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<?php
/**
* Zend Framework (http://framework.zend.com/)
*
* @link http://github.com/zendframework/zf2 for the canonical source repository
* @copyright Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @package Zend_Dom
*/

namespace Zend\Dom;

use Countable;
use DOMDocument;
use DOMNodeList;
use DOMNode;
use Iterator;

/**
* Nodelist for DOM XPath query
*
* @package Zend_Dom
* @subpackage Query
*/
class NodeList implements Iterator, Countable
{
    /**
* CSS Selector query
* @var string
*/
    protected $cssQuery;

    /**
* @var DOMDocument
*/
    protected $document;

    /**
* @var DOMNodeList
*/
    protected $nodeList;

    /**
* Current iterator position
* @var int
*/
    protected $position = 0;

    /**
* XPath query
* @var string
*/
    protected $xpathQuery;

    /**
* Constructor
*
* @param string $cssQuery
* @param string|array $xpathQuery
* @param DOMDocument $document
* @param DOMNodeList $nodeList
* @return void
*/
    public function __construct($cssQuery, $xpathQuery, DOMDocument $document, DOMNodeList $nodeList)
    {
        $this->cssQuery = $cssQuery;
        $this->xpathQuery = $xpathQuery;
        $this->document = $document;
        $this->nodeList = $nodeList;
    }

    /**
* Retrieve CSS Query
*
* @return string
*/
    public function getCssQuery()
    {
        return $this->cssQuery;
    }

    /**
* Retrieve XPath query
*
* @return string
*/
    public function getXpathQuery()
    {
        return $this->xpathQuery;
    }

    /**
* Retrieve DOMDocument
*
* @return DOMDocument
*/
    public function getDocument()
    {
        return $this->document;
    }

    /**
* Iterator: rewind to first element
*
* @return DOMNode
*/
    public function rewind()
    {
        $this->position = 0;

        return $this->nodeList->item(0);
    }

    /**
* Iterator: is current position valid?
*
* @return bool
*/
    public function valid()
    {
        if (in_array($this->position, range(0, $this->nodeList->length - 1)) && $this->nodeList->length > 0) {
            return true;
        }

        return false;
    }

    /**
* Iterator: return current element
*
* @return DOMNode
*/
    public function current()
    {
        return $this->nodeList->item($this->position);
    }

    /**
* Iterator: return key of current element
*
* @return int
*/
    public function key()
    {
        return $this->position;
    }

    /**
* Iterator: move to next element
*
* @return DOMNode
*/
    public function next()
    {
        ++$this->position;

        return $this->nodeList->item($this->position);
    }

    /**
* Countable: get count
*
* @return int
*/
    public function count()
    {
        return $this->nodeList->length;
    }
}
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