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<?php |
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namespace Graphp\Alg\Shortestpath; |
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use Graphp\GraphInterface; |
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use Graphp\GraphPathInterface; |
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use Graphp\GraphUtils; |
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use Graphp\Vertex\VertexInterface; |
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use Graphp\Path\GraphWalk; |
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use Graphp\Alg\Interfaces\SingleSourcePathsInterface; |
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/** |
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* Class ListSingleSourcePaths |
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* |
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* @package Graphp\Alg\Shortestpath |
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*/ |
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class ListSingleSourcePaths implements SingleSourcePathsInterface |
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{ |
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/** |
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* The graph |
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* |
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* @var GraphInterface |
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*/ |
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protected $graph; |
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/** |
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* The source vertex |
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* |
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* @var VertexInterface |
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*/ |
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protected $source; |
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/** |
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* One path per vertex |
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* |
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* @var array |
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*/ |
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protected $paths = []; |
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/** |
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* Construct a new instance |
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* |
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* @param GraphInterface $graph - the graph |
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* @param VertexInterface $source - the source vertex |
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* @param array $paths - one path per target vertex |
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*/ |
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public function __construct(GraphInterface $graph, VertexInterface $source, array $paths = []) |
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{ |
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$this->graph = $graph; |
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$this->source = $source; |
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$this->paths = $paths; |
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} |
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/** |
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* Get the graph over which this set of paths is defined |
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* |
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* @return GraphInterface |
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*/ |
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public function getGraph(): GraphInterface |
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{ |
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return $this->graph; |
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} |
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/** |
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* Get the single source vertex |
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* |
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* @return GraphInterface |
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*/ |
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public function getSourceVertex(): VertexInterface |
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{ |
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return $this->source; |
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} |
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/** |
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* Get the weight of the path from the source vertex to the target vertex |
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* |
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* @param VertexInterface $targetVertex - the target vertex |
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* |
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* @return float |
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*/ |
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public function getWeight(VertexInterface $targetVertex): float |
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{ |
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$id = $targetVertex->getHash(); |
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if (!array_key_exists($id, $this->paths)) { |
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if ($this->source->equals($targetVertex)) { |
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return 0.0; |
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} |
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return INF; |
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} |
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return $this->paths[$id]->getWeight(); |
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} |
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/** |
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* Get the path from the source vertex to the target vertex |
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* |
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* @param VertexInterface $targetVertex - the target vertex |
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* |
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* @return null|GraphPathInterface |
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*/ |
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public function getPath(VertexInterface $targetVertex): ?GraphPathInterface |
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{ |
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$id = $targetVertex->getHash(); |
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if (!array_key_exists($id, $this->paths)) { |
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if ($this->source->equals($targetVertex)) { |
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return GraphWalk::singletonWalk($this->graph, $source, 0.0); |
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} |
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return null; |
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} |
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return $this->paths[$id]; |
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} |
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} |
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bingo-soft /
graphp
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