DifferentialStackGraph.php
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	<?php

	final class DifferentialStackGraph
	extends AbstractDirectedGraph {

	private $parentEdges = array();
	private $childEdges = array();

	public function setSeedRevision(DifferentialRevision $revision) {
	return $this->addNodes(
	array(
	'<seed>' => array($revision->getPHID()),
	));
	}

	public function isEmpty() {
	return (count($this->getNodes()) <= 2);
	}

	public function getParentEdges() {
	return $this->parentEdges;
	}

	protected function loadEdges(array $nodes) {
	$query = id(new PhabricatorEdgeQuery())
	->withSourcePHIDs($nodes)
	->withEdgeTypes(
	array(
	DifferentialRevisionDependsOnRevisionEdgeType::EDGECONST,
	DifferentialRevisionDependedOnByRevisionEdgeType::EDGECONST,
	));

	$query->execute();

	$map = array();
	foreach ($nodes as $node) {
	$parents = $query->getDestinationPHIDs(
	array($node),
	array(
	DifferentialRevisionDependsOnRevisionEdgeType::EDGECONST,
	));

	$children = $query->getDestinationPHIDs(
	array($node),
	array(
	DifferentialRevisionDependedOnByRevisionEdgeType::EDGECONST,
	));

	$this->parentEdges[$node] = $parents;
	$this->childEdges[$node] = $children;

	$map[$node] = array_values(array_fuse($parents) + array_fuse($children));
	}

	return $map;
	}

	}