PhutilDirectedScalarGraph.php
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	<?php

	/**
	* Concrete subclass of @{class:AbstractDirectedGraph} which can not load any
	* data from external sources.
	*/
	final class PhutilDirectedScalarGraph extends AbstractDirectedGraph {

	protected function loadEdges(array $nodes) {
	throw new Exception(
	'PhutilDirectedScalarGraph can not load additional nodes at runtime. '.
	'Tried to load: '.implode(', ', $nodes));
	}

	}