<?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

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

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

 */

/** Zend_View_Helper_Abstract */

require_once 'Zend/View/Helper/Abstract.php';

/**

 * Helper for interacting with UserAgent instance

 *

 * @package    Zend_View

 * @subpackage Helper

 * @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_View_Helper_UserAgent extends Zend_View_Helper_Abstract

{

    /**

     * UserAgent instance

     *

     * @var Zend_Http_UserAgent

     */

    protected $_userAgent = null;

    /**

     * Helper method: retrieve or set UserAgent instance

     *

     * @param  null|Zend_Http_UserAgent $userAgent

     * @return Zend_Http_UserAgent

     */

    public function userAgent(Zend_Http_UserAgent $userAgent = null)

    {

        if (null !== $userAgent) {

            $this->setUserAgent($userAgent);

        }

        return $this->getUserAgent();

    }

    /**

     * Set UserAgent instance

     *

     * @param  Zend_Http_UserAgent $userAgent

     * @return Zend_View_Helper_UserAgent

     */

    public function setUserAgent(Zend_Http_UserAgent $userAgent)

    {

        $this->_userAgent = $userAgent;

        return $this;

    }

    /**

     * Retrieve UserAgent instance

     *

     * If none set, instantiates one using no configuration

     *

     * @return Zend_Http_UserAgent

     */

    public function getUserAgent()

    {

        if (null === $this->_userAgent) {

            require_once 'Zend/Http/UserAgent.php';

            $this->setUserAgent(new Zend_Http_UserAgent());

        }

        return $this->_userAgent;

    }

}