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<?php |
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namespace PHPAlgorithms\GraphTools; |
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use PHPAlgorithms\GraphTools\Abstracts\BuildableAbstract; |
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use PHPAlgorithms\GraphTools\Graph\Connection; |
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use PHPAlgorithms\GraphTools\Graph\Node; |
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/** |
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* Class Graph |
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* @package PHPAlgorithms\GraphTools |
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* @method Node[] getNodes() |
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* @property-read Node[] $nodes |
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*/ |
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class Graph extends BuildableAbstract |
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{ |
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/** |
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* @var string[] $allowedGet |
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*/ |
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protected $allowedGet = array('nodes'); |
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/** |
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* @var Connection[] $connections |
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*/ |
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protected $connections; |
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/** |
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* @var Node[] $nodes |
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*/ |
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protected $nodes; |
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/** |
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* Graph constructor. |
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* @param Node[] $nodes |
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* @param Connection[] $connections |
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*/ |
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public function __construct(array $nodes, array $connections) |
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{ |
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foreach ($nodes as $node) { |
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$this->addNode($node); |
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} |
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foreach ($connections as $connection) { |
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$this->addConnection($connection); |
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} |
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} |
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/** |
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* @param Connection $connection |
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* @return Graph |
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*/ |
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protected function addConnection(Connection $connection) : Graph |
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{ |
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$this->addNode($connection->from)->addNode($connection->to); |
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if (!isset($this->connections[$connection->from->id][$connection->to->id])) { |
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$this->connections[$connection->from->id][$connection->to->id] = array(); |
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} |
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$this->connections[$connection->from->id][$connection->to->id][] = $connection; |
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return $this; |
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} |
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/** |
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* @param Node $node |
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* @return Graph |
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*/ |
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protected function addNode(Node $node) : Graph |
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{ |
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if (!isset($this->nodes[$node->id])) { |
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$this->nodes[$node->id] = $node; |
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} |
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return $this; |
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} |
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/** |
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* @param Node $from |
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* @param Node $to |
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* @return Connection[] |
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*/ |
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public function getConnections(Node $from, Node $to) : array |
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{ |
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if (isset($this->connections[$from->id][$to->id])) { |
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return $this->connections[$from->id][$to->id]; |
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} |
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return array(); |
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} |
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/** |
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* @param Node $from |
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* @param Node $to |
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* @return (float|null)[] |
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*/ |
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public function getDistances(Node $from, Node $to) : array |
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{ |
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$distances = array(); |
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foreach ($this->getConnections($from, $to) as $connection) { |
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/** |
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* @var Connection $connection |
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*/ |
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$distances[] = $connection->getWeight(); |
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} |
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return $distances; |
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} |
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/** |
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* @param Node $from |
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* @param Node $to |
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* @return null|Connection |
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*/ |
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public function getNearestConnection(Node $from, Node $to) : ?Connection |
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{ |
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/** |
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* @var null|Connection $nearest |
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*/ |
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$nearest = null; |
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foreach ($this->getConnections($from, $to) as $connection) { |
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/** |
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* @var Connection $connection |
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*/ |
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if (is_null($nearest) || ($nearest->getWeight() > $connection->getWeight())) { |
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$nearest = $connection; |
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} |
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} |
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return $nearest; |
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} |
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/** |
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* @param Node $from |
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* @param Node $to |
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* @return null|float |
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*/ |
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public function getNearestDistance(Node $from, Node $to) : ?float |
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{ |
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$nearest = $this->getNearestConnection($from, $to); |
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if (is_null($nearest)) { |
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return null; |
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} |
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return $nearest->getWeight(); |
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} |
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/** |
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* @param Node $node |
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* @return Node[] |
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*/ |
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public function getNeighbour(Node $node) : array |
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{ |
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$neighbour = array(); |
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if (isset($this->connections[$node->id])) { |
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$ids = array_keys($this->connections[$node->id]); |
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foreach ($this->nodes as $node) { |
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if (in_array($node->id, $ids)) { |
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$neighbour[] = $node; |
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} |
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} |
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} |
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return $neighbour; |
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} |
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} |
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PHPAlgorithms /
GraphTools
