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<?php
/**
* @package Joomla.Platform
* @subpackage Installer
*
* @copyright Copyright (C) 2005 - 2013 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE
*/

defined('JPATH_PLATFORM') or die;

jimport('joomla.base.adapterinstance');
jimport('joomla.filesystem.folder');

/**
* Module installer
*
* @package Joomla.Platform
* @subpackage Installer
* @since 11.1
* @deprecated 13.3
*/
class JInstallerModule extends JAdapterInstance
{
/**
* Install function routing
*
* @var string
* @since 11.1
*/
protected $route = 'Install';

/**
* @var
* @since 11.1
*/
protected $manifest = null;

/**
* @var
* @since 11.1
*/
protected $manifest_script = null;

/**
* Extension name
*
* @var
* @since 11.1
*/
protected $name = null;

/**
* @var
* @since 11.1
*/
protected $element = null;

/**
* @var string
* @since 11.1
*/
protected $scriptElement = null;

/**
* Custom loadLanguage method
*
* @param string $path The path where we find language files
*
* @return void
*
* @since 11.1
*/
public function loadLanguage($path = null)
{
$source = $this->parent->getPath('source');

if (!$source)
{
$this->parent
->setPath(
'source',
($this->parent->extension->client_id ? JPATH_ADMINISTRATOR : JPATH_SITE) . '/modules/' . $this->parent->extension->element
);
}

$this->manifest = $this->parent->getManifest();

if ($this->manifest->files)
{
$element = $this->manifest->files;
$extension = '';

if (count($element->children()))
{
foreach ($element->children() as $file)
{
if ((string) $file->attributes()->module)
{
$extension = strtolower((string) $file->attributes()->module);
break;
}
}
}

if ($extension)
{
$lang = JFactory::getLanguage();
$source = $path ? $path : ($this->parent->extension->client_id ? JPATH_ADMINISTRATOR : JPATH_SITE) . '/modules/' . $extension;
$folder = (string) $element->attributes()->folder;

if ($folder && file_exists($path . '/' . $folder))
{
$source = $path . '/' . $folder;
}

$client = (string) $this->manifest->attributes()->client;
$lang->load($extension . '.sys', $source, null, false, false)
|| $lang->load($extension . '.sys', constant('JPATH_' . strtoupper($client)), null, false, false)
|| $lang->load($extension . '.sys', $source, $lang->getDefault(), false, false)
|| $lang->load($extension . '.sys', constant('JPATH_' . strtoupper($client)), $lang->getDefault(), false, false);
}
}
}

/**
* Custom install method
*
* @return boolean True on success
*
* @since 11.1
*/
public function install()
{
// Get a database connector object
$db = $this->parent->getDbo();

// Get the extension manifest object
$this->manifest = $this->parent->getManifest();

/*
* ---------------------------------------------------------------------------------------------
* Manifest Document Setup Section
* ---------------------------------------------------------------------------------------------
*/

// Set the extensions name
$name = (string) $this->manifest->name;
$name = JFilterInput::getInstance()->clean($name, 'string');
$this->set('name', $name);

// Get the module description
$description = (string) $this->manifest->description;

if ($description)
{
$this->parent->set('message', JText::_($description));
}
else
{
$this->parent->set('message', '');
}

/*
* ---------------------------------------------------------------------------------------------
* Target Application Section
* ---------------------------------------------------------------------------------------------
*/

// Get the target application
if ($cname = (string) $this->manifest->attributes()->client)
{
// Attempt to map the client to a base path
$client = JApplicationHelper::getClientInfo($cname, true);

if ($client === false)
{
$this->parent
->abort(JText::sprintf('JLIB_INSTALLER_ABORT_MOD_UNKNOWN_CLIENT', JText::_('JLIB_INSTALLER_' . $this->route), $client->name));

return false;
}

$basePath = $client->path;
$clientId = $client->id;
}
else
{
// No client attribute was found so we assume the site as the client
$cname = 'site';
$basePath = JPATH_SITE;
$clientId = 0;
}

// Set the installation path
$element = '';

if (count($this->manifest->files->children()))
{
foreach ($this->manifest->files->children() as $file)
{
if ((string) $file->attributes()->module)
{
$element = (string) $file->attributes()->module;
$this->set('element', $element);

break;
}
}
}
if (!empty($element))
{
$this->parent->setPath('extension_root', $basePath . '/modules/' . $element);
}
else
{
$this->parent->abort(JText::sprintf('JLIB_INSTALLER_ABORT_MOD_INSTALL_NOFILE', JText::_('JLIB_INSTALLER_' . $this->route)));

return false;
}

/*
* Check to see if a module by the same name is already installed
* If it is, then update the table because if the files aren't there
* we can assume that it was (badly) uninstalled
* If it isn't, add an entry to extensions
*/
$query = $db->getQuery(true);
$query->select($query->qn('extension_id'))->from($query->qn('#__extensions'));
$query->where($query->qn('element') . ' = ' . $query->q($element))->where($query->qn('client_id') . ' = ' . (int) $clientId);
$db->setQuery($query);

try
{
$db->execute();
}
catch (RuntimeException $e)
{
// Install failed, roll back changes
$this->parent
->abort(JText::sprintf('JLIB_INSTALLER_ABORT_MOD_ROLLBACK', JText::_('JLIB_INSTALLER_' . $this->route), $db->stderr(true)));

return false;
}

$id = $db->loadResult();

/*
* If the module directory already exists, then we will assume that the
* module is already installed or another module is using that
* directory.
* Check that this is either an issue where its not overwriting or it is
* set to upgrade anyway
*/

if (file_exists($this->parent->getPath('extension_root')) && (!$this->parent->isOverwrite() || $this->parent->isUpgrade()))
{
// Look for an update function or update tag
$updateElement = $this->manifest->update;

// Upgrade manually set or update function available or update tag detected
if ($this->parent->isUpgrade() || ($this->parent->manifestClass && method_exists($this->parent->manifestClass, 'update'))
|| $updateElement)
{
// Force this one
$this->parent->setOverwrite(true);
$this->parent->setUpgrade(true);

if ($id)
{
// If there is a matching extension mark this as an update; semantics really
$this->route = 'Update';
}
}
elseif (!$this->parent->isOverwrite())
{
// Overwrite is set
// We didn't have overwrite set, find an update function or find an update tag so lets call it safe
$this->parent
->abort(
JText::sprintf(
'JLIB_INSTALLER_ABORT_MOD_INSTALL_DIRECTORY', JText::_('JLIB_INSTALLER_' . $this->route),
$this->parent->getPath('extension_root')
)
);

return false;
}
}

/*
* ---------------------------------------------------------------------------------------------
* Installer Trigger Loading
* ---------------------------------------------------------------------------------------------
*/

// If there is an manifest class file, let's load it; we'll copy it later (don't have destination yet)
$this->scriptElement = $this->manifest->scriptfile;
$manifestScript = (string) $this->manifest->scriptfile;

if ($manifestScript)
{
$manifestScriptFile = $this->parent->getPath('source') . '/' . $manifestScript;

if (is_file($manifestScriptFile))
{
// Load the file
include_once $manifestScriptFile;
}

// Set the class name
$classname = $element . 'InstallerScript';

if (class_exists($classname))
{
// Create a new instance.
$this->parent->manifestClass = new $classname($this);

// And set this so we can copy it later.
$this->set('manifest_script', $manifestScript);
}
}

// Run preflight if possible (since we know we're not an update)
ob_start();
ob_implicit_flush(false);

if ($this->parent->manifestClass && method_exists($this->parent->manifestClass, 'preflight'))
{
if ($this->parent->manifestClass->preflight($this->route, $this) === false)
{
// Preflight failed, rollback changes
$this->parent->abort(JText::_('JLIB_INSTALLER_ABORT_MOD_INSTALL_CUSTOM_INSTALL_FAILURE'));

return false;
}
}

// Create msg object; first use here
$msg = ob_get_contents();
ob_end_clean();

/*
* ---------------------------------------------------------------------------------------------
* Filesystem Processing Section
* ---------------------------------------------------------------------------------------------
*/

// If the module directory does not exist, lets create it
$created = false;

if (!file_exists($this->parent->getPath('extension_root')))
{
if (!$created = JFolder::create($this->parent->getPath('extension_root')))
{
$this->parent
->abort(
JText::sprintf(
'JLIB_INSTALLER_ABORT_MOD_INSTALL_CREATE_DIRECTORY', JText::_('JLIB_INSTALLER_' . $this->route),
$this->parent->getPath('extension_root')
)
);

return false;
}
}

/*
* Since we created the module directory and will want to remove it if
* we have to roll back the installation, let's add it to the
* installation step stack
*/

if ($created)
{
$this->parent->pushStep(array('type' => 'folder', 'path' => $this->parent->getPath('extension_root')));
}

// Copy all necessary files
if ($this->parent->parseFiles($this->manifest->files, -1) === false)
{
// Install failed, roll back changes
$this->parent->abort();

return false;
}

// If there is a manifest script, let's copy it.
if ($this->get('manifest_script'))
{
$path['src'] = $this->parent->getPath('source') . '/' . $this->get('manifest_script');
$path['dest'] = $this->parent->getPath('extension_root') . '/' . $this->get('manifest_script');

if (!file_exists($path['dest']) || $this->parent->isOverwrite())
{
if (!$this->parent->copyFiles(array($path)))
{
// Install failed, rollback changes
$this->parent->abort(JText::_('JLIB_INSTALLER_ABORT_MOD_INSTALL_MANIFEST'));

return false;
}
}
}

// Parse optional tags
$this->parent->parseMedia($this->manifest->media, $clientId);
$this->parent->parseLanguages($this->manifest->languages, $clientId);

/*
* ---------------------------------------------------------------------------------------------
* Database Processing Section
* ---------------------------------------------------------------------------------------------
*/

$row = JTable::getInstance('extension');

// Was there a module already installed with the same name?
if ($id)
{
// Load the entry and update the manifest_cache
$row->load($id);

// Update name
$row->name = $this->get('name');

// Update manifest
$row->manifest_cache = $this->parent->generateManifestCache();

if (!$row->store())
{
// Install failed, roll back changes
$this->parent
->abort(JText::sprintf('JLIB_INSTALLER_ABORT_MOD_ROLLBACK', JText::_('JLIB_INSTALLER_' . $this->route), $db->stderr(true)));

return false;
}
}
else
{
$row->set('name', $this->get('name'));
$row->set('type', 'module');
$row->set('element', $this->get('element'));

// There is no folder for modules
$row->set('folder', '');
$row->set('enabled', 1);
$row->set('protected', 0);
$row->set('access', $clientId == 1 ? 2 : 0);
$row->set('client_id', $clientId);
$row->set('params', $this->parent->getParams());

// Custom data
$row->set('custom_data', '');
$row->set('manifest_cache', $this->parent->generateManifestCache());

if (!$row->store())
{
// Install failed, roll back changes
$this->parent
->abort(JText::sprintf('JLIB_INSTALLER_ABORT_MOD_ROLLBACK', JText::_('JLIB_INSTALLER_' . $this->route), $db->stderr(true)));

return false;
}

// Since we have created a module item, we add it to the installation step stack
// so that if we have to rollback the changes we can undo it.
$this->parent->pushStep(array('type' => 'extension', 'extension_id' => $row->extension_id));

// Create unpublished module in jos_modules
$name = preg_replace('#[\*?]#', '', JText::_($this->get('name')));
$module = JTable::getInstance('module');
$module->set('title', $name);
$module->set('content', '');
$module->set('module', $this->get('element'));
$module->set('access', '1');
$module->set('showtitle', '1');
$module->set('params', '');
$module->set('client_id', $clientId);
$module->set('language', '*');

$module->store();
}

// Let's run the queries for the module
if (strtolower($this->route) == 'install')
{
$result = $this->parent->parseSQLFiles($this->manifest->install->sql);

if ($result === false)
{
// Install failed, rollback changes
$this->parent
->abort(
JText::sprintf('JLIB_INSTALLER_ABORT_MOD_INSTALL_SQL_ERROR', JText::_('JLIB_INSTALLER_' . $this->route), $db->stderr(true))
);

return false;
}

// Set the schema version to be the latest update version
if ($this->manifest->update)
{
$this->parent->setSchemaVersion($this->manifest->update->schemas, $row->extension_id);
}
}
elseif (strtolower($this->route) == 'update')
{
if ($this->manifest->update)
{
$result = $this->parent->parseSchemaUpdates($this->manifest->update->schemas, $row->extension_id);

if ($result === false)
{
// Install failed, rollback changes
$this->parent->abort(JText::sprintf('JLIB_INSTALLER_ABORT_MOD_UPDATE_SQL_ERROR', $db->stderr(true)));

return false;
}
}
}

// Run the custom method based on the route
ob_start();
ob_implicit_flush(false);

if ($this->parent->manifestClass && method_exists($this->parent->manifestClass, $this->route))
{
if ($this->parent->manifestClass->{$this->route}($this) === false)
{
// Install failed, rollback changes
$this->parent->abort(JText::_('JLIB_INSTALLER_ABORT_MOD_INSTALL_CUSTOM_INSTALL_FAILURE'));

return false;
}
}

// Append messages
$msg .= ob_get_contents();
ob_end_clean();

/**
* ---------------------------------------------------------------------------------------------
* Finalization and Cleanup Section
* ---------------------------------------------------------------------------------------------
*/

// Lastly, we will copy the manifest file to its appropriate place.
if (!$this->parent->copyManifest(-1))
{
// Install failed, rollback changes
$this->parent->abort(JText::_('JLIB_INSTALLER_ABORT_MOD_INSTALL_COPY_SETUP'));

return false;
}

// And now we run the postflight
ob_start();
ob_implicit_flush(false);

if ($this->parent->manifestClass && method_exists($this->parent->manifestClass, 'postflight'))
{
$this->parent->manifestClass->postflight($this->route, $this);
}

// Append messages
$msg .= ob_get_contents();
ob_end_clean();

if ($msg != '')
{
$this->parent->set('extension_message', $msg);
}

return $row->get('extension_id');
}

/**
* Custom update method
*
* This is really a shell for the install system
*
* @return boolean True on success.
*
* @since 11.1
*/
public function update()
{
// Set the overwrite setting
$this->parent->setOverwrite(true);
$this->parent->setUpgrade(true);

// Set the route for the install
$this->route = 'update';

// Go to install which handles updates properly
return $this->install();
}

/**
* Custom discover method
*
* @return array JExtension list of extensions available
*
* @since 11.1
*/
public function discover()
{
$results = array();
$site_list = JFolder::folders(JPATH_SITE . '/modules');
$admin_list = JFolder::folders(JPATH_ADMINISTRATOR . '/modules');
$site_info = JApplicationHelper::getClientInfo('site', true);
$admin_info = JApplicationHelper::getClientInfo('administrator', true);

foreach ($site_list as $module)
{
$manifest_details = JInstaller::parseXMLInstallFile(JPATH_SITE . "/modules/$module/$module.xml");
$extension = JTable::getInstance('extension');
$extension->set('type', 'module');
$extension->set('client_id', $site_info->id);
$extension->set('element', $module);
$extension->set('folder', '');
$extension->set('name', $module);
$extension->set('state', -1);
$extension->set('manifest_cache', json_encode($manifest_details));
$extension->set('params', '{}');
$results[] = clone $extension;
}

foreach ($admin_list as $module)
{
$manifest_details = JInstaller::parseXMLInstallFile(JPATH_ADMINISTRATOR . "/modules/$module/$module.xml");
$extension = JTable::getInstance('extension');
$extension->set('type', 'module');
$extension->set('client_id', $admin_info->id);
$extension->set('element', $module);
$extension->set('folder', '');
$extension->set('name', $module);
$extension->set('state', -1);
$extension->set('manifest_cache', json_encode($manifest_details));
$extension->set('params', '{}');
$results[] = clone $extension;
}

return $results;
}

/**
* Custom discover_install method
*
* @return mixed Extension ID on success, boolean false on failure
*
* @since 11.1
*/
public function discover_install()
{
// Modules are like templates, and are one of the easiest
// If its not in the extensions table we just add it
$client = JApplicationHelper::getClientInfo($this->parent->extension->client_id);
$manifestPath = $client->path . '/modules/' . $this->parent->extension->element . '/' . $this->parent->extension->element . '.xml';
$this->parent->manifest = $this->parent->isManifest($manifestPath);
$description = (string) $this->parent->manifest->description;

if ($description)
{
$this->parent->set('message', JText::_($description));
}
else
{
$this->parent->set('message', '');
}

$this->parent->setPath('manifest', $manifestPath);
$manifest_details = JInstaller::parseXMLInstallFile($this->parent->getPath('manifest'));

// TODO: Re-evaluate this; should we run installation triggers? postflight perhaps?
$this->parent->extension->manifest_cache = json_encode($manifest_details);
$this->parent->extension->state = 0;
$this->parent->extension->name = $manifest_details['name'];
$this->parent->extension->enabled = 1;
$this->parent->extension->params = $this->parent->getParams();

if ($this->parent->extension->store())
{
return $this->parent->extension->get('extension_id');
}
else
{
JLog::add(JText::_('JLIB_INSTALLER_ERROR_MOD_DISCOVER_STORE_DETAILS'), JLog::WARNING, 'jerror');

return false;
}
}

/**
* Refreshes the extension table cache
*
* @return boolean Result of operation, true if updated, false on failure.
*
* @since 11.1
*/
public function refreshManifestCache()
{
$client = JApplicationHelper::getClientInfo($this->parent->extension->client_id);
$manifestPath = $client->path . '/modules/' . $this->parent->extension->element . '/' . $this->parent->extension->element . '.xml';
$this->parent->manifest = $this->parent->isManifest($manifestPath);
$this->parent->setPath('manifest', $manifestPath);
$manifest_details = JInstaller::parseXMLInstallFile($this->parent->getPath('manifest'));
$this->parent->extension->manifest_cache = json_encode($manifest_details);
$this->parent->extension->name = $manifest_details['name'];

if ($this->parent->extension->store())
{
return true;
}
else
{
JLog::add(JText::_('JLIB_INSTALLER_ERROR_MOD_REFRESH_MANIFEST_CACHE'), JLog::WARNING, 'jerror');

return false;
}
}

/**
* Custom uninstall method
*
* @param integer $id The id of the module to uninstall
*
* @return boolean True on success
*
* @since 11.1
*/
public function uninstall($id)
{
$row = null;
$retval = true;
$db = $this->parent->getDbo();

// First order of business will be to load the module object table from the database.
// This should give us the necessary information to proceed.
$row = JTable::getInstance('extension');

if (!$row->load((int) $id) || !strlen($row->element))
{
JLog::add(JText::_('JLIB_INSTALLER_ERROR_MOD_UNINSTALL_ERRORUNKOWNEXTENSION'), JLog::WARNING, 'jerror');

return false;
}

// Is the module we are trying to uninstall a core one?
// Because that is not a good idea...
if ($row->protected)
{
JLog::add(JText::sprintf('JLIB_INSTALLER_ERROR_MOD_UNINSTALL_WARNCOREMODULE', $row->name), JLog::WARNING, 'jerror');

return false;
}

// Get the extension root path
$element = $row->element;
$client = JApplicationHelper::getClientInfo($row->client_id);

if ($client === false)
{
$this->parent->abort(JText::sprintf('JLIB_INSTALLER_ERROR_MOD_UNINSTALL_UNKNOWN_CLIENT', $row->client_id));

return false;
}
$this->parent->setPath('extension_root', $client->path . '/modules/' . $element);

$this->parent->setPath('source', $this->parent->getPath('extension_root'));

// Get the module's manifest objecct
// We do findManifest to avoid problem when uninstalling a list of extensions: getManifest cache its manifest file.
$this->parent->findManifest();
$this->manifest = $this->parent->getManifest();

// Attempt to load the language file; might have uninstall strings
$this->loadLanguage(($row->client_id ? JPATH_ADMINISTRATOR : JPATH_SITE) . '/modules/' . $element);

// If there is an manifest class file, let's load it
$this->scriptElement = $this->manifest->scriptfile;
$manifestScript = (string) $this->manifest->scriptfile;

if ($manifestScript)
{
$manifestScriptFile = $this->parent->getPath('extension_root') . '/' . $manifestScript;

if (is_file($manifestScriptFile))
{
// Load the file
include_once $manifestScriptFile;
}

// Set the class name
$classname = $element . 'InstallerScript';

if (class_exists($classname))
{
// Create a new instance
$this->parent->manifestClass = new $classname($this);

// And set this so we can copy it later
$this->set('manifest_script', $manifestScript);
}
}

ob_start();
ob_implicit_flush(false);

// Run uninstall if possible
if ($this->parent->manifestClass && method_exists($this->parent->manifestClass, 'uninstall'))
{
$this->parent->manifestClass->uninstall($this);
}

$msg = ob_get_contents();
ob_end_clean();

if ($msg != '')
{
$this->parent->set('extension_message', $msg);
}

if (!($this->manifest instanceof SimpleXMLElement))
{
// Make sure we delete the folders
JFolder::delete($this->parent->getPath('extension_root'));
JLog::add(JText::_('JLIB_INSTALLER_ERROR_MOD_UNINSTALL_INVALID_NOTFOUND_MANIFEST'), JLog::WARNING, 'jerror');

return false;
}

// Let's run the uninstall queries for the module
$result = $this->parent->parseSQLFiles($this->manifest->uninstall->sql);

if ($result === false)
{
// Install failed, rollback changes
JLog::add(JText::sprintf('JLIB_INSTALLER_ERROR_MOD_UNINSTALL_SQL_ERROR', $db->stderr(true)), JLog::WARNING, 'jerror');
$retval = false;
}

// Remove the schema version
$query = $db->getQuery(true);
$query->delete()->from('#__schemas')->where('extension_id = ' . $row->extension_id);
$db->setQuery($query);
$db->execute();

// Remove other files
$this->parent->removeFiles($this->manifest->media);
$this->parent->removeFiles($this->manifest->languages, $row->client_id);

// Let's delete all the module copies for the type we are uninstalling
$query = $db->getQuery(true);
$query->select($query->qn('id'))->from($query->qn('#__modules'));
$query->where($query->qn('module') . ' = ' . $query->q($row->element));
$query->where($query->qn('client_id') . ' = ' . (int) $row->client_id);
$db->setQuery($query);

try
{
$modules = $db->loadColumn();
}
catch (RuntimeException $e)
{
$modules = array();
}

// Do we have any module copies?
if (count($modules))
{
// Ensure the list is sane
JArrayHelper::toInteger($modules);
$modID = implode(',', $modules);

// Wipe out any items assigned to menus
$query = 'DELETE' . ' FROM #__modules_menu' . ' WHERE moduleid IN (' . $modID . ')';
$db->setQuery($query);

try
{
$db->execute();
}
catch (RuntimeException $e)
{
JLog::add(JText::sprintf('JLIB_INSTALLER_ERROR_MOD_UNINSTALL_EXCEPTION', $db->stderr(true)), JLog::WARNING, 'jerror');
$retval = false;
}

// Wipe out any instances in the modules table
$query = 'DELETE' . ' FROM #__modules' . ' WHERE id IN (' . $modID . ')';
$db->setQuery($query);

try
{
$db->execute();
}
catch (RuntimeException $e)
{
JLog::add(JText::sprintf('JLIB_INSTALLER_ERROR_MOD_UNINSTALL_EXCEPTION', $db->stderr(true)), JLog::WARNING, 'jerror');
$retval = false;
}
}

// Now we will no longer need the module object, so let's delete it and free up memory
$row->delete($row->extension_id);
$query = 'DELETE FROM #__modules WHERE module = ' . $db->Quote($row->element) . ' AND client_id = ' . $row->client_id;
$db->setQuery($query);

try
{
// Clean up any other ones that might exist as well
$db->execute();
}
catch (RuntimeException $e)
{
// Ignore the error...
}

unset($row);

// Remove the installation folder
if (!JFolder::delete($this->parent->getPath('extension_root')))
{
// JFolder should raise an error
$retval = false;
}

return $retval;
}

/**
* Custom rollback method
* - Roll back the menu item
*
* @param array $arg Installation step to rollback
*
* @return boolean True on success
*
* @since 11.1
*/
protected function _rollback_menu($arg)
{
// Get database connector object
$db = $this->parent->getDbo();

// Remove the entry from the #__modules_menu table
$query = 'DELETE' . ' FROM #__modules_menu' . ' WHERE moduleid=' . (int) $arg['id'];
$db->setQuery($query);

try
{
return $db->execute();
}
catch (RuntimeException $e)
{
return false;
}
}

/**
* Custom rollback method
* - Roll back the module item
*
* @param array $arg Installation step to rollback
*
* @return boolean True on success
*
* @since 11.1
*/
protected function _rollback_module($arg)
{
// Get database connector object
$db = $this->parent->getDbo();

// Remove the entry from the #__modules table
$query = 'DELETE' . ' FROM #__modules' . ' WHERE id=' . (int) $arg['id'];
$db->setQuery($query);

try
{
return $db->execute();
}
catch (RuntimeException $e)
{
return false;
}
}
}
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