FileList.php

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<?php
namespace Magento\Framework\View\File;

use Magento\Framework\View\File;
use Magento\Framework\View\File\FileList\CollateInterface;

class FileList
{
    protected $files = [];

    protected $collator;

    public function __construct(CollateInterface $collator)
    {
        $this->collator = $collator;
    }

    public function getAll()
    {
        return array_values($this->files);
    }

    public function add(array $files)
    {
        foreach ($files as $file) {
            $identifier = $file->getFileIdentifier();
            if (array_key_exists($identifier, $this->files)) {
                $filename = $this->files[$identifier]->getFilename();
                throw new \LogicException(
                    "View file '{$file->getFilename()}' is indistinguishable from the file '{$filename}'."
                );
            }
            $this->files[$identifier] = $file;
        }
    }

    public function replace(array $files)
    {
        $this->files = $this->collator->collate($files, $this->files);
    }
}