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<?php
/**
* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
* Copyright 2005-2011, Cake Software Foundation, Inc. (http://cakefoundation.org)
*
* Licensed under The MIT License
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright 2005-2011, Cake Software Foundation, Inc. (http://cakefoundation.org)
* @link http://cakephp.org CakePHP(tm) Project
* @license MIT License (http://www.opensource.org/licenses/mit-license.php)
*/

App::uses('View', 'View');

/**
* A view class that is used for JSON responses.
*
* By setting the '_serialize' key in your controller, you can specify a view variable
* that should be serialized to JSON and used as the response for the request.
* This allows you to omit views + layouts, if your just need to emit a single view
* variable as the JSON response.
*
* In your controller, you could do the following:
*
* `$this->set(array('posts' => $posts, '_serialize' => 'posts'));`
*
* When the view is rendered, the `$posts` view variable will be serialized
* into JSON.
*
* You can also define `'_serialize'` as an array. This will create a top level object containing
* all the named view variables:
*
* {{{
* $this->set(compact('posts', 'users', 'stuff'));
* $this->set('_serialize', array('posts', 'users'));
* }}}
*
* The above would generate a JSON object that looks like:
*
* `{"posts": [...], "users": [...]}`
*
* If you don't use the `_serialize` key, you will need a view. You can use extended
* views to provide layout like functionality.
*
* @package Cake.View
* @since CakePHP(tm) v 2.1.0
*/
class JsonView extends View {

/**
* JSON views are always located in the 'json' sub directory for a
* controllers views.
*
* @var string
*/
public $subDir = 'json';

/**
* Constructor
*
* @param Controller $controller
*/
public function __construct(Controller $controller = null) {
parent::__construct($controller);
if (isset($controller->response) && $controller->response instanceof CakeResponse) {
$controller->response->type('json');
}
}

/**
* Render a JSON view.
*
* Uses the special '_serialize' parameter to convert a set of
* view variables into a JSON response. Makes generating simple
* JSON responses very easy. You can omit the '_serialize' parameter,
* and use a normal view + layout as well.
*
* @param string $view The view being rendered.
* @param string $layout The layout being rendered.
* @return string The rendered view.
*/
public function render($view = null, $layout = null) {
if (isset($this->viewVars['_serialize'])) {
$serialize = $this->viewVars['_serialize'];
if (is_array($serialize)) {
$data = array();
foreach ($serialize as $key) {
$data[$key] = $this->viewVars[$key];
}
} else {
$data = isset($this->viewVars[$serialize]) ? $this->viewVars[$serialize] : null;
}
$content = json_encode($data);
$this->Blocks->set('content', $content);
return $content;
}
if ($view !== false && $viewFileName = $this->_getViewFileName($view)) {
if (!$this->_helpersLoaded) {
$this->loadHelpers();
}
$content = $this->_render($viewFileName);
$this->Blocks->set('content', $content);
return $content;
}
}

}
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