<?php
/*
 * This file is part of PharIo\Manifest.
 *
 * (c) Arne Blankerts <arne@blankerts.de>, Sebastian Heuer <sebastian@phpeople.de>, Sebastian Bergmann <sebastian@phpunit.de>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace PharIo\Manifest;

class RequirementCollectionIterator implements \Iterator
{

    /**
     *
     * @var Requirement[]
     */
    private $requirements = [];

    /**
     *
     * @var int
     */
    private $position;

    public function __construct(RequirementCollection $requirements)
    {
        $this->requirements = $requirements->getRequirements();
    }

    public function rewind()
    {
        $this->position = 0;
    }

    /**
     *
     * @return bool
     */
    public function valid()
    {
        return $this->position < count($this->requirements);
    }

    /**
     *
     * @return int
     */
    public function key()
    {
        return $this->position;
    }

    /**
     *
     * @return Requirement
     */
    public function current()
    {
        return $this->requirements[$this->position];
    }

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