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<?php |
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namespace Wikibase\QueryEngine\SQLStore\DVHandler; |
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use Ask\Language\Description\ValueDescription; |
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use DataValues\DataValue; |
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use DataValues\Geo\GlobeMath; |
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use DataValues\Geo\Values\LatLongValue; |
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use Doctrine\DBAL\Query\QueryBuilder; |
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use Doctrine\DBAL\Schema\Table; |
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use Doctrine\DBAL\Types\Type; |
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use InvalidArgumentException; |
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use Wikibase\QueryEngine\QueryNotSupportedException; |
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use Wikibase\QueryEngine\SQLStore\DataValueHandler; |
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/** |
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* Represents the mapping between LatLongValue and |
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* the corresponding table in the store. |
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* |
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* @since 0.1 |
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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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* @author Thiemo Kreuz |
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*/ |
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class LatLongHandler extends DataValueHandler { |
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/** |
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* Default to the Earth/Moon longitude range |
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*/ |
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const MINIMUM_LONGITUDE = -180; |
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/** |
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* Default to approximately a second (1/3600) for range searches. This is an arbitrary |
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* decision because coordinates like 12°34'56" with a precision of a second are very common. |
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*/ |
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const EPSILON = 0.00028; |
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/** |
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* @var GlobeMath |
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*/ |
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private $math; |
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public function __construct() { |
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$this->math = new GlobeMath(); |
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} |
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/** |
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* @see DataValueHandler::getBaseTableName |
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* |
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* @return string |
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*/ |
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protected function getBaseTableName() { |
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return 'latlong'; |
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} |
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/** |
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* @see DataValueHandler::completeTable |
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* |
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* @param Table $table |
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*/ |
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protected function completeTable( Table $table ) { |
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$table->addColumn( 'value_lat', Type::FLOAT ); |
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$table->addColumn( 'value_lon', Type::FLOAT ); |
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$table->addColumn( 'hash', Type::STRING, array( 'length' => 32 ) ); |
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// TODO: We still need to find out if combined indexes are better or not. |
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$table->addIndex( array( 'value_lon', 'value_lat' ) ); |
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} |
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/** |
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* @see DataValueHandler::getSortFieldNames |
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* |
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* @return string[] |
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*/ |
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public function getSortFieldNames() { |
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// Order by West-East first |
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return array( 'value_lon', 'value_lat' ); |
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} |
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/** |
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* @see DataValueHandler::getInsertValues |
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* |
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* @param DataValue $value |
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* |
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* @return array |
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* @throws InvalidArgumentException |
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*/ |
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public function getInsertValues( DataValue $value ) { |
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if ( $value instanceof LatLongValue ) { |
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$normalized = $this->math->normalizeLatLong( $value, self::MINIMUM_LONGITUDE ); |
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} else { |
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throw new InvalidArgumentException( 'Value is not a LatLongValue.' ); |
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} |
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$values = array( |
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'value_lat' => $normalized->getLatitude(), |
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'value_lon' => $normalized->getLongitude(), |
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// No special human-readable hash needed, everything required is in the other fields. |
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'hash' => $this->getEqualityFieldValue( $value ), |
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); |
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return $values; |
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} |
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/** |
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* @see DataValueHandler::addMatchConditions |
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* |
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* @param QueryBuilder $builder |
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* @param ValueDescription $description |
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* |
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* @throws InvalidArgumentException |
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* @throws QueryNotSupportedException |
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*/ |
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public function addMatchConditions( QueryBuilder $builder, ValueDescription $description ) { |
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$value = $description->getValue(); |
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if ( $value instanceof LatLongValue ) { |
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$epsilon = self::EPSILON; |
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$value = $this->math->normalizeLatLong( $value, self::MINIMUM_LONGITUDE ); |
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} else { |
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throw new InvalidArgumentException( 'Value is not a LatLongValue.' ); |
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} |
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if ( $description->getComparator() === ValueDescription::COMP_EQUAL ) { |
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$this->addInRangeConditions( $builder, $value, $epsilon ); |
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} else { |
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parent::addMatchConditions( $builder, $description ); |
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} |
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} |
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/** |
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* @param QueryBuilder $builder |
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* @param LatLongValue $value |
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* @param float|int $epsilon |
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*/ |
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private function addInRangeConditions( QueryBuilder $builder, LatLongValue $value, $epsilon ) { |
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$lat = $value->getLatitude(); |
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$lon = $value->getLongitude(); |
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$builder->andWhere( 'value_lat >= :min_lat' ); |
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$builder->andWhere( 'value_lat <= :max_lat' ); |
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$builder->andWhere( 'value_lon >= :min_lon' ); |
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$builder->andWhere( 'value_lon <= :max_lon' ); |
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$builder->setParameter( ':min_lat', $lat - $epsilon ); |
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$builder->setParameter( ':max_lat', $lat + $epsilon ); |
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$builder->setParameter( ':min_lon', $lon - $epsilon ); |
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$builder->setParameter( ':max_lon', $lon + $epsilon ); |
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} |
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} |
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wmde /
WikibaseQueryEngine
