DirSearch.php

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<?php
namespace Magento\Framework\Component;

use Magento\Framework\Filesystem;

class DirSearch
{
    private $registrar;

    private $readFactory;

    public function __construct(ComponentRegistrarInterface $registrar, Filesystem\Directory\ReadFactory $readFactory)
    {
        $this->registrar = $registrar;
        $this->readFactory = $readFactory;
    }

    public function collectFiles($componentType, $pattern)
    {
        return $this->collect($componentType, $pattern, false);
    }

    public function collectFilesWithContext($componentType, $pattern)
    {
        return $this->collect($componentType, $pattern, true);
    }

    private function collect($componentType, $pattern, $withContext)
    {
        $files = [];
        foreach ($this->registrar->getPaths($componentType) as $componentName => $path) {
            $directoryRead = $this->readFactory->create($path);
            $foundFiles = $directoryRead->search($pattern);
            foreach ($foundFiles as $foundFile) {
                $foundFile = $directoryRead->getAbsolutePath($foundFile);
                if ($withContext) {
                    $files[] = new ComponentFile($componentType, $componentName, $foundFile);
                } else {
                    $files[] = $foundFile;
                }
            }
        }
        return $files;
    }
}