+ return '(' . implode(') OR (', $cond) . ')';
+ }
+}
+
+abstract class UFC_UserRelated implements UserFilterCondition
+{
+ protected $user;
+ public function __construct(PlUser &$user)
+ {
+ $this->user =& $user;
+ }
+}
+
+class UFC_Contact extends UFC_UserRelated
+{
+ public function buildCondition(UserFilter &$uf)
+ {
+ $sub = $uf->addContactFilter($this->user->id());
+ return 'c' . $sub . '.contact IS NOT NULL';
+ }
+}
+
+class UFC_WatchRegistration extends UFC_UserRelated
+{
+ public function buildCondition(UserFilter &$uf)
+ {
+ if (!$this->user->watch('registration')) {
+ return UserFilterCondition::COND_FALSE;
+ }
+ $uids = $this->user->watchUsers();
+ if (count($uids) == 0) {
+ return UserFilterCondition::COND_FALSE;
+ } else {
+ return '$UID IN ' . XDB::formatArray($uids);
+ }
+ }
+}
+
+class UFC_WatchPromo extends UFC_UserRelated
+{
+ private $grade;
+ public function __construct(PlUser &$user, $grade = UserFilter::GRADE_ING)
+ {
+ parent::__construct($user);
+ $this->grade = $grade;
+ }
+
+ public function buildCondition(UserFilter &$uf)
+ {
+ $promos = $this->user->watchPromos();
+ if (count($promos) == 0) {
+ return UserFilterCondition::COND_FALSE;
+ } else {
+ $sube = $uf->addEducationFilter(true, $this->grade);
+ $field = 'pe' . $sube . '.' . UserFilter::promoYear($this->grade);
+ return $field . ' IN ' . XDB::formatArray($promos);
+ }
+ }
+}
+
+class UFC_WatchContact extends UFC_Contact
+{
+ public function buildCondition(UserFilter &$uf)
+ {
+ if (!$this->user->watchContacts()) {
+ return UserFilterCondition::COND_FALSE;
+ }
+ return parent::buildCondition($uf);