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<?php |
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/* |
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* This file is part of the bisarca/graph package. |
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* |
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* (c) Emanuele Minotto <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace Bisarca\Graph\Graph\Descriptor; |
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use Bisarca\Graph\Edge\Set as EdgeSet; |
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use Bisarca\Graph\Vertex\Set as VertexSet; |
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use Bisarca\Graph\Vertex\VertexInterface; |
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trait DegreeTrait |
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{ |
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/** |
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* Gets the edges set. |
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* |
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* @return EdgeSet |
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*/ |
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abstract public function getEdgeSet(): EdgeSet; |
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/** |
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* Gets the vertices set. |
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* |
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* @return VertexSet |
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*/ |
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abstract public function getVertexSet(): VertexSet; |
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/** |
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* Gets vertex degree. |
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* |
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* @param VertexInterface $vertex |
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* |
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* @return int |
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*/ |
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public function getVertexDegree(VertexInterface $vertex): int |
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{ |
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return $this->getVertexInDegree($vertex) + $this->getVertexOutDegree($vertex); |
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} |
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/** |
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* Gets vertex in degree. |
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* |
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* @param VertexInterface $vertex |
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* |
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* @return int |
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*/ |
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public function getVertexInDegree(VertexInterface $vertex): int |
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{ |
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$counter = 0; |
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foreach ($this->getEdgeSet() as $edge) { |
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$counter += $edge->hasVertexEnd() && $vertex === $edge->getVertexEnd(); |
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} |
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return $counter; |
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} |
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/** |
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* Gets vertex out degree. |
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* |
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* @param VertexInterface $vertex |
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* |
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* @return int |
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*/ |
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public function getVertexOutDegree(VertexInterface $vertex): int |
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{ |
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$counter = 0; |
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foreach ($this->getEdgeSet() as $edge) { |
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$counter += $edge->hasVertexStart() && $vertex === $edge->getVertexStart(); |
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} |
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return $counter; |
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} |
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/** |
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* Gets maximum degree. |
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* |
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* @return int |
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*/ |
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public function getMaxDegree(): int |
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{ |
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$maximum = 0; |
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foreach ($this->getVertexSet() as $vertex) { |
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$maximum = max($maximum, $this->getVertexDegree($vertex)); |
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} |
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return $maximum; |
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} |
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/** |
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* Gets minimum degree. |
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* |
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* @return int |
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*/ |
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public function getMinDegree(): int |
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{ |
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$minimum = PHP_INT_MAX; |
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foreach ($this->getVertexSet() as $vertex) { |
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$minimum = min($minimum, $this->getVertexDegree($vertex)); |
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} |
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return $minimum; |
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} |
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/** |
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* Checks if vertex is isolated. |
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* |
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* @param VertexInterface $vertex |
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* |
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* @return bool |
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*/ |
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public function isIsolatedVertex(VertexInterface $vertex): bool |
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{ |
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return 0 === $this->getVertexDegree($vertex); |
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} |
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/** |
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* Checks if vertex is a leaf. |
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* |
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* @param VertexInterface $vertex |
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* |
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* @return bool |
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*/ |
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public function isLeafVertex(VertexInterface $vertex): bool |
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{ |
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return 1 === $this->getVertexDegree($vertex); |
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} |
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/** |
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* Checks if vertex is dominating. |
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* |
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* @param VertexInterface $vertex |
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* |
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* @return bool |
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*/ |
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public function isDominatingVertex(VertexInterface $vertex): bool |
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{ |
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return (count($this->getVertexSet()) - 1) === $this->getVertexDegree($vertex); |
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} |
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} |
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bisarca /
graph
