DBTestRunner.java

/*
 * Copyright 2014-2016 CyberVision, Inc.
 *
 * 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.kaaproject.kaa.server.common.dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.text.MessageFormat;
import java.util.HashSet;
import java.util.Set;

import javax.sql.DataSource;

public abstract class DBTestRunner {

  protected static final String FORMATER = "{0}";

  public void truncateTables(DataSource dataSource) throws SQLException {
    Set<String> tableNames = getTableNames(dataSource);
    truncateTables(tableNames, dataSource);
  }

  private Set<String> getTableNames(DataSource dataSource) throws SQLException {
    Set<String> tableNames = new HashSet<>();
    try (Connection connection = dataSource.getConnection();
         PreparedStatement preparedStatement = prepareStatement(connection);
         ResultSet resultSet = preparedStatement.executeQuery()) {
      while (resultSet.next()) {
        tableNames.add(resultSet.getString(1));
      }
    }
    return tableNames;
  }

  protected void truncateTables(Set<String> tableNames, DataSource dataSource) throws SQLException {
    if (tableNames == null || tableNames.isEmpty()) {
      return;
    }
    try (Connection connection = dataSource.getConnection(); Statement statement = connection.createStatement()) {
      for (String tableName : tableNames) {
        statement.addBatch(MessageFormat.format(getTrancateSql(), tableName));
      }
      statement.executeBatch();
    }
  }

  protected abstract PreparedStatement prepareStatement(Connection connection) throws SQLException;

  protected abstract String getTrancateSql();

}