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<?php
/**
* @package Joomla.Platform
* @subpackage Language
*
* @copyright Copyright (C) 2005 - 2015 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE
*/
defined('JPATH_PLATFORM') or die;
/**
* Stemmer base class.
*
* @since 12.1
*/
abstract class JLanguageStemmer
{
/**
* An internal cache of stemmed tokens.
*
* @var array
* @since 12.1
*/
protected $cache = array();
/**
* @var array JLanguageStemmer instances.
* @since 12.1
*/
protected static $instances = array();
/**
* Method to get a stemmer, creating it if necessary.
*
* @param string $adapter The type of stemmer to load.
*
* @return JLanguageStemmer A JLanguageStemmer instance.
*
* @since 12.1
* @throws RuntimeException on invalid stemmer.
*/
public static function getInstance($adapter)
{
// Only create one stemmer for each adapter.
if (isset(self::$instances[$adapter]))
{
return self::$instances[$adapter];
}
// Setup the adapter for the stemmer.
$class = 'JLanguageStemmer' . ucfirst(trim($adapter));
// Check if a stemmer exists for the adapter.
if (!class_exists($class))
{
// Throw invalid adapter exception.
throw new RuntimeException(JText::sprintf('JLIB_STEMMER_INVALID_STEMMER', $adapter));
}
self::$instances[$adapter] = new $class;
return self::$instances[$adapter];
}
/**
* Method to stem a token and return the root.
*
* @param string $token The token to stem.
* @param string $lang The language of the token.
*
* @return string The root token.
*
* @since 12.1
*/
abstract public function stem($token, $lang);
}