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148 lars 1 
<?php declare(strict_types=1);
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/*
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 * This file is part of phpunit/php-code-coverage.
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 *
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 * (c) Sebastian Bergmann <sebastian@phpunit.de>
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 *
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 * For the full copyright and license information, please view the LICENSE
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 * file that was distributed with this source code.
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 */
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namespace SebastianBergmann\CodeCoverage\Node;
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use function count;
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use RecursiveIterator;
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/**
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 * @internal This class is not covered by the backward compatibility promise for phpunit/php-code-coverage
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 */
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final class Iterator implements RecursiveIterator
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{
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    /**
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     * @var int
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     */
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    private $position;
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    /**
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     * @var AbstractNode[]
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     */
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    private $nodes;
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    public function __construct(Directory $node)
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    {
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        $this->nodes = $node->children();
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    }
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    /**
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     * Rewinds the Iterator to the first element.
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     */
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    public function rewind(): void
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    {
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        $this->position = 0;
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    }
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    /**
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     * Checks if there is a current element after calls to rewind() or next().
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     */
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    public function valid(): bool
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    {
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        return $this->position < count($this->nodes);
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    }
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    /**
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     * Returns the key of the current element.
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     */
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    public function key(): int
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    {
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        return $this->position;
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    }
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    /**
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     * Returns the current element.
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     */
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    public function current(): ?AbstractNode
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    {
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        return $this->valid() ? $this->nodes[$this->position] : null;
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    }
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    /**
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     * Moves forward to next element.
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     */
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    public function next(): void
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    {
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        $this->position++;
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    }
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    /**
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     * Returns the sub iterator for the current element.
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     */
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    public function getChildren(): self
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    {
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        return new self($this->nodes[$this->position]);
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    }
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    /**
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     * Checks whether the current element has children.
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     */
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    public function hasChildren(): bool
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    {
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        return $this->nodes[$this->position] instanceof Directory;
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    }
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}