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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 Thai Buddhist calendar system.

 * <p>

 * The Thai Buddhist calendar system has two eras.

 * The current era, for years from 1 onwards, is known as the 'Buddhist' 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 Buddhist' era.

 *

 * <table summary="Buddhist 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>BE</td><td>2</td><td>-542</td>

 * </tr>

 * <tr class="altColor">

 * <td>1</td><td>BE</td><td>1</td><td>-543</td>

 * </tr>

 * <tr class="rowColor">

 * <td>1</td><td>BEFORE_BE</td><td>0</td><td>-544</td>

 * </tr>

 * <tr class="altColor">

 * <td>2</td><td>BEFORE_BE</td><td>-1</td><td>-545</td>

 * </tr>

 * </tbody>

 * </table>

 * <p>

 * <b>Do not use {@code ordinal()} to obtain the numeric representation of {@code ThaiBuddhistEra}.

 * Use {@code getValue()} instead.</b>

 *

 * @implSpec

 * This is an immutable and thread-safe enum.

 *

 * @since 1.8

 */

public enum ThaiBuddhistEra implements Era {

    /**

     * The singleton instance for the era before the current one, 'Before Buddhist Era',

     * which has the numeric value 0.

     */

    BEFORE_BE,

    /**

     * The singleton instance for the current era, 'Buddhist Era',

     * which has the numeric value 1.

     */

    BE;

    //-----------------------------------------------------------------------

    /**

     * Obtains an instance of {@code ThaiBuddhistEra} from an {@code int} value.

     * <p>

     * {@code ThaiBuddhistEra} is an enum representing the Thai Buddhist eras of BEFORE_BE/BE.

     * This factory allows the enum to be obtained from the {@code int} value.

     *

     * @param thaiBuddhistEra  the era to represent, from 0 to 1

     * @return the BuddhistEra singleton, never null

     * @throws DateTimeException if the era is invalid

     */

    public static ThaiBuddhistEra of(int thaiBuddhistEra) {

        switch (thaiBuddhistEra) {

            case 0:

                return BEFORE_BE;

            case 1:

                return BE;

            default:

                throw new DateTimeException("Invalid era: " + thaiBuddhistEra);

        }

    }

    //-----------------------------------------------------------------------

    /**

     * Gets the numeric era {@code int} value.

     * <p>

     * The era BEFORE_BE has the value 0, while the era BE has the value 1.

     *

     * @return the era value, from 0 (BEFORE_BE) to 1 (BE)

     */

    @Override

    public int getValue() {

        return ordinal();

    }

}