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<?php
/**
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/
namespace Magento\Framework\View\Asset;
use Magento\Framework\App\ObjectManager;
/**
* \Iterator that aggregates one or more assets and provides a single public file with equivalent behavior
*/
class Merged implements \Iterator
{
/**
* Directory for dynamically generated public view files, relative to STATIC_VIEW
*/
const CACHE_VIEW_REL = '_cache';
/**
* @var \Psr\Log\LoggerInterface
*/
protected $logger;
/**
* @var MergeStrategyInterface
*/
protected $mergeStrategy;
/**
* @var \Magento\Framework\View\Asset\Repository
*/
private $assetRepo;
/**
* @var MergeableInterface[]
*/
protected $assets;
/**
* @var string
*/
protected $contentType;
/**
* @var \Magento\Framework\App\View\Deployment\Version\StorageInterface
*/
private $versionStorage;
/**
* @var bool
*/
protected $isInitialized = false;
/**
* Merged constructor.
*
* @param \Psr\Log\LoggerInterface $logger
* @param MergeStrategyInterface $mergeStrategy
* @param \Magento\Framework\View\Asset\Repository $assetRepo
* @param MergeableInterface[] $assets
* @param \Magento\Framework\App\View\Deployment\Version\StorageInterface $versionStorage
* @throws \InvalidArgumentException
*/
public function __construct(
\Psr\Log\LoggerInterface $logger,
MergeStrategyInterface $mergeStrategy,
\Magento\Framework\View\Asset\Repository $assetRepo,
array $assets,
\Magento\Framework\App\View\Deployment\Version\StorageInterface $versionStorage = null
) {
$this->logger = $logger;
$this->mergeStrategy = $mergeStrategy;
$this->assetRepo = $assetRepo;
$this->versionStorage = $versionStorage ?: ObjectManager::getInstance()->get(
\Magento\Framework\App\View\Deployment\Version\StorageInterface::class
);
if (!$assets) {
throw new \InvalidArgumentException('At least one asset has to be passed for merging.');
}
/** @var $asset MergeableInterface */
foreach ($assets as $asset) {
if (!($asset instanceof MergeableInterface)) {
throw new \InvalidArgumentException(
'Asset has to implement \Magento\Framework\View\Asset\MergeableInterface.'
);
}
if (!$this->contentType) {
$this->contentType = $asset->getContentType();
} elseif ($asset->getContentType() != $this->contentType) {
throw new \InvalidArgumentException(
"Content type '{$asset->getContentType()}' cannot be merged with '{$this->contentType}'."
);
}
}
$this->assets = $assets;
}
/**
* Attempt to merge assets, falling back to original non-merged ones, if merging fails
*
* @return void
*/
protected function initialize()
{
if (!$this->isInitialized) {
$this->isInitialized = true;
try {
$mergedAsset = $this->createMergedAsset($this->assets);
$this->mergeStrategy->merge($this->assets, $mergedAsset);
$this->assets = [$mergedAsset];
} catch (\Exception $e) {
$this->logger->critical($e);
}
}
}
/**
* Create an asset object for merged file
*
* @param array $assets
* @return MergeableInterface
*/
private function createMergedAsset(array $assets)
{
$paths = [];
/** @var MergeableInterface $asset */
foreach ($assets as $asset) {
$paths[] = $asset->getPath();
}
$paths = array_unique($paths);
$version = $this->versionStorage->load();
if ($version) {
$paths[] = $version;
}
$filePath = md5(implode('|', $paths)) . '.' . $this->contentType;
return $this->assetRepo->createArbitrary($filePath, self::getRelativeDir());
}
/**
* {@inheritdoc}
*
* @return AssetInterface
*/
public function current()
{
$this->initialize();
return current($this->assets);
}
/**
* {@inheritdoc}
*/
public function key()
{
$this->initialize();
return key($this->assets);
}
/**
* {@inheritdoc}
*/
public function next()
{
$this->initialize();
next($this->assets);
}
/**
* {@inheritdoc}
*/
public function rewind()
{
$this->initialize();
reset($this->assets);
}
/**
* {@inheritdoc}
*/
public function valid()
{
$this->initialize();
return (bool)current($this->assets);
}
/**
* Returns directory for storing merged files relative to STATIC_VIEW
*
* @return string
*/
public static function getRelativeDir()
{
return self::CACHE_VIEW_REL . '/merged';
}
}