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/*
* Copyright (c) 2007-present, Stephen Colebourne & Michael Nascimento Santos
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* * Neither the name of JSR-310 nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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*/
package org.threeten.extra.chrono;
import java.time.DateTimeException;
import java.time.chrono.Era;
/**
* An era in the Julian calendar system.
*
* The Julian calendar system has two eras.
* The current era, for years from 1 onwards, is known as 'Anno Domini'.
* All previous years, zero or earlier in the proleptic count or one and greater
* in the year-of-era count, are part of the 'Before Christ' era.
*
* The start of the Julian epoch {@code 0001-01-01 (Julian)} is {@code 0000-12-30 (ISO)}.
*
* Do not use {@code ordinal()} to obtain the numeric representation of {@code JulianEra}.
* Use {@code getValue()} instead.
*
*
Implementation Requirements:
* This is an immutable and thread-safe enum.
*/
public enum JulianEra implements Era {
/**
* The singleton instance for the era before the current one, 'Before Christ',
* which has the numeric value 0.
*/
BC,
/**
* The singleton instance for the current era, 'Anno Domini',
* which has the numeric value 1.
*/
AD;
//-----------------------------------------------------------------------
/**
* Obtains an instance of {@code JulianEra} from an {@code int} value.
*
* {@code JulianEra} is an enum representing the Julian eras of BC/AD.
* This factory allows the enum to be obtained from the {@code int} value.
*
* @param era the BC/AD value to represent, from 0 (BC) to 1 (AD)
* @return the era singleton, not null
* @throws DateTimeException if the value is invalid
*/
public static JulianEra of(int era) {
switch (era) {
case 0:
return BC;
case 1:
return AD;
default:
throw new DateTimeException("Invalid era: " + era);
}
}
//-----------------------------------------------------------------------
/**
* Gets the numeric era {@code int} value.
*
* The era BC has the value 0, while the era AD has the value 1.
*
* @return the era value, from 0 (BC) to 1 (AD)
*/
@Override
public int getValue() {
return ordinal();
}
}