37 lines
960 B
PHP
37 lines
960 B
PHP
<?php
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namespace Graphp\Algorithms;
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use Graphp\Algorithms\BaseGraph;
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use Fhaculty\Graph\Exception\UnexpectedValueException;
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use Fhaculty\Graph\Graph;
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use Fhaculty\Graph\Edge\Base as Edge;
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use Fhaculty\Graph\Edge\Directed as EdgeDirected;
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class TransposeGraph extends BaseGraph
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{
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/**
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* create transpose graph
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*
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* @throws UnexpectedValueException if input graph has undirected edges
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* @return Graph
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* @uses Graph::createGraphCloneEdgeless()
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* @uses Graph::createEdgeClone()
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* @uses Graph::createEdgeCloneInverted()
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*/
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public function createGraph()
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{
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$newgraph = $this->graph->createGraphCloneEdgeless();
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foreach ($this->graph->getEdges() as $edge) {
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if (!($edge instanceof EdgeDirected)) {
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throw new UnexpectedValueException('Edge is undirected');
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}
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$newgraph->createEdgeCloneInverted($edge);
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}
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return $newgraph;
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}
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}
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