<?php

/**

 * Zend Framework

 *

 * LICENSE

 *

 * This source file is subject to the new BSD license that is bundled

 * with this package in the file LICENSE.txt.

 * It is also available through the world-wide-web at this URL:

 * http://framework.zend.com/license/new-bsd

 * If you did not receive a copy of the license and are unable to

 * obtain it through the world-wide-web, please send an email

 * to license@zend.com so we can send you a copy immediately.

 *

 * @category   Zend

 * @package    Zend_Service

 * @subpackage Ebay

 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 * @version    $Id: Abstract.php 20166 2010-01-09 19:00:17Z bkarwin $

 */

/**

 * @category   Zend

 * @package    Zend_Service

 * @subpackage Ebay

 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 */

abstract class Zend_Service_Ebay_Finding_Set_Abstract implements SeekableIterator, Countable

{

    /**

     * @var DOMNodeList

     */

    protected $_nodes;

    /**

     * @var integer

     */

    protected $_key = 0;

    /**

     * @param  DOMNodeList $nodes

     * @return void

     */

    public function __construct(DOMNodeList $nodes)

    {

        $this->_nodes = $nodes;

        $this->_init();

    }

    /**

     * Initialize object.

     *

     * Called from {@link __construct()} as final step of object initialization.

     *

     * @return void

     */

    protected function _init()

    {

    }

    /**

     * Implement SeekableIterator::seek()

     *

     * @param  integer $key

     * @throws OutOfBoundsException When $key is not seekable

     * @return void

     */

    public function seek($key)

    {

        if ($key < 0 || $key >= $this->count()) {

            $message = "Position '{$key}' is not seekable.";

            throw new OutOfBoundsException($message);

        }

        $this->_key = $key;

    }

    /**

     * Implement Iterator::key()

     *

     * @return integer

     */

    public function key()

    {

        return $this->_key;

    }

    /**

     * Implement Iterator::next()

     *

     * @return void

     */

    public function next()

    {

        $this->_key++;

    }

    /**

     * Implement Iterator::rewind()

     *

     * @return void

     */

    public function rewind()

    {

        $this->_key = 0;

    }

    /**

     * Implement Iterator::valid()

     *

     * @return boolean

     */

    public function valid()

    {

        return $this->_key >= 0 && $this->_key < $this->count();

    }

    /**

     * Implement Countable::current()

     *

     * @return integer

     */

    public function count()

    {

        return $this->_nodes ? $this->_nodes->length : 0;

    }

}