/**
* Copyright (c) 2013, impossibl.com
* 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 impossibl.com 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 A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* POSSIBILITY OF SUCH DAMAGE.
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package com.impossibl.postgres.system.procs;
import com.impossibl.postgres.datetime.instants.AmbiguousInstant;
import com.impossibl.postgres.datetime.instants.FutureInfiniteInstant;
import com.impossibl.postgres.datetime.instants.Instant;
import com.impossibl.postgres.datetime.instants.Instants;
import com.impossibl.postgres.datetime.instants.PastInfiniteInstant;
import com.impossibl.postgres.system.Context;
import com.impossibl.postgres.types.PrimitiveType;
import com.impossibl.postgres.types.Type;
import static com.impossibl.postgres.types.PrimitiveType.Date;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import static java.util.concurrent.TimeUnit.DAYS;
import static java.util.concurrent.TimeUnit.MICROSECONDS;
import static java.util.concurrent.TimeUnit.SECONDS;
import io.netty.buffer.ByteBuf;
public class Dates extends SimpleProcProvider {
public Dates() {
super(new TxtEncoder(), new TxtDecoder(), new BinEncoder(), new BinDecoder(), "date_");
}
static class BinDecoder extends BinaryDecoder {
@Override
public PrimitiveType getInputPrimitiveType() {
return Date;
}
@Override
public Class<?> getOutputType() {
return Instant.class;
}
@Override
public Instant decode(Type type, Short typeLength, Integer typeModifier, ByteBuf buffer, Context context) throws IOException {
int length = buffer.readInt();
if (length == -1) {
return null;
}
else if (length != 4) {
throw new IOException("invalid length");
}
int daysPg = buffer.readInt();
if (daysPg == Integer.MAX_VALUE) {
return FutureInfiniteInstant.INSTANCE;
}
else if (daysPg == Integer.MIN_VALUE) {
return PastInfiniteInstant.INSTANCE;
}
long micros = toJavaMicros(daysPg);
return new AmbiguousInstant(Instant.Type.Date, micros);
}
}
static class BinEncoder extends BinaryEncoder {
@Override
public Class<?> getInputType() {
return Instant.class;
}
@Override
public PrimitiveType getOutputPrimitiveType() {
return Date;
}
@Override
public void encode(Type type, ByteBuf buffer, Object val, Context context) throws IOException {
if (val == null) {
buffer.writeInt(-1);
}
else {
Instant inst = (Instant) val;
int daysPg;
if (inst.getType() == Instant.Type.Infinity) {
daysPg = inst.getMicrosLocal() < 0 ? Integer.MIN_VALUE : Integer.MAX_VALUE;
}
else {
daysPg = toPgDays(inst);
}
buffer.writeInt(4);
buffer.writeInt(daysPg);
}
}
@Override
public int length(Type type, Object val, Context context) throws IOException {
return val == null ? 4 : 8;
}
}
private static final long PG_EPOCH_SECS = 946684800L;
static final long DAY_SECS = DAYS.toSeconds(1);
static final long CUTOFF_1_START_SECS = -13165977600L; // October 15, 1582 -> October 4, 1582
static final long CUTOFF_1_END_SECS = -12219292800L;
static final long CUTOFF_2_START_SECS = -15773356800L; // 1500-03-01 -> 1500-02-28
static final long CUTOFF_2_END_SECS = -14825808000L;
static final long APPROX_YEAR_SECS1 = -3155823050L;
static final long APPROX_YEAR_SECS2 = 3155760000L;
private static int toPgDays(Instant a) {
long secs = MICROSECONDS.toSeconds(a.getMicrosLocal());
secs -= PG_EPOCH_SECS;
// Julian/Greagorian calendar cutoff point
if (secs < CUTOFF_1_START_SECS) {
secs -= DAY_SECS * 10;
if (secs < CUTOFF_2_START_SECS) {
int years = (int) ((secs - CUTOFF_2_START_SECS) / APPROX_YEAR_SECS1);
years++;
years -= years / 4;
secs += years * DAY_SECS;
}
}
return (int) Math.floor((double)secs / (double)DAY_SECS);
}
private static long toJavaMicros(long days) {
long secs = DAYS.toSeconds(days);
secs += PG_EPOCH_SECS;
// Julian/Gregorian calendar cutoff point
if (secs < CUTOFF_1_END_SECS) {
secs += DAY_SECS * 10;
if (secs < CUTOFF_2_END_SECS) {
int extraLeaps = (int) ((secs - CUTOFF_2_END_SECS) / APPROX_YEAR_SECS2);
extraLeaps--;
extraLeaps -= extraLeaps / 4;
secs += extraLeaps * DAY_SECS;
}
}
return SECONDS.toMicros(secs);
}
static class TxtDecoder extends TextDecoder {
@Override
public PrimitiveType getInputPrimitiveType() {
return PrimitiveType.Date;
}
@Override
public Class<?> getOutputType() {
return Instant.class;
}
@Override
Object decode(Type type, Short typeLength, Integer typeModifier, CharSequence buffer, Context context) throws IOException {
Map<String, Object> pieces = new HashMap<>();
context.getDateFormatter().getParser().parse(buffer.toString(), 0, pieces);
return Instants.dateFromPieces(pieces, context.getTimeZone()).ambiguate();
}
}
static class TxtEncoder extends TextEncoder {
@Override
public PrimitiveType getOutputPrimitiveType() {
return PrimitiveType.Date;
}
@Override
public Class<?> getInputType() {
return Instant.class;
}
@Override
void encode(Type type, StringBuilder buffer, Object val, Context context) throws IOException {
String strVal = context.getDateFormatter().getPrinter().format((Instant) val);
buffer.append(strVal);
}
}
}