public bool RemoveNode(IRelationNode node)
{
if (node == null)
{
throw new ArgumentNullException(nameof(node));
}
return(RemoveNode(node.Discriminant));
}
public IRelationVertex GetVertex(IRelationNode leftNode, IRelationNode rightNode)
{
if (leftNode == null)
{
throw new ArgumentNullException(nameof(leftNode));
}
if (rightNode == null)
{
throw new ArgumentNullException(nameof(rightNode));
}
return(leftNode.GetVertex(rightNode) ?? rightNode.GetVertex(leftNode));
}
public bool RemoveVertex(IRelationNode leftNode, IRelationNode rightNode)
{
if (leftNode == null)
{
throw new ArgumentNullException(nameof(leftNode));
}
if (rightNode == null)
{
throw new ArgumentNullException(nameof(rightNode));
}
return(leftNode.Vertices.Remove(rightNode.Discriminant) & rightNode.Vertices.Remove(leftNode.Discriminant));
}
public void AddVertex(IRelationNode leftNode, IRelationNode rightNode, ICardinality leftCardinality = null, ICardinality rightCardinality = null)
{
if (leftNode == null)
{
throw new ArgumentNullException(nameof(leftNode));
}
if (rightNode == null)
{
throw new ArgumentNullException(nameof(rightNode));
}
if (leftNode.Vertices.ContainsKey(rightNode.Discriminant) || rightNode.Vertices.ContainsKey(leftNode.Discriminant))
{
throw new ArgumentException(nameof(leftNode.Discriminant));
}
var vertex = new RelationVertex(leftNode, rightNode, leftCardinality, rightCardinality);
leftNode.Vertices.Add(rightNode.Discriminant, vertex);
rightNode.Vertices.Add(leftNode.Discriminant, vertex);
}
public RelationVertex(IRelationNode leftNode, IRelationNode rightNode, ICardinality leftCardinality = null, ICardinality rightCardinality = null)
{
if (leftNode == null)
{
throw new ArgumentNullException(nameof(leftNode));
}
if (rightNode == null)
{
throw new ArgumentNullException(nameof(rightNode));
}
if (leftNode == RightNode || leftNode.Discriminant == rightNode.Discriminant)
{
throw new ArgumentException("discriminants should be different");
}
LeftNode = leftNode;
RightNode = rightNode;
LeftCardinality = leftCardinality ?? new Cardinality();
RightCardinality = leftCardinality ?? new Cardinality();
}
public IRelationVertex GetVertex(IRelationNode oppositeNode)
{
return(GetVertex(oppositeNode.Discriminant));
}
