Collation.php

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<?php
use MediaWiki\MediaWikiServices;
 
abstract class Collation {
    private static $instance;
 
    public static function singleton() {
        if ( !self::$instance ) {
            global $wgCategoryCollation;
            self::$instance = self::factory( $wgCategoryCollation );
        }
        return self::$instance;
    }
 
    public static function factory( $collationName ) {
        return MediaWikiServices::getInstance()->getCollationFactory()->makeCollation( $collationName );
    }
 
    abstract public function getSortKey( $string );
 
    abstract public function getFirstLetter( $string );
 
}