uk.ac.starlink.votable

Class Timesys

java.lang.Object

uk.ac.starlink.votable.Timesys

public class Timesys
extends Object

Utility class for working with VOTable TIMESYS elements.

Since:

26 Apr 2019

Author:

Mark Taylor

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Timesys(double timeorigin, String timescale, String refposition) Constructor.

Method Summary

Modifier and Type	Method and Description
static double	decodeTimeorigin(String txt) Turns the value string found in the TIMESYS/@timeorigin attribute into a numeric value giving JD offset in days.
String	getRefposition() Returns the reference position identifier.
double	getTimeorigin() Returns the numeric value of time origin.
String	getTimescale() Returns the timescale identifier.
static Timesys	getTimesys(ValueInfo info) Extracts a Timesys instance from a ValueInfo.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Timesys

protected Timesys(double timeorigin,
                  String timescale,
                  String refposition)

Constructor.

Parameters:

timeorigin - numeric value of time origin (JD offset); if the timeys doesn't have one, use NaN

timescale - timescale value

refposition - refposition value

Method Detail

getTimeorigin

public double getTimeorigin()

Returns the numeric value of time origin.

Returns:

JD offset in days, or NaN if no time origin

getTimescale

public String getTimescale()

Returns the timescale identifier.

Returns:

timescale

getRefposition

public String getRefposition()

Returns the reference position identifier.

Returns:

refposition

toString

public String toString()

Overrides:

toString in class Object

Returns:

human-readable summary of timesys.

decodeTimeorigin

public static double decodeTimeorigin(String txt)
                               throws NumberFormatException

Turns the value string found in the TIMESYS/@timeorigin attribute into a numeric value giving JD offset in days. If the text is not legal for the timeorigin attribute, a NumberFormatException will be thrown.

Parameters:

txt - timeorigin attribute value

Returns:

numeric offset value

Throws:

NumberFormatException - if the value is not one of the magic strings and is not a valid numerical representation

getTimesys

public static Timesys getTimesys(ValueInfo info)

Extracts a Timesys instance from a ValueInfo. If the metadata contains insufficient or incorrect information to define a Timesys, null is returned.

Parameters:

info - value metadata

Returns:

timesys instance or null