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using System;
using System.Collections.Generic;
using System.Text;
using CategoryTheory;
namespace MathGraph
{
/// <summary>
/// Edge of digraph
/// </summary>
public class DigraphEdge : IAssociatedObject, IRemovableObject
{
/// <summary>
/// Linked object
/// </summary>
protected object obj;
/// <summary>
/// Edge source
/// </summary>
protected DigraphVertex source;
/// <summary>
/// Edge target
/// </summary>
protected DigraphVertex target;
/// <summary>
/// The associated object
/// </summary>
public object Object
{
get
{
return obj;
}
set
{
obj = value;
}
}
/// <summary>
/// Constructor
/// </summary>
public DigraphEdge()
{
}
/// <summary>
/// Edge source
/// </summary>
public DigraphVertex Source
{
set
{
if (source != null)
{
throw new Exception("Source is already defined");
}
if (target != null)
{
if (value.Parent != target.Parent)
{
throw new Exception("Different parents of source and target");
}
}
source = value;
source.AddOutcoming(this);
}
get
{
return source;
}
}
/// <summary>
/// Edge target
/// </summary>
public DigraphVertex Target
{
set
{
if (target != null)
{
throw new Exception("Target is already defined");
}
if (source != null)
{
if (value.Parent != source.Parent)
{
throw new Exception("Different parents of source and target");
}
}
target = value;
target.AddIncoming(this);
}
get
{
return target;
}
}
/// <summary>
/// Removes itself
/// </summary>
public void RemoveObject()
{
source.RemoveOutcoming(this);
target.RemoveIncoming(this);
}
/// <summary>
/// Associated category object
/// </summary>
public ICategoryObject CategoryObject
{
get
{
if (obj == null)
{
return null;
}
if (obj is ICategoryObject)
{
return obj as ICategoryObject;
}
if (obj is IAssociatedObject)
{
IAssociatedObject ao = obj as IAssociatedObject;
object o = ao.Object;
if (o != null)
{
if (o is ICategoryObject)
{
return o as ICategoryObject;
}
}
}
return null;
}
}
}
}
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Ph. D. Petr Ivankov worked as scientific researcher at Russian Mission Control Centre since 1978 up to 2000. Now he is engaged by Aviation training simulators http://dinamika-avia.com/ . His additional interests are:
1) Noncommutative geometry
http://front.math.ucdavis.edu/author/P.Ivankov
2) Literary work (Russian only)
http://zhurnal.lib.ru/editors/3/3d_m/
3) Scientific articles
http://arxiv.org/find/all/1/au:+Ivankov_Petr/0/1/0/all/0/1
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