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<?php |
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namespace PHPAlgorithms\GraphTools\Graph; |
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use PHPAlgorithms\GraphTools\Abstracts\BuilderAbstract; |
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use PHPAlgorithms\GraphTools\Graph; |
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/** |
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* Class Builder |
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* @package PHPAlgorithms\GraphTools\Graph |
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* @method Connection[] getConnections() |
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* @method Node[] getNodes() |
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* @property-read Connection[] $connections |
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* @property-read Node[] $nodes |
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*/ |
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class Builder extends BuilderAbstract |
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{ |
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private const OPERATION_ADD_CONNECTION = 2; |
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private const OPERATION_ADD_NODE = 1; |
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private const OPERATION_NO_OPERATION = 0; |
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/** |
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* @var array $allowedGet |
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*/ |
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protected $allowedGet = array('connections', 'nodes'); |
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/** |
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* @var Connection[] $connections |
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*/ |
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protected $connections = array(); |
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/** |
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* @var Connection|null $lastConnection |
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*/ |
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private $lastConnection = null; |
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/** |
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* @var integer $lastOperation |
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*/ |
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private $lastOperation = self::OPERATION_NO_OPERATION; |
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/** |
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* @var Node[] $nodes |
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*/ |
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protected $nodes = array(); |
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/** |
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* @param Connection $connection |
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* @return Builder |
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*/ |
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public function addConnection(Connection $connection) : Builder |
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{ |
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try { |
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$this->addNode($connection->from); |
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} catch (Builder\Exception $exception) { |
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} |
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try { |
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$this->addNode($connection->to); |
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} catch (Builder\Exception $exception) { |
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} |
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$this->connections[] = $connection; |
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$this->lastOperation = self::OPERATION_ADD_CONNECTION; |
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$this->lastConnection = $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 Builder |
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* @throws Builder\Exception |
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*/ |
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public function addNode(Node $node) : Builder |
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{ |
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if (in_array($node, $this->nodes, true)) { |
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throw new Builder\Exception('Node was added before'); |
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} |
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$this->nodes[] = $node; |
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$this->lastOperation = self::OPERATION_ADD_NODE; |
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return $this; |
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} |
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/** |
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* @return Graph |
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*/ |
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public function build() : Graph |
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{ |
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return new Graph($this->nodes, $this->connections); |
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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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* @param float|null $weight |
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* @return Builder |
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*/ |
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public function connect(Node $from, Node $to, float $weight = null) : Builder |
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{ |
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$this->addConnection(new Connection($from, $to, $weight)); |
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return $this; |
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} |
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/** |
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* @return Node\Builder |
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*/ |
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public function createNode() : Node\Builder |
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{ |
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return new Node\Builder($this); |
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} |
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/** |
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* @return Connection\Builder |
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*/ |
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public function createConnection() : Connection\Builder |
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{ |
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return new Connection\Builder($this); |
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} |
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/** |
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* @param integer $index |
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* @return Node |
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*/ |
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public function getNode(int $index) : Node |
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{ |
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return $this->nodes[$index]; |
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} |
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/** |
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* @return Builder |
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* @throws Builder\Exception |
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*/ |
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public function viceVersa() : Builder |
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{ |
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if (($this->lastOperation !== self::OPERATION_ADD_CONNECTION) || is_null($this->lastConnection)) { |
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throw new Builder\Exception('To which connection, hm?'); |
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} |
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$lastConnection = $this->lastConnection; |
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$this->addConnection(new Connection($lastConnection->to, $lastConnection->from, $lastConnection->weight)); |
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$this->lastOperation = self::OPERATION_NO_OPERATION; |
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$this->lastConnection = null; |
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return $this; |
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} |
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} |
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PHPAlgorithms /
GraphTools
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