com.datastax.driver.extras.codecs.joda.LocalDateCodec 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.joda;

import static com.datastax.driver.core.CodecUtils.fromCqlDateToDaysSinceEpoch;
import static com.datastax.driver.core.CodecUtils.fromSignedToUnsignedInt;
import static com.datastax.driver.core.CodecUtils.fromUnsignedToSignedInt;
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 static org.joda.time.Days.daysBetween;

import com.datastax.driver.core.DataType;
import com.datastax.driver.core.ProtocolVersion;
import com.datastax.driver.core.TypeCodec;
import com.datastax.driver.core.exceptions.InvalidTypeException;
import java.nio.ByteBuffer;
import org.joda.time.Days;
import org.joda.time.LocalDate;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;

/** {@link TypeCodec} that maps {@link org.joda.time.LocalDate} to CQL {@code date}. */
public class LocalDateCodec extends TypeCodec {

  public static final LocalDateCodec instance = new LocalDateCodec();

  private static final LocalDate EPOCH = new LocalDate(1970, 1, 1);

  private static final DateTimeFormatter FORMATTER =
      DateTimeFormat.forPattern("yyyy-MM-dd").withZoneUTC();

  private LocalDateCodec() {
    super(DataType.date(), LocalDate.class);
  }

  @Override
  public ByteBuffer serialize(LocalDate value, ProtocolVersion protocolVersion) {
    if (value == null) return null;
    Days days = daysBetween(EPOCH, value);
    int unsigned = fromSignedToUnsignedInt(days.getDays());
    return cint().serializeNoBoxing(unsigned, protocolVersion);
  }

  @Override
  public LocalDate deserialize(ByteBuffer bytes, ProtocolVersion protocolVersion) {
    if (bytes == null || bytes.remaining() == 0) return null;
    int unsigned = cint().deserializeNoBoxing(bytes, protocolVersion);
    int signed = fromUnsignedToSignedInt(unsigned);
    return EPOCH.plusDays(signed);
  }

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

  @Override
  public LocalDate parse(String value) {
    if (value == null || value.isEmpty() || value.equalsIgnoreCase("NULL")) return null;

    // single quotes are optional for long literals, mandatory for date patterns
    // strip enclosing single quotes, if any
    if (isQuoted(value)) {
      value = unquote(value);
    }

    if (isLongLiteral(value)) {
      long raw;
      try {
        raw = parseLong(value);
      } catch (NumberFormatException e) {
        throw new InvalidTypeException(String.format("Cannot parse date value from \"%s\"", value));
      }
      int days;
      try {
        days = fromCqlDateToDaysSinceEpoch(raw);
      } catch (IllegalArgumentException e) {
        throw new InvalidTypeException(String.format("Cannot parse date value from \"%s\"", value));
      }
      return EPOCH.plusDays(days);
    }

    try {
      return LocalDate.parse(value, FORMATTER);
    } catch (RuntimeException e) {
      throw new InvalidTypeException(String.format("Cannot parse date value from \"%s\"", value));
    }
  }
}