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/*
 * SonarQube
 * Copyright (C) 2009-2016 SonarSource SA
 * mailto:contact AT sonarsource DOT com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package org.sonar.db.charset;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import org.sonar.db.DatabaseUtils;

public class SqlExecutor {

  public  List executeSelect(Connection connection, String sql, RowConverter rowConverter) throws SQLException {
    PreparedStatement stmt = null;
    ResultSet rs = null;
    try {
      stmt = connection.prepareStatement(sql);
      rs = stmt.executeQuery();
      List result = new ArrayList<>();
      while (rs.next()) {
        result.add(rowConverter.convert(rs));
      }
      return result;

    } finally {
      DatabaseUtils.closeQuietly(rs);
      DatabaseUtils.closeQuietly(stmt);
    }
  }

  public void executeUpdate(Connection connection, String sql) throws SQLException {
    PreparedStatement stmt = null;
    try {
      stmt = connection.prepareStatement(sql);
      stmt.executeUpdate();
    } finally {
      DatabaseUtils.closeQuietly(stmt);
    }
  }

  public interface RowConverter {
    T convert(ResultSet rs) throws SQLException;
  }

  public static class StringsConverter implements RowConverter {
    private final int nbColumns;

    public StringsConverter(int nbColumns) {
      this.nbColumns = nbColumns;
    }

    @Override
    public String[] convert(ResultSet rs) throws SQLException {
      String[] row = new String[nbColumns];
      for (int i = 0; i < nbColumns; i++) {
        row[i] = DatabaseUtils.getString(rs, i + 1);
      }
      return row;
    }
  }
}