testing

DifferentialViewPolicyField.php
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			<?php

			final class DifferentialViewPolicyField
			extends DifferentialCoreCustomField {

			public function getFieldKey() {
			return 'differential:view-policy';
			}

			public function getFieldName() {
			return pht('View Policy');
			}

			public function getFieldDescription() {
			return pht('Controls visibility.');
			}

			protected function readValueFromRevision(
			DifferentialRevision $revision) {
			return $revision->getViewPolicy();
			}

			public function readValueFromRequest(AphrontRequest $request) {
			$this->setValue($request->getStr($this->getFieldKey()));
			}

			public function renderEditControl(array $handles) {
			$viewer = $this->getViewer();
			$revision = $this->getObject();

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

			return id(new AphrontFormPolicyControl())
			->setUser($viewer)
			->setCapability(PhabricatorPolicyCapability::CAN_VIEW)
			->setPolicyObject($revision)
			->setPolicies($policies)
			->setName($this->getFieldKey())
			->setValue($this->getValue())
			->setError($this->getFieldError());
			}

			public function getApplicationTransactionType() {
			return PhabricatorTransactions::TYPE_VIEW_POLICY;
			}

			}