<?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_Rackspace

 * @subpackage Files

 * @copyright  Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)

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

 */

require_once 'Zend/Service/Rackspace/Files/Container.php';

require_once 'Zend/Service/Rackspace/Files.php';

/**

 * List of servers retrived from the Rackspace web service

 *

 * @uses       ArrayAccess

 * @uses       Countable

 * @uses       Iterator

 * @uses       OutOfBoundsException

 * @uses       Zend_Service_Rackspace_Files_Container

 * @category   Zend

 * @package    Zend_Service_Rackspace

 * @subpackage Files

 * @copyright  Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)

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

 */

class Zend_Service_Rackspace_Files_ContainerList implements Countable, Iterator, ArrayAccess

{

    /**

     * @var array Array of Zend_Service_Rackspace_Files_Container

     */

    protected $objects = array();

    /**

     * @var int Iterator key

     */

    protected $iteratorKey = 0;

    /**

     * @var RackspaceFiles

     */

    protected $service;

    /**

     * Constructor

     *

     * @param  array $list

     * @return boolean

     */

    public function __construct($service,$list = array())

    {

        if (!($service instanceof Zend_Service_Rackspace_Files ) || !is_array($list)) {

            require_once 'Zend/Service/Rackspace/Files/Exception.php';

            throw new Zend_Service_Rackspace_Files_Exception("You must pass a Zend_Service_Rackspace_Files_Exception object and an array");

        }

        $this->service= $service;

        $this->_constructFromArray($list);

    }

    /**

     * Transforms the Array to array of container

     *

     * @param  array $list

     * @return void

     */

    private function _constructFromArray(array $list)

    {

        foreach ($list as $container) {

            $this->_addObject(new Zend_Service_Rackspace_Files_Container($this->service,$container));

        }

    }

    /**

     * Add an object

     *

     * @param  Zend_Service_Rackspace_Files_Container $obj

     * @return Zend_Service_Rackspace_Files_ContainerList

     */

    protected function _addObject (Zend_Service_Rackspace_Files_Container $obj)

    {

        $this->objects[] = $obj;

        return $this;

    }

    /**

     * Return number of servers

     *

     * Implement Countable::count()

     *

     * @return int

     */

    public function count()

    {

        return count($this->objects);

    }

    /**

     * Return the current element

     *

     * Implement Iterator::current()

     *

     * @return Zend_Service_Rackspace_Files_Container

     */

    public function current()

    {

        return $this->objects[$this->iteratorKey];

    }

    /**

     * Return the key of the current element

     *

     * Implement Iterator::key()

     *

     * @return int

     */

    public function key()

    {

        return $this->iteratorKey;

    }

    /**

     * Move forward to next element

     *

     * Implement Iterator::next()

     *

     * @return void

     */

    public function next()

    {

        $this->iteratorKey += 1;

    }

    /**

     * Rewind the Iterator to the first element

     *

     * Implement Iterator::rewind()

     *

     * @return void

     */

    public function rewind()

    {

        $this->iteratorKey = 0;

    }

    /**

     * Check if there is a current element after calls to rewind() or next()

     *

     * Implement Iterator::valid()

     *

     * @return bool

     */

    public function valid()

    {

        $numItems = $this->count();

        if ($numItems > 0 && $this->iteratorKey < $numItems) {

            return true;

        } else {

            return false;

        }

    }

    /**

     * Whether the offset exists

     *

     * Implement ArrayAccess::offsetExists()

     *

     * @param   int     $offset

     * @return  bool

     */

    public function offsetExists($offset)

    {

        return ($offset < $this->count());

    }

    /**

     * Return value at given offset

     *

     * Implement ArrayAccess::offsetGet()

     *

     * @param   int     $offset

     * @throws  Zend_Service_Rackspace_Files_Exception

     * @return  Zend_Service_Rackspace_Files_Container

     */

    public function offsetGet($offset)

    {

        if ($this->offsetExists($offset)) {

            return $this->objects[$offset];

        } else {

            require_once 'Zend/Service/Rackspace/Files/Exception.php';

            throw new Zend_Service_Rackspace_Files_Exception('Illegal index');

        }

    }

    /**

     * Throws exception because all values are read-only

     *

     * Implement ArrayAccess::offsetSet()

     *

     * @param   int     $offset

     * @param   string  $value

     * @throws  Zend_Service_Rackspace_Files_Exception

     */

    public function offsetSet($offset, $value)

    {

        require_once 'Zend/Service/Rackspace/Files/Exception.php';

        throw new Zend_Service_Rackspace_Files_Exception('You are trying to set read-only property');

    }

    /**

     * Throws exception because all values are read-only

     *

     * Implement ArrayAccess::offsetUnset()

     *

     * @param   int     $offset

     * @throws  Zend_Service_Rackspace_Files_Exception

     */

    public function offsetUnset($offset)

    {

        require_once 'Zend/Service/Rackspace/Files/Exception.php';

        throw new Zend_Service_Rackspace_Files_Exception('You are trying to unset read-only property');

    }

}