001/*
002 *  Copyright (c) 2022-2025, Mybatis-Flex (fuhai999@gmail.com).
003 *  <p>
004 *  Licensed under the Apache License, Version 2.0 (the "License");
005 *  you may not use this file except in compliance with the License.
006 *  You may obtain a copy of the License at
007 *  <p>
008 *  http://www.apache.org/licenses/LICENSE-2.0
009 *  <p>
010 *  Unless required by applicable law or agreed to in writing, software
011 *  distributed under the License is distributed on an "AS IS" BASIS,
012 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 *  See the License for the specific language governing permissions and
014 *  limitations under the License.
015 */
016package com.mybatisflex.core.handler;
017
018import com.mybatisflex.core.util.StringUtil;
019import org.apache.ibatis.type.BaseTypeHandler;
020import org.apache.ibatis.type.JdbcType;
021
022import java.sql.CallableStatement;
023import java.sql.PreparedStatement;
024import java.sql.ResultSet;
025import java.sql.SQLException;
026
027public abstract class BaseJsonTypeHandler<T> extends BaseTypeHandler<T> {
028
029    @Override
030    public void setNonNullParameter(PreparedStatement ps, int i, T parameter, JdbcType jdbcType) throws SQLException {
031        ps.setString(i, toJson(parameter));
032    }
033
034    @Override
035    public T getNullableResult(ResultSet rs, String columnName) throws SQLException {
036        final String json = rs.getString(columnName);
037        return StringUtil.isBlank(json) ? null : parseJson(json);
038    }
039
040    @Override
041    public T getNullableResult(ResultSet rs, int columnIndex) throws SQLException {
042        final String json = rs.getString(columnIndex);
043        return StringUtil.isBlank(json) ? null : parseJson(json);
044    }
045
046    @Override
047    public T getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {
048        final String json = cs.getString(columnIndex);
049        return StringUtil.isBlank(json) ? null : parseJson(json);
050    }
051
052    protected abstract T parseJson(String json);
053
054    protected abstract String toJson(T object);
055
056}