org.bardframework.time.zone.Ser Maven / Gradle / Ivy
Show all versions of jalali-date Show documentation
package org.bardframework.time.zone;
import java.io.*;
import java.time.ZoneOffset;
/**
* The shared serialization delegate for this package.
*
* This class is mutable and should be created once per serialization.
*/
final class Ser implements Externalizable {
/**
* Type for ZoneRules.
*/
static final byte ZRULES = 1;
/**
* Type for ZoneOffsetTransition.
*/
static final byte ZOT = 2;
/**
* Type for ZoneOffsetTransitionRule.
*/
static final byte ZOTRULE = 3;
/**
* Serialization version.
*/
private static final long serialVersionUID = -8885321777449118786L;
/**
* The type being serialized.
*/
private byte type;
/**
* The object being serialized.
*/
private Serializable object;
/**
* Constructor for deserialization.
*/
public Ser() {
}
/**
* Creates an instance for serialization.
*
* @param type the type
* @param object the object
*/
Ser(byte type, Serializable object) {
this.type = type;
this.object = object;
}
//-----------------------------------------------------------------------
static void write(Object object, DataOutput out) throws IOException {
writeInternal(ZRULES, object, out);
}
private static void writeInternal(byte type, Object object, DataOutput out) throws IOException {
out.writeByte(type);
switch (type) {
case ZRULES:
((ZoneRules) object).writeExternal(out);
break;
case ZOT:
((ZoneOffsetTransition) object).writeExternal(out);
break;
case ZOTRULE:
((ZoneOffsetTransitionRule) object).writeExternal(out);
break;
default:
throw new InvalidClassException("Unknown serialized type");
}
}
static Serializable read(DataInput in) throws IOException, ClassNotFoundException {
byte type = in.readByte();
return readInternal(type, in);
}
//-----------------------------------------------------------------------
private static Serializable readInternal(byte type, DataInput in)
throws IOException, ClassNotFoundException {
switch (type) {
case ZRULES:
return ZoneRules.readExternal(in);
case ZOT:
return ZoneOffsetTransition.readExternal(in);
case ZOTRULE:
return ZoneOffsetTransitionRule.readExternal(in);
default:
throw new StreamCorruptedException("Unknown serialized type");
}
}
/**
* Writes the state to the stream.
*
* @param offset the offset, not null
* @param out the output stream, not null
* @throws IOException if an error occurs
*/
static void writeOffset(ZoneOffset offset, DataOutput out) throws IOException {
final int offsetSecs = offset.getTotalSeconds();
int offsetByte = offsetSecs % 900 == 0 ? offsetSecs / 900 : 127; // compress to -72 to +72
out.writeByte(offsetByte);
if (offsetByte == 127) {
out.writeInt(offsetSecs);
}
}
/**
* Reads the state from the stream.
*
* @param in the input stream, not null
* @return the created object, not null
* @throws IOException if an error occurs
*/
static ZoneOffset readOffset(DataInput in) throws IOException {
int offsetByte = in.readByte();
return (offsetByte == 127 ? ZoneOffset.ofTotalSeconds(in.readInt()) : ZoneOffset.ofTotalSeconds(offsetByte * 900));
}
/**
* Writes the state to the stream.
*
* @param epochSec the epoch seconds, not null
* @param out the output stream, not null
* @throws IOException if an error occurs
*/
static void writeEpochSec(long epochSec, DataOutput out) throws IOException {
if (epochSec >= -4575744000L && epochSec < 10413792000L && epochSec % 900 == 0) { // quarter hours between 1825 and 2300
int store = (int) ((epochSec + 4575744000L) / 900);
out.writeByte((store >>> 16) & 255);
out.writeByte((store >>> 8) & 255);
out.writeByte(store & 255);
} else {
out.writeByte(255);
out.writeLong(epochSec);
}
}
//-----------------------------------------------------------------------
/**
* Reads the state from the stream.
*
* @param in the input stream, not null
* @return the epoch seconds, not null
* @throws IOException if an error occurs
*/
static long readEpochSec(DataInput in) throws IOException {
int hiByte = in.readByte() & 255;
if (hiByte == 255) {
return in.readLong();
} else {
int midByte = in.readByte() & 255;
int loByte = in.readByte() & 255;
long tot = ((hiByte << 16) + (midByte << 8) + loByte);
return (tot * 900) - 4575744000L;
}
}
/**
* Implements the {@code Externalizable} interface to write the object.
*
* @param out the data stream to write to, not null
* @serialData Each serializable class is mapped to a type that is the first byte
* in the stream. Refer to each class {@code writeReplace}
* serialized form for the value of the type and sequence of values for the type.
*
*
* - ZoneRules.writeReplace
*
- ZoneOffsetTransition.writeReplace
*
- ZoneOffsetTransitionRule.writeReplace
*
*/
@Override
public void writeExternal(ObjectOutput out) throws IOException {
writeInternal(type, object, out);
}
//-----------------------------------------------------------------------
/**
* Implements the {@code Externalizable} interface to read the object.
*
* @param in the data to read, not null
* @serialData The streamed type and parameters defined by the type's {@code writeReplace}
* method are read and passed to the corresponding static factory for the type
* to create a new instance. That instance is returned as the de-serialized
* {@code Ser} object.
*
*
* - ZoneRules
* - {@code ZoneRules.of(standardTransitions, standardOffsets, savingsInstantTransitions, wallOffsets, lastRules);}
*
- ZoneOffsetTransition
* - {@code ZoneOffsetTransition of(LocalDateTimeJalali.ofEpochSecond(epochSecond), offsetBefore, offsetAfter);}
*
- ZoneOffsetTransitionRule
* - {@code ZoneOffsetTransitionRule.of(month, dom, dow, time, timeEndOfDay, timeDefinition, standardOffset, offsetBefore, offsetAfter);}
*
*/
@Override
public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
type = in.readByte();
object = readInternal(type, in);
}
/**
* Returns the object that will replace this one.
*
* @return the read object, should never be null
*/
private Object readResolve() {
return object;
}
}