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<?php |
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namespace GeoTimeZone\Quadrant; |
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use ErrorException; |
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use GeoTimeZone\Geometry\Utils; |
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class Tree extends Element |
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{ |
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const DATA_TREE_FILENAME = "index.json"; |
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const GEO_FEATURE_FILENAME = "geo.json"; |
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const NONE_TIMEZONE = "none"; |
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protected $dataTree = null; |
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protected $dataDirectory; |
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protected $utils; |
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/** |
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* Tree constructor. |
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* @param $dataDirectory |
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*/ |
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public function __construct($dataDirectory=null) |
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{ |
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if (isset($dataDirectory) && is_dir($dataDirectory)) { |
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Element::__construct(); |
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$this->dataDirectory = $dataDirectory; |
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$this->utils = new Utils(); |
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}else{ |
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new ErrorException('Invalid data directory: ' . $dataDirectory); |
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} |
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} |
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/** |
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* Data tree is loaded from json file |
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*/ |
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public function initializeDataTree() |
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{ |
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$jsonData = file_get_contents($this->dataDirectory . self::DATA_TREE_FILENAME); |
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$this->dataTree = json_decode($jsonData, true); |
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} |
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/** |
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* Load json features data from a particular geo quadrant path |
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* @param $quadrantPath |
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* @return mixed |
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*/ |
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protected function loadFeatures($quadrantPath) |
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{ |
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$filePath = $this->dataDirectory . implode('/', str_split($quadrantPath)) . DIRECTORY_SEPARATOR . |
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self::GEO_FEATURE_FILENAME; |
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$geoJson = json_decode(file_get_contents($filePath), true); |
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return $geoJson; |
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} |
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/** |
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* Check if a particular location (latitude, longitude)is IN a particular quadrant |
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* @param $quadrantPath |
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* @param $latitude |
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* @param $longitude |
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* @return string |
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*/ |
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protected function evaluateFeatures($quadrantPath, $latitude, $longitude) |
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{ |
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$features = $this->loadFeatures($quadrantPath); |
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$timeZone = $this->utils->isPointInQuadrantFeatures($features, $latitude, $longitude); |
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return $timeZone; |
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} |
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/** |
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* Get valid timezone |
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* @param $zoneData |
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* @param $quadrantPath |
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* @param $latitude |
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* @param $longitude |
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* @return string |
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* @throws ErrorException |
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*/ |
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protected function evaluateQuadrantData($zoneData, $quadrantPath, $latitude, $longitude) |
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{ |
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$validTimezone = self::NONE_TIMEZONE; |
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if (!isset($zoneData)) { |
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throw new ErrorException('Unexpected data type'); |
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} elseif ($zoneData === "f") { |
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$validTimezone = $this->evaluateFeatures($quadrantPath, $latitude, $longitude); |
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} elseif (is_numeric($zoneData)) { |
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$validTimezone = $this->dataTree['timezones'][$zoneData]; |
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} |
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return $validTimezone; |
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} |
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/** |
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* Check if timezone is valid |
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* @param $timeZone |
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* @return bool |
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*/ |
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protected function isValidTimeZone($timeZone) |
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{ |
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return $timeZone != self::NONE_TIMEZONE; |
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} |
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/** |
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* Main function for looking the timezone associated to a particular location (latitude, longitude) |
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* @param $latitude |
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* @param $longitude |
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* @return string |
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* @throws ErrorException |
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*/ |
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public function lookForTimeZone($latitude, $longitude) |
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{ |
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$geoQuadrant = new Element(); |
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$timeZone = self::NONE_TIMEZONE; |
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$quadrantPath = ''; |
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$quadrantTree = $this->dataTree['lookup']; |
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while (!$this->isValidTimeZone($timeZone)) { |
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$geoQuadrant->moveToNextQuadrant($latitude, $longitude); |
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if (!isset($quadrantTree[$geoQuadrant->getLevel()])) { |
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break; |
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} |
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$quadrantTree = $quadrantTree[$geoQuadrant->getLevel()]; |
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$quadrantPath = $quadrantPath . $geoQuadrant->getLevel(); |
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$timeZone = $this->evaluateQuadrantData($quadrantTree, $quadrantPath, $latitude, $longitude); |
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$geoQuadrant->updateMidCoordinates(); |
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} |
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if ($timeZone == self::NONE_TIMEZONE || $timeZone == Utils::NOT_FOUND_IN_FEATURES) { |
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throw new ErrorException("ERROR: TimeZone not found"); |
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} |
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return $timeZone; |
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} |
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} |
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minube /
geo-timezone
