<?php
/**
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/

declare(strict_types=1);

namespace Magento\Framework\Config;

use Magento\Framework\Filesystem\File\ReadFactory;

/**
* Combine existing file iterator and new files.
*/
class CompositeFileIterator extends FileIterator
{
/**
* @var FileIterator
*/
private $existingIterator;

/**
* @param ReadFactory $readFactory
* @param array $paths
* @param FileIterator $existingIterator
*/
public function __construct(ReadFactory $readFactory, array $paths, FileIterator $existingIterator)
{
parent::__construct($readFactory, $paths);
$this->existingIterator = $existingIterator;
}

/**
* @inheritDoc
*/
public function rewind()
{
$this->existingIterator->rewind();
parent::rewind();
}

/**
* @inheritDoc
*/
public function current()
{
if ($this->existingIterator->valid()) {
return $this->existingIterator->current();
}

return parent::current();
}

/**
* @inheritDoc
*/
public function key()
{
if ($this->existingIterator->valid()) {
return $this->existingIterator->key();
}

return parent::key();
}

/**
* @inheritDoc
*/
public function next()
{
if ($this->existingIterator->valid()) {
$this->existingIterator->next();
} else {
parent::next();
}
}

/**
* @inheritDoc
*/
public function valid()
{
return $this->existingIterator->valid() || parent::valid();
}

/**
* @inheritDoc
*/
public function toArray()
{
return array_merge($this->existingIterator->toArray(), parent::toArray());
}

/**
* @inheritDoc
*/
public function count()
{
return $this->existingIterator->count() + parent::count();
}
}