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ManiphestTaskAssignHeraldAction.php
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			<?php

			abstract class ManiphestTaskAssignHeraldAction
			extends HeraldAction {

			const DO_ASSIGN = 'do.assign';

			public function supportsObject($object) {
			return ($object instanceof ManiphestTask);
			}

			public function getActionGroupKey() {
			return HeraldApplicationActionGroup::ACTIONGROUPKEY;
			}

			protected function applyAssign(array $phids) {
			$adapter = $this->getAdapter();
			$object = $adapter->getObject();

			$current = array($object->getOwnerPHID());

			$allowed_types = array(
			PhabricatorPeopleUserPHIDType::TYPECONST,
			);

			if (head($phids) == PhabricatorPeopleNoOwnerDatasource::FUNCTION_TOKEN) {
			$phid = null;

			if ($object->getOwnerPHID() == null) {
			$this->logEffect(self::DO_STANDARD_NO_EFFECT);
			return;
			}
			} else {
			$targets = $this->loadStandardTargets($phids, $allowed_types, $current);
			if (!$targets) {
			return;
			}

			$phid = head_key($targets);
			}

			$xaction = $adapter->newTransaction()
			->setTransactionType(ManiphestTaskOwnerTransaction::TRANSACTIONTYPE)
			->setNewValue($phid);

			$adapter->queueTransaction($xaction);

			$this->logEffect(self::DO_ASSIGN, array($phid));
			}

			protected function getActionEffectMap() {
			return array(
			self::DO_ASSIGN => array(
			'icon' => 'fa-user',
			'color' => 'green',
			'name' => pht('Assigned Task'),
			),
			);
			}

			protected function renderActionEffectDescription($type, $data) {
			switch ($type) {
			case self::DO_ASSIGN:
			if (head($data) === null) {
			return pht('Unassigned task.');
			} else {
			return pht(
			'Assigned task to: %s.',
			$this->renderHandleList($data));
			}
			}
			}

			}