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PhabricatorCalendarICSWriter.php
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			<?php

			final class PhabricatorCalendarICSWriter extends Phobject {

			private $viewer;
			private $events = array();

			public function setViewer(PhabricatorUser $viewer) {
			$this->viewer = $viewer;
			return $this;
			}

			public function getViewer() {
			return $this->viewer;
			}

			public function setEvents(array $events) {
			assert_instances_of($events, 'PhabricatorCalendarEvent');
			$this->events = $events;
			return $this;
			}

			public function getEvents() {
			return $this->events;
			}

			public function writeICSDocument() {
			$viewer = $this->getViewer();
			$events = $this->getEvents();

			$events = mpull($events, null, 'getPHID');

			if ($events) {
			$child_map = id(new PhabricatorCalendarEventQuery())
			->setViewer($viewer)
			->withParentEventPHIDs(array_keys($events))
			->execute();
			$child_map = mpull($child_map, null, 'getPHID');
			} else {
			$child_map = array();
			}

			$all_events = $events + $child_map;
			$child_groups = mgroup($child_map, 'getInstanceOfEventPHID');

			$document_node = new PhutilCalendarDocumentNode();

			foreach ($all_events as $event) {
			$child_events = idx($child_groups, $event->getPHID(), array());
			$event_node = $event->newIntermediateEventNode($viewer, $child_events);
			$document_node->appendChild($event_node);
			}

			$root_node = id(new PhutilCalendarRootNode())
			->appendChild($document_node);

			return id(new PhutilICSWriter())
			->writeICSDocument($root_node);
			}
			}