/** Get the snapshot of union find */
ImmutableMap<ECR, Collection<IRVar>> snapshot() {
SetMultimap<Partition, IRVar> map = uf.snapshot();
ImmutableMap.Builder<ECR, Collection<IRVar>> builder = ImmutableMap.builder();
for (Partition ecr : map.asMap().keySet()) {
builder.put(findRoot((ECR) ecr), ImmutableSet.copyOf(map.asMap().get(ecr)));
}
return builder.build();
}
/**
* ECR-union e1 and e2, return the updated root
*
* @param e1
* @param e2
* @return
*/
private ECR union(ECR e1, ECR e2) {
uf.union(e1, e2);
return findRoot(e1);
}
/**
* Add <code>var</code> into union find
*
* @param var
*/
void add(VarImpl var) {
uf.add(var, var.getECR());
}
Collection<IRVar> getEquivClass(ECR key) {
return uf.getEquivClass(key);
}
void reset() {
uf.reset();
}
private UnionFindECR() {
uf = UnionFind.create();
}
