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/*
* Copyright (C) 2012-2015 DataStax Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.datastax.driver.extras.codecs.jdk8;
import com.datastax.driver.core.*;
import com.datastax.driver.core.exceptions.InvalidTypeException;
import java.nio.ByteBuffer;
import java.util.List;
import static com.datastax.driver.core.ParseUtils.isLongLiteral;
import static com.datastax.driver.core.ParseUtils.quote;
import static com.google.common.base.Preconditions.checkArgument;
/**
* {@link TypeCodec} that maps
* {@link java.time.ZonedDateTime} to CQL {@code tuple},
* providing a pattern for maintaining timezone information in
* Cassandra.
*
* Since Cassandra's timestamp type preserves only
* milliseconds since epoch, any timezone information
* would normally be lost. By using a
* tuple<timestamp,varchar> a timezone can be
* persisted in the varchar field such that when the
* value is deserialized the timezone is preserved.
*
* IMPORTANT
*
* 1) The default timestamp formatter used by this codec produces CQL literals
* that may include milliseconds.
* This literal format is incompatible with Cassandra < 2.0.9.
*
* 2) Even if the ISO-8601 standard accepts timestamps with nanosecond precision,
* Cassandra timestamps have millisecond precision; therefore, any sub-millisecond
* value set on a {@link java.time.ZonedDateTime} will be lost when persisted to Cassandra.
*
* @see 'Working with timestamps' section of CQL specification
*/
@IgnoreJDK6Requirement
@SuppressWarnings("Since15")
public class ZonedDateTimeCodec extends TypeCodec.AbstractTupleCodec {
/**
* The default {@link java.time.format.DateTimeFormatter} that parses (most) of
* the ISO formats accepted in CQL.
*/
private static final java.time.format.DateTimeFormatter DEFAULT_DATE_TIME_FORMATTER = java.time.format.DateTimeFormatter.ISO_DATE_TIME.withZone(java.time.ZoneOffset.UTC);
/**
* The default {@link java.time.format.DateTimeFormatter} to parse and format zones.
* It will use a time-zone ID, such as {@code Europe/Paris}, or an offset, such as {@code +02:00},
* depending on the best available information.
*/
private static final java.time.format.DateTimeFormatter DEFAULT_ZONE_FORMATTER = new java.time.format.DateTimeFormatterBuilder()
.appendZoneOrOffsetId()
.toFormatter();
private final java.time.format.DateTimeFormatter dateTimeFormatter;
private final java.time.format.DateTimeFormatter zoneFormatter;
/**
* Creates a new {@link ZonedDateTimeCodec} for the given tuple
* and with default {@link java.time.format.DateTimeFormatter formatters} for
* both the timestamp and the zone components.
*
* The default formatters produce and parse CQL timestamp literals of the following form:
*
* - Timestamp component: an ISO-8601 full date and time pattern, including at least: year,
* month, day, hour and minutes, and optionally, seconds and milliseconds,
* followed by the zone ID {@code Z} (UTC),
* e.g. {@code 2010-06-30T02:01Z} or {@code 2010-06-30T01:20:47.999Z};
* note that timestamp components are always expressed in UTC time, hence the zone ID {@code Z}.
* - Zone component: a zone offset such as {@code -07:00}, or a zone ID such as {@code UTC} or {@code Europe/Paris},
* depending on what information is available.
*
*
* @param tupleType The tuple type this codec should handle.
* It must be a {@code tuple}.
* @throws IllegalArgumentException if the provided tuple type is not a {@code tuple}.
*/
public ZonedDateTimeCodec(TupleType tupleType) {
this(tupleType, DEFAULT_DATE_TIME_FORMATTER, DEFAULT_ZONE_FORMATTER);
}
/**
* Creates a new {@link ZonedDateTimeCodec} for the given tuple
* and with the provided {@link java.time.format.DateTimeFormatter formatters} for
* the timestamp and the zone components of the tuple.
*
* Use this constructor if you intend to customize the way the codec
* parses and formats timestamps and zones. Beware that Cassandra only accepts
* timestamp literals in some of the most common ISO-8601 formats;
* attempting to use non-standard formats could result in invalid CQL literals.
*
* @param tupleType The tuple type this codec should handle.
* It must be a {@code tuple}.
* @param dateTimeFormatter The {@link java.time.format.DateTimeFormatter DateTimeFormatter} to use
* to parse and format the timestamp component of the tuple.
* As a parser, it should be lenient enough to accept most of the ISO-8601 formats
* accepted by Cassandra as valid CQL literals.
* As a formatter, it should be configured to always format timestamps in UTC
* (see {@link java.time.format.DateTimeFormatter#withZone(java.time.ZoneId)}.
* @param zoneFormatter The {@link java.time.format.DateTimeFormatter DateTimeFormatter} to use
* to parse and format the zone component of the tuple.
* @throws IllegalArgumentException if the provided tuple type is not a {@code tuple}.
*/
public ZonedDateTimeCodec(TupleType tupleType, java.time.format.DateTimeFormatter dateTimeFormatter, java.time.format.DateTimeFormatter zoneFormatter) {
super(tupleType, java.time.ZonedDateTime.class);
this.dateTimeFormatter = dateTimeFormatter;
this.zoneFormatter = zoneFormatter;
List types = tupleType.getComponentTypes();
checkArgument(
types.size() == 2 && types.get(0).equals(DataType.timestamp()) && types.get(1).equals(DataType.varchar()),
"Expected tuple, got %s",
tupleType);
}
@Override
protected java.time.ZonedDateTime newInstance() {
return null;
}
@Override
protected ByteBuffer serializeField(java.time.ZonedDateTime source, int index, ProtocolVersion protocolVersion) {
if (index == 0) {
long millis = source.toInstant().toEpochMilli();
return bigint().serializeNoBoxing(millis, protocolVersion);
}
if (index == 1) {
return varchar().serialize(zoneFormatter.format(source), protocolVersion);
}
throw new IndexOutOfBoundsException("Tuple index out of bounds. " + index);
}
@Override
protected java.time.ZonedDateTime deserializeAndSetField(ByteBuffer input, java.time.ZonedDateTime target, int index, ProtocolVersion protocolVersion) {
if (index == 0) {
long millis = bigint().deserializeNoBoxing(input, protocolVersion);
return java.time.Instant.ofEpochMilli(millis).atZone(java.time.ZoneOffset.UTC);
}
if (index == 1) {
String zoneId = varchar().deserialize(input, protocolVersion);
return target.withZoneSameInstant(zoneFormatter.parse(zoneId, java.time.temporal.TemporalQueries.zone()));
}
throw new IndexOutOfBoundsException("Tuple index out of bounds. " + index);
}
@Override
protected String formatField(java.time.ZonedDateTime value, int index) {
if (index == 0) {
return quote(dateTimeFormatter.format(value));
}
if (index == 1) {
return quote(zoneFormatter.format(value));
}
throw new IndexOutOfBoundsException("Tuple index out of bounds. " + index);
}
@Override
protected java.time.ZonedDateTime parseAndSetField(String input, java.time.ZonedDateTime target, int index) {
if (index == 0) {
// strip enclosing single quotes, if any
if (ParseUtils.isQuoted(input))
input = ParseUtils.unquote(input);
if (isLongLiteral(input)) {
try {
long millis = Long.parseLong(input);
return java.time.ZonedDateTime.ofInstant(java.time.Instant.ofEpochMilli(millis), java.time.ZoneOffset.UTC);
} catch (NumberFormatException e) {
throw new InvalidTypeException(String.format("Cannot parse timestamp value from \"%s\"", input));
}
}
try {
return java.time.ZonedDateTime.from(dateTimeFormatter.parse(input));
} catch (java.time.format.DateTimeParseException e) {
throw new InvalidTypeException(String.format("Cannot parse timestamp value from \"%s\"", target));
}
}
if (index == 1) {
String zoneId = varchar().parse(input);
return target.withZoneSameInstant(zoneFormatter.parse(zoneId, java.time.temporal.TemporalQueries.zone()));
}
throw new IndexOutOfBoundsException("Tuple index out of bounds. " + index);
}
}