57 lines
1.7 KiB
PHP
57 lines
1.7 KiB
PHP
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<?php
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namespace Graphp\Algorithms\Search;
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use Graphp\Algorithms\BaseVertex;
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use Fhaculty\Graph\Exception\DomainException;
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use Fhaculty\Graph\Exception\InvalidArgumentException;
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use Fhaculty\Graph\Vertex;
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use Fhaculty\Graph\Set\Vertices;
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abstract class Base extends BaseVertex
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{
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const DIRECTION_FORWARD = 0;
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const DIRECTION_REVERSE = 1;
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const DIRECTION_BOTH = 2;
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private $direction = self::DIRECTION_FORWARD;
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/**
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* set direction in which to follow adjacent vertices
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*
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* @param int $direction
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* @return AlgorithmSearch $this (chainable)
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* @throws Exception
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* @see AlgorithmSearch::getVerticesAdjacent()
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*/
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public function setDirection($direction)
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{
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if ($direction !== self::DIRECTION_FORWARD && $direction !== self::DIRECTION_REVERSE && $direction !== self::DIRECTION_BOTH) {
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throw new InvalidArgumentException('Invalid direction given');
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}
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$this->direction = $direction;
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return $this;
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}
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protected function getVerticesAdjacent(Vertex $vertex)
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{
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if ($this->direction === self::DIRECTION_FORWARD) {
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return $vertex->getVerticesEdgeTo();
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} elseif ($this->direction === self::DIRECTION_REVERSE) {
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return $vertex->getVerticesEdgeFrom();
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} elseif ($this->direction === self::DIRECTION_BOTH) {
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return $vertex->getVerticesEdge();
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} else {
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throw new DomainException('Should not happen. Invalid direction setting');
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}
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}
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/**
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* get set of all Vertices that can be reached from start vertex
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*
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* @return Vertices
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*/
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abstract public function getVertices();
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}
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