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PhabricatorSubscriptionsEditor.php
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Tue, Jan 7, 23:23

PhabricatorSubscriptionsEditor.php
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<?php
/*
* Copyright 2012 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
final class PhabricatorSubscriptionsEditor {
private $object;
private $user;
private $explicitSubscribePHIDs = array();
private $implicitSubscribePHIDs = array();
private $unsubscribePHIDs = array();
public function setObject(PhabricatorSubscribableInterface $object) {
$this->object = $object;
return $this;
}
public function setUser(PhabricatorUser $user) {
$this->user = $user;
return $this;
}
/**
* Add explicit subscribers. These subscribers have explicitly subscribed
* (or been subscribed) to the object, and will be added even if they
* had previously unsubscribed.
*
* @param list<phid> List of PHIDs to explicitly subscribe.
* @return this
*/
public function subscribeExplicit(array $phids) {
$this->explicitSubscribePHIDs += array_fill_keys($phids, true);
return $this;
}
/**
* Add implicit subscribers. These subscribers have taken some action which
* implicitly subscribes them (e.g., adding a comment) but it will be
* suppressed if they've previously unsubscribed from the object.
*
* @param list<phid> List of PHIDs to implicitly subscribe.
* @return this
*/
public function subscribeImplicit(array $phids) {
$this->implicitSubscribePHIDs += array_fill_keys($phids, true);
return $this;
}
/**
* Unsubscribe PHIDs and mark them as unsubscribed, so implicit subscriptions
* will not resubscribe them.
*
* @param list<phid> List of PHIDs to unsubscribe.
* @return this
*/
public function unsubscribe(array $phids) {
$this->unsubscribePHIDs += array_fill_keys($phids, true);
return $this;
}
public function save() {
if (!$this->object) {
throw new Exception('Call setObject() before save()!');
}
if (!$this->user) {
throw new Exception('Call setUser() before save()!');
}
$src = $this->object->getPHID();
if ($this->implicitSubscribePHIDs) {
$unsub = PhabricatorEdgeQuery::loadDestinationPHIDs(
$src,
PhabricatorEdgeConfig::TYPE_OBJECT_HAS_UNSUBSCRIBER);
$unsub = array_fill_keys($unsub, true);
$this->implicitSubscribePHIDs = array_diff_key(
$this->implicitSubscribePHIDs,
$unsub);
}
$add = $this->implicitSubscribePHIDs + $this->explicitSubscribePHIDs;
$del = $this->unsubscribePHIDs;
// If a PHID is marked for both subscription and unsubscription, treat
// unsubscription as the stronger action.
$add = array_diff_key($add, $del);
if ($add || $del) {
$u_type = PhabricatorEdgeConfig::TYPE_OBJECT_HAS_UNSUBSCRIBER;
$s_type = PhabricatorEdgeConfig::TYPE_OBJECT_HAS_SUBSCRIBER;
$editor = id(new PhabricatorEdgeEditor())
->setUser($this->user);
foreach ($add as $phid => $ignored) {
$editor->removeEdge($src, $u_type, $phid);
$editor->addEdge($src, $s_type, $phid);
}
foreach ($del as $phid => $ignored) {
$editor->removeEdge($src, $s_type, $phid);
$editor->addEdge($src, $u_type, $phid);
}
$editor->save();
}
}
}

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