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<?php |
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declare( strict_types = 1 ); |
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namespace Maps\SemanticMW; |
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use DataValues\Geo\Values\LatLongValue; |
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use InvalidArgumentException; |
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use Maps\GeoFunctions; |
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use Maps\Presentation\MapsDistanceParser; |
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use SMW\DataValueFactory; |
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use SMW\DIProperty; |
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use SMW\Query\Language\ValueDescription; |
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use SMWDataItem; |
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use SMWDIGeoCoord; |
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use SMWThingDescription; |
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use Wikimedia\Rdbms\IDatabase; |
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/** |
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* Description of a geographical area defined by a coordinates set and a distance to the bounds. |
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* The bounds are a 'rectangle' (but bend due to the earths curvature), as the resulting query |
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* would otherwise be to resource intensive. |
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* |
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* @licence GNU GPL v2+ |
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* @author Jeroen De Dauw < [email protected] > |
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*/ |
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class AreaDescription extends ValueDescription { |
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/** |
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* @var SMWDIGeoCoord |
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*/ |
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private $center; |
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private $radius; |
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public function __construct( SMWDataItem $areaCenter, int $comparator, string $radius, DIProperty $property = null ) { |
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if ( !( $areaCenter instanceof SMWDIGeoCoord ) ) { |
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throw new InvalidArgumentException( '$areaCenter needs to be a SMWDIGeoCoord' ); |
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} |
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parent::__construct( $areaCenter, $property, $comparator ); |
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$this->center = $areaCenter; |
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$this->radius = $radius; |
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} |
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/** |
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* @see Description::prune |
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*/ |
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public function prune( &$maxsize, &$maxdepth, &$log ) { |
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if ( ( $maxsize < $this->getSize() ) || ( $maxdepth < $this->getDepth() ) ) { |
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$log[] = $this->getQueryString(); |
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$result = new SMWThingDescription(); |
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$result->setPrintRequests( $this->getPrintRequests() ); |
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return $result; |
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} |
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$maxsize = $maxsize - $this->getSize(); |
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$maxdepth = $maxdepth - $this->getDepth(); |
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return $this; |
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} |
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public function getQueryString( $asValue = false ) { |
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$centerString = DataValueFactory::getInstance()->newDataValueByItem( |
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$this->center, |
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$this->getProperty() |
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)->getWikiValue(); |
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$queryString = "$centerString ({$this->radius})"; |
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return $asValue ? $queryString : "[[$queryString]]"; |
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} |
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/** |
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* @see SomePropertyInterpreter::mapValueDescription |
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* |
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* FIXME: store specific code should be in the store component |
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* |
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* @param string $tableName |
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* @param string[] $fieldNames |
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* @param IDatabase $db |
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* |
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* @return string|false |
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*/ |
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public function getSQLCondition( $tableName, array $fieldNames, IDatabase $db ) { |
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if ( $this->center->getDIType() != SMWDataItem::TYPE_GEO ) { |
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throw new \LogicException( 'Constructor should have prevented this' ); |
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} |
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if ( !$this->comparatorIsSupported() ) { |
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return false; |
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} |
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$bounds = $this->getBoundingBox(); |
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$north = $db->addQuotes( $bounds['north'] ); |
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$east = $db->addQuotes( $bounds['east'] ); |
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$south = $db->addQuotes( $bounds['south'] ); |
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$west = $db->addQuotes( $bounds['west'] ); |
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$isEq = $this->getComparator() == SMW_CMP_EQ; |
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$smallerThen = $isEq ? '<' : '>='; |
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$biggerThen = $isEq ? '>' : '<='; |
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$joinCond = $isEq ? 'AND' : 'OR'; |
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$conditions = []; |
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$conditions[] = "{$tableName}.$fieldNames[1] $smallerThen $north"; |
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$conditions[] = "{$tableName}.$fieldNames[1] $biggerThen $south"; |
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$conditions[] = "{$tableName}.$fieldNames[2] $smallerThen $east"; |
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$conditions[] = "{$tableName}.$fieldNames[2] $biggerThen $west"; |
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return implode( " $joinCond ", $conditions ); |
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} |
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private function comparatorIsSupported(): bool { |
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return $this->getComparator() === SMW_CMP_EQ || $this->getComparator() === SMW_CMP_NEQ; |
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} |
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/** |
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* @return float[] An associative array containing the limits with keys north, east, south and west. |
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*/ |
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public function getBoundingBox(): array { |
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$center = new LatLongValue( |
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$this->center->getLatitude(), |
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$this->center->getLongitude() |
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); |
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$radiusInMeters = MapsDistanceParser::parseDistance( $this->radius ); // TODO: this can return false |
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$north = GeoFunctions::findDestination( $center, 0, $radiusInMeters ); |
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$east = GeoFunctions::findDestination( $center, 90, $radiusInMeters ); |
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$south = GeoFunctions::findDestination( $center, 180, $radiusInMeters ); |
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$west = GeoFunctions::findDestination( $center, 270, $radiusInMeters ); |
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return [ |
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'north' => $north['lat'], |
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'east' => $east['lon'], |
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'south' => $south['lat'], |
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'west' => $west['lon'], |
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]; |
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} |
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} |
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