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/*

 * 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

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 */

package java.time.chrono;

import java.time.DateTimeException;

/**

 * 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 summary="Minguo years and eras" cellpadding="2" cellspacing="3" border="0" >

 * <thead>

 * <tr class="tableSubHeadingColor">

 * <th class="colFirst" align="left">year-of-era</th>

 * <th class="colFirst" align="left">era</th>

 * <th class="colFirst" align="left">proleptic-year</th>

 * <th class="colLast" align="left">ISO proleptic-year</th>

 * </tr>

 * </thead>

 * <tbody>

 * <tr class="rowColor">

 * <td>2</td><td>ROC</td><td>2</td><td>1913</td>

 * </tr>

 * <tr class="altColor">

 * <td>1</td><td>ROC</td><td>1</td><td>1912</td>

 * </tr>

 * <tr class="rowColor">

 * <td>1</td><td>BEFORE_ROC</td><td>0</td><td>1911</td>

 * </tr>

 * <tr class="altColor">

 * <td>2</td><td>BEFORE_ROC</td><td>-1</td><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();

    }

}