Package org.apache.sis.referencing.datum

Class DefaultTemporalDatum

Object

FormattableObject

AbstractIdentifiedObject

AbstractDatum

DefaultTemporalDatum

All Implemented Interfaces:

Serializable, Deprecable, Lenient­Comparable, Datum, Temporal­Datum, Identified­Object

public class DefaultTemporalDatum
extends AbstractDatum
implements TemporalDatum

Defines the origin of a temporal coordinate reference system.

Creating new temporal datum 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). Choice 1 in the following list is the easiest but most restrictive way to get a temporal datum. The other choices provide more freedom.

1. Create a Temporal­Datum from one of the static convenience shortcuts listed in Common­CRS.Temporal.datum().
2. Create a Temporal­Datum from an identifier in a database by invoking Datum­Authority­Factory.create­Temporal­Datum(String).
3. Create a Temporal­Datum by invoking the Datum­Factory.create­Temporal­Datum(…) method, (implemented for example by Geodetic­Object­Factory).
4. Create a Default­Temporal­Datum by invoking the constructor.

Example: the following code gets a temporal datum having its origin at January 1st, 4713 BC at 12:00 UTC:

TemporalDatum datum = CommonCRS.Temporal.JULIAN.datum();

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:

Common­CRS.Temporal.datum(), Default­Time­CS, Default­Temporal­CRS, Geodetic­Authority­Factory.create­Temporal­Datum(String), Serialized Form

Defined in the sis-referencing module

Field Summary

Fields inherited from class AbstractIdentifiedObject

DEPRECATED_KEY, LOCALE_KEY

Fields inherited from interface Datum

ANCHOR_POINT_KEY, DOMAIN_OF_VALIDITY_KEY, REALIZATION_EPOCH_KEY, SCOPE_KEY

Fields inherited from interface IdentifiedObject

ALIAS_KEY, IDENTIFIERS_KEY, NAME_KEY, REMARKS_KEY

Constructor Summary

Constructors

Modifier	Constructor	Description
	DefaultTemporalDatum(Map<String,?> properties, Date origin)	Creates a temporal datum from the given properties.
protected	DefaultTemporalDatum(TemporalDatum datum)	Creates a new datum with the same values than the specified one.

Method Summary

Modifier and Type	Method	Description
static DefaultTemporalDatum	castOrCopy(TemporalDatum object)	Returns a SIS datum implementation with the same values than 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 temporal datum with the specified object for equality.
protected String	formatTo(Formatter formatter)	Formats this datum as a Well Known Text Time­Datum[…] element.
Class<? extends TemporalDatum>	getInterface()	Returns the GeoAPI interface implemented by this class.
Date	getOrigin()	Returns the date and time origin of this temporal datum.

Methods inherited from class AbstractDatum

cast­Or­Copy, get­Anchor­Point, get­Domain­Of­Validity, get­Realization­Epoch, get­Scope, is­Heuristic­Match­For­Name

Methods inherited from class AbstractIdentifiedObject

cast­Or­Copy, equals, get­Alias, get­Description, get­Identifiers, get­Name, get­Remarks, hash­Code, is­Deprecated

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 Datum

get­Domain­Of­Validity, get­Scope

Methods inherited from interface IdentifiedObject

get­Alias, get­Identifiers, get­Name, get­Remarks, to­WKT

Methods inherited from interface TemporalDatum

get­Anchor­Point, get­Realization­Epoch

Constructor Detail

DefaultTemporalDatum

public DefaultTemporalDatum(Map<String,?> properties,
                            Date origin)

Creates a temporal datum 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"	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()
"anchorPoint"	InternationalString or String	AbstractDatum.getAnchorPoint()
"realizationEpoch"	Date	AbstractDatum.getRealizationEpoch()
"domainOfValidity"	Extent	AbstractDatum.getDomainOfValidity()
"scope"	InternationalString or String	AbstractDatum.getScope()

Parameters:

properties - the properties to be given to the identified object.

origin - the date and time origin of this temporal datum.

See Also:

Geodetic­Object­Factory.create­Temporal­Datum(Map, Date)

DefaultTemporalDatum

protected DefaultTemporalDatum(TemporalDatum datum)

Creates a new datum 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:

datum - the datum to copy.

See Also:

cast­Or­Copy(Temporal­Datum)

Method Detail

castOrCopy

public static DefaultTemporalDatum castOrCopy(TemporalDatum object)

Returns a SIS datum implementation with the same values than the given arbitrary implementation. If the given object is null, then this method returns null. 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 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 TemporalDatum> getInterface()

Returns the GeoAPI interface implemented by this class. The SIS implementation returns Temporal­Datum.class.

Note for implementers: Subclasses usually do not need to override this method since GeoAPI does not define Temporal­Datum sub-interface. Overriding possibility is left mostly for implementers who wish to extend GeoAPI with their own set of interfaces.

Overrides:

get­Interface in class Abstract­Datum

Returns:

Temporal­Datum.class or a user-defined sub-interface.

getOrigin

public Date getOrigin()

Returns the date and time origin of this temporal datum.

Specified by:

get­Origin in interface Temporal­Datum

Returns:

the date and time origin of this temporal datum.

equals

public boolean equals(Object object,
                      ComparisonMode mode)

Compares this temporal datum with the specified object for equality.

Specified by:

equals in interface Lenient­Comparable

Overrides:

equals in class Abstract­Datum

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 Abstract­Datum

Returns:

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

formatTo

protected String formatTo(Formatter formatter)

Formats this datum as a Well Known Text Time­Datum[…] element.

Compatibility note: Time­Datum is defined in the WKT 2 specification only.

Overrides:

format­To in class Abstract­Datum

Parameters:

formatter - the formatter where to format the inner content of this WKT element.

Returns:

"Time­Datum".

See Also:

WKT 2 specification §14.2