com.datastax.driver.extras.codecs.jdk8.InstantCodec Maven / Gradle / Ivy

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Extended functionality for the Java driver.
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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.isQuoted;
import static com.datastax.driver.core.ParseUtils.quote;
import static com.datastax.driver.core.ParseUtils.unquote;
import static java.lang.Long.parseLong;

import com.datastax.driver.core.DataType;
import com.datastax.driver.core.IgnoreJDK6Requirement;
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.Instant} to CQL {@code timestamp} allowing the
 * setting and retrieval of {@code timestamp} columns as {@link java.time.Instant} instances.
 *
 * Since C* timestamp columns do not preserve timezones any attached timezone
 * information will be lost.
 *
 * IMPORTANT: this codec's {@link #format(java.time.Instant) format} method
 * formats timestamps using an ISO-8601 format that includes milliseconds. This format is
 * incompatible with Cassandra versions < 2.0.9.
 *
 * @see ZonedDateTimeCodec
 * @see 'Working with
 *     timestamps' section of CQL specification
 */
@IgnoreJDK6Requirement
@SuppressWarnings("Since15")
public class InstantCodec extends TypeCodec {

  public static final InstantCodec instance = new InstantCodec();

  /**
   * A {@link java.time.format.DateTimeFormatter} that parses (most) of the ISO formats accepted in
   * CQL.
   */
  private static final java.time.format.DateTimeFormatter PARSER =
      new java.time.format.DateTimeFormatterBuilder()
          .parseCaseSensitive()
          .parseStrict()
          .append(java.time.format.DateTimeFormatter.ISO_LOCAL_DATE)
          .optionalStart()
          .appendLiteral('T')
          .appendValue(java.time.temporal.ChronoField.HOUR_OF_DAY, 2)
          .appendLiteral(':')
          .appendValue(java.time.temporal.ChronoField.MINUTE_OF_HOUR, 2)
          .optionalEnd()
          .optionalStart()
          .appendLiteral(':')
          .appendValue(java.time.temporal.ChronoField.SECOND_OF_MINUTE, 2)
          .optionalEnd()
          .optionalStart()
          .appendFraction(java.time.temporal.ChronoField.NANO_OF_SECOND, 0, 9, true)
          .optionalEnd()
          .optionalStart()
          .appendZoneId()
          .optionalEnd()
          .toFormatter()
          .withZone(java.time.ZoneOffset.UTC);

  private static final java.time.format.DateTimeFormatter FORMATTER =
      java.time.format.DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss.SSSxxx")
          .withZone(java.time.ZoneOffset.UTC);

  private InstantCodec() {
    super(DataType.timestamp(), java.time.Instant.class);
  }

  @Override
  public ByteBuffer serialize(java.time.Instant value, ProtocolVersion protocolVersion) {
    return value == null ? null : bigint().serializeNoBoxing(value.toEpochMilli(), protocolVersion);
  }

  @Override
  public java.time.Instant deserialize(ByteBuffer bytes, ProtocolVersion protocolVersion) {
    return bytes == null || bytes.remaining() == 0
        ? null
        : java.time.Instant.ofEpochMilli(bigint().deserializeNoBoxing(bytes, protocolVersion));
  }

  @Override
  public String format(java.time.Instant value) {
    if (value == null) return "NULL";
    return quote(FORMATTER.format(value));
  }

  @Override
  public java.time.Instant parse(String value) {
    if (value == null || value.isEmpty() || value.equalsIgnoreCase("NULL")) return null;
    // strip enclosing single quotes, if any
    if (isQuoted(value)) value = unquote(value);
    if (isLongLiteral(value)) {
      try {
        return java.time.Instant.ofEpochMilli(parseLong(value));
      } catch (NumberFormatException e) {
        throw new InvalidTypeException(
            String.format("Cannot parse timestamp value from \"%s\"", value));
      }
    }
    try {
      return java.time.Instant.from(PARSER.parse(value));
    } catch (java.time.format.DateTimeParseException e) {
      throw new InvalidTypeException(
          String.format("Cannot parse timestamp value from \"%s\"", value));
    }
  }
}