Module org.apache.sis.referencing

Package org.apache.sis.referencing.datum

Class DefaultImageDatum

Object

FormattableObject

AbstractIdentifiedObject

AbstractDatum

DefaultImageDatum

All Implemented Interfaces:

Serializable, Formattable, Deprecable, Lenient­Comparable, Datum, Image­Datum, Identified­Object

public class DefaultImageDatum
extends AbstractDatum
implements ImageDatum

Defines the origin of an image coordinate reference system. An image datum is used in a local context only. For an image datum, the anchor point is usually either the centre of the image or the corner of the image.

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:

• Default­Image­CRS
• Geodetic­Authority­Factory.create­Image­Datum(String)
• Serialized Form

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
	Default­Image­Datum(Map<String,?> properties, Pixel­In­Cell pixel­In­Cell)	Creates an image datum from the given properties.
protected	Default­Image­Datum(Image­Datum datum)	Creates a new datum with the same values than the specified one.

Method Summary

Modifier and Type	Method	Description
static Default­Image­Datum	cast­Or­Copy(Image­Datum 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 datum with the specified object for equality.
protected String	format­To(Formatter formatter)	Formats this datum as a Well Known Text Image­Datum[…] element.
Class<? extends Image­Datum>	get­Interface()	Returns the GeoAPI interface implemented by this class.
Pixel­In­Cell	get­Pixel­In­Cell()	Specification of the way the image grid is associated with the image data attributes.

Methods inherited from class AbstractDatum

cast­Or­Copy, get­Anchor­Point, get­Domain­Of­Validity, get­Realization­Epoch, get­Scope, is­Heuristic­Match­For­Name

Methods inherited from class AbstractIdentifiedObject

cast­Or­Copy, equals, format­To, get­Alias, get­Description, get­Domains, 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

get­Anchor­Point, get­Domain­Of­Validity, get­Realization­Epoch, get­Scope

Methods inherited from interface IdentifiedObject

get­Alias, get­Identifiers, get­Name, get­Remarks, to­WKT

Constructor Details

DefaultImageDatum

public DefaultImageDatum(Map<String,?> properties,
 PixelInCell pixelInCell)

Creates an image 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()
"domains"	DefaultObjectDomain (optionally as array)	AbstractIdentifiedObject.getDomains()
"remarks"	InternationalString or String	AbstractIdentifiedObject.getRemarks()
"anchorPoint"	InternationalString or String	AbstractDatum.getAnchorPoint()
"realizationEpoch"	Date	AbstractDatum.getRealizationEpoch()

Parameters:

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

pixel­In­Cell - the way the image grid is associated with the image data attributes.

See Also:

• Geodetic­Object­Factory.create­Image­Datum(Map, Pixel­In­Cell)

DefaultImageDatum

protected DefaultImageDatum(ImageDatum 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(Image­Datum)

Method Details

castOrCopy

public static DefaultImageDatum castOrCopy(ImageDatum 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 ImageDatum> getInterface()

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

Note for implementers

Subclasses usually do not need to override this method since GeoAPI does not define Image­Datum 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:

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

getPixelInCell

public PixelInCell getPixelInCell()

Specification of the way the image grid is associated with the image data attributes.

Specified by:

get­Pixel­In­Cell in interface Image­Datum

Returns:

the way image grid is associated with image data attributes.

equals

public boolean equals(Object object,
 ComparisonMode mode)

Compares this 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 Abstract­Identified­Object

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 Image­Datum[…] element.

Compatibility note

Image­Datum 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:

"Image­Datum".

See Also:

• WKT 2 specification §12.2