package com.c2kernel.lifecycle.gui.model;
import com.c2kernel.graph.model.DirectedEdge;
import com.c2kernel.graph.model.EdgeFactory;
import com.c2kernel.graph.model.GraphModelManager;
import com.c2kernel.graph.model.TypeNameAndConstructionInfo;
import com.c2kernel.graph.model.Vertex;
import com.c2kernel.lifecycle.NextDef;
import com.c2kernel.lifecycle.WfVertexDef;
public class WfEdgeDefFactory implements EdgeFactory
{
	public void create(
		GraphModelManager graphModelManager,
		Vertex origin,
		Vertex terminus,
		TypeNameAndConstructionInfo typeNameAndConstructionInfo)
	{
		if (validCreation(graphModelManager, origin, terminus))
				{
					NextDef nextDef = new NextDef((WfVertexDef) origin, (WfVertexDef) terminus);
					graphModelManager.getModel().addEdgeAndCreateId(nextDef, origin, terminus);
				}
	}
	private boolean validCreation(GraphModelManager graphModelManager, Vertex origin, Vertex terminus)
	{
		DirectedEdge[] connectingEdgesAToB = graphModelManager.getModel().getConnectingEdges(origin.getID(), terminus.getID());
		DirectedEdge[] connectingEdgesBToA = graphModelManager.getModel().getConnectingEdges(terminus.getID(), origin.getID());
		return (origin != terminus) && (connectingEdgesAToB.length == 0) && (connectingEdgesBToA.length == 0);
	}
}