package org.cristalise.gui.lifecycle.desc;
import org.cristalise.kernel.graph.model.DirectedEdge;
import org.cristalise.kernel.graph.model.EdgeFactory;
import org.cristalise.kernel.graph.model.GraphModelManager;
import org.cristalise.kernel.graph.model.TypeNameAndConstructionInfo;
import org.cristalise.kernel.graph.model.Vertex;
import org.cristalise.kernel.lifecycle.NextDef;
import org.cristalise.kernel.lifecycle.WfVertexDef;
public class WfEdgeDefFactory implements EdgeFactory
{
	@Override
	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 static 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);
	}
}