- All Implemented Interfaces:
Serializable
,Formattable
,Deprecable
,LenientComparable
,CoordinateReferenceSystem
,IdentifiedObject
,ReferenceSystem
- Direct Known Subclasses:
DefaultCompoundCRS
,DefaultDerivedCRS
,DefaultEngineeringCRS
,DefaultGeocentricCRS
,DefaultGeographicCRS
,DefaultImageCRS
,DefaultParametricCRS
,DefaultProjectedCRS
,DefaultTemporalCRS
,DefaultVerticalCRS
Coordinate reference system, defined by a coordinate system
and (usually) a datum.
A coordinate reference system (CRS) consists of an ordered sequence of
coordinate system axes
that are related to the earth through the datum.
Most coordinate reference system do not move relative to the earth, except for
engineering coordinate reference systems
defined on moving platforms such as cars, ships, aircraft, and spacecraft.
However, most subclasses restrict the allowed number of dimensions.
Coordinate reference systems can have an arbitrary number of dimensions. The actual dimension of a given instance can be determined as below:
int dimension = crs.getCoordinateSystem().getDimension();
Instantiation
This class is conceptually abstract, even if it is technically possible to instantiate it. Typical applications should create instances of the most specific subclass prefixed byDefault
instead.
An exception to this rule may occur when it is not possible to identify the exact CRS type.
Immutability and thread safety
This base class is immutable and thus thread-safe if the property values (not necessarily the map itself) given to the constructor are also immutable. Most SIS subclasses and related classes are immutable under similar conditions. This means that unless otherwise noted in the javadoc,CoordinateReferenceSystem
instances
created using only SIS factories and static constants can be shared by many objects and passed between threads
without synchronization.- Since:
- 0.4
- See Also:
-
Field Summary
Fields inherited from class AbstractIdentifiedObject
DEPRECATED_KEY, LOCALE_KEY
Fields inherited from interface IdentifiedObject
ALIAS_KEY, IDENTIFIERS_KEY, NAME_KEY, REMARKS_KEY
Fields inherited from interface ReferenceSystem
DOMAIN_OF_VALIDITY_KEY, SCOPE_KEY
-
Constructor Summary
ModifierConstructorDescriptionAbstractCRS
(Map<String, ?> properties, CoordinateSystem cs) Creates a coordinate reference system from the given properties and coordinate system.protected
Constructs a new coordinate reference system with the same values than the specified one. -
Method Summary
Modifier and TypeMethodDescriptionstatic AbstractCRS
Returns a SIS coordinate reference system implementation with the values of the given arbitrary implementation.protected long
Invoked byhashCode()
for computing the hash code when first needed.boolean
equals
(Object object, ComparisonMode mode) Compares this coordinate reference system with the specified object for equality.forConvention
(AxesConvention convention) Returns a coordinate reference system equivalent to this one but with axes rearranged according the given convention.protected String
Formats the inner part of the Well Known Text (WKT) representation of this CRS.Returns the coordinate system.Class
<? extends CoordinateReferenceSystem> Returns the GeoAPI interface implemented by this class.Methods inherited from class AbstractReferenceSystem
getDomainOfValidity, getScope
Methods inherited from class AbstractIdentifiedObject
castOrCopy, equals, formatTo, getAlias, getDescription, getDomains, getIdentifiers, getName, getRemarks, hashCode, isDeprecated, isHeuristicMatchForName
Methods inherited from class FormattableObject
print, toString, toString, toWKT
Methods inherited from class Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
Methods inherited from interface IdentifiedObject
getAlias, getIdentifiers, getName, getRemarks, toWKT
Methods inherited from interface ReferenceSystem
getDomainOfValidity, getScope
-
Constructor Details
-
AbstractCRS
Creates a coordinate reference system from the given properties and coordinate system. The properties given in argument follow the same rules than for 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" ReferenceIdentifier
orString
AbstractIdentifiedObject.getName()
"alias" GenericName
orCharSequence
(optionally as array)AbstractIdentifiedObject.getAlias()
"identifiers" ReferenceIdentifier
(optionally as array)AbstractIdentifiedObject.getIdentifiers()
"domains" DefaultObjectDomain
(optionally as array)AbstractIdentifiedObject.getDomains()
"remarks" InternationalString
orString
AbstractIdentifiedObject.getRemarks()
- Parameters:
properties
- the properties to be given to the coordinate reference system.cs
- the coordinate system.
-
AbstractCRS
Constructs a new coordinate reference system 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:
crs
- the coordinate reference system to copy.- See Also:
-
-
Method Details
-
castOrCopy
Returns a SIS coordinate reference system implementation with the values of the given arbitrary implementation. This method performs the first applicable action in the following choices:- If the given object is
null
, then this method returnsnull
. - Otherwise if the given object is an instance of
GeodeticCRS
(including theGeographicCRS
andGeocentricCRS
subtypes),VerticalCRS
,TemporalCRS
,EngineeringCRS
,ImageCRS
orDefaultCompoundCS
, then this method delegates to thecastOrCopy(…)
method of the corresponding SIS subclass. Note that if the given object implements more than one of the above-cited interfaces, then thecastOrCopy(…)
method to be used is unspecified. - Otherwise if the given object is already an instance of
AbstractCRS
, then it is returned unchanged. - Otherwise a new
AbstractCRS
instance is created using the copy constructor and returned. Note that this is a shallow copy operation, because the other properties contained in the given object are not recursively copied.
- Parameters:
object
- the object to get as a SIS implementation, ornull
if none.- Returns:
- a SIS implementation containing the values of the given object (may be the
given object itself), or
null
if the argument was null.
- If the given object is
-
getInterface
Returns the GeoAPI interface implemented by this class. The default implementation returnsCoordinateReferenceSystem.class
. Subclasses implementing a more specific GeoAPI interface shall override this method.- Overrides:
getInterface
in classAbstractReferenceSystem
- Returns:
- the coordinate reference system interface implemented by this class.
-
getCoordinateSystem
Returns the coordinate system.- Specified by:
getCoordinateSystem
in interfaceCoordinateReferenceSystem
- Returns:
- the coordinate system.
-
forConvention
Returns a coordinate reference system equivalent to this one but with axes rearranged according the given convention. If this CRS is already compatible with the given convention, then this method returnsthis
.- Parameters:
convention
- the axes convention for which a coordinate reference system is desired.- Returns:
- a coordinate reference system compatible with the given convention (may be
this
). - See Also:
-
equals
Compares this coordinate reference system with the specified object for equality. If themode
argument value isSTRICT
orBY_CONTRACT
, then all available properties are compared including the domain of validity and the scope.- Specified by:
equals
in interfaceLenientComparable
- Overrides:
equals
in classAbstractIdentifiedObject
- Parameters:
object
- the object to compare tothis
.mode
-STRICT
for performing a strict comparison, orIGNORE_METADATA
for comparing only properties relevant to coordinate transformations.- Returns:
true
if both objects are equal.- See Also:
-
computeHashCode
protected long computeHashCode()Invoked byhashCode()
for computing the hash code when first needed. SeeAbstractIdentifiedObject.computeHashCode()
for more information.- Overrides:
computeHashCode
in classAbstractIdentifiedObject
- Returns:
- the hash code value. This value may change in any future Apache SIS version.
-
formatTo
Formats the inner part of the Well Known Text (WKT) representation of this CRS. The default implementation writes the following elements in WKT 2 format:- The object name.
- The datum, if any.
- All coordinate system's axis.
- The unit if all axes use the same unit, or nothing otherwise.
- Units are formatted before the axes instead of after the axes.
- If no unit can be formatted because not all axes use the same unit, then the WKT is flagged as invalid.
- Overrides:
formatTo
in classAbstractIdentifiedObject
- Parameters:
formatter
- the formatter where to format the inner content of this WKT element.- Returns:
- the CamelCase keyword
for the WKT element, or
null
if unknown. - See Also:
-