tonic: protected responseMessage use case

index.php

<?php

//...

require_once 'NotFoundResponse.php';

try {
    $response = $resource->exec();
} catch (\Tonic\NotFoundException $e) {
    $response = new NotFoundResponse;
}

//...

NotFoundResponse.php

<?php

class NotFoundResponse extends Tonic\Response
{

	public function __construct($code = Tonic\Response::NOTFOUND, $message = '')
	{
		$this->code = $code;

		$this->body = ['code' => $code, 'message' => ($message ?: $this->responseMessage()) ];
		$this->body = json_encode($this->body);

		$this->contentType = 'application/json';
	}

	// ..
}