
- * @param Zend_Search_Lucene_Storage_Directory $directory
- * @return integer
- * @throws Zend_Search_Lucene_Exception
- */
- public static function getActualGeneration(Zend_Search_Lucene_Storage_Directory $directory)
- {
- #require_once 'Zend/Search/Lucene/Exception.php';
- throw new Zend_Search_Lucene_Exception("Generation number can't be retrieved for multi-searcher");
- }
- /**
- * Get segments file name
- *
- * @param integer $generation
- * @return string
- */
- public static function getSegmentFileName($generation)
- {
- return Zend_Search_Lucene::getSegmentFileName($generation);
- }
- /**
- * Get index format version
- *
- * @return integer
- * @throws Zend_Search_Lucene_Exception
- */
- public function getFormatVersion()
- {
- #require_once 'Zend/Search/Lucene/Exception.php';
- throw new Zend_Search_Lucene_Exception("Format version can't be retrieved for multi-searcher");
- }
- /**
- * Set index format version.
- * Index is converted to this format at the nearest upfdate time
- *
- * @param int $formatVersion
- */
- public function setFormatVersion($formatVersion)
- {
- foreach ($this->_indices as $index) {
- $index->setFormatVersion($formatVersion);
- }
- }
- /**
- * Returns the Zend_Search_Lucene_Storage_Directory instance for this index.
- *
- * @return Zend_Search_Lucene_Storage_Directory
- */
- public function getDirectory()
- {
- #require_once 'Zend/Search/Lucene/Exception.php';
- throw new Zend_Search_Lucene_Exception("Index directory can't be retrieved for multi-searcher");
- }
- /**
- * Returns the total number of documents in this index (including deleted documents).
- *
- * @return integer
- */
- public function count()
- {
- $count = 0;
- foreach ($this->_indices as $index) {
- $count += $index->count();
- }
- return $count;
- }
- /**
- * Returns one greater than the largest possible document number.
- * This may be used to, e.g., determine how big to allocate a structure which will have
- * an element for every document number in an index.
- *
- * @return integer
- */
- public function maxDoc()
- {
- return $this->count();
- }
- /**
- * Returns the total number of non-deleted documents in this index.
- *
- * @return integer
- */
- public function numDocs()
- {
- $docs = 0;
- foreach ($this->_indices as $index) {
- $docs += $index->numDocs();
- }
- return $docs;
- }
- /**
- * Checks, that document is deleted
- *
- * @param integer $id
- * @return boolean
- * @throws Zend_Search_Lucene_Exception Exception is thrown if $id is out of the range
- */
- public function isDeleted($id)
- {
- foreach ($this->_indices as $index) {
- $indexCount = $index->count();
- if ($indexCount > $id) {
- return $index->isDeleted($id);
- }
- $id -= $indexCount;
- }
- #require_once 'Zend/Search/Lucene/Exception.php';
- throw new Zend_Search_Lucene_Exception('Document id is out of the range.');
- }
- /**
- * Set default search field.
- *
- * Null means, that search is performed through all fields by default
- *
- * Default value is null
- *
- * @param string $fieldName
- */
- public static function setDefaultSearchField($fieldName)
- {
- foreach ($this->_indices as $index) {
- $index->setDefaultSearchField($fieldName);
- }
- }
- /**
- * Get default search field.
- *
- * Null means, that search is performed through all fields by default
- *
- * @return string
- * @throws Zend_Search_Lucene_Exception
- */
- public static function getDefaultSearchField()
- {
- if (count($this->_indices) == 0) {
- #require_once 'Zend/Search/Lucene/Exception.php';
- throw new Zend_Search_Lucene_Exception('Indices list is empty');
- }
- $defaultSearchField = reset($this->_indices)->getDefaultSearchField();
- foreach ($this->_indices as $index) {
- if ($index->getDefaultSearchField() !== $defaultSearchField) {
- #require_once 'Zend/Search/Lucene/Exception.php';
- throw new Zend_Search_Lucene_Exception('Indices have different default search field.');
- }
- }
- return $defaultSearchField;
- }
- /**
- * Set result set limit.
- *
- * 0 (default) means no limit
- *
- * @param integer $limit
- */
- public static function setResultSetLimit($limit)
- {
- foreach ($this->_indices as $index) {
- $index->setResultSetLimit($limit);
- }
- }
- /**
- * Set result set limit.
- *
- * 0 means no limit
- *
- * @return integer
- * @throws Zend_Search_Lucene_Exception
- */
- public static function getResultSetLimit()
- {
- if (count($this->_indices) == 0) {
- #require_once 'Zend/Search/Lucene/Exception.php';
- throw new Zend_Search_Lucene_Exception('Indices list is empty');
- }
- $defaultResultSetLimit = reset($this->_indices)->getResultSetLimit();
- foreach ($this->_indices as $index) {
- if ($index->getResultSetLimit() !== $defaultResultSetLimit) {
- #require_once 'Zend/Search/Lucene/Exception.php';
- throw new Zend_Search_Lucene_Exception('Indices have different default search field.');
- }
- }
- return $defaultResultSetLimit;
- }
- /**
- * Retrieve index maxBufferedDocs option
- *
- * maxBufferedDocs is a minimal number of documents required before
- * the buffered in-memory documents are written into a new Segment
- *
- * Default value is 10
- *
- * @return integer
- * @throws Zend_Search_Lucene_Exception
- */
- public function getMaxBufferedDocs()
- {
- if (count($this->_indices) == 0) {
- #require_once 'Zend/Search/Lucene/Exception.php';
- throw new Zend_Search_Lucene_Exception('Indices list is empty');
- }
- $maxBufferedDocs = reset($this->_indices)->getMaxBufferedDocs();
- foreach ($this->_indices as $index) {
- if ($index->getMaxBufferedDocs() !== $maxBufferedDocs) {
- #require_once 'Zend/Search/Lucene/Exception.php';
- throw new Zend_Search_Lucene_Exception('Indices have different default search field.');
- }
- }
- return $maxBufferedDocs;
- }
- /**
- * Set index maxBufferedDocs option
- *
- * maxBufferedDocs is a minimal number of documents required before
- * the buffered in-memory documents are written into a new Segment
- *
- * Default value is 10
- *
- * @param integer $maxBufferedDocs
- */
- public function setMaxBufferedDocs($maxBufferedDocs)
- {
- foreach ($this->_indices as $index) {
- $index->setMaxBufferedDocs($maxBufferedDocs);
- }
- }
- /**
- * Retrieve index maxMergeDocs option
- *
- * maxMergeDocs is a largest number of documents ever merged by addDocument().
- * Small values (e.g., less than 10,000) are best for interactive indexing,
- * as this limits the length of pauses while indexing to a few seconds.
- * Larger values are best for batched indexing and speedier searches.
- *
- * Default value is PHP_INT_MAX
- *
- * @return integer
- * @throws Zend_Search_Lucene_Exception
- */
- public function getMaxMergeDocs()
- {
- if (count($this->_indices) == 0) {
- #require_once 'Zend/Search/Lucene/Exception.php';
- throw new Zend_Search_Lucene_Exception('Indices list is empty');
- }
- $maxMergeDocs = reset($this->_indices)->getMaxMergeDocs();
- foreach ($this->_indices as $index) {
- if ($index->getMaxMergeDocs() !== $maxMergeDocs) {
- #require_once 'Zend/Search/Lucene/Exception.php';
- throw new Zend_Search_Lucene_Exception('Indices have different default search field.');
- }
- }
- return $maxMergeDocs;
- }
- /**
- * Set index maxMergeDocs option
- *
- * maxMergeDocs is a largest number of documents ever merged by addDocument().
- * Small values (e.g., less than 10,000) are best for interactive indexing,
- * as this limits the length of pauses while indexing to a few seconds.
- * Larger values are best for batched indexing and speedier searches.
- *
- * Default value is PHP_INT_MAX
- *
- * @param integer $maxMergeDocs
- */
- public function setMaxMergeDocs($maxMergeDocs)
- {
- foreach ($this->_indices as $index) {
- $index->setMaxMergeDocs($maxMergeDocs);
- }
- }
- /**
- * Retrieve index mergeFactor option
- *
- * mergeFactor determines how often segment indices are merged by addDocument().
- * With smaller values, less RAM is used while indexing,
- * and searches on unoptimized indices are faster,
- * 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.
- *
- * Default value is 10
- *
- * @return integer
- * @throws Zend_Search_Lucene_Exception
- */
- public function getMergeFactor()
- {
- if (count($this->_indices) == 0) {
- #require_once 'Zend/Search/Lucene/Exception.php';
- throw new Zend_Search_Lucene_Exception('Indices list is empty');
- }
- $mergeFactor = reset($this->_indices)->getMergeFactor();
- foreach ($this->_indices as $index) {
- if ($index->getMergeFactor() !== $mergeFactor) {
- #require_once 'Zend/Search/Lucene/Exception.php';
- throw new Zend_Search_Lucene_Exception('Indices have different default search field.');
- }
- }
- return $mergeFactor;
- }
- /**
- * Set index mergeFactor option
- *
- * mergeFactor determines how often segment indices are merged by addDocument().
- * With smaller values, less RAM is used while indexing,
- * and searches on unoptimized indices are faster,
- * 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.
- *
- * Default value is 10
- *
- * @param integer $maxMergeDocs
- */
- public function setMergeFactor($mergeFactor)
- {
- foreach ($this->_indices as $index) {
- $index->setMaxMergeDocs($mergeFactor);
- }
- }
- /**
- * Performs a query against the index and returns an array
- * of Zend_Search_Lucene_Search_QueryHit objects.
- * Input is a string or Zend_Search_Lucene_Search_Query.
- *
- * @param mixed $query
- * @return array Zend_Search_Lucene_Search_QueryHit
- * @throws Zend_Search_Lucene_Exception
- */
- public function find($query)
- {
- if (count($this->_indices) == 0) {
- return array();
- }
- $hitsList = array();
- $indexShift = 0;
- foreach ($this->_indices as $index) {
- $hits = $index->find($query);
- if ($indexShift != 0) {
- foreach ($hits as $hit) {
- $hit->id += $indexShift;
- }
- }
- $indexShift += $index->count();
- $hitsList[] = $hits;
- }
- /** @todo Implement advanced sorting */
- return call_user_func_array('array_merge', $hitsList);
- }
- /**
- * Returns a list of all unique field names that exist in this index.
- *
- * @param boolean $indexed
- * @return array
- */
- public function getFieldNames($indexed = false)
- {
- $fieldNamesList = array();
- foreach ($this->_indices as $index) {
- $fieldNamesList[] = $index->getFieldNames($indexed);
- }
- return array_unique(call_user_func_array('array_merge', $fieldNamesList));
- }
- /**
- * 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
- * @throws Zend_Search_Lucene_Exception Exception is thrown if $id is out of the range
- */
- public function getDocument($id)
- {
- if ($id instanceof Zend_Search_Lucene_Search_QueryHit) {
- /* @var $id Zend_Search_Lucene_Search_QueryHit */
- $id = $id->id;
- }
- foreach ($this->_indices as $index) {
- $indexCount = $index->count();
- if ($indexCount > $id) {
- return $index->getDocument($id);
- }
- $id -= $indexCount;
- }
- #require_once 'Zend/Search/Lucene/Exception.php';
- throw new Zend_Search_Lucene_Exception('Document id is out of the range.');
- }
- /**
- * 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->_indices as $index) {
- if ($index->hasTerm($term)) {
- return true;
- }
- }
- return false;
- }
- /**
- * Returns IDs of all the documents containing term.
- *
- * @param Zend_Search_Lucene_Index_Term $term
- * @param Zend_Search_Lucene_Index_DocsFilter|null $docsFilter
- * @return array
- * @throws Zend_Search_Lucene_Exception
- */
- public function termDocs(Zend_Search_Lucene_Index_Term $term, $docsFilter = null)
- {
- if ($docsFilter != null) {
- #require_once 'Zend/Search/Lucene/Exception.php';
- throw new Zend_Search_Lucene_Exception('Document filters could not used with multi-searcher');
- }
- $docsList = array();
- $indexShift = 0;
- foreach ($this->_indices as $index) {
- $docs = $index->termDocs($term);
- if ($indexShift != 0) {
- foreach ($docs as $id => $docId) {
- $docs[$id] += $indexShift;
- }
- }
- $indexShift += $index->count();
- $docsList[] = $docs;
- }
- return call_user_func_array('array_merge', $docsList);
- }
- /**
- * Returns documents filter for all documents containing term.
- *
- * It performs the same operation as termDocs, but return result as
- * Zend_Search_Lucene_Index_DocsFilter object
- *
- * @param Zend_Search_Lucene_Index_Term $term
- * @param Zend_Search_Lucene_Index_DocsFilter|null $docsFilter
- * @return Zend_Search_Lucene_Index_DocsFilter
- * @throws Zend_Search_Lucene_Exception
- */
- public function termDocsFilter(Zend_Search_Lucene_Index_Term $term, $docsFilter = null)
- {
- #require_once 'Zend/Search/Lucene/Exception.php';
- throw new Zend_Search_Lucene_Exception('Document filters could not used with multi-searcher');
- }
- /**
- * Returns an array of all term freqs.
- * Return array structure: array( docId => freq, ...)
- *
- * @param Zend_Search_Lucene_Index_Term $term
- * @param Zend_Search_Lucene_Index_DocsFilter|null $docsFilter
- * @return integer
- * @throws Zend_Search_Lucene_Exception
- */
- public function termFreqs(Zend_Search_Lucene_Index_Term $term, $docsFilter = null)
- {
- if ($docsFilter != null) {
- #require_once 'Zend/Search/Lucene/Exception.php';
- throw new Zend_Search_Lucene_Exception('Document filters could not used with multi-searcher');
- }
- $freqsList = array();
- $indexShift = 0;
- foreach ($this->_indices as $index) {
- $freqs = $index->termFreqs($term);
- if ($indexShift != 0) {
- $freqsShifted = array();
- foreach ($freqs as $docId => $freq) {
- $freqsShifted[$docId + $indexShift] = $freq;
- }
- $freqs = $freqsShifted;
- }
- $indexShift += $index->count();
- $freqsList[] = $freqs;
- }
- return call_user_func_array('array_merge', $freqsList);
- }
- /**
- * Returns an array of all term positions in the documents.
- * Return array structure: array( docId => array( pos1, pos2, ...), ...)
- *
- * @param Zend_Search_Lucene_Index_Term $term
- * @param Zend_Search_Lucene_Index_DocsFilter|null $docsFilter
- * @return array
- * @throws Zend_Search_Lucene_Exception
- */
- public function termPositions(Zend_Search_Lucene_Index_Term $term, $docsFilter = null)
- {
- if ($docsFilter != null) {
- #require_once 'Zend/Search/Lucene/Exception.php';
- throw new Zend_Search_Lucene_Exception('Document filters could not used with multi-searcher');
- }
- $termPositionsList = array();
- $indexShift = 0;
- foreach ($this->_indices as $index) {
- $termPositions = $index->termPositions($term);
- if ($indexShift != 0) {
- $termPositionsShifted = array();
- foreach ($termPositions as $docId => $positions) {
- $termPositions[$docId + $indexShift] = $positions;
- }
- $termPositions = $termPositionsShifted;
- }
- $indexShift += $index->count();
- $termPositionsList[] = $termPositions;
- }
- return call_user_func_array('array_merge', $termPositions);
- }
- /**
- * 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)
- {
- $docFreq = 0;
- foreach ($this->_indices as $index) {
- $docFreq += $index->docFreq($term);
- }
- return $docFreq;
- }
- /**
- * Retrive similarity used by index reader
- *
- * @return Zend_Search_Lucene_Search_Similarity
- * @throws Zend_Search_Lucene_Exception
- */
- public function getSimilarity()
- {
- if (count($this->_indices) == 0) {
- #require_once 'Zend/Search/Lucene/Exception.php';
- throw new Zend_Search_Lucene_Exception('Indices list is empty');
- }
- $similarity = reset($this->_indices)->getSimilarity();
- foreach ($this->_indices as $index) {
- if ($index->getSimilarity() !== $similarity) {
- #require_once 'Zend/Search/Lucene/Exception.php';
- throw new Zend_Search_Lucene_Exception('Indices have different similarity.');
- }
- }
- return $similarity;
- }
- /**
- * Returns a normalization factor for "field, document" pair.
- *
- * @param integer $id
- * @param string $fieldName
- * @return float
- */
- public function norm($id, $fieldName)
- {
- foreach ($this->_indices as $index) {
- $indexCount = $index->count();
- if ($indexCount > $id) {
- return $index->norm($id, $fieldName);
- }
- $id -= $indexCount;
- }
- return null;
- }
- /**
- * Returns true if any documents have been deleted from this index.
- *
- * @return boolean
- */
- public function hasDeletions()
- {
- foreach ($this->_indices as $index) {
- if ($index->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)
- {
- foreach ($this->_indices as $index) {
- $indexCount = $index->count();
- if ($indexCount > $id) {
- $index->delete($id);
- return;
- }
- $id -= $indexCount;
- }
- #require_once 'Zend/Search/Lucene/Exception.php';
- throw new Zend_Search_Lucene_Exception('Document id is out of the range.');
- }
- /**
- * Callback used to choose target index for new documents
- *
- * Function/method signature:
- * Zend_Search_Lucene_Interface callbackFunction(Zend_Search_Lucene_Document $document, array $indices);
- *
- * null means "default documents distributing algorithm"
- *
- * @var callback
- */
- protected $_documentDistributorCallBack = null;
- /**
- * Set callback for choosing target index.
- *
- * @param callback $callback
- * @throws Zend_Search_Lucene_Exception
- */
- public function setDocumentDistributorCallback($callback)
- {
- if ($callback !== null && !is_callable($callback)) {
- #require_once 'Zend/Search/Lucene/Exception.php';
- throw new Zend_Search_Lucene_Exception('$callback parameter must be a valid callback.');
- }
- $this->_documentDistributorCallBack = $callback;
- }
- /**
- * Get callback for choosing target index.
- *
- * @return callback
- */
- public function getDocumentDistributorCallback()
- {
- return $this->_documentDistributorCallBack;
- }
- /**
- * Adds a document to this index.
- *
- * @param Zend_Search_Lucene_Document $document
- * @throws Zend_Search_Lucene_Exception
- */
- public function addDocument(Zend_Search_Lucene_Document $document)
- {
- if ($this->_documentDistributorCallBack !== null) {
- $index = call_user_func($this->_documentDistributorCallBack, $document, $this->_indices);
- } else {
- $index = $this->_indices[array_rand($this->_indices)];
- }
- $index->addDocument($document);
- }
- /**
- * Commit changes resulting from delete() or undeleteAll() operations.
- */
- public function commit()
- {
- foreach ($this->_indices as $index) {
- $index->commit();
- }
- }
- /**
- * Optimize index.
- *
- * Merges all segments into one
- */
- public function optimize()
- {
- foreach ($this->_indices as $index) {
- $index->optimise();
- }
- }
- /**
- * Returns an array of all terms in this index.
- *
- * @return array
- */
- public function terms()
- {
- $termsList = array();
- foreach ($this->_indices as $index) {
- $termsList[] = $index->terms();
- }
- return array_unique(call_user_func_array('array_merge', $termsList));
- }
- /**
- * Terms stream priority queue object
- *
- * @var Zend_Search_Lucene_TermStreamsPriorityQueue
- */
- private $_termsStream = null;
- /**
- * Reset terms stream.
- */
- public function resetTermsStream()
- {
- if ($this->_termsStream === null) {
- /** Zend_Search_Lucene_TermStreamsPriorityQueue */
- #require_once 'Zend/Search/Lucene/TermStreamsPriorityQueue.php';
- $this->_termsStream = new Zend_Search_Lucene_TermStreamsPriorityQueue($this->_indices);
- } else {
- $this->_termsStream->resetTermsStream();
- }
- }
- /**
- * Skip terms stream up to specified term preffix.
- *
- * Prefix contains fully specified field info and portion of searched term
- *
- * @param Zend_Search_Lucene_Index_Term $prefix
- */
- public function skipTo(Zend_Search_Lucene_Index_Term $prefix)
- {
- $this->_termsStream->skipTo($prefix);
- }
- /**
- * Scans terms dictionary and returns next term
- *
- * @return Zend_Search_Lucene_Index_Term|null
- */
- public function nextTerm()
- {
- return $this->_termsStream->nextTerm();
- }
- /**
- * Returns term in current position
- *
- * @return Zend_Search_Lucene_Index_Term|null
- */
- public function currentTerm()
- {
- return $this->_termsStream->currentTerm();
- }
- /**
- * Close terms stream
- *
- * Should be used for resources clean up if stream is not read up to the end
- */
- public function closeTermsStream()
- {
- $this->_termsStream->closeTermsStream();
- $this->_termsStream = null;
- }
- /**
- * Undeletes all documents currently marked as deleted in this index.
- */
- public function undeleteAll()
- {
- foreach ($this->_indices as $index) {
- $index->undeleteAll();
- }
- }
- /**
- * Add reference to the index object
- *
- * @internal
- */
- public function addReference()
- {
- // Do nothing, since it's never referenced by indices
- }
- /**
- * Remove reference from the index object
- *
- * When reference count becomes zero, index is closed and resources are cleaned up
- *
- * @internal
- */
- public function removeReference()
- {
- // Do nothing, since it's never referenced by indices
- }
- }