testing

DifferentialViewPolicyFieldSpecification.php
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			<?php

			final class DifferentialViewPolicyFieldSpecification
			extends DifferentialFieldSpecification {

			private $value;

			public function shouldAppearOnEdit() {
			return true;
			}

			protected function didSetRevision() {
			$this->value = $this->getRevision()->getViewPolicy();
			}

			public function setValueFromRequest(AphrontRequest $request) {
			$this->value = $request->getStr('viewPolicy');
			return $this;
			}

			public function renderEditControl() {
			$viewer = $this->getUser();
			$revision = $this->getRevision();

			$policies = id(new PhabricatorPolicyQuery())
			->setViewer($viewer)
			->setObject($revision)
			->execute();

			return id(new AphrontFormPolicyControl())
			->setUser($viewer)
			->setCapability(PhabricatorPolicyCapability::CAN_VIEW)
			->setPolicyObject($revision)
			->setPolicies($policies)
			->setName('viewPolicy');
			}

			public function willWriteRevision(DifferentialRevisionEditor $editor) {
			$this->getRevision()->setViewPolicy($this->value);
			}

			}