using Netron.Diagramming.Core.Analysis;
namespace Netron.Diagramming.Core {
  public partial class Connection : IEdge {
    #region Fields
    private bool mIsDirected = false;

    #endregion


    bool IEdge.IsDirected {
      get { return mIsDirected; }
      set { mIsDirected = value; }
    }

    INode IEdge.SourceNode {
      get {
        if (From.AttachedTo == null)
          return null;
        else
          return From.AttachedTo.Parent as INode;
      }
    }

    INode IEdge.TargetNode {
      get {
        if (To.AttachedTo == null)
          return null;
        else
          return To.AttachedTo.Parent as INode;
      }
    }

    INode IEdge.AdjacentNode(INode node) {
      if (From.AttachedTo != null && (node as IShape) == From.AttachedTo.Parent) {
        if (To.AttachedTo == null)
          return null;
        else
          return To.AttachedTo.Parent as INode;
      } else if (To.AttachedTo.Parent != null && (node as IShape) == To.AttachedTo.Parent) {
        if (From.AttachedTo == null)
          return null;
        else
          return From.AttachedTo.Parent as INode;
      } else
        throw new InconsistencyException("The given node is not part of the edge.");

    }
  }
}