88 lines
1.9 KiB
PHP
88 lines
1.9 KiB
PHP
<?php
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/**
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* @package Joomla.Administrator
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* @subpackage com_finder
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*
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* @copyright Copyright (C) 2005 - 2013 Open Source Matters, Inc. All rights reserved.
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* @license GNU General Public License version 2 or later; see LICENSE
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*/
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defined('_JEXEC') or die;
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/**
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* Stemmer base class for the Finder indexer package.
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*
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* @package Joomla.Administrator
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* @subpackage com_finder
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* @since 2.5
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*/
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abstract class FinderIndexerStemmer
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{
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/**
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* An internal cache of stemmed tokens.
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*
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* @var array
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* @since 2.5
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*/
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public $cache = array();
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/**
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* Method to get a stemmer, creating it if necessary.
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*
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* @param string $adapter The type of stemmer to load.
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*
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* @return FinderIndexerStemmer A FinderIndexerStemmer instance.
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*
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* @since 2.5
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* @throws Exception on invalid stemmer.
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*/
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public static function getInstance($adapter)
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{
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static $instances;
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// Only create one stemmer for each adapter.
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if (isset($instances[$adapter]))
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{
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return $instances[$adapter];
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}
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// Create an array of instances if necessary.
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if (!is_array($instances))
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{
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$instances = array();
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}
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// Setup the adapter for the stemmer.
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$adapter = JFilterInput::getInstance()->clean($adapter, 'cmd');
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$path = __DIR__ . '/stemmer/' . $adapter . '.php';
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$class = 'FinderIndexerStemmer' . ucfirst($adapter);
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// Check if a stemmer exists for the adapter.
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if (file_exists($path))
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{
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// Instantiate the stemmer.
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include_once $path;
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$instances[$adapter] = new $class;
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}
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else
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{
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// Throw invalid adapter exception.
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throw new Exception(JText::sprintf('COM_FINDER_INDEXER_INVALID_STEMMER', $adapter));
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}
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return $instances[$adapter];
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}
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/**
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* Method to stem a token and return the root.
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*
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* @param string $token The token to stem.
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* @param string $lang The language of the token.
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*
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* @return string The root token.
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*
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* @since 2.5
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*/
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abstract public function stem($token, $lang);
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}
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