CachedFormulaLoader.php

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<?php

/*
 * This file is part of the Assetic package, an OpenSky project.
 *
 * (c) 2010-2014 OpenSky Project Inc
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Assetic\Factory\Loader;

use Assetic\Cache\ConfigCache;
use Assetic\Factory\Resource\IteratorResourceInterface;
use Assetic\Factory\Resource\ResourceInterface;

class CachedFormulaLoader implements FormulaLoaderInterface
{
    private $loader;
    private $configCache;
    private $debug;

    public function __construct(FormulaLoaderInterface $loader, ConfigCache $configCache, $debug = false)
    {
        $this->loader = $loader;
        $this->configCache = $configCache;
        $this->debug = $debug;
    }

    public function load(ResourceInterface $resources)
    {
        if (!$resources instanceof IteratorResourceInterface) {
            $resources = array($resources);
        }

        $formulae = array();

        foreach ($resources as $resource) {
            $id = (string) $resource;
            if (!$this->configCache->has($id) || ($this->debug && !$resource->isFresh($this->configCache->getTimestamp($id)))) {
                $formulae += $this->loader->load($resource);
                $this->configCache->set($id, $formulae);
            } else {
                $formulae += $this->configCache->get($id);
            }
        }

        return $formulae;
    }
}