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* Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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/*
* 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
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package java.time.chrono;
import static java.time.temporal.ChronoField.EPOCH_DAY;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InvalidObjectException;
import java.io.ObjectInputStream;
import java.io.Serializable;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.time.Clock;
import java.time.DateTimeException;
import java.time.Instant;
import java.time.LocalDate;
import java.time.ZoneId;
import java.time.format.ResolverStyle;
import java.time.temporal.ChronoField;
import java.time.temporal.TemporalAccessor;
import java.time.temporal.TemporalField;
import java.time.temporal.ValueRange;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Properties;
import sun.util.logging.PlatformLogger;
/**
* The Hijrah calendar is a lunar calendar supporting Islamic calendars.
* <p>
* The HijrahChronology follows the rules of the Hijrah calendar system. The Hijrah
* calendar has several variants based on differences in when the new moon is
* determined to have occurred and where the observation is made.
* In some variants the length of each month is
* computed algorithmically from the astronomical data for the moon and earth and
* in others the length of the month is determined by an authorized sighting
* of the new moon. For the algorithmically based calendars the calendar
* can project into the future.
* For sighting based calendars only historical data from past
* sightings is available.
* <p>
* The length of each month is 29 or 30 days.
* Ordinary years have 354 days; leap years have 355 days.
*
* <p>
* CLDR and LDML identify variants:
* <table cellpadding="2" summary="Variants of Hijrah Calendars">
* <thead>
* <tr class="tableSubHeadingColor">
* <th class="colFirst" align="left" >Chronology ID</th>
* <th class="colFirst" align="left" >Calendar Type</th>
* <th class="colFirst" align="left" >Locale extension, see {@link java.util.Locale}</th>
* <th class="colLast" align="left" >Description</th>
* </tr>
* </thead>
* <tbody>
* <tr class="altColor">
* <td>Hijrah-umalqura</td>
* <td>islamic-umalqura</td>
* <td>ca-islamic-umalqura</td>
* <td>Islamic - Umm Al-Qura calendar of Saudi Arabia</td>
* </tr>
* </tbody>
* </table>
* <p>Additional variants may be available through {@link Chronology#getAvailableChronologies()}.
*
* <p>Example</p>
* <p>
* Selecting the chronology from the locale uses {@link Chronology#ofLocale}
* to find the Chronology based on Locale supported BCP 47 extension mechanism
* to request a specific calendar ("ca"). For example,
* </p>
* <pre>
* Locale locale = Locale.forLanguageTag("en-US-u-ca-islamic-umalqura");
* Chronology chrono = Chronology.ofLocale(locale);
* </pre>
*
* @implSpec
* This class is immutable and thread-safe.
*
* @implNote
* Each Hijrah variant is configured individually. Each variant is defined by a
* property resource that defines the {@code ID}, the {@code calendar type},
* the start of the calendar, the alignment with the
* ISO calendar, and the length of each month for a range of years.
* The variants are identified in the {@code calendars.properties} file.
* The new properties are prefixed with {@code "calendars.hijrah."}:
* <table cellpadding="2" border="0" summary="Configuration of Hijrah Calendar Variants">
* <thead>
* <tr class="tableSubHeadingColor">
* <th class="colFirst" align="left">Property Name</th>
* <th class="colFirst" align="left">Property value</th>
* <th class="colLast" align="left">Description </th>
* </tr>
* </thead>
* <tbody>
* <tr class="altColor">
* <td>calendars.hijrah.{ID}</td>
* <td>The property resource defining the {@code {ID}} variant</td>
* <td>The property resource is located with the {@code calendars.properties} file</td>
* </tr>
* <tr class="rowColor">
* <td>calendars.hijrah.{ID}.type</td>
* <td>The calendar type</td>
* <td>LDML defines the calendar type names</td>
* </tr>
* </tbody>
* </table>
* <p>
* The Hijrah property resource is a set of properties that describe the calendar.
* The syntax is defined by {@code java.util.Properties#load(Reader)}.
* <table cellpadding="2" summary="Configuration of Hijrah Calendar">
* <thead>
* <tr class="tableSubHeadingColor">
* <th class="colFirst" align="left" > Property Name</th>
* <th class="colFirst" align="left" > Property value</th>
* <th class="colLast" align="left" > Description </th>
* </tr>
* </thead>
* <tbody>
* <tr class="altColor">
* <td>id</td>
* <td>Chronology Id, for example, "Hijrah-umalqura"</td>
* <td>The Id of the calendar in common usage</td>
* </tr>
* <tr class="rowColor">
* <td>type</td>
* <td>Calendar type, for example, "islamic-umalqura"</td>
* <td>LDML defines the calendar types</td>
* </tr>
* <tr class="altColor">
* <td>version</td>
* <td>Version, for example: "1.8.0_1"</td>
* <td>The version of the Hijrah variant data</td>
* </tr>
* <tr class="rowColor">
* <td>iso-start</td>
* <td>ISO start date, formatted as {@code yyyy-MM-dd}, for example: "1900-04-30"</td>
* <td>The ISO date of the first day of the minimum Hijrah year.</td>
* </tr>
* <tr class="altColor">
* <td>yyyy - a numeric 4 digit year, for example "1434"</td>
* <td>The value is a sequence of 12 month lengths,
* for example: "29 30 29 30 29 30 30 30 29 30 29 29"</td>
* <td>The lengths of the 12 months of the year separated by whitespace.
* A numeric year property must be present for every year without any gaps.
* The month lengths must be between 29-32 inclusive.
* </td>
* </tr>
* </tbody>
* </table>
*
* @since 1.8
*/
public final class HijrahChronology extends AbstractChronology implements Serializable {
/**
* The Hijrah Calendar id.
*/
private final transient String typeId;
/**
* The Hijrah calendarType.
*/
private final transient String calendarType;
/**
* Serialization version.
*/
private static final long serialVersionUID = 3127340209035924785L;
/**
* Singleton instance of the Islamic Umm Al-Qura calendar of Saudi Arabia.
* Other Hijrah chronology variants may be available from
* {@link Chronology#getAvailableChronologies}.
*/
public static final HijrahChronology INSTANCE;
/**
* Flag to indicate the initialization of configuration data is complete.
* @see #checkCalendarInit()
*/
private transient volatile boolean initComplete;
/**
* Array of epoch days indexed by Hijrah Epoch month.
* Computed by {@link #loadCalendarData}.
*/
private transient int[] hijrahEpochMonthStartDays;
/**
* The minimum epoch day of this Hijrah calendar.
* Computed by {@link #loadCalendarData}.
*/
private transient int minEpochDay;
/**
* The maximum epoch day for which calendar data is available.
* Computed by {@link #loadCalendarData}.
*/
private transient int maxEpochDay;
/**
* The minimum epoch month.
* Computed by {@link #loadCalendarData}.
*/
private transient int hijrahStartEpochMonth;
/**
* The minimum length of a month.
* Computed by {@link #createEpochMonths}.
*/
private transient int minMonthLength;
/**
* The maximum length of a month.
* Computed by {@link #createEpochMonths}.
*/
private transient int maxMonthLength;
/**
* The minimum length of a year in days.
* Computed by {@link #createEpochMonths}.
*/
private transient int minYearLength;
/**
* The maximum length of a year in days.
* Computed by {@link #createEpochMonths}.
*/
private transient int maxYearLength;
/**
* A reference to the properties stored in
* ${java.home}/lib/calendars.properties
*/
private final transient static Properties calendarProperties;
/**
* Prefix of property names for Hijrah calendar variants.
*/
private static final String PROP_PREFIX = "calendar.hijrah.";
/**
* Suffix of property names containing the calendar type of a variant.
*/
private static final String PROP_TYPE_SUFFIX = ".type";
/**
* Static initialization of the predefined calendars found in the
* lib/calendars.properties file.
*/
static {
try {
calendarProperties = sun.util.calendar.BaseCalendar.getCalendarProperties();
} catch (IOException ioe) {
throw new InternalError("Can't initialize lib/calendars.properties", ioe);
}
try {
INSTANCE = new HijrahChronology("Hijrah-umalqura");
// Register it by its aliases
AbstractChronology.registerChrono(INSTANCE, "Hijrah");
AbstractChronology.registerChrono(INSTANCE, "islamic");
} catch (DateTimeException ex) {
// Absence of Hijrah calendar is fatal to initializing this class.
PlatformLogger logger = PlatformLogger.getLogger("java.time.chrono");
logger.severe("Unable to initialize Hijrah calendar: Hijrah-umalqura", ex);
throw new RuntimeException("Unable to initialize Hijrah-umalqura calendar", ex.getCause());
}
registerVariants();
}
/**
* For each Hijrah variant listed, create the HijrahChronology and register it.
* Exceptions during initialization are logged but otherwise ignored.
*/
private static void registerVariants() {
for (String name : calendarProperties.stringPropertyNames()) {
if (name.startsWith(PROP_PREFIX)) {
String id = name.substring(PROP_PREFIX.length());
if (id.indexOf('.') >= 0) {
continue; // no name or not a simple name of a calendar
}
if (id.equals(INSTANCE.getId())) {
continue; // do not duplicate the default
}
try {
// Create and register the variant
HijrahChronology chrono = new HijrahChronology(id);
AbstractChronology.registerChrono(chrono);
} catch (DateTimeException ex) {
// Log error and continue
PlatformLogger logger = PlatformLogger.getLogger("java.time.chrono");
logger.severe("Unable to initialize Hijrah calendar: " + id, ex);
}
}
}
}
/**
* Create a HijrahChronology for the named variant.
* The resource and calendar type are retrieved from properties
* in the {@code calendars.properties}.
* The property names are {@code "calendar.hijrah." + id}
* and {@code "calendar.hijrah." + id + ".type"}
* @param id the id of the calendar
* @throws DateTimeException if the calendar type is missing from the properties file.
* @throws IllegalArgumentException if the id is empty
*/
private HijrahChronology(String id) throws DateTimeException {
if (id.isEmpty()) {
throw new IllegalArgumentException("calendar id is empty");
}
String propName = PROP_PREFIX + id + PROP_TYPE_SUFFIX;
String calType = calendarProperties.getProperty(propName);
if (calType == null || calType.isEmpty()) {
throw new DateTimeException("calendarType is missing or empty for: " + propName);
}
this.typeId = id;
this.calendarType = calType;
}
/**
* Check and ensure that the calendar data has been initialized.
* The initialization check is performed at the boundary between
* public and package methods. If a public calls another public method
* a check is not necessary in the caller.
* The constructors of HijrahDate call {@link #getEpochDay} or
* {@link #getHijrahDateInfo} so every call from HijrahDate to a
* HijrahChronology via package private methods has been checked.
*
* @throws DateTimeException if the calendar data configuration is
* malformed or IOExceptions occur loading the data
*/
private void checkCalendarInit() {
// Keep this short so it can be inlined for performance
if (initComplete == false) {
loadCalendarData();
initComplete = true;
}
}
//-----------------------------------------------------------------------
/**
* Gets the ID of the chronology.
* <p>
* The ID uniquely identifies the {@code Chronology}. It can be used to
* lookup the {@code Chronology} using {@link #of(String)}.
*
* @return the chronology ID, non-null
* @see #getCalendarType()
*/
@Override
public String getId() {
return typeId;
}
/**
* Gets the calendar type of the Islamic calendar.
* <p>
* The calendar type is an identifier defined by the
* <em>Unicode Locale Data Markup Language (LDML)</em> specification.
* It can be used to lookup the {@code Chronology} using {@link #of(String)}.
*
* @return the calendar system type; non-null if the calendar has
* a standard type, otherwise null
* @see #getId()
*/
@Override
public String getCalendarType() {
return calendarType;
}
//-----------------------------------------------------------------------
/**
* Obtains a local date in Hijrah calendar system from the
* era, year-of-era, month-of-year and day-of-month fields.
*
* @param era the Hijrah era, not null
* @param yearOfEra the year-of-era
* @param month the month-of-year
* @param dayOfMonth the day-of-month
* @return the Hijrah local date, not null
* @throws DateTimeException if unable to create the date
* @throws ClassCastException if the {@code era} is not a {@code HijrahEra}
*/
@Override
public HijrahDate date(Era era, int yearOfEra, int month, int dayOfMonth) {
return date(prolepticYear(era, yearOfEra), month, dayOfMonth);
}
/**
* Obtains a local date in Hijrah calendar system from the
* proleptic-year, month-of-year and day-of-month fields.
*
* @param prolepticYear the proleptic-year
* @param month the month-of-year
* @param dayOfMonth the day-of-month
* @return the Hijrah local date, not null
* @throws DateTimeException if unable to create the date
*/
@Override
public HijrahDate date(int prolepticYear, int month, int dayOfMonth) {
return HijrahDate.of(this, prolepticYear, month, dayOfMonth);
}
/**
* Obtains a local date in Hijrah calendar system from the
* era, year-of-era and day-of-year fields.
*
* @param era the Hijrah era, not null
* @param yearOfEra the year-of-era
* @param dayOfYear the day-of-year
* @return the Hijrah local date, not null
* @throws DateTimeException if unable to create the date
* @throws ClassCastException if the {@code era} is not a {@code HijrahEra}
*/
@Override
public HijrahDate dateYearDay(Era era, int yearOfEra, int dayOfYear) {
return dateYearDay(prolepticYear(era, yearOfEra), dayOfYear);
}
/**
* Obtains a local date in Hijrah calendar system from the
* proleptic-year and day-of-year fields.
*
* @param prolepticYear the proleptic-year
* @param dayOfYear the day-of-year
* @return the Hijrah local date, not null
* @throws DateTimeException if the value of the year is out of range,
* or if the day-of-year is invalid for the year
*/
@Override
public HijrahDate dateYearDay(int prolepticYear, int dayOfYear) {
HijrahDate date = HijrahDate.of(this, prolepticYear, 1, 1);
if (dayOfYear > date.lengthOfYear()) {
throw new DateTimeException("Invalid dayOfYear: " + dayOfYear);
}
return date.plusDays(dayOfYear - 1);
}
/**
* Obtains a local date in the Hijrah calendar system from the epoch-day.
*
* @param epochDay the epoch day
* @return the Hijrah local date, not null
* @throws DateTimeException if unable to create the date
*/
@Override // override with covariant return type
public HijrahDate dateEpochDay(long epochDay) {
return HijrahDate.ofEpochDay(this, epochDay);
}
@Override
public HijrahDate dateNow() {
return dateNow(Clock.systemDefaultZone());
}
@Override
public HijrahDate dateNow(ZoneId zone) {
return dateNow(Clock.system(zone));
}
@Override
public HijrahDate dateNow(Clock clock) {
return date(LocalDate.now(clock));
}
@Override
public HijrahDate date(TemporalAccessor temporal) {
if (temporal instanceof HijrahDate) {
return (HijrahDate) temporal;
}
return HijrahDate.ofEpochDay(this, temporal.getLong(EPOCH_DAY));
}
@Override
@SuppressWarnings("unchecked")
public ChronoLocalDateTime<HijrahDate> localDateTime(TemporalAccessor temporal) {
return (ChronoLocalDateTime<HijrahDate>) super.localDateTime(temporal);
}
@Override
@SuppressWarnings("unchecked")
public ChronoZonedDateTime<HijrahDate> zonedDateTime(TemporalAccessor temporal) {
return (ChronoZonedDateTime<HijrahDate>) super.zonedDateTime(temporal);
}
@Override
@SuppressWarnings("unchecked")
public ChronoZonedDateTime<HijrahDate> zonedDateTime(Instant instant, ZoneId zone) {
return (ChronoZonedDateTime<HijrahDate>) super.zonedDateTime(instant, zone);
}
//-----------------------------------------------------------------------
@Override
public boolean isLeapYear(long prolepticYear) {
checkCalendarInit();
int epochMonth = yearToEpochMonth((int) prolepticYear);
if (epochMonth < 0 || epochMonth > maxEpochDay) {
throw new DateTimeException("Hijrah date out of range");
}
int len = getYearLength((int) prolepticYear);
return (len > 354);
}
@Override
public int prolepticYear(Era era, int yearOfEra) {
if (era instanceof HijrahEra == false) {
throw new ClassCastException("Era must be HijrahEra");
}
return yearOfEra;
}
@Override
public HijrahEra eraOf(int eraValue) {
switch (eraValue) {
case 1:
return HijrahEra.AH;
default:
throw new DateTimeException("invalid Hijrah era");
}
}
@Override
public List<Era> eras() {
return Arrays.<Era>asList(HijrahEra.values());
}
//-----------------------------------------------------------------------
@Override
public ValueRange range(ChronoField field) {
checkCalendarInit();
if (field instanceof ChronoField) {
ChronoField f = field;
switch (f) {
case DAY_OF_MONTH:
return ValueRange.of(1, 1, getMinimumMonthLength(), getMaximumMonthLength());
case DAY_OF_YEAR:
return ValueRange.of(1, getMaximumDayOfYear());
case ALIGNED_WEEK_OF_MONTH:
return ValueRange.of(1, 5);
case YEAR:
case YEAR_OF_ERA:
return ValueRange.of(getMinimumYear(), getMaximumYear());
case ERA:
return ValueRange.of(1, 1);
default:
return field.range();
}
}
return field.range();
}
//-----------------------------------------------------------------------
@Override // override for return type
public HijrahDate resolveDate(Map<TemporalField, Long> fieldValues, ResolverStyle resolverStyle) {
return (HijrahDate) super.resolveDate(fieldValues, resolverStyle);
}
//-----------------------------------------------------------------------
/**
* Check the validity of a year.
*
* @param prolepticYear the year to check
*/
int checkValidYear(long prolepticYear) {
if (prolepticYear < getMinimumYear() || prolepticYear > getMaximumYear()) {
throw new DateTimeException("Invalid Hijrah year: " + prolepticYear);
}
return (int) prolepticYear;
}
void checkValidDayOfYear(int dayOfYear) {
if (dayOfYear < 1 || dayOfYear > getMaximumDayOfYear()) {
throw new DateTimeException("Invalid Hijrah day of year: " + dayOfYear);
}
}
void checkValidMonth(int month) {
if (month < 1 || month > 12) {
throw new DateTimeException("Invalid Hijrah month: " + month);
}
}
//-----------------------------------------------------------------------
/**
* Returns an array containing the Hijrah year, month and day
* computed from the epoch day.
*
* @param epochDay the EpochDay
* @return int[0] = YEAR, int[1] = MONTH, int[2] = DATE
*/
int[] getHijrahDateInfo(int epochDay) {
checkCalendarInit(); // ensure that the chronology is initialized
if (epochDay < minEpochDay || epochDay >= maxEpochDay) {
throw new DateTimeException("Hijrah date out of range");
}
int epochMonth = epochDayToEpochMonth(epochDay);
int year = epochMonthToYear(epochMonth);
int month = epochMonthToMonth(epochMonth);
int day1 = epochMonthToEpochDay(epochMonth);
int date = epochDay - day1; // epochDay - dayOfEpoch(year, month);
int dateInfo[] = new int[3];
dateInfo[0] = year;
dateInfo[1] = month + 1; // change to 1-based.
dateInfo[2] = date + 1; // change to 1-based.
return dateInfo;
}
/**
* Return the epoch day computed from Hijrah year, month, and day.
*
* @param prolepticYear the year to represent, 0-origin
* @param monthOfYear the month-of-year to represent, 1-origin
* @param dayOfMonth the day-of-month to represent, 1-origin
* @return the epoch day
*/
long getEpochDay(int prolepticYear, int monthOfYear, int dayOfMonth) {
checkCalendarInit(); // ensure that the chronology is initialized
checkValidMonth(monthOfYear);
int epochMonth = yearToEpochMonth(prolepticYear) + (monthOfYear - 1);
if (epochMonth < 0 || epochMonth >= hijrahEpochMonthStartDays.length) {
throw new DateTimeException("Invalid Hijrah date, year: " +
prolepticYear + ", month: " + monthOfYear);
}
if (dayOfMonth < 1 || dayOfMonth > getMonthLength(prolepticYear, monthOfYear)) {
throw new DateTimeException("Invalid Hijrah day of month: " + dayOfMonth);
}
return epochMonthToEpochDay(epochMonth) + (dayOfMonth - 1);
}
/**
* Returns day of year for the year and month.
*
* @param prolepticYear a proleptic year
* @param month a month, 1-origin
* @return the day of year, 1-origin
*/
int getDayOfYear(int prolepticYear, int month) {
return yearMonthToDayOfYear(prolepticYear, (month - 1));
}
/**
* Returns month length for the year and month.
*
* @param prolepticYear a proleptic year
* @param monthOfYear a month, 1-origin.
* @return the length of the month
*/
int getMonthLength(int prolepticYear, int monthOfYear) {
int epochMonth = yearToEpochMonth(prolepticYear) + (monthOfYear - 1);
if (epochMonth < 0 || epochMonth >= hijrahEpochMonthStartDays.length) {
throw new DateTimeException("Invalid Hijrah date, year: " +
prolepticYear + ", month: " + monthOfYear);
}
return epochMonthLength(epochMonth);
}
/**
* Returns year length.
* Note: The 12th month must exist in the data.
*
* @param prolepticYear a proleptic year
* @return year length in days
*/
int getYearLength(int prolepticYear) {
return yearMonthToDayOfYear(prolepticYear, 12);
}
/**
* Return the minimum supported Hijrah year.
*
* @return the minimum
*/
int getMinimumYear() {
return epochMonthToYear(0);
}
/**
* Return the maximum supported Hijrah ear.
*
* @return the minimum
*/
int getMaximumYear() {
return epochMonthToYear(hijrahEpochMonthStartDays.length - 1) - 1;
}
/**
* Returns maximum day-of-month.
*
* @return maximum day-of-month
*/
int getMaximumMonthLength() {
return maxMonthLength;
}
/**
* Returns smallest maximum day-of-month.
*
* @return smallest maximum day-of-month
*/
int getMinimumMonthLength() {
return minMonthLength;
}
/**
* Returns maximum day-of-year.
*
* @return maximum day-of-year
*/
int getMaximumDayOfYear() {
return maxYearLength;
}
/**
* Returns smallest maximum day-of-year.
*
* @return smallest maximum day-of-year
*/
int getSmallestMaximumDayOfYear() {
return minYearLength;
}
/**
* Returns the epochMonth found by locating the epochDay in the table. The
* epochMonth is the index in the table
*
* @param epochDay
* @return The index of the element of the start of the month containing the
* epochDay.
*/
private int epochDayToEpochMonth(int epochDay) {
// binary search
int ndx = Arrays.binarySearch(hijrahEpochMonthStartDays, epochDay);
if (ndx < 0) {
ndx = -ndx - 2;
}
return ndx;
}
/**
* Returns the year computed from the epochMonth
*
* @param epochMonth the epochMonth
* @return the Hijrah Year
*/
private int epochMonthToYear(int epochMonth) {
return (epochMonth + hijrahStartEpochMonth) / 12;
}
/**
* Returns the epochMonth for the Hijrah Year.
*
* @param year the HijrahYear
* @return the epochMonth for the beginning of the year.
*/
private int yearToEpochMonth(int year) {
return (year * 12) - hijrahStartEpochMonth;
}
/**
* Returns the Hijrah month from the epochMonth.
*
* @param epochMonth the epochMonth
* @return the month of the Hijrah Year
*/
private int epochMonthToMonth(int epochMonth) {
return (epochMonth + hijrahStartEpochMonth) % 12;
}
/**
* Returns the epochDay for the start of the epochMonth.
*
* @param epochMonth the epochMonth
* @return the epochDay for the start of the epochMonth.
*/
private int epochMonthToEpochDay(int epochMonth) {
return hijrahEpochMonthStartDays[epochMonth];
}
/**
* Returns the day of year for the requested HijrahYear and month.
*
* @param prolepticYear the Hijrah year
* @param month the Hijrah month
* @return the day of year for the start of the month of the year
*/
private int yearMonthToDayOfYear(int prolepticYear, int month) {
int epochMonthFirst = yearToEpochMonth(prolepticYear);
return epochMonthToEpochDay(epochMonthFirst + month)
- epochMonthToEpochDay(epochMonthFirst);
}
/**
* Returns the length of the epochMonth. It is computed from the start of
* the following month minus the start of the requested month.
*
* @param epochMonth the epochMonth; assumed to be within range
* @return the length in days of the epochMonth
*/
private int epochMonthLength(int epochMonth) {
// The very last entry in the epochMonth table is not the start of a month
return hijrahEpochMonthStartDays[epochMonth + 1]
- hijrahEpochMonthStartDays[epochMonth];
}
//-----------------------------------------------------------------------
private static final String KEY_ID = "id";
private static final String KEY_TYPE = "type";
private static final String KEY_VERSION = "version";
private static final String KEY_ISO_START = "iso-start";
/**
* Return the configuration properties from the resource.
* <p>
* The default location of the variant configuration resource is:
* <pre>
* "$java.home/lib/" + resource-name
* </pre>
*
* @param resource the name of the calendar property resource
* @return a Properties containing the properties read from the resource.
* @throws Exception if access to the property resource fails
*/
private static Properties readConfigProperties(final String resource) throws Exception {
try {
return AccessController
.doPrivileged((java.security.PrivilegedExceptionAction<Properties>)
() -> {
String libDir = System.getProperty("java.home") + File.separator + "lib";
File file = new File(libDir, resource);
Properties props = new Properties();
try (InputStream is = new FileInputStream(file)) {
props.load(is);
}
return props;
});
} catch (PrivilegedActionException pax) {
throw pax.getException();
}
}
/**
* Loads and processes the Hijrah calendar properties file for this calendarType.
* The starting Hijrah date and the corresponding ISO date are
* extracted and used to calculate the epochDate offset.
* The version number is identified and ignored.
* Everything else is the data for a year with containing the length of each
* of 12 months.
*
* @throws DateTimeException if initialization of the calendar data from the
* resource fails
*/
private void loadCalendarData() {
try {
String resourceName = calendarProperties.getProperty(PROP_PREFIX + typeId);
Objects.requireNonNull(resourceName, "Resource missing for calendar: " + PROP_PREFIX + typeId);
Properties props = readConfigProperties(resourceName);
Map<Integer, int[]> years = new HashMap<>();
int minYear = Integer.MAX_VALUE;
int maxYear = Integer.MIN_VALUE;
String id = null;
String type = null;
String version = null;
int isoStart = 0;
for (Map.Entry<Object, Object> entry : props.entrySet()) {
String key = (String) entry.getKey();
switch (key) {
case KEY_ID:
id = (String)entry.getValue();
break;
case KEY_TYPE:
type = (String)entry.getValue();
break;
case KEY_VERSION:
version = (String)entry.getValue();
break;
case KEY_ISO_START: {
int[] ymd = parseYMD((String) entry.getValue());
isoStart = (int) LocalDate.of(ymd[0], ymd[1], ymd[2]).toEpochDay();
break;
}
default:
try {
// Everything else is either a year or invalid
int year = Integer.valueOf(key);
int[] months = parseMonths((String) entry.getValue());
years.put(year, months);
maxYear = Math.max(maxYear, year);
minYear = Math.min(minYear, year);
} catch (NumberFormatException nfe) {
throw new IllegalArgumentException("bad key: " + key);
}
}
}
if (!getId().equals(id)) {
throw new IllegalArgumentException("Configuration is for a different calendar: " + id);
}
if (!getCalendarType().equals(type)) {
throw new IllegalArgumentException("Configuration is for a different calendar type: " + type);
}
if (version == null || version.isEmpty()) {
throw new IllegalArgumentException("Configuration does not contain a version");
}
if (isoStart == 0) {
throw new IllegalArgumentException("Configuration does not contain a ISO start date");
}
// Now create and validate the array of epochDays indexed by epochMonth
hijrahStartEpochMonth = minYear * 12;
minEpochDay = isoStart;
hijrahEpochMonthStartDays = createEpochMonths(minEpochDay, minYear, maxYear, years);
maxEpochDay = hijrahEpochMonthStartDays[hijrahEpochMonthStartDays.length - 1];
// Compute the min and max year length in days.
for (int year = minYear; year < maxYear; year++) {
int length = getYearLength(year);
minYearLength = Math.min(minYearLength, length);
maxYearLength = Math.max(maxYearLength, length);
}
} catch (Exception ex) {
// Log error and throw a DateTimeException
PlatformLogger logger = PlatformLogger.getLogger("java.time.chrono");
logger.severe("Unable to initialize Hijrah calendar proxy: " + typeId, ex);
throw new DateTimeException("Unable to initialize HijrahCalendar: " + typeId, ex);
}
}
/**
* Converts the map of year to month lengths ranging from minYear to maxYear
* into a linear contiguous array of epochDays. The index is the hijrahMonth
* computed from year and month and offset by minYear. The value of each
* entry is the epochDay corresponding to the first day of the month.
*
* @param minYear The minimum year for which data is provided
* @param maxYear The maximum year for which data is provided
* @param years a Map of year to the array of 12 month lengths
* @return array of epochDays for each month from min to max
*/
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