org.geotools.referencing.datum
Class DefaultPrimeMeridian

Object
  extended by Formattable
      extended by AbstractIdentifiedObject
          extended by DefaultPrimeMeridian
All Implemented Interfaces:
Serializable, PrimeMeridian, IdentifiedObject

public class DefaultPrimeMeridian
extends AbstractIdentifiedObject
implements PrimeMeridian

A prime meridian defines the origin from which longitude values are determined. The name initial value is "Greenwich", and that value shall be used when the greenwich longitude value is zero.

Since:
2.1
Author:
Martin Desruisseaux (IRD)
See Also:
Serialized Form

Field Summary
static DefaultPrimeMeridian GREENWICH
          The Greenwich meridian, with angular measurements in decimal degrees.
 
Fields inherited from class AbstractIdentifiedObject
EMPTY_ALIAS_ARRAY, EMPTY_IDENTIFIER_ARRAY, IDENTIFIER_COMPARATOR, NAME_COMPARATOR, REMARKS_COMPARATOR
 
Fields inherited from class Formattable
SINGLE_LINE
 
Fields inherited from interface IdentifiedObject
ALIAS_KEY, IDENTIFIERS_KEY, NAME_KEY, REMARKS_KEY
 
Constructor Summary
DefaultPrimeMeridian(Map<String,?> properties, double greenwichLongitude, Unit<Angle> angularUnit)
          Constructs a prime meridian from a set of properties.
DefaultPrimeMeridian(PrimeMeridian meridian)
          Constructs a new prime meridian with the same values than the specified one.
DefaultPrimeMeridian(String name, double greenwichLongitude)
          Constructs a prime meridian from a name.
DefaultPrimeMeridian(String name, double greenwichLongitude, Unit<Angle> angularUnit)
          Constructs a prime meridian from a name.
 
Method Summary
 boolean equals(AbstractIdentifiedObject object, boolean compareMetadata)
          Compare this prime meridian with the specified object for equality.
protected  String formatWKT(Formatter formatter)
          Format the inner part of a Well Known Text (WKT) element.
 Unit<Angle> getAngularUnit()
          Returns the angular unit of the Greenwich longitude.
 double getGreenwichLongitude()
          Longitude of the prime meridian measured from the Greenwich meridian, positive eastward.
 double getGreenwichLongitude(Unit<Angle> targetUnit)
          Returns the longitude value relative to the Greenwich Meridian, expressed in the specified units.
 int hashCode()
          Returns a hash value for this prime meridian.
 
Methods inherited from class AbstractIdentifiedObject
asSet, ensureAngularUnit, ensureLinearUnit, ensureNonNull, ensureNonNull, ensureTimeUnit, equals, equals, equals, equals, getAlias, getIdentifier, getIdentifier, getIdentifiers, getName, getName, getName, getProperties, getProperties, getRemarks, nameMatches, nameMatches, nameMatches
 
Methods inherited from class Formattable
cleanupThreadLocals, toString, toWKT, toWKT, toWKT, toWKT
 
Methods inherited from class Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 
Methods inherited from interface IdentifiedObject
getAlias, getIdentifiers, getName, getRemarks, toWKT
 

Field Detail

GREENWICH

public static final DefaultPrimeMeridian GREENWICH
The Greenwich meridian, with angular measurements in decimal degrees.

Constructor Detail

DefaultPrimeMeridian

public DefaultPrimeMeridian(PrimeMeridian meridian)
Constructs a new prime meridian with the same values than the specified one. This copy constructor provides a way to wrap an arbitrary implementation into a Geotools one or a user-defined one (as a subclass), usually in order to leverage some implementation-specific API. This constructor performs a shallow copy, i.e. the properties are not cloned.

Parameters:
meridian - The prime meridian to copy.
Since:
2.2

DefaultPrimeMeridian

public DefaultPrimeMeridian(String name,
                            double greenwichLongitude)
Constructs a prime meridian from a name. The greenwichLongitude value is assumed in decimal degrees.

Parameters:
name - The datum name.
greenwichLongitude - The longitude value relative to the Greenwich Meridian.

DefaultPrimeMeridian

public DefaultPrimeMeridian(String name,
                            double greenwichLongitude,
                            Unit<Angle> angularUnit)
Constructs a prime meridian from a name.

Parameters:
name - The datum name.
greenwichLongitude - The longitude value relative to the Greenwich Meridian.
angularUnit - The angular unit of the longitude.

DefaultPrimeMeridian

public DefaultPrimeMeridian(Map<String,?> properties,
                            double greenwichLongitude,
                            Unit<Angle> angularUnit)
Constructs a prime meridian from a set of properties. The properties map is given unchanged to the super-class constructor.

Parameters:
properties - Set of properties. Should contains at least "name".
greenwichLongitude - The longitude value relative to the Greenwich Meridian.
angularUnit - The angular unit of the longitude.
Method Detail

getGreenwichLongitude

public double getGreenwichLongitude()
Longitude of the prime meridian measured from the Greenwich meridian, positive eastward. The greenwichLongitude initial value is zero, and that value shall be used when the meridian name value is "Greenwich".

Specified by:
getGreenwichLongitude in interface PrimeMeridian
Returns:
The prime meridian Greenwich longitude, in angular unit.

getGreenwichLongitude

public double getGreenwichLongitude(Unit<Angle> targetUnit)
Returns the longitude value relative to the Greenwich Meridian, expressed in the specified units. This convenience method makes it easier to obtain longitude in decimal degrees (getGreenwichLongitude(NonSI.DEGREE_ANGLE)), regardless of the underlying angular units of this prime meridian.

Parameters:
targetUnit - The unit in which to express longitude.
Returns:
The Greenwich longitude in the given units.

getAngularUnit

public Unit<Angle> getAngularUnit()
Returns the angular unit of the Greenwich longitude.

Specified by:
getAngularUnit in interface PrimeMeridian
Returns:
The angular unit of greenwich longitude.

equals

public boolean equals(AbstractIdentifiedObject object,
                      boolean compareMetadata)
Compare this prime meridian with the specified object for equality.

Overrides:
equals in class AbstractIdentifiedObject
Parameters:
object - The object to compare to this.
compareMetadata - true for performing a strict comparaison, or false for comparing only properties relevant to transformations.
Returns:
true if both objects are equal.

hashCode

public int hashCode()
Returns a hash value for this prime meridian. Name, remarks and the like are not taken in account. In other words, two prime meridians will return the same hash value if they are equal in the sense of equals(AbstractIdentifiedObject, false).

Overrides:
hashCode in class AbstractIdentifiedObject
Returns:
The hash code value. This value doesn't need to be the same in past or future versions of this class.

formatWKT

protected String formatWKT(Formatter formatter)
Format the inner part of a Well Known Text (WKT) element.

Overrides:
formatWKT in class Formattable
Parameters:
formatter - The formatter to use.
Returns:
The WKT element name, which is "PRIMEM"
See Also:
Formattable.toWKT(), Formattable.toString()


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