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	/*
	* Copyright (c) 2012, 2017, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	/*
	* This file is available under and governed by the GNU General Public
	* License version 2 only, as published by the Free Software Foundation.
	* However, the following notice accompanied the original version of this
	* file:
	*
	* Copyright (c) 2012, 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
	* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
	* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
	* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
	* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/
	package java.time.chrono;

	import static java.time.temporal.ChronoField.ERA;

	import java.time.DateTimeException;
	import java.time.format.DateTimeFormatterBuilder;
	import java.time.format.TextStyle;
	import java.util.Locale;

	/**
	* An era in the Minguo calendar system.
	* <p>
	* The Minguo calendar system has two eras.
	* The current era, for years from 1 onwards, is known as the 'Republic of China' era.
	* 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 Republic of China' era.
	*
	* <table class="striped" style="text-align:left">
	* <caption style="display:none">Minguo years and eras</caption>
	* <thead>
	* <tr>
	* <th>year-of-era</th>
	* <th>era</th>
	* <th>proleptic-year</th>
	* <th>ISO proleptic-year</th>
	* </tr>
	* </thead>
	* <tbody>
	* <tr>
	* <td>2</td><td>ROC</td><th scope="row">2</th><td>1913</td>
	* </tr>
	* <tr>
	* <td>1</td><td>ROC</td><th scope="row">1</th><td>1912</td>
	* </tr>
	* <tr>
	* <td>1</td><td>BEFORE_ROC</td><th scope="row">0</th><td>1911</td>
	* </tr>
	* <tr>
	* <td>2</td><td>BEFORE_ROC</td><th scope="row">-1</th><td>1910</td>
	* </tr>
	* </tbody>
	* </table>
	* <p>
	* <b>Do not use {@code ordinal()} to obtain the numeric representation of {@code MinguoEra}.
	* Use {@code getValue()} instead.</b>
	*
	* @implSpec
	* This is an immutable and thread-safe enum.
	*
	* @since 1.8
	*/
	public enum MinguoEra implements Era {

	/**
	* The singleton instance for the era before the current one, 'Before Republic of China Era',
	* which has the numeric value 0.
	*/
	BEFORE_ROC,
	/**
	* The singleton instance for the current era, 'Republic of China Era',
	* which has the numeric value 1.
	*/
	ROC;

	//-----------------------------------------------------------------------
	/**
	* Obtains an instance of {@code MinguoEra} from an {@code int} value.
	* <p>
	* {@code MinguoEra} is an enum representing the Minguo eras of BEFORE_ROC/ROC.
	* This factory allows the enum to be obtained from the {@code int} value.
	*
	* @param minguoEra the BEFORE_ROC/ROC value to represent, from 0 (BEFORE_ROC) to 1 (ROC)
	* @return the era singleton, not null
	* @throws DateTimeException if the value is invalid
	*/
	public static MinguoEra of(int minguoEra) {
	switch (minguoEra) {
	case 0:
	return BEFORE_ROC;
	case 1:
	return ROC;
	default:
	throw new DateTimeException("Invalid era: " + minguoEra);
	}
	}

	//-----------------------------------------------------------------------
	/**
	* Gets the numeric era {@code int} value.
	* <p>
	* The era BEFORE_ROC has the value 0, while the era ROC has the value 1.
	*
	* @return the era value, from 0 (BEFORE_ROC) to 1 (ROC)
	*/
	@Override
	public int getValue() {
	return ordinal();
	}

	/**
	* {@inheritDoc}
	*
	* @param style {@inheritDoc}
	* @param locale {@inheritDoc}
	*/
	@Override
	public String getDisplayName(TextStyle style, Locale locale) {
	return new DateTimeFormatterBuilder()
	.appendText(ERA, style)
	.toFormatter(locale)
	.withChronology(MinguoChronology.INSTANCE)
	.format(this == ROC ? MinguoDate.of(1, 1, 1) : MinguoDate.of(0, 1, 1));
	}

	}

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