--- /dev/null
+<?php
+
+namespace Drupal\comment\Plugin\views\argument;
+
+use Drupal\Core\Database\Connection;
+use Drupal\views\Plugin\views\argument\ArgumentPluginBase;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Argument handler to accept a user id to check for nodes that
+ * user posted or commented on.
+ *
+ * @ingroup views_argument_handlers
+ *
+ * @ViewsArgument("argument_comment_user_uid")
+ */
+class UserUid extends ArgumentPluginBase {
+
+ /**
+ * Database Service Object.
+ *
+ * @var \Drupal\Core\Database\Connection
+ */
+ protected $database;
+
+ /**
+ * Constructs a Drupal\Component\Plugin\PluginBase object.
+ *
+ * @param array $configuration
+ * A configuration array containing information about the plugin instance.
+ * @param string $plugin_id
+ * The plugin_id for the plugin instance.
+ * @param mixed $plugin_definition
+ * The plugin implementation definition.
+ * @param \Drupal\Core\Database\Connection $database
+ * Database Service Object.
+ */
+ public function __construct(array $configuration, $plugin_id, $plugin_definition, Connection $database) {
+ parent::__construct($configuration, $plugin_id, $plugin_definition);
+
+ $this->database = $database;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
+ return new static($configuration, $plugin_id, $plugin_definition, $container->get('database'));
+ }
+
+ public function title() {
+ if (!$this->argument) {
+ $title = \Drupal::config('user.settings')->get('anonymous');
+ }
+ else {
+ $title = $this->database->query('SELECT name FROM {users_field_data} WHERE uid = :uid AND default_langcode = 1', [':uid' => $this->argument])->fetchField();
+ }
+ if (empty($title)) {
+ return $this->t('No user');
+ }
+
+ return $title;
+ }
+
+ protected function defaultActions($which = NULL) {
+ // Disallow summary views on this argument.
+ if (!$which) {
+ $actions = parent::defaultActions();
+ unset($actions['summary asc']);
+ unset($actions['summary desc']);
+ return $actions;
+ }
+
+ if ($which != 'summary asc' && $which != 'summary desc') {
+ return parent::defaultActions($which);
+ }
+ }
+
+ public function query($group_by = FALSE) {
+ $this->ensureMyTable();
+
+ // Use the table definition to correctly add this user ID condition.
+ if ($this->table != 'comment_field_data') {
+ $subselect = $this->database->select('comment_field_data', 'c');
+ $subselect->addField('c', 'cid');
+ $subselect->condition('c.uid', $this->argument);
+
+ $entity_id = $this->definition['entity_id'];
+ $entity_type = $this->definition['entity_type'];
+ $subselect->where("c.entity_id = $this->tableAlias.$entity_id");
+ $subselect->condition('c.entity_type', $entity_type);
+
+ $condition = db_or()
+ ->condition("$this->tableAlias.uid", $this->argument, '=')
+ ->exists($subselect);
+
+ $this->query->addWhere(0, $condition);
+ }
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getSortName() {
+ return $this->t('Numerical', [], ['context' => 'Sort order']);
+ }
+
+}