Method setupInstallPaths

/**
 * Method to do any prechecks and setup the install paths for the extension
 *
 * @return  void
 *
 * @since   3.4
 * @throws  \RuntimeException
 */
protected function setupInstallPaths()
{
    // Get the target application
    $cname = (string) $this->getManifest()->attributes()->client;
    if ($cname) {
        // Attempt to map the client to a base path
        $client = ApplicationHelper::getClientInfo($cname, true);
        if ($client === false) {
            throw new \RuntimeException(Text::sprintf('JLIB_INSTALLER_ABORT_MOD_UNKNOWN_CLIENT', Text::_('JLIB_INSTALLER_' . $this->route), $client->name));
        }
        $basePath = $client->path;
        $this->clientId = $client->id;
    } else {
        // No client attribute was found so we assume the site as the client
        $basePath = JPATH_SITE;
        $this->clientId = 0;
    }
    // Set the installation path
    if (empty($this->element)) {
        throw new \RuntimeException(Text::sprintf('JLIB_INSTALLER_ABORT_MOD_INSTALL_NOFILE', Text::_('JLIB_INSTALLER_' . $this->route)));
    }
    $this->parent->setPath('extension_root', $basePath . '/modules/' . $this->element);
}