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/*
 * Copyright 2014 Objectos, Fábrica de Software LTDA.
 *
 * 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 br.com.objectos.db;

import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.SQLException;

import javax.sql.DataSource;

import br.com.objectos.pojo.Pojo;

/**
 * @author [email protected] (Marcio Endo)
 */
@Pojo
public abstract class Database {

  abstract DatabaseConfig config();
  abstract DataSource dataSource();

  Database() {
  }

  static DatabaseBuilder builder() {
    return new DatabaseBuilderPojo();
  }

  public final Dialect dialect() {
    return config().dialect();
  }

  public final Metadata metadata() throws SqlException {
    try {
      DatabaseMetaData db = dataSource().getConnection().getMetaData();
      return config().dialect().metadata(this, db);
    } catch (SQLException e) {
      throw SqlException.wrap(e);
    }
  }

  public final Transaction startTransaction() throws SqlException {
    try {
      Connection connection = dataSource().getConnection();
      connection.setAutoCommit(false);
      return Transaction.builder()
          .dialect(config().dialect())
          .connection(connection)
          .build();
    } catch (SQLException e) {
      throw SqlException.wrap(e);
    }
  }

}