79 lines
1.7 KiB
PHP
79 lines
1.7 KiB
PHP
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<?php
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/**
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* @package Joomla.Platform
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* @subpackage Language
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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('JPATH_PLATFORM') or die;
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/**
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* Stemmer base class.
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*
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* @package Joomla.Platform
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* @subpackage Language
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* @since 12.1
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*/
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abstract class JLanguageStemmer
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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 12.1
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*/
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protected $cache = array();
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/**
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* @var array JLanguageStemmer instances.
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* @since 12.1
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*/
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protected static $instances = 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 $adapter The type of stemmer to load.
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*
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* @return JLanguageStemmer A JLanguageStemmer instance.
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*
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* @since 12.1
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* @throws RuntimeException on invalid stemmer.
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*/
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public static function getInstance($adapter)
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{
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// Only create one stemmer for each adapter.
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if (isset(self::$instances[$adapter]))
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{
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return self::$instances[$adapter];
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}
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// Setup the adapter for the stemmer.
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$class = 'JLanguageStemmer' . ucfirst(trim($adapter));
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// Check if a stemmer exists for the adapter.
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if (!class_exists($class))
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{
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// Throw invalid adapter exception.
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throw new RuntimeException(JText::sprintf('JLIB_STEMMER_INVALID_STEMMER', $adapter));
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}
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self::$instances[$adapter] = new $class;
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return self::$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 $lang The language of the token.
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*
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* @return string The root token.
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*
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* @since 12.1
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*/
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abstract public function stem($token, $lang);
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}
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