source: branches/HeuristicLab.Problems.GrammaticalOptimization/DynamicDataDisplay/DataSources/OneDimensional/CompositeDataSource.cs @ 13792

using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows;
using System.Collections;

namespace Microsoft.Research.DynamicDataDisplay.DataSources
{
  /// <summary>Data source that is a composer from several other data sources.</summary>
  public class CompositeDataSource : IPointDataSource {
    /// <summary>Initializes a new instance of the <see cref="CompositeDataSource"/> class</summary>
    public CompositeDataSource() { }

    /// <summary>
    /// Initializes a new instance of the <see cref="CompositeDataSource"/> class.
    /// </summary>
    /// <param name="dataSources">Data sources.</param>
    public CompositeDataSource(params IPointDataSource[] dataSources) {
      if (dataSources == null)
        throw new ArgumentNullException("dataSources");

      foreach (var dataSource in dataSources) {
        AddDataPart(dataSource);
      }
    }

    private readonly List<IPointDataSource> dataParts = new List<IPointDataSource>();

    public IEnumerable<IPointDataSource> DataParts {
      get { return dataParts; }
    }

    /// <summary>
    /// Adds data part.
    /// </summary>
    /// <param name="dataPart">The data part.</param>
    public void AddDataPart(IPointDataSource dataPart) {
      if (dataPart == null)
        throw new ArgumentNullException("dataPart");

      dataParts.Add(dataPart);
      dataPart.DataChanged += OnPartDataChanged;
    }

    private void OnPartDataChanged(object sender, EventArgs e) {
      RaiseDataChanged();
    }

    #region IPointSource Members

    public event EventHandler DataChanged;
    protected void RaiseDataChanged() {
      if (DataChanged != null) {
        DataChanged(this, EventArgs.Empty);
      }
    }

    public IPointEnumerator GetEnumerator(DependencyObject context) {
      return new CompositeEnumerator(this, context);
    }

    #endregion

    private sealed class CompositeEnumerator : IPointEnumerator {
      private readonly IEnumerable<IPointEnumerator> enumerators;

      public CompositeEnumerator(CompositeDataSource dataSource, DependencyObject context) {
        enumerators = dataSource.dataParts.Select(part => part.GetEnumerator(context)).ToList();
      }

      #region IChartPointEnumerator Members

      public bool MoveNext() {
        bool res = true;
        foreach (var enumerator in enumerators) {
          res &= enumerator.MoveNext();
        }
        return res;
      }

      public void ApplyMappings(DependencyObject glyph) {
        foreach (var enumerator in enumerators) {
          enumerator.ApplyMappings(glyph);
        }
      }

      public void GetCurrent(ref Point p) {
        foreach (var enumerator in enumerators) {
          enumerator.GetCurrent(ref p);
        }
      }

      public void Dispose() {
        foreach (var enumerator in enumerators) {
          enumerator.Dispose();
        }
      }

      #endregion
    }
  }
}