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<?php |
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namespace Hexogen\KDTree; |
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use Hexogen\KDTree\Interfaces\ItemFactoryInterface; |
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use Hexogen\KDTree\Interfaces\KDTreeInterface; |
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use Hexogen\KDTree\Interfaces\NodeInterface; |
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class FSKDTree implements KDTreeInterface |
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{ |
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/** |
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* @const int integer size in bytes |
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*/ |
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const INT_LENGTH = 4; |
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/** |
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* @const int float size in bytes |
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*/ |
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const FLOAT_LENGTH = 8; |
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/** |
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* @var NodeInterface |
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*/ |
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private $root; |
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/** |
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* @var array |
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*/ |
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private $maxBoundary; |
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/** |
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* @var array |
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*/ |
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private $minBoundary; |
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/** |
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* @var int number of items in the tree |
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*/ |
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private $length; |
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/** |
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* @var int |
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*/ |
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private $dimensions; |
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/** |
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* @var |
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*/ |
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private $handler; |
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/** |
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* @var ItemFactoryInterface |
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*/ |
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private $factory; |
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/** |
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* FSKDTree constructor. |
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* @param $path |
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* @param ItemFactoryInterface $factory |
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*/ |
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public function __construct($path, ItemFactoryInterface $factory) |
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{ |
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$this->factory = $factory; |
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$this->handler = fopen($path, 'rb'); |
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$this->readInitData(); |
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} |
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/** |
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* FSKDTree destructor |
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*/ |
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public function __destruct() |
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{ |
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fclose($this->handler); |
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} |
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/** |
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* @return int |
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*/ |
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public function getItemCount(): int |
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{ |
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return $this->length; |
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} |
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/** |
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* @return NodeInterface |
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*/ |
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public function getRoot(): ?NodeInterface |
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{ |
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return $this->root; |
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} |
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/** |
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* @return array |
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*/ |
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public function getMinBoundary(): array |
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{ |
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return $this->minBoundary; |
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} |
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/** |
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* @return array |
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*/ |
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public function getMaxBoundary(): array |
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{ |
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return $this->maxBoundary; |
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} |
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/** |
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* @return int |
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*/ |
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public function getDimensionCount(): int |
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{ |
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return $this->dimensions; |
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} |
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/** |
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* Read binary data and convert it to an object |
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*/ |
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private function readInitData() |
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{ |
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$this->readDimensionsCount(); |
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$this->readItemsCount(); |
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$this->readUpperBound(); |
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$this->readLowerBound(); |
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$this->setRoot(); |
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} |
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/** |
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* read num of dimensions in array |
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*/ |
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private function readDimensionsCount() |
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{ |
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$binData = fread($this->handler, FSKDTree::INT_LENGTH); |
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$this->dimensions = unpack('V', $binData)[1]; |
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} |
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/** |
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* read number of items in the tree |
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*/ |
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private function readItemsCount() |
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{ |
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$binData = fread($this->handler, FSKDTree::INT_LENGTH); |
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$this->length = unpack('V', $binData)[1]; |
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} |
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/** |
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* read upper boundary point |
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*/ |
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private function readUpperBound() |
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{ |
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$this->maxBoundary = $this->readPoint(); |
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} |
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/** |
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* read lower boundary point |
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*/ |
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private function readLowerBound() |
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{ |
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$this->minBoundary = $this->readPoint(); |
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} |
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/** |
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* set tree root |
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*/ |
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private function setRoot() |
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{ |
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if ($this->length == 0) { |
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return; |
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} |
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$position = ftell($this->handler); |
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$this->root = new FSNode($this->factory, $this->handler, $position, $this->dimensions); |
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} |
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/** |
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* Read point |
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* @return array |
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*/ |
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private function readPoint(): array |
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{ |
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$dataLength = FSKDTree::FLOAT_LENGTH * $this->dimensions; |
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$binData = fread($this->handler, $dataLength); |
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$dValues = unpack('d' . $this->dimensions, $binData); |
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return array_values($dValues); |
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} |
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} |
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hexogen /
kdtree
