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source: trunk/sources/HeuristicLab.Problems.Instances.DataAnalysis/3.3/DataAnalysisInstanceProvider.cs @ 14343

Last change on this file since 14343 was 14343, checked in by mkommend, 7 years ago

#2688: Forwarded selected encoding from the import dialog to the table file parser.

File size: 4.3 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2016 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
4 *
5 * This file is part of HeuristicLab.
6 *
7 * HeuristicLab is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * HeuristicLab is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
19 */
20#endregion
21
22using System;
23using System.Collections;
24using System.Collections.Generic;
25using System.ComponentModel;
26using System.Globalization;
27using System.IO;
28using System.Linq;
29using System.Text;
30using HeuristicLab.Problems.DataAnalysis;
31using HeuristicLab.Random;
32
33namespace HeuristicLab.Problems.Instances.DataAnalysis {
34  public abstract class DataAnalysisInstanceProvider<TData, ImportType> : ProblemInstanceProvider<TData>
35    where TData : class, IDataAnalysisProblemData
36    where ImportType : DataAnalysisImportType {
37
38    public event ProgressChangedEventHandler ProgressChanged;
39
40    public TData ImportData(string path, ImportType type, DataAnalysisCSVFormat csvFormat) {
41      TableFileParser csvFileParser = new TableFileParser();
42      csvFileParser.Encoding = csvFormat.Encoding;
43      long fileSize = new FileInfo(path).Length;
44      csvFileParser.ProgressChanged += (sender, e) => {
45        OnProgressChanged(e / (double)fileSize);
46      };
47      csvFileParser.Parse(path, csvFormat.NumberFormatInfo, csvFormat.DateTimeFormatInfo, csvFormat.Separator, csvFormat.VariableNamesAvailable);
48      return ImportData(path, type, csvFileParser);
49    }
50
51    protected virtual void OnProgressChanged(double d) {
52      var handler = ProgressChanged;
53      if (handler != null)
54        handler(this, new ProgressChangedEventArgs((int)(100 * d), null));
55    }
56
57    protected virtual TData ImportData(string path, ImportType type, TableFileParser csvFileParser) {
58      throw new NotSupportedException();
59    }
60
61    protected List<IList> Shuffle(List<IList> values) {
62      int count = values.First().Count;
63      int[] indices = Enumerable.Range(0, count).Shuffle(new FastRandom()).ToArray();
64      List<IList> shuffled = new List<IList>(values.Count);
65      for (int col = 0; col < values.Count; col++) {
66
67        if (values[col] is List<double>)
68          shuffled.Add(new List<double>());
69        else if (values[col] is List<DateTime>)
70          shuffled.Add(new List<DateTime>());
71        else if (values[col] is List<string>)
72          shuffled.Add(new List<string>());
73        else
74          throw new InvalidOperationException();
75
76        for (int i = 0; i < count; i++) {
77          shuffled[col].Add(values[col][indices[i]]);
78        }
79      }
80      return shuffled;
81    }
82
83    public override bool CanExportData {
84      get { return true; }
85    }
86    public override void ExportData(TData instance, string path) {
87      var strBuilder = new StringBuilder();
88      var colSep = CultureInfo.CurrentCulture.TextInfo.ListSeparator;
89      foreach (var variable in instance.Dataset.VariableNames) {
90        strBuilder.Append(variable.Replace(colSep, String.Empty) + colSep);
91      }
92      strBuilder.Remove(strBuilder.Length - colSep.Length, colSep.Length);
93      strBuilder.AppendLine();
94
95      var dataset = instance.Dataset;
96
97      for (int i = 0; i < dataset.Rows; i++) {
98        for (int j = 0; j < dataset.Columns; j++) {
99          if (j > 0) strBuilder.Append(colSep);
100          strBuilder.Append(dataset.GetValue(i, j));
101        }
102        strBuilder.AppendLine();
103      }
104      using (var fileStream = new FileStream(path, FileMode.Create)) {
105        Encoding encoding = Encoding.GetEncoding(Encoding.Default.CodePage,
106          new EncoderReplacementFallback("*"),
107          new DecoderReplacementFallback("*"));
108        using (var writer = new StreamWriter(fileStream, encoding)) {
109          writer.Write(strBuilder);
110        }
111      }
112    }
113  }
114}
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