com.datastax.driver.extras.codecs.jdk8.LocalDateTimeCodec Maven / Gradle / Ivy
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/*
* Copyright 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 static com.datastax.driver.core.ParseUtils.isLongLiteral;
import static com.datastax.driver.core.ParseUtils.quote;
import com.datastax.driver.core.DataType;
import com.datastax.driver.core.IgnoreJDK6Requirement;
import com.datastax.driver.core.ParseUtils;
import com.datastax.driver.core.ProtocolVersion;
import com.datastax.driver.core.TypeCodec;
import com.datastax.driver.core.exceptions.InvalidTypeException;
import java.nio.ByteBuffer;
/**
* {@link TypeCodec} that maps {@link java.time.LocalDateTime} to CQL {@code timestamp}, allowing
* the setting and retrieval of {@code timestamp} columns as {@link java.time.LocalDateTime}
* instances.
*
* 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.LocalDateTime} will be lost when persisted to Cassandra.
*
* @see 'Working with
* timestamps' section of CQL specification
*/
@IgnoreJDK6Requirement
@SuppressWarnings("Since15")
public class LocalDateTimeCodec extends TypeCodec {
private static final java.time.format.DateTimeFormatter FORMATTER =
java.time.format.DateTimeFormatter.ISO_LOCAL_DATE_TIME;
public static final LocalDateTimeCodec instance = new LocalDateTimeCodec();
private LocalDateTimeCodec() {
super(DataType.timestamp(), java.time.LocalDateTime.class);
}
@Override
public ByteBuffer serialize(java.time.LocalDateTime value, ProtocolVersion protocolVersion) {
if (value == null) {
return null;
}
long millis = value.atZone(java.time.ZoneOffset.UTC).toInstant().toEpochMilli();
return bigint().serializeNoBoxing(millis, protocolVersion);
}
@Override
public java.time.LocalDateTime deserialize(ByteBuffer bytes, ProtocolVersion protocolVersion) {
if (bytes == null || bytes.remaining() == 0) {
return null;
}
long millis = bigint().deserializeNoBoxing(bytes, protocolVersion);
return java.time.LocalDateTime.ofInstant(
java.time.Instant.ofEpochMilli(millis), java.time.ZoneOffset.UTC);
}
@Override
public String format(java.time.LocalDateTime value) {
if (value == null) {
return "NULL";
}
return quote(FORMATTER.format(value));
}
@Override
public java.time.LocalDateTime parse(String value) {
if (value == null || value.isEmpty() || value.equalsIgnoreCase("NULL")) {
return null;
}
// strip enclosing single quotes, if any
if (ParseUtils.isQuoted(value)) {
value = ParseUtils.unquote(value);
}
if (isLongLiteral(value)) {
try {
long millis = Long.parseLong(value);
return java.time.LocalDateTime.ofInstant(
java.time.Instant.ofEpochMilli(millis), java.time.ZoneOffset.UTC);
} catch (NumberFormatException e) {
throw new InvalidTypeException(
String.format("Cannot parse timestamp value from \"%s\"", value));
}
}
try {
return java.time.LocalDateTime.from(FORMATTER.parse(value));
} catch (java.time.format.DateTimeParseException e) {
throw new InvalidTypeException(
String.format("Cannot parse timestamp value from \"%s\"", value));
}
}
}