/*
 *    Copyright 2016-2020 the original author or authors.
 *
 *    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 examples.array;

import org.apache.ibatis.type.BaseTypeHandler;
import org.apache.ibatis.type.JdbcType;

import java.sql.Array;
import java.sql.CallableStatement;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

public class StringArrayTypeHandler extends BaseTypeHandler<String[]> {
    @Override
    public void setNonNullParameter(PreparedStatement ps, int i, String[] parameter, JdbcType jdbcType) throws SQLException {
        Array array = ps.getConnection().createArrayOf("VARCHAR", parameter);
        ps.setArray(i, array);
        array.free();
    }

    @Override
    public String[] getNullableResult(ResultSet rs, String columnName) throws SQLException {
        Array array = rs.getArray(columnName);
        return extractArray(array);
    }

    @Override
    public String[] getNullableResult(ResultSet rs, int columnIndex) throws SQLException {
        Array array = rs.getArray(columnIndex);
        return extractArray(array);
    }

    @Override
    public String[] getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {
        Array array = cs.getArray(columnIndex);
        return extractArray(array);
    }

    private String[] extractArray(Array array) throws SQLException {
        Object[] objArray = (Object[]) array.getArray();
        array.free();

        List<String> stringList = Arrays.stream(objArray)
                .map(Object::toString)
                .collect(Collectors.toList());

        String[] stringArray = new String[stringList.size()];
        return stringList.toArray(stringArray);
    }
}
