CelerityResourceGraph.php
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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;
			}
			}