ConfigFactory.php

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<?php

class ConfigFactory {

    protected $factoryFunctions = array();

    protected $configs = array();

    public static function getDefaultInstance() {
        static $self = null;
        if ( !$self ) {
            $self = new self;
            global $wgConfigRegistry;
            foreach ( $wgConfigRegistry as $name => $callback ) {
                $self->register( $name, $callback );
            }
        }
        return $self;
    }

    public function register( $name, $callback ) {
        if ( !is_callable( $callback ) ) {
            throw new InvalidArgumentException( 'Invalid callback provided' );
        }
        $this->factoryFunctions[$name] = $callback;
    }

    public function makeConfig( $name ) {
        if ( !isset( $this->configs[$name] ) ) {
            if ( !isset( $this->factoryFunctions[$name] ) ) {
                throw new ConfigException( "No registered builder available for $name." );
            }
            $conf = call_user_func( $this->factoryFunctions[$name], $this );
            if ( $conf instanceof Config ) {
                $this->configs[$name] = $conf;
            } else {
                throw new UnexpectedValueException( "The builder for $name returned a non-Config object." );
            }
        }

        return $this->configs[$name];
    }
}