/* * 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 static org.jdbi.v3.core.generic.GenericTypes.findGenericParameter; import java.lang.reflect.Type; import java.util.Optional; import org.jdbi.v3.core.config.ConfigRegistry; /** * A generic RowMapperFactory that reflectively inspects a * {@code RowMapper<T>} and maps only to columns of type * {@code T}. The type parameter T must be accessible * via reflection or an {@link UnsupportedOperationException} * will be thrown. */ class InferredRowMapperFactory implements RowMapperFactory { private final Type maps; private final RowMapper<?> mapper; InferredRowMapperFactory(RowMapper<?> mapper) { this.maps = findGenericParameter(mapper.getClass(), RowMapper.class) .orElseThrow(() -> new UnsupportedOperationException("Must use a concretely typed RowMapper here")); this.mapper = mapper; } @Override public Optional<RowMapper<?>> build(Type type, ConfigRegistry config) { return maps.equals(type) ? Optional.of(mapper) : Optional.empty(); } }