/* * 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.util.Optional; import org.jdbi.v3.core.config.ConfigRegistry; /** * Factory interface used to produce column mappers. */ @FunctionalInterface public interface ColumnMapperFactory { /** * Supplies a column mapper which will map columns to type if the factory supports it; empty otherwise. * * @param type the target type to map to * @param config the config registry, for composition * @return a column mapper for the given type if this factory supports it, or <code>Optional.empty()</code> otherwise. * @see ColumnMappers for composition */ Optional<ColumnMapper<?>> build(Type type, ConfigRegistry config); /** * Create a ColumnMapperFactory from a given {@link ColumnMapper} that * matches a single Type exactly. * * @param type the type to match with equals. * @param mapper the mapper to return * @return the factory */ static ColumnMapperFactory of(Type type, ColumnMapper<?> mapper) { return (t, c) -> t.equals(type) ? Optional.of(mapper) : Optional.empty(); } }