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* Copyright (c) 2013, impossibl.com
* All rights reserved.
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* modification, are permitted provided that the following conditions are met:
*
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* notice, this list of conditions and the following disclaimer in the
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* be used to endorse or promote products derived from this software
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*
* 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
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package com.impossibl.postgres.system.procs;
import com.impossibl.postgres.datetime.TimeZones;
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.datetime.instants.PreciseInstant;
import com.impossibl.postgres.system.Context;
import com.impossibl.postgres.types.PrimitiveType;
import com.impossibl.postgres.types.Type;
import static com.impossibl.postgres.system.Settings.FIELD_DATETIME_FORMAT_CLASS;
import static com.impossibl.postgres.types.PrimitiveType.TimestampTZ;
import java.io.IOException;
import java.util.Calendar;
import java.util.HashMap;
import java.util.Map;
import java.util.TimeZone;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import io.netty.buffer.ByteBuf;
public class Timestamps extends SettingSelectProcProvider {
private static final long PG_JAVA_EPOCH_DIFF_MICROS = calculateEpochDifferenceMicros();
private TimeZone zone;
private PrimitiveType primitiveType;
public Timestamps(PrimitiveType primitiveType, String... baseNames) {
super(FIELD_DATETIME_FORMAT_CLASS, Integer.class,
null, null, null, null,
null, null, null, null,
baseNames);
this.primitiveType = primitiveType;
this.zone = primitiveType == TimestampTZ ? TimeZones.UTC : null;
this.matchedBinEncoder = new BinIntegerEncoder();
this.matchedBinDecoder = new BinIntegerDecoder();
this.matchedTxtEncoder = this.unmatchedTxtEncoder = new TxtEncoder();
this.matchedTxtDecoder = this.unmatchedTxtDecoder = new TxtDecoder();
}
class BinIntegerDecoder extends BinaryDecoder {
@Override
public PrimitiveType getInputPrimitiveType() {
return primitiveType;
}
@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 != 8) {
throw new IOException("invalid length");
}
long micros = buffer.readLong();
if (micros == Long.MAX_VALUE) {
return FutureInfiniteInstant.INSTANCE;
}
else if (micros == Long.MIN_VALUE) {
return PastInfiniteInstant.INSTANCE;
}
micros += PG_JAVA_EPOCH_DIFF_MICROS;
if (zone != null)
return new PreciseInstant(Instant.Type.Timestamp, micros, zone);
else
return new AmbiguousInstant(Instant.Type.Timestamp, micros);
}
}
class BinIntegerEncoder extends BinaryEncoder {
@Override
public Class<?> getInputType() {
return Instant.class;
}
@Override
public PrimitiveType getOutputPrimitiveType() {
return primitiveType;
}
@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;
long micros;
if (primitiveType == PrimitiveType.TimestampTZ) {
micros = inst.getMicrosUTC();
}
else {
micros = inst.disambiguate(TimeZone.getDefault()).getMicrosLocal();
}
if (!isInfinity(micros)) {
micros -= PG_JAVA_EPOCH_DIFF_MICROS;
}
buffer.writeInt(8);
buffer.writeLong(micros);
}
}
@Override
public int length(Type type, Object val, Context context) throws IOException {
return val == null ? 4 : 12;
}
}
private static long calculateEpochDifferenceMicros() {
Calendar pgEpochInJava = Calendar.getInstance(TimeZone.getTimeZone("GMT"));
pgEpochInJava.clear();
pgEpochInJava.set(2000, 0, 1);
return MILLISECONDS.toMicros(pgEpochInJava.getTimeInMillis());
}
public static boolean isInfinity(long micros) {
return micros == Long.MAX_VALUE || micros == Long.MIN_VALUE;
}
class TxtDecoder extends TextDecoder {
@Override
public PrimitiveType getInputPrimitiveType() {
return primitiveType;
}
@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.getTimestampFormatter().getParser().parse(buffer.toString(), 0, pieces);
Instant instant = Instants.timestampFromPieces(pieces, context.getTimeZone());
if (primitiveType != PrimitiveType.TimestampTZ) {
instant = instant.ambiguate();
}
return instant;
}
}
class TxtEncoder extends TextEncoder {
@Override
public PrimitiveType getOutputPrimitiveType() {
return primitiveType;
}
@Override
public Class<?> getInputType() {
return Instant.class;
}
@Override
void encode(Type type, StringBuilder buffer, Object val, Context context) throws IOException {
String strVal = context.getTimestampFormatter().getPrinter().format((Instant) val);
buffer.append(strVal);
}
}
}