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Cassandra support for Spring Data
/*
* Copyright 2016-2022 the original author or authors.
*
* 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
*
* https://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 org.springframework.data.cassandra.core.convert;
import static java.time.ZoneId.*;
import java.time.Instant;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.temporal.ChronoField;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.List;
import org.springframework.core.convert.converter.Converter;
import org.springframework.data.convert.ReadingConverter;
import org.springframework.data.convert.WritingConverter;
import org.springframework.lang.NonNull;
/**
* Helper class to register JodaTime specific {@link Converter} implementations in case the library is present on the
* classpath.
*
* @author Mark Paluch
* @author Hurelhuyag
* @since 1.5
*/
public abstract class CassandraJsr310Converters {
private CassandraJsr310Converters() {}
/**
* Returns the converters to be registered. Will only return converters in case we're running on Java 8.
*
* @return
*/
public static Collection> getConvertersToRegister() {
List> converters = new ArrayList<>();
converters.add(MillisOfDayToLocalTimeConverter.INSTANCE);
converters.add(LocalTimeToMillisOfDayConverter.INSTANCE);
converters.add(DateToInstantConverter.INSTANCE);
converters.add(InstantToDateConverter.INSTANCE);
converters.add(LocalDateTimeToInstantConverter.INSTANCE);
return converters;
}
/**
* Simple singleton to convert {@link Long}s to their {@link LocalTime} representation.
*
* @author Mark Paluch
* @since 2.1
*/
@ReadingConverter
public enum MillisOfDayToLocalTimeConverter implements Converter {
INSTANCE;
@Override
public LocalTime convert(Long source) {
return LocalTime.ofNanoOfDay(source);
}
}
/**
* Simple singleton to convert {@link LocalTime}s to their {@link Long} representation.
*
* @author Mark Paluch
* @since 2.1
*/
@ReadingConverter
public enum LocalTimeToMillisOfDayConverter implements Converter {
INSTANCE;
@Override
public Long convert(LocalTime source) {
return source.getLong(ChronoField.NANO_OF_DAY);
}
}
/**
* Simple singleton to convert {@link Date}s to their Cassandra {@link Instant} representation for the CQL Timestamp
* type. Used for Cassandra 3.x to 4.x driver migration where
*
* @since 3.0
*/
@WritingConverter
public enum DateToInstantConverter implements Converter {
INSTANCE;
@Override
public Instant convert(Date source) {
return source.toInstant();
}
}
@ReadingConverter
public enum InstantToDateConverter implements Converter {
INSTANCE;
@NonNull
@Override
public Date convert(Instant source) {
return Date.from(source);
}
}
/**
* Converter from {@link LocalDateTime} to {@link Instant}.
*
* @since 3.0
*/
@WritingConverter
enum LocalDateTimeToInstantConverter implements Converter {
INSTANCE;
@Override
public Instant convert(LocalDateTime source) {
return source.atZone(systemDefault()).toInstant();
}
}
}