Method install

// Adapter functions
/**
 * Package installation method
 *
 * @param   string  $path  Path to package source folder
 *
 * @return  boolean  True if successful
 *
 * @since   3.1
 */
public function install($path = null)
{
    if ($path && Folder::exists($path)) {
        $this->setPath('source', $path);
    } else {
        $this->abort(Text::_('JLIB_INSTALLER_ABORT_NOINSTALLPATH'));
        return false;
    }
    if (!($adapter = $this->setupInstall('install', true))) {
        $this->abort(Text::_('JLIB_INSTALLER_ABORT_DETECTMANIFEST'));
        return false;
    }
    if (!\is_object($adapter)) {
        return false;
    }
    // Add the languages from the package itself
    if (method_exists($adapter, 'loadLanguage')) {
        $adapter->loadLanguage($path);
    }
    // Fire the onExtensionBeforeInstall event.
    PluginHelper::importPlugin('extension');
    Factory::getApplication()->triggerEvent('onExtensionBeforeInstall', array('method' => 'install', 'type' => $this->manifest->attributes()->type, 'manifest' => $this->manifest, 'extension' => 0));
    // Run the install
    $result = $adapter->install();
    // Make sure Joomla can figure out what has changed
    clearstatcache();
    // Fire the onExtensionAfterInstall
    Factory::getApplication()->triggerEvent('onExtensionAfterInstall', array('installer' => clone $this, 'eid' => $result));
    if ($result !== false) {
        // Refresh versionable assets cache
        Factory::getApplication()->flushAssets();
        return true;
    }
    return false;
}