/** Testing that using path validator that accepts all requests finds full paths. */
public void testAllowAll() {
int size = 5;
SimpleGraph<String, DefaultEdge> clique = buildCliqueGraph(size);
for (int i = 0; i < size; i++) {
KShortestPaths<String, DefaultEdge> ksp =
new KShortestPaths<String, DefaultEdge>(
clique,
String.valueOf(i),
30,
Integer.MAX_VALUE,
new PathValidator<String, DefaultEdge>() {
@Override
public boolean isValidPath(
AbstractPathElement<String, DefaultEdge> prevPathElement, DefaultEdge edge) {
// block all paths
return true;
}
});
for (int j = 0; j < size; j++) {
if (j == i) {
continue;
}
List<GraphPath<String, DefaultEdge>> paths = ksp.getPaths(String.valueOf(j));
assertNotNull(paths);
assertEquals(16, paths.size());
}
}
}
/** Testing a ring with only single path allowed between two vertices. */
public void testRing() {
int size = 10;
SimpleGraph<Integer, DefaultEdge> ring = buildRingGraph(size);
for (int i = 0; i < size; i++) {
KShortestPaths<Integer, DefaultEdge> ksp =
new KShortestPaths<Integer, DefaultEdge>(
ring,
i,
2,
Integer.MAX_VALUE,
new PathValidator<Integer, DefaultEdge>() {
@Override
public boolean isValidPath(
AbstractPathElement<Integer, DefaultEdge> prevPathElement, DefaultEdge edge) {
if (prevPathElement == null) {
return true;
}
return Math.abs(
prevPathElement.getVertex()
- Graphs.getOppositeVertex(ring, edge, prevPathElement.getVertex()))
== 1;
}
});
for (int j = 0; j < size; j++) {
if (j == i) {
continue;
}
List<GraphPath<Integer, DefaultEdge>> paths = ksp.getPaths(j);
assertNotNull(paths);
assertEquals(1, paths.size());
}
}
}
/**
* Testing a graph where the validator denies the request to go on an edge which cutting it makes
* the graph disconnected
*/
public void testDisconnected() {
int cliqueSize = 5;
// generate graph of two cliques connected by single edge
SimpleGraph<Integer, DefaultEdge> graph = buildGraphForTestDisconnected(cliqueSize);
for (int i = 0; i < graph.vertexSet().size(); i++) {
KShortestPaths<Integer, DefaultEdge> ksp =
new KShortestPaths<Integer, DefaultEdge>(
graph,
i,
100,
Integer.MAX_VALUE,
new PathValidator<Integer, DefaultEdge>() {
@Override
public boolean isValidPath(
AbstractPathElement<Integer, DefaultEdge> prevPathElement, DefaultEdge edge) {
// accept all requests but the one to pass through the edge connecting
// the two cliques.
DefaultEdge connectingEdge = graph.getEdge(cliqueSize - 1, cliqueSize);
return connectingEdge != edge;
}
});
for (int j = 0; j < graph.vertexSet().size(); j++) {
if (j == i) {
continue;
}
List<GraphPath<Integer, DefaultEdge>> paths = ksp.getPaths(j);
if ((i < cliqueSize && j < cliqueSize) || (i >= cliqueSize && j >= cliqueSize)) {
// within the clique - path should exist
assertNotNull(paths);
assertTrue(paths.size() > 0);
} else {
// else - should not
assertNull(paths);
}
}
}
}