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<?php |
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namespace Hexogen\KDTree; |
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class FSNode implements NodeInterface |
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{ |
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/** |
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* @var ItemInterface item that belongs to the node |
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*/ |
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private $item; |
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/** |
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* @var NodeInterface|null link to the left node |
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*/ |
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private $left; |
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/** |
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* @var int left node offset in file |
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*/ |
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private $leftPosition; |
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/** |
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* @var NodeInterface|null right node link |
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*/ |
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private $right; |
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/** |
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* @var int right node offset in the file |
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*/ |
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private $rightPosition; |
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/** |
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* @var resource file handler |
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*/ |
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private $handler; |
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/** |
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* @var int node start position in the file |
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*/ |
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private $position; |
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/** |
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* @var ItemFactoryInterface item factory |
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*/ |
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private $factory; |
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/** |
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* @var int num of dimensions it item |
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*/ |
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private $dimensions; |
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/** |
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* FSNode constructor. |
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* @param ItemFactoryInterface $factory |
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* @param resource $handler file handler |
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* @param int $position node start position in the file |
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* @param int $dimensions number of dimensions in item |
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*/ |
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public function __construct(ItemFactoryInterface $factory, $handler, int $position, int $dimensions) |
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{ |
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$this->item = null; |
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$this->left = null; |
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$this->right = null; |
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$this->handler = $handler; |
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$this->position = $position; |
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$this->factory = $factory; |
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$this->dimensions = $dimensions; |
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} |
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/** |
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* @return ItemInterface get item from the node |
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*/ |
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public function getItem() : ItemInterface |
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{ |
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if ($this->item == null) { |
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$this->readNode(); |
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} |
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return $this->item; |
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} |
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/** |
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* @param NodeInterface $node set right node |
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*/ |
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public function setRight(NodeInterface $node) |
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{ |
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$this->right = $node; |
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} |
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/** |
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* @param NodeInterface $node set left node |
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*/ |
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public function setLeft(NodeInterface $node) |
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{ |
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$this->left = $node; |
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} |
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/** |
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* Returns right node if it exists, null otherwise |
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* @return NodeInterface|null get right node |
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*/ |
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public function getRight() |
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{ |
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if ($this->rightPosition === null) { |
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$this->readNode(); |
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} |
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if ($this->right === null && $this->rightPosition !== 0) { |
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$rightNode = new FSNode($this->factory, $this->handler, $this->rightPosition, $this->dimensions); |
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$this->setRight($rightNode); |
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} |
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return $this->right; |
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} |
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/** |
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* Returns left node if it exists, null otherwise |
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* @return NodeInterface|null left node |
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*/ |
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public function getLeft() |
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{ |
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if ($this->leftPosition === null) { |
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$this->readNode(); |
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} |
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if ($this->left === null && $this->leftPosition !== 0) { |
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$leftNode = new FSNode($this->factory, $this->handler, $this->leftPosition, $this->dimensions); |
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$this->setLeft($leftNode); |
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} |
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return $this->left; |
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} |
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/** |
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* Read node data from the file |
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*/ |
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private function readNode() |
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{ |
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fseek($this->handler, $this->position); |
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$dataLength = 8 * $this->dimensions; |
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$binData = fread($this->handler, 4); |
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$itemId = unpack('V', $binData)[1]; |
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$binData = fread($this->handler, 4); |
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$this->leftPosition = unpack('V', $binData)[1]; |
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$binData = fread($this->handler, 4); |
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$this->rightPosition = unpack('V', $binData)[1]; |
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$binData = fread($this->handler, $dataLength); |
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$dValues = unpack('d'.$this->dimensions, $binData); |
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$dValues = array_values($dValues); |
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$this->item = $this->factory->make($itemId, $dValues); |
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} |
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} |
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hexogen /
kdtree
