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Cassandra support for Spring Data
/*
* Copyright 2016-2020 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 java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.TimeUnit;
import org.springframework.core.convert.converter.Converter;
import org.springframework.data.cassandra.core.mapping.CassandraType;
import org.springframework.data.convert.ReadingConverter;
import org.springframework.data.convert.ThreeTenBackPortConverters;
import org.springframework.data.convert.WritingConverter;
import org.springframework.util.ClassUtils;
import org.threeten.bp.LocalDate;
import org.threeten.bp.LocalTime;
import org.threeten.bp.temporal.ChronoField;
import com.datastax.driver.core.DataType.Name;
/**
* Helper class to register {@link Converter} implementations for the ThreeTen Backport project in case it's present on
* the classpath.
*
* @author Mark Paluch
* @see Threeten Backport
* @since 1.5
*/
public abstract class CassandraThreeTenBackPortConverters {
private static final boolean THREE_TEN_BACK_PORT_IS_PRESENT = ClassUtils.isPresent("org.threeten.bp.LocalDateTime",
ThreeTenBackPortConverters.class.getClassLoader());
private CassandraThreeTenBackPortConverters() {}
/**
* Returns the converters to be registered. Will only return converters in case ThreeTen Backport is on the class
* path.
*
* @return a {@link Collection} of ThreeTen Backport {@link Converter Converters} to register.
* @see org.springframework.core.convert.converter.Converter
* @see java.util.Collection
* @see org.joda.time
*/
public static Collection> getConvertersToRegister() {
if (!THREE_TEN_BACK_PORT_IS_PRESENT) {
return Collections.emptySet();
}
List> converters = new ArrayList<>();
converters.add(CassandraLocalDateToLocalDateConverter.INSTANCE);
converters.add(LocalDateToCassandraLocalDateConverter.INSTANCE);
converters.add(MillisOfDayToLocalTimeConverter.INSTANCE);
converters.add(LocalTimeToMillisOfDayConverter.INSTANCE);
return converters;
}
/**
* Simple singleton to convert {@link com.datastax.driver.core.LocalDate}s to their {@link LocalDate} representation.
*
* @author Mark Paluch
*/
public enum CassandraLocalDateToLocalDateConverter
implements Converter {
INSTANCE;
@Override
public LocalDate convert(com.datastax.driver.core.LocalDate source) {
return LocalDate.of(source.getYear(), source.getMonth(), source.getDay());
}
}
/**
* Simple singleton to convert {@link LocalDate}s to their {@link com.datastax.driver.core.LocalDate} representation.
*
* @author Mark Paluch
*/
public enum LocalDateToCassandraLocalDateConverter
implements Converter {
INSTANCE;
@Override
public com.datastax.driver.core.LocalDate convert(LocalDate source) {
return com.datastax.driver.core.LocalDate.fromYearMonthDay(source.getYear(), source.getMonthValue(),
source.getDayOfMonth());
}
}
/**
* 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(TimeUnit.MILLISECONDS.toNanos(source));
}
}
/**
* Simple singleton to convert {@link LocalTime}s to their {@link Long} representation.
*
* @author Mark Paluch
* @since 2.1
*/
@WritingConverter
@CassandraType(type = Name.TIME)
public enum LocalTimeToMillisOfDayConverter implements Converter {
INSTANCE;
@Override
public Long convert(LocalTime source) {
return source.getLong(ChronoField.MILLI_OF_DAY);
}
}
}