Method setupUninstall

/**
 * Method to do any prechecks and setup the uninstall job
 *
 * @return  void
 *
 * @since   4.0.0
 */
protected function setupUninstall()
{
    $this->parent->extension = $this->extension;
    $db = $this->parent->getDbo();
    $name = $this->extension->element;
    $clientId = $this->extension->client_id;
    // For a template the id will be the template name which represents the subfolder of the templates folder that the template resides in.
    if (!$name) {
        throw new \RuntimeException(Text::_('JLIB_INSTALLER_ERROR_TPL_UNINSTALL_TEMPLATE_ID_EMPTY'));
    }
    // Deny removing a parent template if there are children
    $query = $db->getQuery(true)->select('COUNT(*)')->from($db->quoteName('#__template_styles'))->where([$db->quoteName('parent') . ' = :template', $db->quoteName('client_id') . ' = :client_id'])->bind(':template', $name)->bind(':client_id', $clientId);
    $db->setQuery($query);
    if ($db->loadResult() != 0) {
        throw new \RuntimeException(Text::_('JLIB_INSTALLER_ERROR_TPL_UNINSTALL_PARENT_TEMPLATE'));
    }
    // Deny remove default template
    $query = $db->getQuery(true)->select('COUNT(*)')->from($db->quoteName('#__template_styles'))->where([$db->quoteName('home') . ' = ' . $db->quote('1'), $db->quoteName('template') . ' = :template', $db->quoteName('client_id') . ' = :client_id'])->bind(':template', $name)->bind(':client_id', $clientId);
    $db->setQuery($query);
    if ($db->loadResult() != 0) {
        throw new \RuntimeException(Text::_('JLIB_INSTALLER_ERROR_TPL_UNINSTALL_TEMPLATE_DEFAULT'));
    }
    // Get the template root path
    $client = ApplicationHelper::getClientInfo($clientId);
    if (!$client) {
        throw new \RuntimeException(Text::_('JLIB_INSTALLER_ERROR_TPL_UNINSTALL_INVALID_CLIENT'));
    }
    $this->parent->setPath('extension_root', $client->path . '/templates/' . strtolower($name));
    $this->parent->setPath('source', $this->parent->getPath('extension_root'));
    // We do findManifest to avoid problem when uninstalling a list of extensions: getManifest cache its manifest file
    $this->parent->findManifest();
    $manifest = $this->parent->getManifest();
    if (!$manifest instanceof \SimpleXMLElement) {
        // Kill the extension entry
        $this->extension->delete($this->extension->extension_id);
        // Make sure we delete the folders
        Folder::delete($this->parent->getPath('extension_root'));
        throw new \RuntimeException(Text::_('JLIB_INSTALLER_ERROR_TPL_UNINSTALL_INVALID_NOTFOUND_MANIFEST'));
    }
    // Attempt to load the language file; might have uninstall strings
    $this->loadLanguage();
}