ch.digitalfondue.npjt.mapper.EnumMapper.java Source code

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Here is the source code for ch.digitalfondue.npjt.mapper.EnumMapper.java

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/**
 * Copyright (C) 2015 digitalfondue (info@digitalfondue.ch)
 *
 * 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 ch.digitalfondue.npjt.mapper;

import java.sql.ResultSet;
import java.sql.SQLException;

import org.springframework.jdbc.core.RowMapper;
import org.springframework.jdbc.core.namedparam.MapSqlParameterSource;

import ch.digitalfondue.npjt.mapper.ColumnMapperFactory;
import ch.digitalfondue.npjt.mapper.ParameterConverter;

public class EnumMapper extends ColumnMapper {

    private static final int ORDER = Integer.MAX_VALUE - 1;

    public EnumMapper(String name, Class<?> paramType) {
        super(name, paramType);
    }

    @Override
    public Object getObject(ResultSet rs) throws SQLException {
        String res = rs.getString(name);
        return toEnum(res, paramType);
    }

    @SuppressWarnings({ "unchecked", "rawtypes" })
    private static Object toEnum(String res, Class<?> paramType) {
        Class<? extends Enum> enumType = (Class<? extends Enum<?>>) paramType;
        return res == null ? null : Enum.valueOf(enumType, res.trim());
    }

    public static class Converter implements ParameterConverter {

        @Override
        public boolean accept(Class<?> parameterType) {
            return parameterType.isEnum();
        }

        @Override
        public void processParameter(String parameterName, Object arg, Class<?> parameterType,
                MapSqlParameterSource ps) {
            ps.addValue(parameterName, ((Enum<?>) arg).name());
        }

        @Override
        public int order() {
            return ORDER;
        }

    }

    public static class Factory implements ColumnMapperFactory {

        @Override
        public ColumnMapper build(String name, Class<?> paramType) {
            return new EnumMapper(name, paramType);
        }

        @Override
        public int order() {
            return ORDER;
        }

        @Override
        public boolean accept(Class<?> paramType) {
            return paramType.isEnum();
        }

        @Override
        public RowMapper<Object> getSingleColumnRowMapper(final Class<Object> clazz) {
            return new RowMapper<Object>() {
                @Override
                public Object mapRow(ResultSet rs, int rowNum) throws SQLException {
                    return toEnum(rs.getString(1), clazz);
                }
            };
        }
    }
}