PhabricatorBoardLayoutEngine.php
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	<?php

	final class PhabricatorBoardLayoutEngine extends Phobject {

	private $viewer;
	private $boardPHIDs;
	private $objectPHIDs;
	private $boards;
	private $columnMap;
	private $objectColumnMap = array();
	private $boardLayout = array();

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

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

	public function setBoardPHIDs(array $board_phids) {
	$this->boardPHIDs = $board_phids;
	return $this;
	}

	public function getBoardPHIDs() {
	return $this->boardPHIDs;
	}

	public function setObjectPHIDs(array $object_phids) {
	$this->objectPHIDs = $object_phids;
	return $this;
	}

	public function getObjectPHIDs() {
	return $this->objectPHIDs;
	}

	public function executeLayout() {
	$viewer = $this->getViewer();

	$boards = $this->loadBoards();
	if (!$boards) {
	return $this;
	}

	$columns = $this->loadColumns($boards);
	$positions = $this->loadPositions($boards);

	foreach ($boards as $board_phid => $board) {
	$board_columns = idx($columns, $board_phid);

	// Don't layout boards with no columns. These boards need to be formally
	// created first.
	if (!$columns) {
	continue;
	}

	$board_positions = idx($positions, $board_phid, array());

	$this->layoutBoard($board, $board_columns, $board_positions);
	}

	return $this;
	}

	public function getObjectColumns($board_phid, $object_phid) {
	$board_map = idx($this->objectColumnMap, $board_phid, array());

	$column_phids = idx($board_map, $object_phid);
	if (!$column_phids) {
	return array();
	}

	return array_select_keys($this->columnMap, $column_phids);
	}

	private function loadBoards() {
	$viewer = $this->getViewer();
	$board_phids = $this->getBoardPHIDs();

	$boards = id(new PhabricatorObjectQuery())
	->setViewer($viewer)
	->withPHIDs($board_phids)
	->execute();
	$boards = mpull($boards, null, 'getPHID');

	foreach ($boards as $key => $board) {
	if (!$board->getHasWorkboard()) {
	unset($boards[$key]);
	}
	}

	return $boards;
	}

	private function loadColumns(array $boards) {
	$viewer = $this->getViewer();

	$columns = id(new PhabricatorProjectColumnQuery())
	->setViewer($viewer)
	->withProjectPHIDs(array_keys($boards))
	->execute();
	$columns = msort($columns, 'getSequence');
	$columns = mpull($columns, null, 'getPHID');

	$this->columnMap = $columns;
	$columns = mgroup($columns, 'getProjectPHID');

	return $columns;
	}

	private function loadPositions(array $boards) {
	$viewer = $this->getViewer();

	$positions = id(new PhabricatorProjectColumnPositionQuery())
	->setViewer($viewer)
	->withBoardPHIDs(array_keys($boards))
	->withObjectPHIDs($this->getObjectPHIDs())
	->execute();
	$positions = msort($positions, 'getOrderingKey');
	$positions = mgroup($positions, 'getBoardPHID');

	return $positions;
	}

	private function layoutBoard(
	$board,
	array $columns,
	array $positions) {

	$board_phid = $board->getPHID();
	$position_groups = mgroup($positions, 'getObjectPHID');

	foreach ($columns as $column) {
	if ($column->isDefaultColumn()) {
	$default_phid = $column->getPHID();
	break;
	}
	}

	$layout = array();

	$object_phids = $this->getObjectPHIDs();
	foreach ($object_phids as $object_phid) {
	$positions = idx($position_groups, $object_phid, array());

	// Remove any positions in columns which no longer exist.
	foreach ($positions as $key => $position) {
	$column_phid = $position->getColumnPHID();
	if (empty($columns[$column_phid])) {
	unset($positions[$key]);
	}
	}

	// If the object has no position, put it on the default column.
	if (!$positions) {
	$new_position = id(new PhabricatorProjectColumnPosition())
	->setBoardPHID($board_phid)
	->setColumnPHID($default_phid)
	->setObjectPHID($object_phid)
	->setSequence(0);
	$positions = array(
	$new_position,
	);
	}

	foreach ($positions as $position) {
	$column_phid = $position->getColumnPHID();
	$layout[$column_phid][$object_phid] = $position;
	}
	}

	foreach ($layout as $column_phid => $map) {
	$map = msort($map, 'getOrderingKey');
	$layout[$column_phid] = $map;

	foreach ($map as $object_phid => $position) {
	$this->objectColumnMap[$board_phid][$object_phid][] = $column_phid;
	}
	}

	$this->boardLayout[$board_phid] = $layout;
	}

	}

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