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* Copyright (c) 2012, Stephen Colebourne & Michael Nascimento Santos
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package java.time.chrono;
import java.time.DateTimeException;
An era in the ISO calendar system.
The ISO-8601 standard does not define eras.
A definition has therefore been created with two eras - 'Current era' (CE) for
years on or after 0001-01-01 (ISO), and 'Before current era' (BCE) for years before that.
ISO years and eras
year-of-era
era
proleptic-year
2 CE 2
1 CE 1
1 BCE 0
2 BCE -1
Do not use ordinal() to obtain the numeric representation of IsoEra. Use getValue() instead.
Implementation Requirements:
This is an immutable and thread-safe enum. Since: 1.8
/**
* An era in the ISO calendar system.
* <p>
* The ISO-8601 standard does not define eras.
* A definition has therefore been created with two eras - 'Current era' (CE) for
* years on or after 0001-01-01 (ISO), and 'Before current era' (BCE) for years before that.
*
* <table class="striped" style="text-align:left">
* <caption style="display:none">ISO years and eras</caption>
* <thead>
* <tr>
* <th scope="col">year-of-era</th>
* <th scope="col">era</th>
* <th scope="col">proleptic-year</th>
* </tr>
* </thead>
* <tbody>
* <tr>
* <td>2</td><td>CE</td><th scope="row">2</th>
* </tr>
* <tr>
* <td>1</td><td>CE</td><th scope="row">1</th>
* </tr>
* <tr>
* <td>1</td><td>BCE</td><th scope="row">0</th>
* </tr>
* <tr>
* <td>2</td><td>BCE</td><th scope="row">-1</th>
* </tr>
* </tbody>
* </table>
* <p>
* <b>Do not use {@code ordinal()} to obtain the numeric representation of {@code IsoEra}.
* Use {@code getValue()} instead.</b>
*
* @implSpec
* This is an immutable and thread-safe enum.
*
* @since 1.8
*/
public enum IsoEra implements Era {
The singleton instance for the era before the current one, 'Before Current Era',
which has the numeric value 0.
/**
* The singleton instance for the era before the current one, 'Before Current Era',
* which has the numeric value 0.
*/
BCE,
The singleton instance for the current era, 'Current Era',
which has the numeric value 1.
/**
* The singleton instance for the current era, 'Current Era',
* which has the numeric value 1.
*/
CE;
//-----------------------------------------------------------------------
Obtains an instance of IsoEra from an int value. IsoEra is an enum representing the ISO eras of BCE/CE. This factory allows the enum to be obtained from the int value.
Params: - isoEra – the BCE/CE value to represent, from 0 (BCE) to 1 (CE)
Throws: - DateTimeException – if the value is invalid
Returns: the era singleton, not null
/**
* Obtains an instance of {@code IsoEra} from an {@code int} value.
* <p>
* {@code IsoEra} is an enum representing the ISO eras of BCE/CE.
* This factory allows the enum to be obtained from the {@code int} value.
*
* @param isoEra the BCE/CE value to represent, from 0 (BCE) to 1 (CE)
* @return the era singleton, not null
* @throws DateTimeException if the value is invalid
*/
public static IsoEra of(int isoEra) {
switch (isoEra) {
case 0:
return BCE;
case 1:
return CE;
default:
throw new DateTimeException("Invalid era: " + isoEra);
}
}
//-----------------------------------------------------------------------
Gets the numeric era int value.
The era BCE has the value 0, while the era CE has the value 1.
Returns: the era value, from 0 (BCE) to 1 (CE)
/**
* Gets the numeric era {@code int} value.
* <p>
* The era BCE has the value 0, while the era CE has the value 1.
*
* @return the era value, from 0 (BCE) to 1 (CE)
*/
@Override
public int getValue() {
return ordinal();
}
}