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/*
* Copyright (c) 2020, 2023 Oracle and/or its affiliates.
*
* 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 io.helidon.dbclient;
import java.sql.Timestamp;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.ZoneOffset;
import java.time.ZonedDateTime;
import java.util.Calendar;
import java.util.Collections;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.HashMap;
import java.util.Map;
import java.util.ServiceLoader;
import io.helidon.common.mapper.Mapper;
import io.helidon.common.mapper.spi.MapperProvider;
/**
* Java {@link ServiceLoader} service to get database types mappers.
*/
public class DbMapperProviderImpl implements MapperProvider {
/**
* Mappers index {@code [Class, Class] -> Mapper}.
*/
private static final Map, Map, Mapper>> MAPPERS = initMappers();
@SuppressWarnings("Java9CollectionFactory")
private static Map, Map, Mapper>> initMappers() {
// All mappers index
Map, Map, Mapper>> mappers = new HashMap<>(3);
// * Mappers for java.sql.Timestamp source
Map, Mapper> sqlTimestampMap = new HashMap<>(4);
// - Mapper for java.sql.Timestamp to java.util.Date
sqlTimestampMap.put(
Date.class,
source -> source);
// - Mapper for java.sql.Timestamp to java.time.LocalDateTime
sqlTimestampMap.put(
LocalDateTime.class,
(Timestamp source) -> source != null
? source.toLocalDateTime()
: null);
// - Mapper for java.sql.Timestamp to java.time.ZonedDateTime
sqlTimestampMap.put(
ZonedDateTime.class,
(Timestamp source) -> source != null
? ZonedDateTime.ofInstant(source.toInstant(), ZoneOffset.UTC)
: null);
// - Mapper for java.sql.Timestamp to java.util.Calendar
sqlTimestampMap.put(
Calendar.class,
DbMapperProviderImpl::sqlTimestampToGregorianCalendar);
// - Mapper for java.sql.Timestamp to java.util.GregorianCalendar
sqlTimestampMap.put(
GregorianCalendar.class,
DbMapperProviderImpl::sqlTimestampToGregorianCalendar);
mappers.put(
Timestamp.class,
Collections.unmodifiableMap(sqlTimestampMap));
// * Mappers for java.sql.Date source
// - Mapper for java.sql.Date to java.util.Date
mappers.put(
java.sql.Date.class,
Map.of(Date.class, source -> source,
// - Mapper for java.sql.Date to java.time.LocalDate
LocalDate.class, (java.sql.Date source) -> source != null
? source.toLocalDate()
: null));
// * Mappers for java.sql.Time source
Map, Mapper> sqlTimeMap = new HashMap<>(2);
// - Mapper for java.sql.Time to java.util.Date
sqlTimeMap.put(
Date.class,
source -> source);
// - Mapper for java.sql.Time to java.time.LocalTime
sqlTimeMap.put(
LocalTime.class,
(java.sql.Time source) -> source != null
? source.toLocalTime()
: null);
mappers.put(
java.sql.Time.class,
Collections.unmodifiableMap(sqlTimeMap));
return Collections.unmodifiableMap(mappers);
}
@Override
public ProviderResponse mapper(Class sourceClass, Class targetClass, String qualifier) {
Map, Mapper> targetMap = MAPPERS.get(sourceClass);
if (targetMap == null) {
return ProviderResponse.unsupported();
}
Mapper mapper = targetMap.get(targetClass);
return mapper == null ? ProviderResponse.unsupported() : new ProviderResponse(Support.SUPPORTED, mapper);
}
/**
* Maps {@link java.sql.Timestamp} to {@link java.util.Calendar} with zone set to UTC.
*/
private static GregorianCalendar sqlTimestampToGregorianCalendar(Timestamp source) {
return source != null
? GregorianCalendar.from(ZonedDateTime.ofInstant(source.toInstant(), ZoneOffset.UTC))
: null;
}
}
