<?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_View

 * @subpackage Helper

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

 */

/**

 * Helper for alternating between set of values

 *

 * @package    Zend_View

 * @subpackage Helper

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

 */

class Zend_View_Helper_Cycle implements Iterator

{

    /**

     * Default name

     * @var string

     */

    const DEFAULT_NAME = 'default';

    /**

     * Pointers

     *

     * @var array

     */

    protected $_pointers = array(self::DEFAULT_NAME =>-1) ;

    /**

     * Array of values

     *

     * @var array

     */

    protected $_data = array(self::DEFAULT_NAME=>array());

    /**

     * Actual name of cycle

     *

     * @var string

     */

    protected $_name = self::DEFAULT_NAME;

    /**

     * Add elements to alternate

     *

     * @param array $data

     * @param string $name

     * @return Zend_View_Helper_Cycle

     */

    public function cycle(array $data = array(), $name = self::DEFAULT_NAME)

    {

        if(!empty($data))

           $this->_data[$name] = $data;

        $this->setName($name);

        return $this;

    }

    /**

     * Add elements to alternate

     *

     * @param array $data

     * @param string $name

     * @return Zend_View_Helper_Cycle

     */

    public function assign(Array $data , $name = self::DEFAULT_NAME)

    {

        $this->setName($name);

        $this->_data[$name] = $data;

        $this->rewind();

        return $this;

    }

    /**

     * Sets actual name of cycle

     *

     * @param string $name

     * @return Zend_View_Helper_Cycle

     */

    public function setName($name = self::DEFAULT_NAME)

    {

       $this->_name = $name;

       if(!isset($this->_data[$this->_name]))

         $this->_data[$this->_name] = array();

       if(!isset($this->_pointers[$this->_name]))

         $this->rewind();

       return $this;

    }

    /**

     * Gets actual name of cycle

     *

     * @return string

     */

    public function getName()

    {

        return $this->_name;

    }

    /**

     * Return all elements

     *

     * @return array

     */

    public function getAll()

    {

        return $this->_data[$this->_name];

    }

    /**

     * Turn helper into string

     *

     * @return string

     */

    public function toString()

    {

        return (string) $this->_data[$this->_name][$this->key()];

    }

    /**

     * Cast to string

     *

     * @return string

     */

    public function __toString()

    {

        return $this->toString();

    }

    /**

     * Move to next value

     *

     * @return Zend_View_Helper_Cycle

     */

    public function next()

    {

        $count = count($this->_data[$this->_name]);

        if ($this->_pointers[$this->_name] == ($count - 1))

            $this->_pointers[$this->_name] = 0;

        else

            $this->_pointers[$this->_name] = ++$this->_pointers[$this->_name];

        return $this;

    }

    /**

     * Move to previous value

     *

     * @return Zend_View_Helper_Cycle

     */

    public function prev()

    {

        $count = count($this->_data[$this->_name]);

        if ($this->_pointers[$this->_name] <= 0)

            $this->_pointers[$this->_name] = $count - 1;

        else

            $this->_pointers[$this->_name] = --$this->_pointers[$this->_name];

        return $this;

    }

    /**

     * Return iteration number

     *

     * @return int

     */

    public function key()

    {

        if ($this->_pointers[$this->_name] < 0)

            return 0;

        else

            return $this->_pointers[$this->_name];

    }

    /**

     * Rewind pointer

     *

     * @return Zend_View_Helper_Cycle

     */

    public function rewind()

    {

        $this->_pointers[$this->_name] = -1;

        return $this;

    }

    /**

     * Check if element is valid

     *

     * @return bool

     */

    public function valid()

    {

        return isset($this->_data[$this->_name][$this->key()]);

    }

    /**

     * Return  current element

     *

     * @return mixed

     */

    public function current()

    {

        return $this->_data[$this->_name][$this->key()];

    }

}