Class AbstractCRS

Object

FormattableObject

AbstractIdentifiedObject

AbstractReferenceSystem

AbstractCRS

All Implemented Interfaces:

Serializable, Formattable, Deprecable, Lenient­Comparable, Printable, Coordinate­Reference­System, Identified­Object, Reference­System

Direct Known Subclasses:

Default­Compound­CRS, Default­Derived­CRS, Default­Engineering­CRS, Default­Geocentric­CRS, Default­Geographic­CRS, 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

Field Summary

Fields inherited from class AbstractIdentifiedObject

DEPRECATED_KEY, DOMAINS_KEY, LOCALE_KEY

Modifier and Type	Field	Description
static final String	DEPRECATED_KEY	Optional key which can be given to the constructor for specifying the object is deprecated.
static final String	DOMAINS_KEY	Key for the "domains" property to be given to the Object­Factory.create­Foo(Map, ...) methods.
static final String	LOCALE_KEY	Optional key which can be given to the constructor for specifying the locale to use for producing error messages.

Fields inherited from interface IdentifiedObject

ALIAS_KEY, IDENTIFIERS_KEY, NAME_KEY, REMARKS_KEY

Modifier and Type	Field	Description
static final String	ALIAS_KEY	Key for the "alias" property to be given to the object factory create­Foo(…) methods.
static final String	IDENTIFIERS_KEY	Key for the "identifiers" property to be given to the object factory create­Foo(…) methods.
static final String	NAME_KEY	Key for the "name" property to be given to the object factory create­Foo(…) methods.
static final String	REMARKS_KEY	Key for the "remarks" property to be given to the object factory create­Foo(…) methods.

Fields inherited from interface ReferenceSystem

DOMAIN_OF_VALIDITY_KEY, SCOPE_KEY

Modifier and Type	Field	Description
static final String	DOMAIN_OF_VALIDITY_KEY	Key for the "domain­Of­Validity" property to be given to the object factory create­Foo(…) methods.
static final String	SCOPE_KEY	Key for the "scope" property to be given to the object factory create­Foo(…) methods.

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 as 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.
boolean	equals(Object object, Comparison­Mode mode)	Compares this coordinate reference system with the specified object for equality.
Abstract­CRS	for­Convention(Axes­Convention convention)	Returns a CRS 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.
Type	get­Standard­Type()	Returns the GeoAPI interface that defines the contract of this implementation class.

Methods inherited from class AbstractReferenceSystem

get­Domain­Of­Validity, get­Scope

Modifier and Type	Method	Description
Extent	get­Domain­Of­Validity()	Deprecated. Replaced by Abstract­Identified­Object.get­Domains() as of ISO 19111:2019.
International­String	get­Scope()	Deprecated. Replaced by Abstract­Identified­Object.get­Domains() as of ISO 19111:2019.

Methods inherited from class AbstractIdentifiedObject

cast­Or­Copy, equals, format­To, get­Alias, get­Description, get­Domains, get­Identifiers, get­Interface, get­Name, get­Remarks, hash­Code, is­Deprecated, is­Heuristic­Match­For­Name

Modifier and Type	Method	Description
static Abstract­Identified­Object	cast­Or­Copy(Identified­Object object)	Returns a SIS identified object implementation with the values of the given arbitrary implementation.
final boolean	equals(Object object)	Compares the specified object with this object for equality.
void	format­To(Formatter formatter, int flags, int width, int precision)	Formats the name or identifier of this object using the provider formatter.
Collection<Generic­Name>	get­Alias()	Returns alternative names by which this object is identified.
Optional<International­String>	get­Description()	Returns a narrative explanation of the role of this object.
Collection<Default­Object­Domain>	get­Domains()	Returns the usage of this CRS-related object.
Set<Reference­Identifier>	get­Identifiers()	Returns identifiers which references elsewhere the object's defining information.
final Class<? extends Identified­Object>	get­Interface()	Deprecated, for removal: This API element is subject to removal in a future version. Renamed Abstract­Identified­Object.get­Standard­Type() for integration with Lenient­Comparable.
Reference­Identifier	get­Name()	Returns the primary name by which this object is identified.
International­String	get­Remarks()	Returns comments on or information about this object, including data source information.
final int	hash­Code()	Returns a hash value for this identified object.
boolean	is­Deprecated()	Returns true if this object is deprecated.
boolean	is­Heuristic­Match­For­Name(String name)	Returns true if either the primary name or at least one alias matches the given string according heuristic rules.

Methods inherited from class FormattableObject

print, to­String, to­String, to­WKT

Modifier and Type	Method	Description
void	print()	Prints a string representation of this object to the standard output stream.
String	to­String()	Returns a Well Known Text (WKT) or an alternative text representation for this object.
String	to­String(Convention convention)	Returns a Well Known Text (WKT) for this object using the specified convention.
String	to­WKT()	Returns a strictly compliant Well Known Text (WKT) using the default convention, symbols and indentation.

Methods inherited from class Object

clone, finalize, get­Class, notify, notify­All, wait, wait, wait

Methods inherited from interface IdentifiedObject

to­WKT

Modifier and Type	Method	Description
String	to­WKT()	Returns a Well Known Text (WKT) for this object.

Constructor Details

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 as 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()
"domains"	DefaultObjectDomain (optionally as array)	AbstractIdentifiedObject.getDomains()
"remarks"	InternationalString or String	AbstractIdentifiedObject.getRemarks()

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 as 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 Details

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, because 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.

getStandardType

public Type getStandardType()

Returns the GeoAPI interface that defines the contract of this implementation class. The default implementation returns Coordinate­Reference­System.class. Subclasses implementing a more specific GeoAPI interface shall override this method.

Specified by:

get­Standard­Type in interface Lenient­Comparable

Overrides:

get­Standard­Type in class Abstract­Reference­System

Returns:

the coordinate reference system interface implemented by this class.

Since:

1.7

See Also:

• Comparison­Mode.BY_CONTRACT
• Classes.get­Raw­Class(Type)
• Classes.get­Standard­Class(Object, 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 CRS 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 domains and remarks.

Specified by:

equals in interface Lenient­Comparable

Overrides:

equals in class Abstract­Identified­Object

Parameters:

object - the object to compare to this.

mode - the strictness level of the comparison.

Returns:

true if both objects are equal.

See Also:

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

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 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 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:

• Formattable­Object.to­WKT()
• Formattable­Object.to­String()