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DifferentialProjectReviewersField.php
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			<?php

			final class DifferentialProjectReviewersField
			extends DifferentialCustomField {

			public function getFieldKey() {
			return 'differential:project-reviewers';
			}

			public function getFieldName() {
			return pht('Group Reviewers');
			}

			public function getFieldDescription() {
			return pht('Display project reviewers.');
			}

			public function shouldAppearInPropertyView() {
			return true;
			}

			public function canDisableField() {
			return false;
			}

			public function renderPropertyViewLabel() {
			return $this->getFieldName();
			}

			public function getRequiredHandlePHIDsForPropertyView() {
			return mpull($this->getProjectReviewers(), 'getReviewerPHID');
			}

			public function renderPropertyViewValue(array $handles) {
			$reviewers = $this->getProjectReviewers();
			if (!$reviewers) {
			return null;
			}

			$view = id(new DifferentialReviewersView())
			->setUser($this->getViewer())
			->setReviewers($reviewers)
			->setHandles($handles);

			$diff = $this->getActiveDiff();
			if ($diff) {
			$view->setActiveDiff($diff);
			}

			return $view;
			}

			private function getProjectReviewers() {
			$reviewers = array();
			foreach ($this->getObject()->getReviewers() as $reviewer) {
			if (!$reviewer->isUser()) {
			$reviewers[] = $reviewer;
			}
			}
			return $reviewers;
			}

			}