InternationalFixedEra.java
/*
* Copyright (c) 2007-present, Stephen Colebourne & Michael Nascimento Santos
*
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package org.threeten.extra.chrono;
import java.time.DateTimeException;
import java.time.chrono.Era;
/**
* An era in the International Fixed calendar system.
* <p>
* The International Fixed calendar system officially only has one era.
* The current era, for years from 1 onwards, is known as 'Current Era'.
* All previous years are invalid.
* <p>
* The start of the International Fixed epoch {@code 0001/01/01 (IFC)} is {@code 0001-01-01 (ISO)}.
* <p>
* <b>Do not use {@code ordinal()} to obtain the numeric representation of {@code InternationalFixedEra}.
* Use {@code getValue()} instead.</b>
*
* <h3>Implementation Requirements:</h3>
* This is an immutable and thread-safe enum.
*/
public enum InternationalFixedEra implements Era {
/**
* The singleton instance for the current era, 'Current Era',
* which has the numeric value 1.
*/
CE;
//-----------------------------------------------------------------------
/**
* Obtains an instance of {@code InternationalFixedEra} from an {@code int} value.
* <p>
* {@code InternationalFixedEra} is an enum representing the International Fixed era of CE.
* This factory allows the enum to be obtained from the {@code int} value.
*
* @param era the CE value to represent, only 1 (CE)
* @return the era singleton, not null
* @throws DateTimeException if the value is invalid
*/
public static InternationalFixedEra of(final int era) {
if (era == 1) {
return CE;
}
throw new DateTimeException("Invalid era: " + era);
}
//-----------------------------------------------------------------------
/**
* Gets the numeric era {@code int} value.
* <p>
* The era CE has the value 1.
*
* @return the era value, only 1 (CE)
*/
@Override
public int getValue() {
return 1;
}
}