source: trunk/sources/HeuristicLab.Data/DoubleMatrixData.cs @ 874

#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2008 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;
using System.Collections.Generic;
using System.Globalization;
using System.Text;
using System.Xml;
using HeuristicLab.Core;

namespace HeuristicLab.Data {
  /// <summary>
  /// A two-dimensional matrix consisting of double values.
  /// </summary>
  public class DoubleMatrixData : ArrayDataBase {
    /// <summary>
    /// Gets or sets the double elements of the matrix.
    /// </summary>
    /// <remarks>Uses property <see cref="ArrayDataBase.Data"/> of base 
    /// class <see cref="ArrayDataBase"/>. No own data storage present.</remarks>
    public new double[,] Data {
      get { return (double[,])base.Data; }
      set { base.Data = value; }
    }

    /// <summary>
    /// Initializes a new instance of the <see cref="DoubleMatrixData"/> class.
    /// </summary>
    public DoubleMatrixData() {
      Data = new double[1, 1];
    }
    /// <summary>
    /// Initializes a new instance of the <see cref="DoubleMatrixData"/> class.
    /// <note type="caution"> No CopyConstructor! <paramref name="data"/> is not copied!</note>
    /// </summary>
    /// <param name="data">The two-dimensional double matrix the instance should represent.</param>
    public DoubleMatrixData(double[,] data) {
      Data = data;
    }

    /// <summary>
    /// Creates a new instance of the <see cref="DoubleMatrixDataView"/> class.
    /// </summary>
    /// <returns>The created instance as <see cref="DoubleMatrixDataView"/>.</returns>
    public override IView CreateView() {
      return new DoubleMatrixDataView(this);
    }

    /// <summary>
    /// Saves the current instance as <see cref="XmlNode"/> in the specified <paramref name="document"/>.
    /// </summary>
    /// <remarks>The dimensions of the matrix are saved as attributes (<c>Dimension1</c>,<c>Dimension2</c>), 
    /// formatted according to the local culture info and its number format.<br/>
    /// The elements of the matrix are saved as string in the node's inner text, 
    /// each element separated by a semicolon, all line by line, formatted according to the 
    /// local number format.</remarks>
    /// <param name="name">The (tag)name of the <see cref="XmlNode"/>.</param>
    /// <param name="document">The <see cref="XmlDocument"/> where the data is saved.</param>
    /// <param name="persistedObjects">A dictionary of all already persisted objects. (Needed to avoid cycles.)</param>
    /// <returns>The saved <see cref="XmlNode"/>.</returns>
    public override XmlNode GetXmlNode(string name, XmlDocument document, IDictionary<Guid,IStorable> persistedObjects) {
      XmlNode node = base.GetXmlNode(name, document, persistedObjects);
      XmlAttribute dim1 = document.CreateAttribute("Dimension1");
      dim1.Value = Data.GetLength(0).ToString(CultureInfo.InvariantCulture.NumberFormat);
      node.Attributes.Append(dim1);
      XmlAttribute dim2 = document.CreateAttribute("Dimension2");
      dim2.Value = Data.GetLength(1).ToString(CultureInfo.InvariantCulture.NumberFormat);
      node.Attributes.Append(dim2);
      node.InnerText = ToString(CultureInfo.InvariantCulture.NumberFormat);
      return node;
    }
    /// <summary>
    /// Loads the persisted matrix from the specified <paramref name="node"/>.
    /// </summary>
    /// <remarks>The dimensions of the matrix must be saved as Attributes (<c>Dimension1</c>, <c>Dimension2</c>),
    /// formatted in the local number format. <br/>
    /// The elements of the matrix must be saved in the node's inner text as string, 
    /// each element separated by a semicolon, line by line, formatted according to the local 
    /// culture info and its number format (see <see cref="GetXmlNode"/>).</remarks>
    /// <exception cref="System.FormatException">Thrown when a saved element cannot be parsed as a double value.</exception>
    /// <param name="node">The <see cref="XmlNode"/> where the instance is saved.</param>
    /// <param name="restoredObjects">The dictionary of all already restored objects. (Needed to avoid cycles.)</param>
    public override void Populate(XmlNode node, IDictionary<Guid,IStorable> restoredObjects) {
      base.Populate(node, restoredObjects);
      int dim1 = int.Parse(node.Attributes["Dimension1"].Value, CultureInfo.InvariantCulture.NumberFormat);
      int dim2 = int.Parse(node.Attributes["Dimension2"].Value, CultureInfo.InvariantCulture.NumberFormat);
      string[] tokens = node.InnerText.Split(';');
      double[,] data = new double[dim1, dim2];
      for (int i = 0; i < dim1; i++) {
        for (int j = 0; j < dim2; j++) {
          if(double.TryParse(tokens[i * dim2 + j], NumberStyles.Float, CultureInfo.InvariantCulture.NumberFormat, out data[i, j])==false) {
            throw new FormatException("Can't parse " + tokens[i * dim2 + j] + " as double value.");
          }
        }
      }
      Data = data;
    }

    /// <summary>
    /// The string representation of the matrix.
    /// </summary>
    /// <returns>The elements of the matrix as a string, line by line, each element separated by a 
    /// semicolon and formatted according to local number format.</returns>
    public override string ToString() {
      return ToString(CultureInfo.CurrentCulture.NumberFormat);
    }
    
    /// <summary>
    /// The string representation of the matrix, considering a specified <paramref name="format"/>.
    /// </summary>
    /// <param name="format">The <see cref="NumberFormatInfo"/> the double values are formatted accordingly.</param>
    /// <returns>The elements of the matrix as a string, line by line, each element separated by a 
    /// semicolon and formatted according to the specified <paramref name="format"/>.</returns>
    private string ToString(NumberFormatInfo format) {
      StringBuilder builder = new StringBuilder();
      for (int i = 0; i < Data.GetLength(0); i++) {
        for (int j = 0; j < Data.GetLength(1); j++) {
          builder.Append(";");
          builder.Append(Data[i, j].ToString("r", format));
        }
      }
      if (builder.Length > 0) builder.Remove(0, 1);
      return builder.ToString();
    }
  }
}