META-INF.modules.java.base.classes.java.time.chrono.HijrahEra Maven / Gradle / Ivy
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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
*
* All rights reserved.
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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.time.temporal.ChronoField;
import java.time.temporal.TemporalField;
import java.time.temporal.UnsupportedTemporalTypeException;
import java.time.temporal.ValueRange;
import java.util.Locale;
/**
* An era in the Hijrah calendar system.
*
* The Hijrah calendar system has only one era covering the
* proleptic years greater than zero.
*
* Do not use {@code ordinal()} to obtain the numeric representation of {@code HijrahEra}.
* Use {@code getValue()} instead.
*
* @implSpec
* This is an immutable and thread-safe enum.
*
* @since 1.8
*/
public enum HijrahEra implements Era {
/**
* The singleton instance for the current era, 'Anno Hegirae',
* which has the numeric value 1.
*/
AH;
//-----------------------------------------------------------------------
/**
* Obtains an instance of {@code HijrahEra} from an {@code int} value.
*
* The current era, which is the only accepted value, has the value 1
*
* @param hijrahEra the era to represent, only 1 supported
* @return the HijrahEra.AH singleton, not null
* @throws DateTimeException if the value is invalid
*/
public static HijrahEra of(int hijrahEra) {
if (hijrahEra == 1 ) {
return AH;
} else {
throw new DateTimeException("Invalid era: " + hijrahEra);
}
}
//-----------------------------------------------------------------------
/**
* Gets the numeric era {@code int} value.
*
* The era AH has the value 1.
*
* @return the era value, 1 (AH)
*/
@Override
public int getValue() {
return 1;
}
//-----------------------------------------------------------------------
/**
* Gets the range of valid values for the specified field.
*
* The range object expresses the minimum and maximum valid values for a field.
* This era is used to enhance the accuracy of the returned range.
* If it is not possible to return the range, because the field is not supported
* or for some other reason, an exception is thrown.
*
* If the field is a {@link ChronoField} then the query is implemented here.
* The {@code ERA} field returns the range.
* All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
*
* If the field is not a {@code ChronoField}, then the result of this method
* is obtained by invoking {@code TemporalField.rangeRefinedBy(TemporalAccessor)}
* passing {@code this} as the argument.
* Whether the range can be obtained is determined by the field.
*
* The {@code ERA} field returns a range for the one valid Hijrah era.
*
* @param field the field to query the range for, not null
* @return the range of valid values for the field, not null
* @throws DateTimeException if the range for the field cannot be obtained
* @throws UnsupportedTemporalTypeException if the unit is not supported
*/
@Override // override as super would return range from 0 to 1
public ValueRange range(TemporalField field) {
if (field == ERA) {
return ValueRange.of(1, 1);
}
return Era.super.range(field);
}
/**
* {@inheritDoc}
*
* @param style {@inheritDoc}
* @param locale {@inheritDoc}
*/
@Override
public String getDisplayName(TextStyle style, Locale locale) {
return new DateTimeFormatterBuilder()
.appendText(ERA, style)
.toFormatter(locale)
.withChronology(HijrahChronology.INSTANCE)
.format(HijrahDate.now());
}
}