static public function findRecursive( $sourceDir, array $includeFilters = array(), array $excludeFilters = array(), &$statistics = null )
    {
        // init statistics array
        if ( !is_array( $statistics ) || !array_key_exists( 'size', $statistics ) || !array_key_exists( 'count', $statistics ) )
        {
            $statistics['size']  = 0;
            $statistics['count'] = 0;
        }

        // create the context, and then start walking over the array
        $context = new ezcBaseFileFindContext;
        self::walkRecursive( $sourceDir, $includeFilters, $excludeFilters, array( 'ezcBaseFile', 'findRecursiveCallback' ), $context );

        // collect the statistics
        $statistics['size'] = $context->size;
        $statistics['count'] = $context->count;

        // return the found and pattern-matched files
        sort( $context->elements );
        return $context->elements;
    }