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<?php
/**
* TJsonService and TJsonResponse class file.
*
* @author Wei Zhuo <weizhuo[at]gamil[dot]com>
* @link http://www.pradosoft.com/
* @copyright Copyright © 2005-2008 PradoSoft
* @license http://www.pradosoft.com/license/
* @version $Id$
* @package System.Web.Services
*/
/**
* TJsonService class provides to end-users javascript content response in
* JSON format.
*
* TJsonService manages a set of {@link TJsonResponse}, each
* representing specific response with javascript content.
* The service parameter, referring to the ID of the service, specifies
* which javascript content to be provided to end-users.
*
* To use TJsonService, configure it in application configuration as follows,
* <code>
* <service id="json" class="System.Services.TJsonService">
* <json id="get_article" class="Path.To.JsonResponseClass1" .../>
* <json id="register_rating" class="Path.To.JsonResponseClass2" .../>
* </service>
* </code>
* where each JSON response is specified via a <json> element.
* Initial property values can be configured in a <json> element.
*
* To retrieve the JSON content provided by "get_article", use the URL
* <code>index.php?json=get_article</code>
*
* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
* @version $Id$
* @package System.Web.Services
* @since 3.1
*/
class TJsonService extends TService
{
/**
* @var array registered services
*/
private $_services=array();
/**
* Initializes this module.
* This method is required by the IModule interface.
* @param TXmlElement configuration for this module, can be null
*/
public function init($xml)
{
$this->loadJsonServices($xml);
}
/**
* Load the service definitions.
* @param TXmlElement configuration for this module, can be null
*/
protected function loadJsonServices($xml)
{
foreach($xml->getElementsByTagName('json') as $config)
{
if(($id=$config->getAttribute('id'))!==null)
$this->_services[$id]=$config;
else
throw new TConfigurationException('jsonservice_id_required');
}
}
/**
* Runs the service.
* This method is invoked by application automatically.
*/
public function run()
{
$id=$this->getRequest()->getServiceParameter();
if(isset($this->_services[$id]))
{
$serviceConfig=$this->_services[$id];
$properties=$serviceConfig->getAttributes();
if(($class=$properties->remove('class'))!==null)
{
$service=Prado::createComponent($class);
if($service instanceof TJsonResponse)
$this->createJsonResponse($service,$properties,$serviceConfig);
else
throw new TConfigurationException('jsonservice_response_type_invalid',$id);
}
else
throw new TConfigurationException('jsonservice_class_required',$id);
}
else
throw new THttpException(404,'jsonservice_feed_unknown',$id);
}
/**
* Renders content provided by TJsonResponse::getJsonContent() as
* javascript in JSON format.
*/
protected function createJsonResponse($service,$properties,$config)
{
// init service properties
foreach($properties as $name=>$value)
$service->setSubproperty($name,$value);
$service->init($config);
//send content if not null
if(($content=$service->getJsonContent())!==null)
{
$response = $this->getResponse();
$response->setContentType('text/javascript');
$response->setCharset('UTF-8');
$json = Prado::createComponent('System.Web.Javascripts.TJSON');
//send content
$response->write($json->encode($content));
}
}
}
/**
* TJsonResponse Class
*
* TJsonResponse is the base class for all JSON response provider classes.
*
* Derived classes must implement {@link getJsonContent()} to return
* an object or literals to be converted to JSON format. The response
* will be empty if the returned content is null.
*
* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
* @version $Id$
* @package System.Web.Services
* @since 3.1
*/
abstract class TJsonResponse extends TApplicationComponent
{
private $_id='';
/**
* Initializes the feed.
* @param TXmlElement configurations specified in {@link TJsonService}.
*/
public function init($config)
{
}
/**
* @return string ID of this response
*/
public function getID()
{
return $this->_id;
}
/**
* @param string ID of this response
*/
public function setID($value)
{
$this->_id=$value;
}
/**
* @return object json response content, null to supress output.
*/
abstract public function getJsonContent();
}
?>
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