CODEWITHSUNDEEP
jgrapht
Eddie Martinez
Eddie Martinez

Reputation: 13910

DefaultEdge returning null for source and target for jgrapht

I am iterating over a set of edges returned from a jgrapht directed simple graph.

 Set<DefaultEdge> edges = graph.edgeSet();

    for (DefaultEdge edge : edges) {

       System.out.println(edge.getSource());
       System.out.println(edge.getTarget());

}

the edgeSet method returns the correct amount of edges, but the source and target are always null.

Upvotes: 1

Views: 516

Answers (1)

Eddie Martinez
Eddie Martinez

Reputation: 13910

When I instantiated my graph and passed it an edge class:

DirectedGraph graph = new SimpleDirectedGraph(DefaultEdge.class);

Netbeans gave me the option for what DefaultEdge.class file to import, I chose the wrong one. I used the org.jgraph library instead of the org.jgrapht.

If you are using the DefaultEdge class make sure you are using the one from jgrapht.

import org.jgrapht.graph.DefaultEdge;

otherwise there will be no compiler error, and everything will seem to work properly until there is an attempt to retrieve the edge data.

Upvotes: 3

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