public static <NodeLabel, EdgeLabel> String toString(
Graph<NodeLabel, EdgeLabel> graph, Edge edge) {
return String.format(
"(%s,%s)",
graph.getNodeLabel(edge.getSourceNodeID()).toString(),
graph.getNodeLabel(edge.getDestNodeID()).toString());
}
/**
* compute the transitive closure of the input graph
*
* @param <NodeLabel>
* @param <EdgeLabel>
* @param original
* @return
*/
public static <NodeLabel, EdgeLabel> Graph<NodeLabel, EdgeLabel> transitiveClosure(
Graph<NodeLabel, EdgeLabel> input) {
Graph<NodeLabel, EdgeLabel> graph = AdjacencyList.copy(input);
int numChange = 0;
do {
numChange = 0;
for (NodeLabel from : graph.getNodeLabelSet()) {
for (NodeLabel to : graph.getNodeLabelSet()) {
if (graph.hasEdge(from, to)) continue;
int destNodeID = graph.getNodeID(to);
for (Edge startPoint : graph.getOutEdgeSet(from)) {
int intermediateNodeID = startPoint.getDestNodeID();
if (graph.hasEdge(new Edge(intermediateNodeID, destNodeID))) {
graph.addEdge(from, to);
++numChange;
break;
}
}
}
}
} while (numChange > 0);
return graph;
}
public static <NodeLabel, EdgeLabel> NodeLabel getDestNodeLabel(
Graph<NodeLabel, EdgeLabel> graph, Edge edge) {
return graph.getNodeLabel(edge.getDestNodeID());
}