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<?php
namespace SMW\SQLStore\EntityStore\DIHandlers;
use SMW\SQLStore\EntityStore\DataItemHandler;
use SMW\SQLStore\EntityStore\Exception\DataItemHandlerException;
use SMW\SQLStore\TableBuilder\FieldType;
use SMWDataItem as DataItem;
use SMWDIGeoCoord as DIGeoCoord;
/**
* This class implements store access to DIGeoCoord data items.
*
* @note The table layout and behavior of this class is not coherent with the
* way that other DIs work. This is because of the unfortunate use of the
* concept table to store extra cache data, but also due to the design of
* concept DIs. This will be cleaned up at some point.
*
* @license GNU GPL v2+
* @since 1.8
*
* @author Nischay Nahata
*/
class DIGeoCoordinateHandler extends DataItemHandler {
/**
* Coordinates have three fields: a string version to keep the
* serialized value (exact), and two floating point columns for
* latitude and longitude (inexact, useful for bounding box selects).
* Altitude is not stored in an extra column since no operation uses
* this for anything so far.
*
* @since 1.8
*
* {@inheritDoc}
*/
public function getTableFields() {
return [
'o_serialized' => FieldType::FIELD_TITLE,
'o_lat' => FieldType::TYPE_DOUBLE,
'o_lon' => FieldType::TYPE_DOUBLE
];
}
/**
* @since 1.8
*
* {@inheritDoc}
*/
public function getFetchFields() {
return [
'o_serialized' => FieldType::FIELD_TITLE
];
}
/**
* @since 1.8
*
* {@inheritDoc}
*/
public function getTableIndexes() {
return [
'p_id,o_serialized',
'o_lat,o_lon'
];
}
/**
* @since 1.8
*
* {@inheritDoc}
*/
public function getWhereConds( DataItem $dataItem ) {
return [
'o_serialized' => $dataItem->getSerialization()
];
}
/**
* @since 1.8
*
* {@inheritDoc}
*/
public function getInsertValues( DataItem $dataItem ) {
return [
'o_serialized' => $dataItem->getSerialization(),
'o_lat' => (string)$dataItem->getLatitude(),
'o_lon' => (string)$dataItem->getLongitude()
];
}
/**
* @since 1.8
*
* {@inheritDoc}
*/
public function getIndexField() {
return 'o_serialized';
}
/**
* Coordinates do not have a general string version that
* could be used for string search, so this method returns
* no label column (empty string).
*
* @since 1.8
*
* {@inheritDoc}
*/
public function getLabelField() {
return '';
}
/**
* @since 1.8
*
* {@inheritDoc}
*/
public function dataItemFromDBKeys( $dbkeys ) {
if ( is_string( $dbkeys ) ) {
return DIGeoCoord::doUnserialize( $dbkeys );
}
throw new DataItemHandlerException( 'Failed to create data item from DB keys.' );
}
}
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