public static function loadContextFromFile(string $filePath): ContextInterface
    {
        if(!file_exists($filePath)){
            throw new Exception\FileNotFoundException('Context file not found: '.$filePath, 404, null, $filePath);
        }

        $contents = file_get_contents($filePath);
        $context_array = json_decode($contents, true);

        if($context_array === null){
            throw new Exception\MalformedJsonException('JSON sintax error.');
        }

        return new self($context_array);
    }