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<?php
namespace Elastica\Filter;
use Elastica\Exception\InvalidException;
/**
* Geo distance filter.
*
* @author Nicolas Ruflin <spam@ruflin.com>
*
* @link http://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-geo-distance-filter.html
*/
abstract class AbstractGeoDistance extends AbstractFilter
{
const LOCATION_TYPE_GEOHASH = 'geohash';
const LOCATION_TYPE_LATLON = 'latlon';
/**
* Location type.
*
* Decides if this filter uses latitude/longitude or geohash for the location.
* Values are "latlon" or "geohash".
*
* @var string
*/
protected $_locationType = null;
/**
* Key.
*
* @var string
*/
protected $_key = null;
/**
* Latitude.
*
* @var float
*/
protected $_latitude = null;
/**
* Longitude.
*
* @var float
*/
protected $_longitude = null;
/**
* Geohash.
*
* @var string
*/
protected $_geohash = null;
/**
* Create GeoDistance object.
*
* @param string $key Key
* @param array|string $location Location as array or geohash: array('lat' => 48.86, 'lon' => 2.35) OR 'drm3btev3e86'
*
* @internal param string $distance Distance
*/
public function __construct($key, $location)
{
// Key
$this->setKey($key);
$this->setLocation($location);
}
/**
* @param string $key
*
* @return $this
*/
public function setKey($key)
{
$this->_key = $key;
return $this;
}
/**
* @param array|string $location
*
* @throws \Elastica\Exception\InvalidException
*
* @return $this
*/
public function setLocation($location)
{
// Location
if (is_array($location)) { // Latitude/Longitude
// Latitude
if (isset($location['lat'])) {
$this->setLatitude($location['lat']);
} else {
throw new InvalidException('$location[\'lat\'] has to be set');
}
// Longitude
if (isset($location['lon'])) {
$this->setLongitude($location['lon']);
} else {
throw new InvalidException('$location[\'lon\'] has to be set');
}
} elseif (is_string($location)) { // Geohash
$this->setGeohash($location);
} else { // Invalid location
throw new InvalidException('$location has to be an array (latitude/longitude) or a string (geohash)');
}
return $this;
}
/**
* @param float $latitude
*
* @return $this
*/
public function setLatitude($latitude)
{
$this->_latitude = (float) $latitude;
$this->_locationType = self::LOCATION_TYPE_LATLON;
return $this;
}
/**
* @param float $longitude
*
* @return $this
*/
public function setLongitude($longitude)
{
$this->_longitude = (float) $longitude;
$this->_locationType = self::LOCATION_TYPE_LATLON;
return $this;
}
/**
* @param string $geohash
*
* @return $this
*/
public function setGeohash($geohash)
{
$this->_geohash = $geohash;
$this->_locationType = self::LOCATION_TYPE_GEOHASH;
return $this;
}
/**
* @throws \Elastica\Exception\InvalidException
*
* @return array|string
*/
protected function _getLocationData()
{
if ($this->_locationType === self::LOCATION_TYPE_LATLON) { // Latitude/longitude
$location = array();
if (isset($this->_latitude)) { // Latitude
$location['lat'] = $this->_latitude;
} else {
throw new InvalidException('Latitude has to be set');
}
if (isset($this->_longitude)) { // Geohash
$location['lon'] = $this->_longitude;
} else {
throw new InvalidException('Longitude has to be set');
}
} elseif ($this->_locationType === self::LOCATION_TYPE_GEOHASH) { // Geohash
$location = $this->_geohash;
} else { // Invalid location type
throw new InvalidException('Invalid location type');
}
return $location;
}
/**
* @see \Elastica\Param::toArray()
*
* @throws \Elastica\Exception\InvalidException
*
* @return array
*/
public function toArray()
{
$this->setParam($this->_key, $this->_getLocationData());
return parent::toArray();
}
}
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