PhutilDirectedScalarGraph.php
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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));
			}

			}