net.time4j.tz.PlatformTimezone Maven / Gradle / Ivy
/*
* -----------------------------------------------------------------------
* Copyright © 2013-2015 Meno Hochschild, A timezone implementation which delegates to {@link java.util.TimeZone}
* and will therefore be available on every platform.
*
* @author Meno Hochschild
* @serial include
* @doctags.concurrency {threadsafe}
*/
final class PlatformTimezone
extends Timezone {
//~ Statische Felder/Initialisierungen --------------------------------
private static final long serialVersionUID = -8432968264242113551L;
//~ Instanzvariablen --------------------------------------------------
/**
* @serial timezone id
*/
private final TZID id;
/**
* @serial timezone of old JDK
*/
private final java.util.TimeZone tz;
/**
* @serial strict resolving of offset transitions
*/
private final boolean strict;
// nur nicht-null bei fester Verschiebung
private transient final ZonalOffset fixedOffset;
//~ Konstruktoren -----------------------------------------------------
/**
* Construtor for the system timezone (very internal use only).
*
* @param tzid resolved id of system timezone
*/
PlatformTimezone(TZID tzid) {
this(
tzid, // should originate from default tz
java.util.TimeZone.getDefault(),
false);
}
/**
* Konstruktor für eine beliebige Zeitzone.
*
* @param resolved timezone id with preference for enums
* @param rawID original timezone id
*/
PlatformTimezone(TZID resolved, String rawID) {
this(resolved, findZone(rawID), false);
}
// benutzt unter anderem in der Deserialisierung
private PlatformTimezone(
TZID resolved,
java.util.TimeZone zone,
boolean strict
) {
super();
this.id = resolved;
this.tz = (java.util.TimeZone) zone.clone();
this.strict = strict;
if (this.tz.useDaylightTime()) {
this.fixedOffset = null;
} else {
String zoneID = this.tz.getID();
boolean fixed = (
zoneID.startsWith("GMT")
|| zoneID.startsWith("Etc/")
|| zoneID.equals("Greenwich")
|| zoneID.equals("UCT")
|| zoneID.equals("UTC")
|| zoneID.equals("Universal")
|| zoneID.equals("Zulu")
);
if (fixed) {
this.fixedOffset =
fromOffsetMillis(
this.tz.getOffset(System.currentTimeMillis()));
} else {
this.fixedOffset = null;
}
}
}
//~ Methoden ----------------------------------------------------------
@Override
public TZID getID() {
return this.id;
}
@Override
public ZonalOffset getOffset(UnixTime ut) {
if (this.isFixed()) {
return this.fixedOffset;
}
return fromOffsetMillis(this.tz.getOffset(ut.getPosixTime() * 1000));
}
@Override
public ZonalOffset getStandardOffset(UnixTime ut) {
GregorianCalendar gcal = new GregorianCalendar(this.tz);
gcal.setTimeInMillis(ut.getPosixTime() * 1000);
return fromOffsetMillis(gcal.get(Calendar.ZONE_OFFSET));
}
@Override
public ZonalOffset getDaylightSavingOffset(UnixTime ut){
GregorianCalendar gcal = new GregorianCalendar(this.tz);
gcal.setTimeInMillis(ut.getPosixTime() * 1000);
return fromOffsetMillis(gcal.get(Calendar.DST_OFFSET));
}
@Override
public ZonalOffset getOffset(
GregorianDate localDate,
WallTime localTime
) {
if (this.isFixed()) {
return this.fixedOffset;
}
int year = localDate.getYear();
int month = localDate.getMonth();
int dom = localDate.getDayOfMonth();
int era;
int yearOfEra;
if (localTime.getHour() == 24) {
long mjd = MathUtils.safeAdd(GregorianMath.toMJD(localDate), 1);
long pd = GregorianMath.toPackedDate(mjd);
year = GregorianMath.readYear(pd);
month = GregorianMath.readMonth(pd);
dom = GregorianMath.readDayOfMonth(pd);
}
if (year > 0) {
era = GregorianCalendar.AD;
yearOfEra = year;
} else {
era = GregorianCalendar.BC;
yearOfEra = 1 - year;
}
int dow = GregorianMath.getDayOfWeek(year, month, dom) + 1;
if (dow == 8) {
dow = Calendar.SUNDAY;
}
int millis;
if (localTime.getHour() == 24) {
millis = 0;
} else {
millis = (
localTime.getHour() * 3600
+ localTime.getMinute() * 60
+ localTime.getSecond()
) * 1000 + (localTime.getNanosecond() / 1000000);
}
return fromOffsetMillis(
this.tz.getOffset(era, yearOfEra, month - 1, dom, dow, millis));
}
@Override
public boolean isInvalid(
GregorianDate localDate,
WallTime localTime
) {
if (this.isFixed()) {
return false;
}
int year = localDate.getYear();
int month = localDate.getMonth();
int day = localDate.getDayOfMonth();
int hour = localTime.getHour();
int minute = localTime.getMinute();
int second = localTime.getSecond();
int milli = localTime.getNanosecond() / 1000000;
GregorianCalendar gcal = new GregorianCalendar(this.tz);
gcal.set(Calendar.MILLISECOND, milli);
gcal.set(year, month - 1, day, hour, minute, second);
return (
(gcal.get(Calendar.YEAR) != year)
|| (gcal.get(Calendar.MONTH) + 1 != month)
|| (gcal.get(Calendar.DAY_OF_MONTH) != day)
|| (gcal.get(Calendar.HOUR_OF_DAY) != hour)
|| (gcal.get(Calendar.MINUTE) != minute)
|| (gcal.get(Calendar.SECOND) != second)
|| (gcal.get(Calendar.MILLISECOND) != milli)
);
}
@Override
public boolean isDaylightSaving(UnixTime ut) {
if (this.isFixed()) {
return false;
}
return this.tz.inDaylightTime(new Date(ut.getPosixTime() * 1000));
}
@Override
public boolean isFixed() {
return (this.fixedOffset != null);
}
// optional
@Override
public TransitionHistory getHistory() {
return (
(this.fixedOffset == null)
? null
: this.fixedOffset.getModel()
);
}
@Override
public boolean equals(Object obj) {
if (obj instanceof PlatformTimezone) {
PlatformTimezone that = (PlatformTimezone) obj;
if (!this.tz.equals(that.tz)) {
return false;
} else if (this.fixedOffset == null) {
return (that.fixedOffset == null);
} else {
return this.fixedOffset.equals(that.fixedOffset);
}
} else {
return false;
}
}
@Override
public int hashCode() {
return this.tz.hashCode();
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder(256);
sb.append('[');
sb.append(this.getClass().getName());
sb.append(':');
sb.append(this.tz);
sb.append(']');
return sb.toString();
}
@Override
public String getDisplayName(
NameStyle style,
Locale locale
) {
return this.tz.getDisplayName(
style.isDaylightSaving(),
style.isAbbreviation()
? java.util.TimeZone.SHORT
: java.util.TimeZone.LONG,
locale
);
}
@Override
public TransitionStrategy getStrategy() {
return this.strict ? STRICT_MODE : DEFAULT_CONFLICT_STRATEGY;
}
@Override
public Timezone with(TransitionStrategy strategy) {
if (this.getStrategy() == strategy) {
return this;
} else if (strategy == DEFAULT_CONFLICT_STRATEGY) {
return new PlatformTimezone(this.id, this.tz, false);
} else if (strategy == STRICT_MODE) {
return new PlatformTimezone(this.id, this.tz, true);
}
throw new UnsupportedOperationException(strategy.toString());
}
/**
* Findet die JDK-Zeitzone.
*
* @param id timezone id
* @return OLD-JDK timezone
*/
static java.util.TimeZone findZone(String id) {
if (id.equals("Z")) {
return java.util.TimeZone.getTimeZone("GMT+00:00");
} else if (id.startsWith("UTC")) {
return java.util.TimeZone.getTimeZone("GMT" + id.substring(3));
} else if (id.startsWith("UT")) {
return java.util.TimeZone.getTimeZone("GMT" + id.substring(2));
} else {
return java.util.TimeZone.getTimeZone(id);
}
}
/**
* Liegt die GMT-Zeitzone vor.
*
* @return {@code true} if this zone is "GMT" else {@code false}
*/
boolean isGMT() {
return this.tz.getID().equals("GMT");
}
private static ZonalOffset fromOffsetMillis(int offsetMillis) {
// never return any millisecond part
return ZonalOffset.ofTotalSeconds(
MathUtils.floorDivide(offsetMillis, 1000));
}
/**
* @serialData Asserts consistency of model.
* @return replacement object in serialization graph
*/
private Object readResolve() {
return new PlatformTimezone(this.id, this.tz, this.strict);
}
}
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