EnumByNameMapperFactory.java example

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/*
 * 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.getErasedType;

import java.lang.reflect.Type;
import java.util.Optional;

import org.jdbi.v3.core.config.ConfigRegistry;

/**
 * Produces enum column mappers, which map enums from varchar columns using {@link Enum#valueOf(Class, String)}.
 */
public class EnumByNameMapperFactory implements ColumnMapperFactory {
    @SuppressWarnings({ "unchecked", "rawtypes" })
    @Override
    public Optional<ColumnMapper<?>> build(Type type, ConfigRegistry config) {
        Class<?> clazz = getErasedType(type);
        return clazz.isEnum()
                ? Optional.of(EnumMapper.byName((Class<? extends Enum>) clazz))
                : Optional.empty();
    }
}