CelerityResourceGraph.php
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			<?php

			final class CelerityResourceGraph extends AbstractDirectedGraph {

			private $resourceGraph = array();
			private $graphSet = false;

			protected function loadEdges(array $nodes) {
			if (!$this->graphSet) {
			throw new PhutilInvalidStateException('setResourceGraph');
			}

			$graph = $this->getResourceGraph();
			$edges = array();
			foreach ($nodes as $node) {
			$edges[$node] = idx($graph, $node, array());
			}
			return $edges;
			}

			public function setResourceGraph(array $graph) {
			$this->resourceGraph = $graph;
			$this->graphSet = true;
			return $this;
			}

			private function getResourceGraph() {
			return $this->resourceGraph;
			}
			}

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