From 8c1edb7f4eced999c9704ec9ff7ba11d88248bbd Mon Sep 17 00:00:00 2001
From: xue <>
Date: Mon, 22 May 2006 00:19:44 +0000
Subject: Added TFeedService.

---
 framework/Web/Services/TFeedService.php | 156 ++++++++++++++++++++++++++++++++
 1 file changed, 156 insertions(+)
 create mode 100644 framework/Web/Services/TFeedService.php

(limited to 'framework/Web/Services/TFeedService.php')

diff --git a/framework/Web/Services/TFeedService.php b/framework/Web/Services/TFeedService.php
new file mode 100644
index 00000000..96f6cef4
--- /dev/null
+++ b/framework/Web/Services/TFeedService.php
@@ -0,0 +1,156 @@
+<?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 &copy; 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 &lt;feed&gt; element. Initial property
+ * values can be configured in a &lt;feed&gt; 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 '';
+	}
+}
+
+?>
\ No newline at end of file
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