/home/edulekha/studygroup.edulekha.com/ow_plugins/newsfeed/classes/format_manager.php
<?php
/**
* This software is intended for use with Oxwall Free Community Software http://www.oxwall.org/ and is
* licensed under The BSD license.
* ---
* Copyright (c) 2011, Oxwall Foundation
* All rights reserved.
* Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
* following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice, this list of conditions and
* the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright notice, this list of conditions and
* the following disclaimer in the documentation and/or other materials provided with the distribution.
*
* - Neither the name of the Oxwall Foundation nor the names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
*
* @author Sergey Kambalin <greyexpert@gmail.com>
* @package ow_plugins.newsfeed.classes
* @since 1.0
*/
class NEWSFEED_CLASS_FormatManager
{
const FORMAT_EMPTY = "empty";
/**
* Singleton instance.
*
* @var NEWSFEED_CLASS_FormatManager
*/
private static $classInstance;
/**
* Returns an instance of class (singleton pattern implementation).
*
* @return NEWSFEED_CLASS_FormatManager
*/
public static function getInstance()
{
if ( self::$classInstance === null )
{
self::$classInstance = new self();
}
return self::$classInstance;
}
private $formats = array();
/**
*
* @var OW_Plugin
*/
private $plugin;
private function __construct()
{
$this->plugin = OW::getPluginManager()->getPlugin("newsfeed");
}
public function getFormatNames()
{
return array_keys($this->formats);
}
public function renderFormat( $name, $vars )
{
$beforeRenderEvent = new OW_Event("feed.before_render_format", array(
"format" => $name,
"vars" => $vars
), $vars);
OW::getEventManager()->trigger($beforeRenderEvent);
$renderEvent = new OW_Event("feed.render_format", array(
"format" => $name,
"vars" => $beforeRenderEvent->getData()
), null);
OW::getEventManager()->trigger($renderEvent);
$rendered = $renderEvent->getData();
if ( $rendered === null )
{
if ( empty($this->formats[$name]) )
{
throw new InvalidArgumentException("Undefined Newsfeed format `$name`");
}
$formatClass = $this->formats[$name];
/* @var $formatObject NEWSFEED_CLASS_Format */
$formatObject = new $formatClass($vars, $name);
$rendered = $formatObject->render();
}
$afterRenderEvent = new OW_Event("feed.after_render_format", array(
"format" => $name,
"vars" => $vars
), $rendered);
OW::getEventManager()->trigger($afterRenderEvent);
return $afterRenderEvent->getData();
}
public function addFormat($name, $className)
{
$this->formats[$name] = $className;
}
public function collectFormats()
{
$event = new BASE_CLASS_EventCollector("feed.collect_formats");
OW::getEventManager()->trigger($event);
foreach ( $event->getData() as $format )
{
$this->addFormat($format["name"], $format["class"]);
}
}
public function init()
{
OW::getAutoloader()->addPackagePointer("NEWSFEED_FORMAT", $this->plugin->getRootDir() . "formats" . DS);
OW::getAutoloader()->addPackagePointer("NEWSFEED_MFORMAT", $this->plugin->getMobileDir() . "formats" . DS);
OW::getEventManager()->bind(OW_EventManager::ON_PLUGINS_INIT, array($this, "collectFormats"));
}
}