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/*
 * Copyright 2014-2015 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.util.Arrays;
import java.util.Map;
import java.util.function.Function;
import java.util.stream.Collectors;

import br.com.objectos.db.mysql.Mysql;

/**
 * @author [email protected] (Marcio Endo)
 */
public class DatabaseFarm {

  private final Map databaseMap;

  private DatabaseFarm(Map databaseMap) {
    this.databaseMap = databaseMap;
  }

  public static DatabaseFarm get() {
    return of(Mysql.dialect());
  }

  private static DatabaseFarm of(Dialect... dialectArray) {
    Map databaseMap = Arrays.asList(dialectArray).stream()
        .map(Dialect::connect)
        .collect(Collectors.toMap(Database::dialect, Function.identity()));
    return new DatabaseFarm(databaseMap);
  }

  public final Transaction startTransaction(Dialect dialect) throws SqlException {
    checkDialect(dialect);
    return databaseMap.get(dialect).startTransaction();
  }

  private void checkDialect(Dialect dialect) {
    if (!databaseMap.containsKey(dialect)) {
      throw new IllegalArgumentException("Dialect '" + dialect + "' was not configured in this farm.");
    }
  }

}