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<?php
/**
* TFeedService and TFeed class file
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @author Knut Urdalen <knut.urdalen@gmail.com>
* @link http://www.pradosoft.com
* @copyright Copyright © 2006 PradoSoft
* @license http://www.pradosoft.com/license/
* @package System.Web.Services
*/
/**
* TFeedService class
*
* TFeedService provides to end-users feed content.
*
* TFeedService manages a set of {@link TFeed}, each representing specific feed content.
* The service parameter, referring to the ID of the feed, specifies
* which feed content to be provided to end-users.
*
* To use TFeedService, configure it in application configuration as follows,
* <code>
* <service id="feed" class="System.Services.TFeedService">
* <feed id="ch1" class="Path.To.FeedClass1" .../>
* <feed id="ch2" class="Path.To.FeedClass2" .../>
* <feed id="ch3" class="Path.To.FeedClass3" .../>
* </service>
* </code>
* where each feed is specified via a <feed> element. Initial property
* values can be configured in a <feed> element.
*
* To retrieve the feed content provided by "ch2", use the URL
* <code>index.php?feed=ch2</code>
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @author Knut Urdalen <knut.urdalen@gmail.com>
* @package System.Web.Services
* @since 3.1
*/
class TFeedService extends TService
{
private $_feeds=array();
/**
* Initializes this module.
* This method is required by the IModule interface.
* @param TXmlElement configuration for this module, can be null
*/
public function init($config)
{
foreach($config->getElementsByTagName('feed') as $feed)
{
if(($id=$feed->getAttribute('id'))!==null)
$this->_feeds[$id]=$feed;
else
throw new TConfigurationException('feedservice_id_required');
}
}
/**
* @return string the requested feed path
*/
protected function determineRequestedFeedPath()
{
return $this->getRequest()->getServiceParameter();
}
/**
* Runs the service.
* This method is invoked by application automatically.
*/
public function run()
{
$id=$this->getRequest()->getServiceParameter();
if(isset($this->_feeds[$id]))
{
$feedConfig=$this->_feeds[$id];
$properties=$feedConfig->getAttributes();
if(($class=$properties->remove('class'))!==null)
{
$feed=Prado::createComponent($class);
if($feed instanceof TFeed)
{
// init feed properties
foreach($properties as $name=>$value)
$feed->setSubproperty($name,$value);
$feed->init($feedConfig);
$content=$feed->getFeedContent();
//$this->getResponse()->setContentType('application/rss+xml');
$this->getResponse()->setContentType('text/xml');
$this->getResponse()->write($content);
}
else
throw new TConfigurationException('feedservice_feedtype_invalid',$id);
}
else
throw new TConfigurationException('feedservice_class_required',$id);
}
else
throw new THttpException(404,'feedservice_feed_unknown',$id);
}
}
/**
* TFeed class.
*
* TFeed is the base class for all feed provider classes.
*
* Derived classes should override {@link getFeedContent()} to return
* an XML string that represents the feed content.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @version $Revision: $ $Date: $
* @package System.Services
* @since 3.1
*/
abstract class TFeed extends TApplicationComponent
{
private $_id='';
/**
* Initializes the feed.
* @param TXmlElement configurations specified in {@link TFeedService}.
*/
public function init($config)
{
}
/**
* @return string ID of this feed
*/
public function getID()
{
return $this->_id;
}
/**
* @param string ID of this feed
*/
public function setID($value)
{
$this->_id=$value;
}
/**
* @return string an XML string representing the feed content
*/
public function getFeedContent()
{
return '';
}
}
?>
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