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26/*
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28 * License version 2 only, as published by the Free Software Foundation.
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30 * file:
31 *
32 * Copyright (c) 2012, Stephen Colebourne & Michael Nascimento Santos
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61 */
62package java.time.chrono;
63
64import java.time.DateTimeException;
65
66/**
67 * An era in the Thai Buddhist calendar system.
68 * <p>
69 * The Thai Buddhist calendar system has two eras.
70 * The current era, for years from 1 onwards, is known as the 'Buddhist' era.
71 * All previous years, zero or earlier in the proleptic count or one and greater
72 * in the year-of-era count, are part of the 'Before Buddhist' era.
73 *
74 * <table class="striped">
75 * <caption style="display:none">Buddhist years and eras</caption>
76 * <thead>
77 * <tr>
78 * <th style="text-align:left">year-of-era</th>
79 * <th style="text-align:left">era</th>
80 * <th style="text-align:left">proleptic-year</th>
81 * <th style="text-align:left">ISO proleptic-year</th>
82 * </tr>
83 * </thead>
84 * <tbody>
85 * <tr>
86 * <td>2</td><td>BE</td><td>2</td><td>-542</td>
87 * </tr>
88 * <tr>
89 * <td>1</td><td>BE</td><td>1</td><td>-543</td>
90 * </tr>
91 * <tr>
92 * <td>1</td><td>BEFORE_BE</td><td>0</td><td>-544</td>
93 * </tr>
94 * <tr>
95 * <td>2</td><td>BEFORE_BE</td><td>-1</td><td>-545</td>
96 * </tr>
97 * </tbody>
98 * </table>
99 * <p>
100 * <b>Do not use {@code ordinal()} to obtain the numeric representation of {@code ThaiBuddhistEra}.
101 * Use {@code getValue()} instead.</b>
102 *
103 * @implSpec
104 * This is an immutable and thread-safe enum.
105 *
106 * @since 1.8
107 */
108public enum ThaiBuddhistEra implements Era {
109
110    /**
111     * The singleton instance for the era before the current one, 'Before Buddhist Era',
112     * which has the numeric value 0.
113     */
114    BEFORE_BE,
115    /**
116     * The singleton instance for the current era, 'Buddhist Era',
117     * which has the numeric value 1.
118     */
119    BE;
120
121    //-----------------------------------------------------------------------
122    /**
123     * Obtains an instance of {@code ThaiBuddhistEra} from an {@code int} value.
124     * <p>
125     * {@code ThaiBuddhistEra} is an enum representing the Thai Buddhist eras of BEFORE_BE/BE.
126     * This factory allows the enum to be obtained from the {@code int} value.
127     *
128     * @param thaiBuddhistEra  the era to represent, from 0 to 1
129     * @return the BuddhistEra singleton, never null
130     * @throws DateTimeException if the era is invalid
131     */
132    public static ThaiBuddhistEra of(int thaiBuddhistEra) {
133        switch (thaiBuddhistEra) {
134            case 0:
135                return BEFORE_BE;
136            case 1:
137                return BE;
138            default:
139                throw new DateTimeException("Invalid era: " + thaiBuddhistEra);
140        }
141    }
142
143    //-----------------------------------------------------------------------
144    /**
145     * Gets the numeric era {@code int} value.
146     * <p>
147     * The era BEFORE_BE has the value 0, while the era BE has the value 1.
148     *
149     * @return the era value, from 0 (BEFORE_BE) to 1 (BE)
150     */
151    @Override
152    public int getValue() {
153        return ordinal();
154    }
155
156}
157