/**
* Adds to the underlying JGraphT graph an edge that corresponds to the specified JGraph edge. If
* the specified JGraph edge is a dangling edge, it is NOT added to the underlying JGraphT graph.
*
* <p>This method is to be called only for edges that have already been added to the JGraph graph.
*
* @param jEdge the JGraph edge that has been added.
*/
void handleJGraphInsertedEdge(org.jgraph.graph.Edge jEdge) {
if (isDangling(jEdge)) {
// JGraphT forbid dangling edges so we cannot add the edge yet. If
// later the edge becomes connected, we will add it.
} else {
// FIXME hb 28-nov-05: waiting for jgraph to go generic
Object jSource = getSourceVertex(this, jEdge);
Object jTarget = getTargetVertex(this, jEdge);
V jtSource = cellToVertex.get(jSource);
V jtTarget = cellToVertex.get(jTarget);
E jtEdge = jtGraph.addEdge(jtSource, jtTarget);
if (jtEdge != null) {
cellToEdge.put(jEdge, jtEdge);
edgeToCell.put(jtEdge, jEdge);
} else {
// Adding failed because user is using a JGraphT graph the
// forbids parallel edges.
// For consistency, we remove the edge from the JGraph too.
internalRemoveCell(jEdge);
System.err.println(
"Warning: an edge was deleted because the underlying "
+ "JGraphT graph refused to create it. "
+ "This situation can happen when a constraint of the "
+ "underlying graph is violated, e.g., an attempt to add "
+ "a parallel edge or a self-loop to a graph that forbids "
+ "them. To avoid this message, make sure to use a "
+ "suitable underlying JGraphT graph.");
}
}
}
