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<?php
/**
* @package Joomla.Legacy
* @subpackage Library
*
* @copyright Copyright (C) 2005 - 2014 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE
*/
defined('JPATH_PLATFORM') or die;
/**
* Library helper class
*
* @package Joomla.Legacy
* @subpackage Library
* @since 3.2
*/
class JLibraryHelper
{
/**
* The component list cache
*
* @var array
* @since 3.2
*/
protected static $libraries = array();
/**
* Get the library information.
*
* @param string $element Element of the library in the extensions table.
* @param boolean $strict If set and the library does not exist, the enabled attribute will be set to false.
*
* @return object An object with the library's information.
*
* @since 3.2
*/
public static function getLibrary($element, $strict = false)
{
// Is already cached ?
if (isset(static::$libraries[$element]))
{
return static::$libraries[$element];
}
if (static::_load($element))
{
$result = static::$libraries[$element];
}
else
{
$result = new stdClass;
$result->enabled = $strict ? false : true;
$result->params = new JRegistry;
}
return $result;
}
/**
* Checks if a library is enabled
*
* @param string $element Element of the library in the extensions table.
*
* @return boolean
*
* @since 3.2
*/
public static function isEnabled($element)
{
$result = static::getLibrary($element, true);
return $result->enabled;
}
/**
* Gets the parameter object for the library
*
* @param string $element Element of the library in the extensions table.
* @param boolean $strict If set and the library does not exist, false will be returned
*
* @return JRegistry A JRegistry object.
*
* @see JRegistry
* @since 3.2
*/
public static function getParams($element, $strict = false)
{
$library = static::getLibrary($element, $strict);
return $library->params;
}
/**
* Save the parameters object for the library
*
* @param string $element Element of the library in the extensions table.
* @param JRegistry $params Params to save
*
* @return JRegistry A JRegistry object.
*
* @see JRegistry
* @since 3.2
*/
public static function saveParams($element, $params)
{
if (static::isEnabled($element))
{
// Save params in DB
$db = JFactory::getDbo();
$query = $db->getQuery(true)
->update($db->quoteName('#__extensions'))
->set($db->quoteName('params') . ' = ' . $db->quote($params->toString()))
->where($db->quoteName('type') . ' = ' . $db->quote('library'))
->where($db->quoteName('element') . ' = ' . $db->quote($element));
$db->setQuery($query);
$result = $db->execute();
// Update params in libraries cache
if ($result && isset(static::$libraries[$element]))
{
static::$libraries[$element]->params = $params;
}
return $result;
}
return false;
}
/**
* Load the installed libraryes into the libraries property.
*
* @param string $element The element value for the extension
*
* @return boolean True on success
*
* @since 3.2
*/
protected static function _load($element)
{
$db = JFactory::getDbo();
$query = $db->getQuery(true)
->select('extension_id AS id, element AS "option", params, enabled')
->from('#__extensions')
->where($db->quoteName('type') . ' = ' . $db->quote('library'))
->where($db->quoteName('element') . ' = ' . $db->quote($element));
$db->setQuery($query);
$cache = JFactory::getCache('_system', 'callback');
try
{
static::$libraries[$element] = $cache->get(array($db, 'loadObject'), null, $element, false);
}
catch (RuntimeException $e)
{
// Fatal error.
JLog::add(JText::sprintf('JLIB_APPLICATION_ERROR_LIBRARY_NOT_LOADING', $element, $e->getMessage()), JLog::WARNING, 'jerror');
return false;
}
if (empty(static::$libraries[$element]))
{
// Fatal error.
$error = JText::_('JLIB_APPLICATION_ERROR_LIBRARY_NOT_FOUND');
JLog::add(JText::sprintf('JLIB_APPLICATION_ERROR_LIBRARY_NOT_LOADING', $element, $error), JLog::WARNING, 'jerror');
return false;
}
// Convert the params to an object.
if (is_string(static::$libraries[$element]->params))
{
$temp = new JRegistry;
$temp->loadString(static::$libraries[$element]->params);
static::$libraries[$element]->params = $temp;
}
return true;
}
}