public FriendshipGraph<Friend> getStudentsAtTheCollege(String college) {
UndirGraph<Friend> collegeSubgraph = new UndirGraph<Friend>();
int vCount = this.graph.numberOfVertices();
for (int i = 0; i < vCount; i++) {
if (this.graph.vertexInfoOf(i).school.compareTo(college) == 0)
collegeSubgraph.addVertex(this.graph.vertexInfoOf(i));
}
vCount = collegeSubgraph.numberOfVertices();
for (int i = 0; i < vCount; i++) {
int firstRootRef = this.graph.vertexNumberOf(collegeSubgraph.vertexInfoOf(i));
for (int j = 0; j < vCount; j++) {
int secondRootRef = this.graph.vertexNumberOf(collegeSubgraph.vertexInfoOf(j));
if (this.graph.containsEdge(firstRootRef, new Neighbor(secondRootRef)))
collegeSubgraph.addEdge(i, new Neighbor(j));
}
}
return new FriendshipGraph<Friend>(collegeSubgraph);
}
