<?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_Controller
 * @subpackage Zend_Controller_Action_Helper
 * @copyright  Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: Json.php 9098 2008-03-30 19:29:10Z thomas $
 */

/**
 * @see Zend_Controller_Action_Helper_Abstract
 */
require_once 'Zend/Controller/Action/Helper/Abstract.php';

/**
 * Simplify AJAX context switching based on requested format
 *
 * @uses       Zend_Controller_Action_Helper_Abstract
 * @category   Zend
 * @package    Zend_Controller
 * @subpackage Zend_Controller_Action_Helper
 * @copyright  Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Controller_Action_Helper_Json extends Zend_Controller_Action_Helper_Abstract
{
    /**
     * Suppress exit when sendJson() called
     * @var boolean
     */
    public $suppressExit = false;

    /**
     * Create JSON response
     *
     * Encodes and returns data to JSON. Content-Type header set to 
     * 'application/json', and disables layouts and viewRenderer (if being 
     * used).
     *
     * @param  mixed   $data
     * @param  boolean $keepLayouts
     * @throws Zend_Controller_Action_Helper_Json
     * @return string
     */
    public function encodeJson($data, $keepLayouts = false)
    {
        /**
         * @see Zend_View_Helper_Json
         */
        require_once 'Zend/View/Helper/Json.php';
        $jsonHelper = new Zend_View_Helper_Json();
        $data = $jsonHelper->json($data, $keepLayouts);

        if (!$keepLayouts) {
            /**
             * @see Zend_Controller_Action_HelperBroker
             */
            require_once 'Zend/Controller/Action/HelperBroker.php';
            Zend_Controller_Action_HelperBroker::getStaticHelper('viewRenderer')->setNoRender(true);
        }

        return $data;
    }

    /**
     * Encode JSON response and immediately send
     * 
     * @param  mixed   $data 
     * @param  boolean $keepLayouts 
     * @return string|void
     */
    public function sendJson($data, $keepLayouts = false)
    {
        $data = $this->encodeJson($data, $keepLayouts);
        $response = $this->getResponse();
        $response->setBody($data);

        if (!$this->suppressExit) {
            $response->sendResponse();
            exit;
        }

        return $data;
    }

    /**
     * Strategy pattern: call helper as helper broker method
     *
     * Allows encoding JSON. If $sendNow is true, immediately sends JSON 
     * response. 
     * 
     * @param  mixed   $data 
     * @param  boolean $sendNow 
     * @param  boolean $keepLayouts 
     * @return string|void
     */
    public function direct($data, $sendNow = true, $keepLayouts = false)
    {
        if ($sendNow) {
            return $this->sendJson($data, $keepLayouts);
        }
        return $this->encodeJson($data, $keepLayouts);
    }
}
