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<?php |
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namespace Graphp\Path; |
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use ArrayObject; |
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use Graphp\GraphUtils; |
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use Graphp\GraphInterface; |
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use Graphp\GraphPathInterface; |
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use Graphp\Vertex\VertexInterface; |
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/** |
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* Class AbstractGraphPath |
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* |
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* @package Graphp\Path |
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*/ |
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abstract class AbstractGraphPath implements GraphPathInterface |
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{ |
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/** |
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* The graph over which the path is defined |
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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 start vertex in the path |
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* |
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* @var VertexInterface |
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*/ |
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protected $startVertex; |
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/** |
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* The end vertex in the path |
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* |
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* @var VertexInterface |
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*/ |
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protected $endVertex; |
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/** |
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* The weight of the path |
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* |
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* @var float |
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*/ |
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protected $weight; |
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/** |
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* Get the graph over which the path 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 start vertex in the path |
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* |
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* @return VertexInterface |
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*/ |
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public function getStartVertex(): VertexInterface |
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{ |
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return $this->startVertex; |
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} |
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/** |
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* Get the end vertex in the path |
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* |
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* @return VertexInterface |
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*/ |
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public function getEndVertex(): VertexInterface |
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{ |
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return $this->endVertex; |
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} |
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/** |
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* Get the edges making up the path |
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* |
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* @return array |
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*/ |
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public function getEdgeList(): array |
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{ |
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$vertexList = $this->getVertexList(); |
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if (count($vertexList) < 2) { |
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return []; |
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} |
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$graph = $this->getGraph(); |
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$edgeList = []; |
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$vertexIterator = (new ArrayObject($vertexList))->getIterator(); |
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$sourceVertex = $vertexIterator->current(); |
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$vertexIterator->next(); |
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while ($vertexIterator->valid()) { |
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$targetVertex = $vertexIterator->current(); |
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$edgeList[] = $graph->getEdge($sourceVertex, $targetVertex); |
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$sourceVertex = $targetVertex; |
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$vertexIterator->next(); |
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$sourceVertex = $targetVertex; |
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} |
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return $edgeList; |
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} |
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/** |
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* Get the vertices making up the path |
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* |
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* @return array |
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*/ |
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public function getVertexList(): array |
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{ |
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$edgeList = $this->getEdgeList(); |
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if (empty($edgeList)) { |
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$startVertex = $this->getStartVertex(); |
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if (!is_null($startVertex) && $startVertex->equals($this->getEndVertex())) { |
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return [$startVertex]; |
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} |
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return []; |
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} |
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$graph = $this->getGraph(); |
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$vertexList = []; |
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$vertex = $this->getStartVertex(); |
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$vertexList[] = $vertex; |
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foreach ($edgeList as $edge) { |
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$vertex = GraphUtils::getOppositeVertex($graph, $edge, $vertex); |
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$vertexList[] = $vertex; |
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} |
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return $vertexList; |
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} |
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/** |
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* Get the weight of the path, which is typically the sum of the weights of the edges |
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* |
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* @return float |
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*/ |
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public function getWeight(): float |
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{ |
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return $this->weight; |
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} |
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/** |
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* Set the weight of the path |
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* |
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* @param float $weight - the weight of the path |
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*/ |
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public function setWeight(float $weight): void |
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{ |
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$this->weight = $weight; |
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} |
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/** |
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* Get the length of the path, measured in the number of edges |
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* |
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* @return int |
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*/ |
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public function getLength(): int |
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{ |
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return count($this->getEdgeList()); |
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} |
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} |
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bingo-soft /
graphp
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