CelerityResourceGraph.php
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	<?php

	/*
	* Copyright 2012 Facebook, Inc.
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	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;
	}
	}