#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2013 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
 *
 * This file is part of HeuristicLab.
 *
 * HeuristicLab is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * HeuristicLab 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
 */
#endregion

using System.Collections.Generic;
using HeuristicLab.DataImporter.Data.CommandBase;
using HeuristicLab.DataImporter.Data.Model;
using HeuristicLab.DataImporter.DbExplorer.Interfaces;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;

namespace HeuristicLab.DataImporter.DataProcessor.Command {
  [StorableClass]
  public class LoadColumnGroupsFromDBCommand : DatabaseCommandBase {
    [Storable]
    private List<DbTable> tables;

    private List<ColumnGroup> newColumnGroups;

    [StorableConstructor]
    protected LoadColumnGroupsFromDBCommand(bool deserializing)
      : base(deserializing) {
      this.newColumnGroups = new List<ColumnGroup>();
    }

    public LoadColumnGroupsFromDBCommand(DataSet dataSet, IDbExplorer dbExplorer, IEnumerable<DbTable> tables)
      : base(dataSet, dbExplorer) {
      this.tables = new List<DbTable>(tables);
      this.newColumnGroups = new List<ColumnGroup>();
    }

    public override string Description {
      get { return "Load ColumnGroups from database"; }
    }

    public override void Execute() {
      base.Execute();
      if (DbExplorer == null || !DbExplorer.IsConnected)
        throw new CommandExecutionException("Could not load data because no connection to the database exists", this);
      ColumnGroup columnGroup;
      foreach (DbTable table in tables) {
        columnGroup = DbExplorer.CreateColumnGroup(table);
        this.DataSet.AddColumnGroup(columnGroup);
        newColumnGroups.Add(columnGroup);
      }
      this.DataSet.FireChanged();
    }

    public override void UndoExecute() {
      base.UndoExecute();
      foreach (ColumnGroup columnGroup in newColumnGroups)
        this.DataSet.RemoveColumnGroup(columnGroup);
      newColumnGroups.Clear();
      this.DataSet.FireChanged();
    }
  }
}