RecursiveDirectoryIterator.php

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<?php
declare(strict_types=1);

namespace ILIAS\Filesystem\Finder\Iterator;

use ILIAS\Filesystem\DTO\Metadata;
use ILIAS\Filesystem\Filesystem;

class RecursiveDirectoryIterator implements \RecursiveIterator
{
    private $filesystem;

    protected $dir;

    protected $files = [];

    public function __construct(Filesystem $filesystem, string $dir)
    {
        $this->filesystem = $filesystem;
        $this->dir = $dir;
    }

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

    public function next()
    {
        next($this->files);
    }

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

    public function valid()
    {
        return $this->current() instanceof Metadata;
    }

    public function rewind()
    {
        $contents = $this->filesystem->listContents($this->dir, false);
        $this->files = array_combine(array_map(function (Metadata $metadata) {
            return $metadata->getPath();
        }, $contents), $contents);
    }

    public function hasChildren()
    {
        return $this->current()->isDir();
    }

    public function getChildren()
    {
        return new self($this->filesystem, $this->current()->getPath());
    }
}