net.time4j.YOWElement Maven / Gradle / Ivy
/*
* -----------------------------------------------------------------------
* Copyright © 2013-2014 Meno Hochschild, Repräsentiert das Jahr in einem ISO-Wochendatum.
*
* @author Meno Hochschild
* @concurrency
*/
final class YOWElement
extends AbstractDateElement
implements NumericalElement {
//~ Statische Felder/Initialisierungen --------------------------------
@SuppressWarnings("rawtypes")
private static final UnitRule U_RULE = new URule();
/**
* Singleton-Instanz.
*/
static final YOWElement INSTANCE = new YOWElement("YEAR_OF_WEEKDATE");
private static final long serialVersionUID = -6907291758376370420L;
//~ Instanzvariablen --------------------------------------------------
private transient final ElementOperator previousAdjuster;
private transient final ElementOperator nextAdjuster;
//~ Konstruktoren -----------------------------------------------------
private YOWElement(String name) {
super(name);
this.previousAdjuster = new YOWRollingAdjuster(-1);
this.nextAdjuster = new YOWRollingAdjuster(1);
}
//~ Methoden ----------------------------------------------------------
@Override
public Class getType() {
return Integer.class;
}
@Override
public char getSymbol() {
return 'Y';
}
@Override
public int numerical(Integer value) {
return value.intValue();
}
@Override
public Integer getDefaultMinimum() {
return PlainDate.MIN_YEAR;
}
@Override
public Integer getDefaultMaximum() {
return PlainDate.MAX_YEAR;
}
@Override
public boolean isDateElement() {
return true;
}
@Override
public boolean isTimeElement() {
return false;
}
@Override
public ElementOperator decremented() {
return this.previousAdjuster;
}
@Override
public ElementOperator incremented() {
return this.nextAdjuster;
}
/**
* Erzeugt eine Elementregel.
*
* @param either {@code PlainDate} or {@code PlainTimestamp}
* @param type helps to improve type inference
* @return new element rule
*/
static > ElementRule elementRule(
Class type
) {
return new ERule();
}
@SuppressWarnings("unchecked")
private static > UnitRule unitRule() {
return U_RULE;
}
// Ermittelt den Wochenbeginn der ersten Kalenderwoche eines
// Jahres auf einer day-of-year-Skala (kann auch <= 0 sein).
private static int getFirstCalendarWeekAsDayOfYear(
PlainDate date,
int shift // -1 = Vorjahr, 0 = aktuelles Jahr, +1 = Folgejahr
) {
return getFirstCalendarWeekAsDayOfYear(date.getYear() + shift);
}
// Ermittelt den Wochenbeginn der ersten Kalenderwoche eines
// Jahres auf einer day-of-year-Skala (kann auch <= 0 sein).
private static int getFirstCalendarWeekAsDayOfYear(int year) {
Weekday wdNewYear =
Weekday.valueOf(GregorianMath.getDayOfWeek(year, 1, 1));
int dow = wdNewYear.getValue(Weekmodel.ISO);
return (
(dow <= 8 - Weekmodel.ISO.getMinimalDaysInFirstWeek())
? 2 - dow
: 9 - dow
);
}
// Länge eines Jahres in Tagen
private static int getLengthOfYear(
PlainDate date,
int shift // -1 = Vorjahr, 0 = aktuelles Jahr, +1 = Folgejahr
) {
return (
GregorianMath.isLeapYear(date.getYear() + shift)
? 366
: 365
);
}
// Optimierung als Ersatz für date.getWeekOfYear()
private static int getWeekOfYear(PlainDate date) {
int dayOfYear = date.getDayOfYear();
int wCurrent = getFirstCalendarWeekAsDayOfYear(date, 0);
if (wCurrent <= dayOfYear) {
int result = ((dayOfYear - wCurrent) / 7) + 1;
if (result >= 53) { // Optimierung
int wNext =
getFirstCalendarWeekAsDayOfYear(date, 1)
+ getLengthOfYear(date, 0);
if (wNext <= dayOfYear) {
result = 1;
}
}
return result;
} else {
int wPrevious = getFirstCalendarWeekAsDayOfYear(date, -1);
int dayCurrent = dayOfYear + getLengthOfYear(date, -1);
return ((dayCurrent - wPrevious) / 7) + 1;
}
}
private Object readResolve() throws ObjectStreamException {
return INSTANCE;
}
//~ Innere Klassen ----------------------------------------------------
/**
* Spezial-Zeiteinheit für wochenbasierte Jahre.
*/
static class YOWUnit
extends BasicUnit
implements IsoDateUnit, Serializable {
//~ Statische Felder/Initialisierungen ----------------------------
/** Singleton. */
static final YOWUnit WEEK_BASED_YEARS = new YOWUnit();
private static final long serialVersionUID = -4981215347844372171L;
//~ Konstruktoren -------------------------------------------------
private YOWUnit() {
// singleton
}
//~ Methoden ------------------------------------------------------
@Override
public char getSymbol() {
return '\u0000';
}
@Override
public double getLength() {
return CalendarUnit.YEARS.getLength();
}
@Override
public boolean isCalendrical() {
return true;
}
@Override
public String toString() {
return "WEEK_BASED_YEARS";
}
@Override
protected > UnitRule derive(
Chronology chronology
) {
if (chronology.isRegistered(CALENDAR_DATE)) {
return YOWElement.unitRule();
}
return null;
}
private Object readResolve() throws ObjectStreamException {
return WEEK_BASED_YEARS;
}
}
private static class YOWRollingAdjuster
extends ElementOperator {
//~ Instanzvariablen ----------------------------------------------
private final long amount;
private final ChronoOperator yowTS;
//~ Konstruktoren -------------------------------------------------
private YOWRollingAdjuster(long amount) {
super(YOWElement.INSTANCE, OP_YOW);
this.amount = amount;
this.yowTS =
new ChronoOperator() {
@Override
public PlainTimestamp apply(PlainTimestamp entity) {
UnitRule rule = YOWElement.unitRule();
return rule.addTo(
entity,
YOWRollingAdjuster.this.amount);
}
};
}
//~ Methoden ------------------------------------------------------
@Override
public PlainDate apply(PlainDate entity) {
UnitRule rule = YOWElement.unitRule();
return rule.addTo(entity, this.amount);
}
@Override
ChronoOperator onTimestamp() {
return this.yowTS;
}
}
private static class URule>
implements UnitRule {
//~ Methoden ------------------------------------------------------
@Override
public T addTo(
T entity,
long amount
) {
if (amount == 0) {
return entity;
}
int yow =
MathUtils.safeCast(
MathUtils.safeAdd(
entity.get(YOWElement.INSTANCE).intValue(),
amount)
);
PlainDate date = entity.get(CALENDAR_DATE);
int woy = date.getWeekOfYear();
Weekday dow = date.getDayOfWeek();
if (woy == 53) {
PlainDate test = PlainDate.of(yow, 26, dow);
woy = test.getMaximum(Weekmodel.ISO.weekOfYear());
}
return entity.with(
CALENDAR_DATE,
PlainDate.of(yow, woy, dow));
}
@Override
public long between(
T start,
T end
) {
PlainDate startDate = start.get(CALENDAR_DATE);
PlainDate endDate = end.get(CALENDAR_DATE);
int startYOW = startDate.get(YOWElement.INSTANCE).intValue();
int endYOW = endDate.get(YOWElement.INSTANCE).intValue();
long delta = endYOW - startYOW;
if (delta != 0) {
int startWOY = getWeekOfYear(startDate);
int endWOY = getWeekOfYear(endDate);
if ((delta > 0) && (startWOY > endWOY)) {
delta--;
} else if ((delta < 0) && (startWOY < endWOY)) {
delta++;
}
if ((delta != 0) && (startWOY == endWOY)) {
int startDOW = startDate.getDayOfWeek().getValue();
int endDOW = endDate.getDayOfWeek().getValue();
if ((delta > 0) && (startDOW > endDOW)) {
delta--;
} else if ((delta < 0) && (startDOW < endDOW)) {
delta++;
}
if (
(delta != 0)
&& (startDOW == endDOW)
&& start.contains(WALL_TIME)
&& end.contains(WALL_TIME)
) {
PlainTime t1 = start.get(WALL_TIME);
PlainTime t2 = end.get(WALL_TIME);
if ((delta > 0) && t1.isAfter(t2)) {
delta--;
} else if ((delta < 0) && t1.isBefore(t2)) {
delta++;
}
}
}
}
return delta;
}
}
private static class ERule>
implements ElementRule {
//~ Methoden ------------------------------------------------------
@Override
public Integer getValue(T context) {
PlainDate date = context.get(CALENDAR_DATE);
int year = date.getYear();
int dayOfYear = date.getDayOfYear();
int wCurrent = getFirstCalendarWeekAsDayOfYear(date, 0);
if (wCurrent <= dayOfYear) {
if (((dayOfYear - wCurrent) / 7) + 1 >= 53) {
int wNext =
getFirstCalendarWeekAsDayOfYear(date, 1)
+ getLengthOfYear(date, 0);
if (wNext <= dayOfYear) {
year++;
}
}
} else {
year--;
}
return Integer.valueOf(year);
}
@Override
public Integer getMinimum(T context) {
return YOWElement.INSTANCE.getDefaultMinimum();
}
@Override
public Integer getMaximum(T context) {
return YOWElement.INSTANCE.getDefaultMaximum();
}
@Override
public boolean isValid(
T context,
Integer value
) {
if (value == null) {
return false;
}
int v = value.intValue();
return (
(v >= GregorianMath.MIN_YEAR)
&& (v <= GregorianMath.MAX_YEAR)
);
}
@Override
public T withValue(
T context,
Integer value,
boolean lenient
) {
PlainDate date = context.get(CALENDAR_DATE);
date = setYearOfWeekdate(date, value.intValue());
return context.with(CALENDAR_DATE, date);
}
@Override
public ChronoElement getChildAtFloor(T context) {
return this.getChild();
}
@Override
public ChronoElement getChildAtCeiling(T context) {
return this.getChild();
}
private ChronoElement getChild() {
return Weekmodel.ISO.weekOfYear();
}
private static PlainDate setYearOfWeekdate(
PlainDate date,
int value
) {
int dowCurrent = getFirstCalendarWeekAsDayOfYear(value);
int weekOfYear = getWeekOfYear(date);
int dayOfWeek = date.getDayOfWeek().getValue(Weekmodel.ISO);
long unixDays =
EpochDays.UNIX.transform(
GregorianMath.toMJD(value, 1, 1),
EpochDays.MODIFIED_JULIAN_DATE)
+ (dowCurrent - 1)
+ (weekOfYear - 1) * 7
+ (dayOfWeek - 1);
if (weekOfYear == 53) {
int wNext =
getFirstCalendarWeekAsDayOfYear(value + 1)
+ (GregorianMath.isLeapYear(value) ? 366 : 365);
if (((wNext - dowCurrent) / 7) < 53) {
unixDays -= 7; // weekOfYear = 52
}
}
return date.withDaysSinceUTC(unixDays - 2 * 365);
}
}
}
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