org.apache.solr.util

Class DistanceUnits

java.lang.Object

org.apache.solr.util.DistanceUnits

public class DistanceUnits
extends Object

Used with a spatial field type for all distance measurements.

See Also:

AbstractSpatialFieldType

Field Summary

Fields

Modifier and Type	Field and Description
static DistanceUnits	DEGREES
static String	DEGREES_PARAM
static DistanceUnits	KILOMETERS
static String	KILOMETERS_PARAM
static DistanceUnits	MILES
static String	MILES_PARAM

Method Summary

Modifier and Type	Method and Description
static void	addUnits(String strId, double earthRadius, double multiplierThisToDegrees) Custom distance units can be supplied using this method.
double	getEarthRadius()
String	getStringIdentifier()
static Set<String>	getSupportedUnits()
double	multiplierFromDegreesToThisUnit()
double	multiplierFromThisUnitToDegrees()
String	toString()
static DistanceUnits	valueOf(String str) Parses a string representation of distance units and returns its implementing class instance.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

KILOMETERS_PARAM

public static final String KILOMETERS_PARAM

See Also:

Constant Field Values

MILES_PARAM

public static final String MILES_PARAM

See Also:

Constant Field Values

DEGREES_PARAM

public static final String DEGREES_PARAM

See Also:

Constant Field Values

KILOMETERS

public static final DistanceUnits KILOMETERS

MILES

public static final DistanceUnits MILES

DEGREES

public static final DistanceUnits DEGREES

Method Detail

valueOf

public static DistanceUnits valueOf(String str)

Parses a string representation of distance units and returns its implementing class instance. Preferred way to parse a DistanceUnits would be to use AbstractSpatialFieldType.parseDistanceUnits(String), since it will default to one defined on the field type if the string is null.

Parameters:

str - String representation of distance units, e.g. "kilometers", "miles" etc. (null ok)

Returns:

an instance of the concrete DistanceUnits, null if not found.

getSupportedUnits

public static Set<String> getSupportedUnits()

getEarthRadius

public double getEarthRadius()

Returns:

Radius of the earth in this distance units

multiplierFromThisUnitToDegrees

public double multiplierFromThisUnitToDegrees()

Returns:

multiplier needed to convert a distance in current units to degrees

multiplierFromDegreesToThisUnit

public double multiplierFromDegreesToThisUnit()

Returns:

multiplier needed to convert a distance in degrees to current units

getStringIdentifier

public String getStringIdentifier()

Returns:

the string identifier associated with this units instance

addUnits

public static void addUnits(String strId,
                            double earthRadius,
                            double multiplierThisToDegrees)

Custom distance units can be supplied using this method. It's thread-safe.

Parameters:

strId - string identifier for the units

earthRadius - radius of earth in supplied units

multiplierThisToDegrees - multiplier to convert to degrees

toString

public String toString()

Overrides:

toString in class Object