PhabricatorEdgeGraph.php
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	<?php

	final class PhabricatorEdgeGraph extends AbstractDirectedGraph {

	private $edgeType;

	public function setEdgeType($edge_type) {
	$this->edgeType = $edge_type;
	return $this;
	}

	protected function loadEdges(array $nodes) {
	if (!$this->edgeType) {
	throw new Exception('Set edge type before loading graph!');
	}

	$edges = id(new PhabricatorEdgeQuery())
	->withSourcePHIDs($nodes)
	->withEdgeTypes(array($this->edgeType))
	->execute();

	$results = array_fill_keys($nodes, array());
	foreach ($edges as $src => $types) {
	foreach ($types as $type => $dsts) {
	foreach ($dsts as $dst => $edge) {
	$results[$src][] = $dst;
	}
	}
	}

	return $results;
	}

	}