CaptchaStore.php

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<?php
 
abstract class CaptchaStore {
    abstract public function store( $index, $info );
 
    abstract public function retrieve( $index );
 
    abstract public function clear( $index );
 
    abstract public function cookiesNeeded();
 
    private static $instance;
 
    final public static function get() {
        if ( !self::$instance instanceof self ) {
            global $wgCaptchaStorageClass;
            if ( in_array( 'CaptchaStore', class_parents( $wgCaptchaStorageClass ) ) ) {
                self::$instance = new $wgCaptchaStorageClass;
            } else {
                throw new Exception( "Invalid CaptchaStore class $wgCaptchaStorageClass" );
            }
        }
        return self::$instance;
    }
 
    final public static function unsetInstanceForTests() {
        if ( !defined( 'MW_PHPUNIT_TEST' ) ) {
            throw new MWException( 'Cannot unset ' . __CLASS__ . ' instance in operation.' );
        }
        self::$instance = null;
    }
 
    protected function __construct() {
    }
}