Package org.apache.sis.referencing.crs

Class AbstractCRS

Object

FormattableObject

AbstractIdentifiedObject

AbstractReferenceSystem

AbstractCRS

All Implemented Interfaces:

Serializable, Deprecable, Lenient­Comparable, Coordinate­Reference­System, Identified­Object, Reference­System

Direct Known Subclasses:

Default­Compound­CRS, Default­Derived­CRS, Default­Engineering­CRS, Default­Geocentric­CRS, Default­Geographic­CRS, Default­Image­CRS, Default­Parametric­CRS, Default­Projected­CRS, Default­Temporal­CRS, Default­Vertical­CRS

public class AbstractCRS
extends AbstractReferenceSystem
implements CoordinateReferenceSystem

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.

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();

However most subclasses restrict the allowed number of dimensions.

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 by Default 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:

Abstract­CS, Abstract­Datum, Serialized Form

Defined in the sis-referencing module

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

Constructors

Modifier	Constructor	Description
	AbstractCRS(Map<String,?> properties, CoordinateSystem cs)	Creates a coordinate reference system from the given properties and coordinate system.
protected	AbstractCRS(CoordinateReferenceSystem crs)	Constructs a new coordinate reference system with the same values than the specified one.

Method Summary

Modifier and Type	Method	Description
static AbstractCRS	castOrCopy(CoordinateReferenceSystem object)	Returns a SIS coordinate reference system implementation with the values of the given arbitrary implementation.
protected long	computeHashCode()	Invoked by hash­Code() 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.
AbstractCRS	forConvention(AxesConvention convention)	Returns a coordinate reference system equivalent to this one but with axes rearranged according the given convention.
protected String	formatTo(Formatter formatter)	Formats the inner part of the Well Known Text (WKT) representation of this CRS.
CoordinateSystem	getCoordinateSystem()	Returns the coordinate system.
Class<? extends CoordinateReferenceSystem>	getInterface()	Returns the GeoAPI interface implemented by this class.

Methods inherited from class AbstractReferenceSystem

get­Domain­Of­Validity, get­Scope

Methods inherited from class AbstractIdentifiedObject

cast­Or­Copy, equals, get­Alias, get­Description, 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 Detail

AbstractCRS

public AbstractCRS(Map<String,?> properties,
                   CoordinateSystem cs)

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 or String	AbstractIdentifiedObject.getName()
"alias"	GenericName or Char­Sequence (optionally as array)	AbstractIdentifiedObject.getAlias()
"identifiers"	ReferenceIdentifier (optionally as array)	AbstractIdentifiedObject.getIdentifiers()
"remarks"	InternationalString or String	AbstractIdentifiedObject.getRemarks()
"domainOfValidity"	Extent	AbstractReferenceSystem.getDomainOfValidity()
"scope"	InternationalString or String	AbstractReferenceSystem.getScope()

Parameters:

properties - the properties to be given to the coordinate reference system.

cs - the coordinate system.

AbstractCRS

protected AbstractCRS(CoordinateReferenceSystem crs)

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:

cast­Or­Copy(Coordinate­Reference­System)

Method Detail

castOrCopy

public static AbstractCRS castOrCopy(CoordinateReferenceSystem object)

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 returns null.
• Otherwise if the given object is an instance of Geodetic­CRS (including the Geographic­CRS and Geocentric­CRS subtypes), Vertical­CRS, Temporal­CRS, Engineering­CRS, Image­CRS or Default­Compound­CS, then this method delegates to the cast­Or­Copy(…) method of the corresponding SIS subclass. Note that if the given object implements more than one of the above-cited interfaces, then the cast­Or­Copy(…) 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, since the other properties contained in the given object are not recursively copied.

Parameters:

object - the object to get as a SIS implementation, or null 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.

getInterface

public Class<? extends CoordinateReferenceSystem> getInterface()

Returns the GeoAPI interface implemented by this class. The default implementation returns Coordinate­Reference­System.class. Subclasses implementing a more specific GeoAPI interface shall override this method.

Overrides:

get­Interface in class Abstract­Reference­System

Returns:

the coordinate reference system interface implemented by this class.

getCoordinateSystem

public CoordinateSystem getCoordinateSystem()

Returns the coordinate system.

Specified by:

get­Coordinate­System in interface Coordinate­Reference­System

Returns:

the coordinate system.

forConvention

public AbstractCRS forConvention(AxesConvention convention)

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 returns this.

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:

Abstract­CS.for­Convention(Axes­Convention)

equals

public boolean equals(Object object,
                      ComparisonMode mode)

Compares this coordinate reference system with the specified object for equality. If the mode argument value is STRICT or BY_CONTRACT, then all available properties are compared including the domain of validity and the scope.

Specified by:

equals in interface Lenient­Comparable

Overrides:

equals in class Abstract­Reference­System

Parameters:

object - the object to compare to this.

mode - STRICT for performing a strict comparison, or IGNORE_METADATA for comparing only properties relevant to coordinate transformations.

Returns:

true if both objects are equal.

See Also:

Abstract­Identified­Object.compute­Hash­Code(), Utilities.deep­Equals(Object, Object, Comparison­Mode)

computeHashCode

protected long computeHashCode()

Invoked by hash­Code() for computing the hash code when first needed. See Abstract­Identified­Object.compute­Hash­Code() for more information.

Overrides:

compute­Hash­Code in class Abstract­Reference­System

Returns:

the hash code value. This value may change in any future Apache SIS version.

formatTo

protected String formatTo(Formatter formatter)

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.

The WKT 1 format is similar to the WKT 2 one with two differences:

• Units are formatted before the axes instead than 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 class Abstract­Identified­Object

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:

WKT 2 specification, Legacy WKT 1