Package org.apache.sis.referencing.datum
Class DefaultPrimeMeridian
Object
FormattableObject
AbstractIdentifiedObject
DefaultPrimeMeridian
- All Implemented Interfaces:
- Serializable,- Formattable,- Deprecable,- LenientComparable,- PrimeMeridian,- IdentifiedObject
Defines the origin from which longitude values are determined.
 
Creating new prime meridian instances
New instances can be created either directly by specifying all information to a factory method (choices 3 and 4 below), or indirectly by specifying the identifier of an entry in a database (choices 1 and 2 below). In particular, the EPSG repository provides definitions for many prime meridians, and Apache SIS provides convenience shortcuts for some of them.Choice 1 in the following list is the easiest but most restrictive way to get a prime meridian. The other choices provide more freedom. Each choice delegates its work to the subsequent items (in the default configuration), so this list can be seen as top to bottom API.
- Create a PrimeMeridianfrom one of the static convenience shortcuts listed inCommonCRS.primeMeridian().
- Create a PrimeMeridianfrom an identifier in a database by invokingDatumAuthorityFactory.createPrimeMeridian(String).
- Create a PrimeMeridianby invoking theDatumFactory.createPrimeMeridian(…)method (implemented for example byGeodeticObjectFactory).
- Create a DefaultPrimeMeridianby invoking the constructor.
PrimeMeridian pm = CommonCRS.WGS84.primeMeridian();
Immutability and thread safety
This class is immutable and thus thread-safe if the property values (not necessarily the map itself) given to the constructor are also immutable. Unless otherwise noted in the javadoc, this condition holds if all components were created using only SIS factories and static constants.- Since:
- 0.4
- See Also:
Defined in the sis-referencing module
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Field SummaryFields inherited from class AbstractIdentifiedObjectDEPRECATED_KEY, LOCALE_KEYFields inherited from interface IdentifiedObjectALIAS_KEY, IDENTIFIERS_KEY, NAME_KEY, REMARKS_KEY
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Constructor SummaryConstructorsModifierConstructorDescriptionDefaultPrimeMeridian(Map<String, ?> properties, double greenwichLongitude, Unit<Angle> angularUnit) Creates a prime meridian from the given properties.protectedDefaultPrimeMeridian(PrimeMeridian meridian) Creates a new prime meridian with the same values than the specified one.
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Method SummaryModifier and TypeMethodDescriptionstatic DefaultPrimeMeridiancastOrCopy(PrimeMeridian object) Returns a SIS prime meridian implementation with the same values than the given arbitrary implementation.protected longInvoked byhashCode()for computing the hash code when first needed.booleanequals(Object object, ComparisonMode mode) Compares this prime meridian with the specified object for equality.protected StringFormats this prime meridian as a Well Known TextPrimeMeridian[…]element.Returns the angular unit of the Greenwich longitude.doubleLongitude of the prime meridian measured from the Greenwich meridian, positive eastward.doublegetGreenwichLongitude(Unit<Angle> unit) Returns the longitude value relative to the Greenwich Meridian, expressed in the specified units.Class<? extends PrimeMeridian>Returns the GeoAPI interface implemented by this class.Methods inherited from class AbstractIdentifiedObjectcastOrCopy, equals, formatTo, getAlias, getDescription, getIdentifiers, getName, getRemarks, hashCode, isDeprecated, isHeuristicMatchForNameMethods inherited from class FormattableObjectprint, toString, toString, toWKTMethods inherited from class Objectclone, finalize, getClass, notify, notifyAll, wait, wait, waitMethods inherited from interface IdentifiedObjectgetAlias, getIdentifiers, getName, getRemarks, toWKT
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Constructor Details- 
DefaultPrimeMeridianpublic DefaultPrimeMeridian(Map<String, ?> properties, double greenwichLongitude, Unit<Angle> angularUnit) Creates a prime meridian from the given properties. The properties map is given unchanged to the super-class constructor. The following table is a reminder of main (not all) properties:Recognized properties (non exhaustive list) Property name Value type Returned by "name" ReferenceIdentifierorStringAbstractIdentifiedObject.getName()"alias" GenericNameorCharSequence(optionally as array)AbstractIdentifiedObject.getAlias()"identifiers" ReferenceIdentifier(optionally as array)AbstractIdentifiedObject.getIdentifiers()"remarks" InternationalStringorStringAbstractIdentifiedObject.getRemarks()- Parameters:
- properties- the properties to be given to the identified object.
- greenwichLongitude- the longitude value relative to the Greenwich Meridian.
- angularUnit- the angular unit of the longitude.
- See Also:
 
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DefaultPrimeMeridianCreates a new prime meridian with the same values than the specified one. This copy constructor provides a way to convert an arbitrary implementation into a SIS 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.
- See Also:
 
 
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Method Details- 
castOrCopyReturns a SIS prime meridian implementation with the same values than the given arbitrary implementation. If the given object isnull, then this method returnsnull. Otherwise if the given object is already a SIS implementation, then the given object is returned unchanged. Otherwise a new SIS implementation is created and initialized to the attribute values of the given object.- Parameters:
- object- the object to get as a SIS implementation, or- nullif none.
- Returns:
- a SIS implementation containing the values of the given object (may be the
         given object itself), or nullif the argument was null.
 
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getInterfaceReturns the GeoAPI interface implemented by this class. The SIS implementation returnsPrimeMeridian.class.Note for implementers: Subclasses usually do not need to override this method since GeoAPI does not definePrimeMeridiansub-interface. Overriding possibility is left mostly for implementers who wish to extend GeoAPI with their own set of interfaces.- Overrides:
- getInterfacein class- AbstractIdentifiedObject
- Returns:
- PrimeMeridian.classor a user-defined sub-interface.
 
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getGreenwichLongitudepublic double getGreenwichLongitude()Longitude of the prime meridian measured from the Greenwich meridian, positive eastward.- Specified by:
- getGreenwichLongitudein interface- PrimeMeridian
- Returns:
- the prime meridian Greenwich longitude, in angular unit.
 
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getGreenwichLongitudeReturns 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 using the following code, regardless of the underlying angular units of this prime meridian:double longitudeInDegrees = primeMeridian.getGreenwichLongitude(Units.DEGREE); - Parameters:
- unit- the unit in which to express longitude.
- Returns:
- the Greenwich longitude in the given units.
 
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getAngularUnitReturns the angular unit of the Greenwich longitude.- Specified by:
- getAngularUnitin interface- PrimeMeridian
- Returns:
- the angular unit of the Greenwich longitude.
 
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equalsCompares this prime meridian with the specified object for equality.- Specified by:
- equalsin interface- LenientComparable
- Overrides:
- equalsin class- AbstractIdentifiedObject
- Parameters:
- object- the object to compare to- this.
- mode-- STRICTfor performing a strict comparison, or- IGNORE_METADATAfor comparing only properties relevant to coordinate transformations.
- Returns:
- trueif both objects are equal.
- See Also:
 
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computeHashCodeprotected long computeHashCode()Invoked byhashCode()for computing the hash code when first needed. SeeAbstractIdentifiedObject.computeHashCode()for more information.- Overrides:
- computeHashCodein class- AbstractIdentifiedObject
- Returns:
- the hash code value. This value may change in any future Apache SIS version.
 
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formatToFormats this prime meridian as a Well Known TextPrimeMeridian[…]element.- Overrides:
- formatToin class- AbstractIdentifiedObject
- Parameters:
- formatter- the formatter where to format the inner content of this WKT element.
- Returns:
- "PrimeMeridian"(WKT 2) or- "PrimeM"(WKT 1).
- See Also:
 
 
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