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 Exception(
	"Call setResourceGraph before loading the graph!"
	);
	}

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

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

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