net.time4j.SPX Maven / Gradle / Ivy
/*
* -----------------------------------------------------------------------
* Copyright © 2013-2015 Meno Hochschild, Serialisierungsform für das Hauptpaket.
*
* Der Name "SPX" steht für Serialization ProXy.
* Die Design-Idee stammt von Joshua Bloch in seinem populären Buch
* "Effective Java" (Item 78). Zwar ist der Serialisierungsaufwand
* im Vergleich zur Standard-Serialisierungsform etwas höher, jedoch
* kann dieser Nachteil durch verringerte Header-Größen mit besseren
* Netzlaufzeiten besonders bei kleinen Objektgraphen kompensiert werden. Die
* Kompensation wird durch die Verwendung eines kurzen Klassennamens, durch
* die gemeinsame Nutzung (shared mode) dieser Klasse durch mehrere
* zu serialisierende Objekte und durch eine bit-komprimierte Datendarstellung
* gewährleistet.
*
* @author Meno Hochschild
* @serial include
*/
final class SPX
implements Externalizable {
//~ Statische Felder/Initialisierungen ----------------------------
/** Serialisierungstyp von {@code PlainDate}. */
static final int DATE_TYPE = 1;
/** Serialisierungstyp von {@code PlainTime}. */
static final int TIME_TYPE = 2;
/** Serialisierungstyp von {@code Weekmodel}. */
static final int WEEKMODEL_TYPE = 3;
/** Serialisierungstyp von {@code Moment}. */
static final int MOMENT_TYPE = 4;
/** Serialisierungstyp von {@code Duration}. */
static final int DURATION_TYPE = 6;
/** Serialisierungstyp von {@code DayPeriod.Element}. */
static final int DAY_PERIOD_TYPE = 7;
/** Serialisierungstyp von {@code PlainTimestamp}. */
static final int TIMESTAMP_TYPE = 8;
private static final long serialVersionUID = 1L;
//~ Instanzvariablen ----------------------------------------------
private transient Object obj;
private transient int type;
//~ Konstruktoren -------------------------------------------------
/**
* Benutzt in der Deserialisierung gemäß dem Kontrakt
* von {@code Externalizable}.
*/
public SPX() {
super();
}
/**
* Benutzt in der Serialisierung (writeReplace).
*
* @param obj object to be serialized
* @param type serialization type (corresponds to type of obj)
*/
SPX(
Object obj,
int type
) {
super();
this.obj = obj;
this.type = type;
}
//~ Methoden ------------------------------------------------------
/**
* Implementation method of interface {@link Externalizable}.
*
* The first byte contains within the 4 most-significant bits the type
* of the object to be serialized. Then the data bytes follow in a
* bit-compressed representation.
*
* @serialData data layout see {@code writeReplace()}-method of object
* to be serialized
* @param out output stream
* @throws IOException in any case of IO-failures
*/
/*[deutsch]
* Implementierungsmethode des Interface {@link Externalizable}.
*
* Das erste Byte enthält um 4 Bits nach links verschoben den
* Typ des zu serialisierenden Objekts. Danach folgen die Daten-Bits
* in einer bit-komprimierten Darstellung.
*
* @serialData data layout see {@code writeReplace()}-method of object
* to be serialized
* @param out output stream
* @throws IOException in any case of IO-failures
*/
@Override
public void writeExternal(ObjectOutput out)
throws IOException {
switch (this.type) {
case DATE_TYPE:
this.writeDate(out);
break;
case TIME_TYPE:
this.writeTime(out);
break;
case WEEKMODEL_TYPE:
this.writeWeekmodel(out);
break;
case MOMENT_TYPE:
this.writeMoment(out);
break;
case DURATION_TYPE:
this.writeDuration(out);
break;
case DAY_PERIOD_TYPE:
this.writeDayPeriod(out);
break;
case TIMESTAMP_TYPE:
this.writeTimestamp(out);
break;
default:
throw new InvalidClassException("Unknown serialized type.");
}
}
/**
* Implementation method of interface {@link Externalizable}.
*
* @param in input stream
* @throws IOException in any case of IO-failures
* @throws ClassNotFoundException if class-loading fails
*/
/*[deutsch]
* Implementierungsmethode des Interface {@link Externalizable}.
*
* @param in input stream
* @throws IOException in any case of IO-failures
* @throws ClassNotFoundException if class-loading fails
*/
@Override
public void readExternal(ObjectInput in)
throws IOException, ClassNotFoundException {
byte header = in.readByte();
switch ((header & 0xFF) >> 4) {
case DATE_TYPE:
this.obj = this.readDate(in, header);
break;
case TIME_TYPE:
this.obj = this.readTime(in);
break;
case WEEKMODEL_TYPE:
this.obj = this.readWeekmodel(in, header);
break;
case MOMENT_TYPE:
this.obj = this.readMoment(in, header);
break;
case DURATION_TYPE:
this.obj = this.readDuration(in, header);
break;
case DAY_PERIOD_TYPE:
this.obj = this.readDayPeriod(in, header);
break;
case TIMESTAMP_TYPE:
this.obj = this.readTimestamp(in, header);
break;
default:
throw new StreamCorruptedException("Unknown serialized type.");
}
}
private Object readResolve() throws ObjectStreamException {
return this.obj;
}
private void writeDate(DataOutput out)
throws IOException {
PlainDate date = (PlainDate) this.obj;
writeDate(date, DATE_TYPE, out);
}
private static void writeDate(
PlainDate date,
int type,
DataOutput out
) throws IOException {
int year = date.getYear();
// Bit 0-3 => type (4)
// Bit 4-7 => month (4)
// Bit 8 => unused
// Bit 9-10 => year-range (2)
// Bit 11-15 => day-of-month (5)
// byte - short - int => year
int range;
if (year >= 1850 && year <= 2100) {
range = 1;
} else if (Math.abs(year) < 10000) {
range = 2;
} else {
range = 3;
}
int header = type;
header <<= 4;
header |= date.getMonth();
out.writeByte(header);
int header2 = range;
header2 <<= 5;
header2 |= date.getDayOfMonth();
out.writeByte(header2);
if (range == 1) {
out.writeByte(year - 1850 - 128);
} else if (range == 2) {
out.writeShort(year);
} else {
out.writeInt(year);
}
}
private PlainDate readDate(
DataInput in,
byte header
) throws IOException {
int month = header & 0xF;
int header2 = in.readByte();
int range = (header2 >> 5) & 3;
int day = header2 & 31;
int year;
switch (range) {
case 1:
year = in.readByte() + 1850 + 128;
break;
case 2:
year = in.readShort();
break;
case 3:
year = in.readInt();
break;
default:
throw new StreamCorruptedException("Unknown year range.");
}
return PlainDate.of(year, Month.valueOf(month), day);
}
private void writeTime(DataOutput out)
throws IOException {
PlainTime time = (PlainTime) this.obj;
out.writeByte(TIME_TYPE << 4);
writeTime(time, out);
}
private static void writeTime(
PlainTime time,
DataOutput out
) throws IOException {
if (time.getNanosecond() == 0) {
if (time.getSecond() == 0) {
if (time.getMinute() == 0) {
out.writeByte(~time.getHour());
} else {
out.writeByte(time.getHour());
out.writeByte(~time.getMinute());
}
} else {
out.writeByte(time.getHour());
out.writeByte(time.getMinute());
out.writeByte(~time.getSecond());
}
} else {
out.writeByte(time.getHour());
out.writeByte(time.getMinute());
out.writeByte(time.getSecond());
out.writeInt(time.getNanosecond());
}
}
private PlainTime readTime(DataInput in)
throws IOException {
int hour = in.readByte();
if (hour < 0) {
return PlainTime.of(~hour);
} else {
int second = 0, nano = 0;
int minute = in.readByte();
if (minute < 0) {
minute = ~minute;
} else {
second = in.readByte();
if (second < 0) {
second = ~second;
} else {
nano = in.readInt();
}
}
return PlainTime.of(hour, minute, second, nano);
}
}
private void writeWeekmodel(DataOutput out)
throws IOException {
Weekmodel wm = (Weekmodel) this.obj;
boolean isoWeekend = (
(wm.getStartOfWeekend() == Weekday.SATURDAY)
&& (wm.getEndOfWeekend() == Weekday.SUNDAY)
);
int header = WEEKMODEL_TYPE;
header <<= 4;
if (!isoWeekend) {
header |= 1;
}
out.writeByte(header);
int state = wm.getFirstDayOfWeek().getValue();
state <<= 4;
state |= wm.getMinimalDaysInFirstWeek();
out.writeByte(state);
if (!isoWeekend) {
state = wm.getStartOfWeekend().getValue();
state <<= 4;
state |= wm.getEndOfWeekend().getValue();
out.writeByte(state);
}
}
private Object readWeekmodel(
DataInput in,
byte header
) throws IOException {
int data = in.readByte();
Weekday firstDayOfWeek = Weekday.valueOf(data >> 4);
int minimalDaysInFirstWeek = (data & 0xF);
Weekday startOfWeekend = Weekday.SATURDAY;
Weekday endOfWeekend = Weekday.SUNDAY;
if ((header & 0xF) == 1) {
data = in.readByte();
startOfWeekend = Weekday.valueOf(data >> 4);
endOfWeekend = Weekday.valueOf(data & 0xF);
}
return Weekmodel.of(
firstDayOfWeek,
minimalDaysInFirstWeek,
startOfWeekend,
endOfWeekend
);
}
private void writeMoment(DataOutput out)
throws IOException {
Moment ut = (Moment) this.obj;
ut.writeTimestamp(out);
}
private Object readMoment(
DataInput in,
byte header
) throws IOException {
int lsBit = (header & 1);
int fractionBit = ((header & 2) >>> 1);
boolean positiveLS = (lsBit != 0);
boolean hasNanos = (fractionBit != 0);
return Moment.readTimestamp(in, positiveLS, hasNanos);
}
private void writeTimestamp(DataOutput out)
throws IOException {
PlainTimestamp ts = (PlainTimestamp) this.obj;
writeDate(ts.getCalendarDate(), TIMESTAMP_TYPE, out);
writeTime(ts.getWallTime(), out);
}
private Object readTimestamp(
DataInput in,
byte header
) throws IOException, ClassNotFoundException {
PlainDate date = readDate(in, header);
PlainTime time = readTime(in);
return PlainTimestamp.of(date, time);
}
private void writeDuration(ObjectOutput out)
throws IOException {
Duration d = Duration.class.cast(this.obj);
int size = d.getTotalLength().size();
boolean useLong = false;
for (int i = 0, n = Math.min(size, 6); i < n; i++ ) {
if (d.getTotalLength().get(i).getAmount() >= 1000) {
useLong = true;
break;
}
}
int header = DURATION_TYPE;
header <<= 4;
if (useLong) {
header |= 1;
}
out.writeByte(header);
out.writeInt(size);
for (int i = 0; i < size; i++ ) {
TimeSpan.Item item = d.getTotalLength().get(i);
if (useLong) {
out.writeLong(item.getAmount());
} else {
out.writeInt((int) item.getAmount());
}
out.writeObject(item.getUnit());
}
if (size > 0) {
out.writeBoolean(d.isNegative());
}
}
private Object readDuration(
ObjectInput in,
byte header
) throws IOException, ClassNotFoundException {
boolean useLong = ((header & 0xF) == 1);
int size = in.readInt();
if (size == 0) {
return Duration.ofZero();
}
List> items = new ArrayList<>(size);
for (int i = 0; i < size; i++) {
long amount = (useLong ? in.readLong() : in.readInt());
IsoUnit unit = (IsoUnit) in.readObject();
items.add(TimeSpan.Item.of(amount, unit));
}
boolean negative = in.readBoolean();
return new Duration<>(items, negative);
}
private void writeDayPeriod(ObjectOutput out)
throws IOException {
DayPeriod.Element element = DayPeriod.Element.class.cast(this.obj);
Locale locale = element.getLocale();
int header = DAY_PERIOD_TYPE;
header <<= 4;
if (element.isFixed()) {
header |= 1;
}
if (locale == null) {
header |= 2;
}
out.writeByte(header);
if (locale == null) {
out.writeObject(element.getCodeMap());
} else {
String lang = locale.getLanguage();
if (!locale.getCountry().isEmpty()) {
lang = lang + "-" + locale.getCountry();
}
out.writeUTF(lang);
out.writeUTF(element.getCalendarType());
}
}
@SuppressWarnings("unchecked")
private Object readDayPeriod(
ObjectInput in,
byte header
) throws IOException, ClassNotFoundException {
boolean fixed = ((header & 1) == 1);
boolean custom = ((header & 2) == 2);
if (custom) {
Map timeToLabels = (Map) in.readObject();
return new DayPeriod.Element(fixed, DayPeriod.of(timeToLabels));
}
String langCode = in.readUTF();
String calendarType = in.readUTF();
int index = langCode.indexOf("-");
Locale locale;
if (index == -1) {
locale = new Locale(langCode);
} else {
locale = new Locale(langCode.substring(0, index), langCode.substring(index + 1));
}
return new DayPeriod.Element(fixed, locale, calendarType);
}
}
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