[jgrapht-users] Problem with ListenableDirectedGraph with custom edge class

[Andreea S. <and...@ya...>]

Hi,

I have a problem when using a ListenableDirectedGraph with a custom edge, as shown below:

ListenableDirectedGraph<CypherBasicNode, CypherBasicEdge> dirGraph = 
new ListenableDirectedGraph<CypherBasicNode, CypherBasicEdge>(CypherBasicEdge.class);

Everything is displayed fine in the Applet, but when I issue a dirGraph.edgeSet() the set is not correct. The first value in the set it is correct, while all the rest are null. I was researching and saw that when an addEdge is made, the empty constructor of the custom edge class is called (which I don't understand why, because I create the edge beforehand and I add it using:

CypherBasicEdge edge = new CypherBasicEdge(relId);

dirGraph.addEdge(firstNode, secondNode, edge);


 ). If I delete the empty constructor I get a "java.lang.RuntimeException: Edge factory failed" exception, because in add newInstance() is called (which is weird considering that an edge Object is given as an argument to addEdge ). 
 
If I run this code:

CypherBasicEdge edge = new CypherBasicEdge(relId);

dirGraph.addEdge(firstNode, secondNode, edge);

System.out.println("first edge: " + edge);

System.out.println("second edge: " + dirGraph.getEdge(firstNode, secondNode));


I get the following output:

first edge: r2 {}
second edge: null {}
 
Which to me seems very unlikely to be correct. Meanwhile, the visual representation is correct. Also, if I change the graph from ListenableDirectedGraph to DefaultDirectedGraph, everything works correctly. 

I am not sure whether I have not understood how I should use the classes or there is some kind of bug. I would appreciated any help.

Best regards,
Andreea Sandu