/*
* 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 org.jdbi.v3.core.mapper;
import java.lang.reflect.Type;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Optional;
import org.jdbi.v3.core.generic.GenericTypes;
import org.jdbi.v3.core.statement.StatementContext;
class OptionalMapper<T> implements ColumnMapper<Optional<T>> {
private final Type type;
private OptionalMapper(Type type) {
this.type = type;
}
public static ColumnMapper<?> of(Type type) {
return new OptionalMapper<>(type);
}
@SuppressWarnings("unchecked")
@Override
public Optional<T> map(ResultSet r, int columnNumber, StatementContext ctx) throws SQLException {
final ColumnMapper<?> mapper = ctx.findColumnMapperFor(
GenericTypes.findGenericParameter(type, Optional.class)
.orElseThrow(() -> new NoSuchMapperException("No mapper for raw Optional type")))
.orElseThrow(() -> new NoSuchMapperException("No mapper for type " + type + " nested in Optional"));
return (Optional<T>) Optional.ofNullable(mapper.map(r, columnNumber, ctx));
}
}