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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.joda;
import com.datastax.driver.core.*;
import com.datastax.driver.core.exceptions.InvalidTypeException;
import org.joda.time.DateTime;
import org.joda.time.DateTimeZone;
import org.joda.time.format.DateTimeFormatter;
import org.joda.time.format.ISODateTimeFormat;
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 DateTime} 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 ID can be
* persisted in the varchar field such that when the
* value is deserialized the timezone is
* preserved.
*
* IMPORTANT: this codec's {@link #format(Object) format} method formats
* timestamps as CQL literal strings using an ISO-8601 format that includes milliseconds.
* This format is incompatible with Cassandra versions < 2.0.9.
*
* @see 'Working with timestamps' section of CQL specification
*/
public class DateTimeCodec extends TypeCodec.AbstractTupleCodec {
/**
* A {@link DateTimeFormatter} that parses (most) of
* the ISO-8601 formats accepted in CQL.
*/
private static final DateTimeFormatter DEFAULT_PARSER = ISODateTimeFormat.dateOptionalTimeParser();
/**
* A {@link DateTimeFormatter} that prints timestamps
* with a full ISO-8601 date and time format, including the time zone (Z).
*/
private static final DateTimeFormatter DEFFAULT_PRINTER = ISODateTimeFormat.dateTime().withZoneUTC();
private final DateTimeFormatter parser;
private final DateTimeFormatter printer;
/**
* Creates a new {@link DateTimeCodec} for the given tuple,
* using a default parser and a default printer to handle
* the timestamp component of the tuple.
*
* The default formatter and printer produce and parse CQL timestamp literals of the following form:
*
* - The printer will always produce a full ISO-8601 date and time pattern, including year,
* month, day, hour, minutes, seconds and milliseconds,
* followed by the zone ID {@code Z} (UTC), e.g. {@code 2010-06-30T01:20:47.999Z};
* note that timestamp components are always printed in UTC time, hence the zone ID {@code Z}.
* - The parser accepts most ISO-8601 date and time patterns, the time part (minutes, seconds, milliseconds) being optional.
*
*
* Note that it is not possible to customize the parsing and printing of
* the zone component of the tuple. This codec prints either a zone offset such as {@code -07:00},
* or a zone ID such as {@code UTC} or {@code Europe/Paris},
* depending on what is the best 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 DateTimeCodec(TupleType tupleType) {
this(tupleType, DEFAULT_PARSER, DEFFAULT_PRINTER);
}
/**
* Creates a new {@link DateTimeCodec} for the given tuple,
* using the provided {@link DateTimeFormatter parser} and {@link DateTimeFormatter printer}
* to format and print the timestamp component of the tuple.
*
* Use this constructor if you intend to customize the way the codec
* parses and formats timestamps. 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.
*
* Note that it is not possible to customize the parsing and printing of
* the zone component of the tuple. This codec prints either 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}.
* @param parser The {@link DateTimeFormatter parser} to use
* to parse the timestamp component of the tuple.
* It should be lenient enough to accept most of the ISO-8601 formats
* accepted by Cassandra as valid CQL literals.
* @param printer The {@link DateTimeFormatter printer} to use
* to format the timestamp component of the tuple.
* This printer should be configured to always format timestamps in UTC
* (see {@link DateTimeFormatter#withZoneUTC()}.
* @throws IllegalArgumentException if the provided tuple type is not a {@code tuple}.
*/
public DateTimeCodec(TupleType tupleType, DateTimeFormatter parser, DateTimeFormatter printer) {
super(tupleType, DateTime.class);
this.parser = parser;
this.printer = printer;
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 DateTime newInstance() {
return null;
}
@Override
protected ByteBuffer serializeField(DateTime source, int index, ProtocolVersion protocolVersion) {
if (index == 0) {
long millis = source.getMillis();
return bigint().serializeNoBoxing(millis, protocolVersion);
}
if (index == 1) {
return varchar().serialize(source.getZone().getID(), protocolVersion);
}
throw new IndexOutOfBoundsException("Tuple index out of bounds. " + index);
}
@Override
protected DateTime deserializeAndSetField(ByteBuffer input, DateTime target, int index, ProtocolVersion protocolVersion) {
if (index == 0) {
long millis = bigint().deserializeNoBoxing(input, protocolVersion);
return new DateTime(millis);
}
if (index == 1) {
String zoneId = varchar().deserialize(input, protocolVersion);
return target.withZone(DateTimeZone.forID(zoneId));
}
throw new IndexOutOfBoundsException("Tuple index out of bounds. " + index);
}
@Override
protected String formatField(DateTime value, int index) {
if (index == 0) {
return quote(printer.print(value));
}
if (index == 1) {
return quote(value.getZone().getID());
}
throw new IndexOutOfBoundsException("Tuple index out of bounds. " + index);
}
@Override
protected DateTime parseAndSetField(String input, DateTime 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 new DateTime(millis);
} catch (NumberFormatException e) {
throw new InvalidTypeException(String.format("Cannot parse timestamp value from \"%s\"", input));
}
}
try {
return parser.parseDateTime(input);
} catch (RuntimeException e) {
throw new InvalidTypeException(String.format("Cannot parse timestamp value from \"%s\"", target));
}
}
if (index == 1) {
String zoneId = varchar().parse(input);
// Joda time does not recognize "Z"
if ("Z".equals(zoneId))
return target.withZone(DateTimeZone.UTC);
return target.withZone(DateTimeZone.forID(zoneId));
}
throw new IndexOutOfBoundsException("Tuple index out of bounds. " + index);
}
}