Classes List

Symfony\Component\HttpKernel\Fragment\FragmentHandler

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<?php

/* * This file is part of the Symfony package. * * (c) Fabien Potencier <fabien@symfony.com> * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */


namespace Symfony\Component\HttpKernel\Fragment;

use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpFoundation\StreamedResponse;
use Symfony\Component\HttpFoundation\RequestStack;
use Symfony\Component\HttpKernel\Controller\ControllerReference;

/** * Renders a URI that represents a resource fragment. * * This class handles the rendering of resource fragments that are included into * a main resource. The handling of the rendering is managed by specialized renderers. * * @author Fabien Potencier <fabien@symfony.com> * * @see FragmentRendererInterface */
class FragmentHandler
{
    private $debug;
    private $renderers = array();
    private $requestStack;

    /** * @param RequestStack $requestStack The Request stack that controls the lifecycle of requests * @param FragmentRendererInterface[] $renderers An array of FragmentRendererInterface instances * @param bool $debug Whether the debug mode is enabled or not */
    public function __construct(RequestStack $requestStackarray $renderers = array(), $debug = false)
    {
        $this->requestStack = $requestStack;
        foreach ($renderers as $renderer) {
            $this->addRenderer($renderer);
        }
        $this->debug = $debug;
    }

    /** * Adds a renderer. */
    public function addRenderer(FragmentRendererInterface $renderer)
    {
        $this->renderers[$renderer->getName()] = $renderer;
    }

    /** * Renders a URI and returns the Response content. * * Available options: * * * ignore_errors: true to return an empty string in case of an error * * @param string|ControllerReference $uri A URI as a string or a ControllerReference instance * @param string $renderer The renderer name * @param array $options An array of options * * @return string|null The Response content or null when the Response is streamed * * @throws \InvalidArgumentException when the renderer does not exist * @throws \LogicException when no master request is being handled */
    public function render($uri$renderer = 'inline'array $options = array())
    {
        if (!isset($options['ignore_errors'])) {
            $options['ignore_errors'] = !$this->debug;
        }

        if (!isset($this->renderers[$renderer])) {
            throw new \InvalidArgumentException(sprintf('The "%s" renderer does not exist.'$renderer));
        }

        if (!$request = $this->requestStack->getCurrentRequest()) {
            throw new \LogicException('Rendering a fragment can only be done when handling a Request.');
        }

        return $this->deliver($this->renderers[$renderer]->render($uri$request$options));
    }

    /** * Delivers the Response as a string. * * When the Response is a StreamedResponse, the content is streamed immediately * instead of being returned. * * @return string|null The Response content or null when the Response is streamed * * @throws \RuntimeException when the Response is not successful */
    protected function deliver(Response $response)
    {
        if (!$response->isSuccessful()) {
            throw new \RuntimeException(sprintf('Error when rendering "%s" (Status code is %s).'$this->requestStack->getCurrentRequest()->getUri(), $response->getStatusCode()));
        }

        if (!$response instanceof StreamedResponse) {
            return $response->getContent();
        }

        $response->sendContent();
    }
}