@Nullable("for boxed values which can't be compared by ==")
private Integer getOrCreateEqClassIndex(@NotNull DfaValue dfaValue) {
int i = getEqClassIndex(dfaValue);
if (i != -1) return i;
if (!canBeInRelation(dfaValue)
|| !canBeReused(dfaValue)
&& !(((DfaBoxedValue) dfaValue).getWrappedValue() instanceof DfaConstValue)) {
return null;
}
int freeIndex = myEqClasses.indexOf(null);
int resultIndex = freeIndex >= 0 ? freeIndex : myEqClasses.size();
EqClass aClass = new EqClass(myFactory);
aClass.add(dfaValue.getID());
if (freeIndex >= 0) {
myEqClasses.set(freeIndex, aClass);
} else {
myEqClasses.add(aClass);
}
addToMap(dfaValue.getID(), resultIndex);
return resultIndex;
}
private boolean uniteClasses(int c1Index, int c2Index) {
EqClass c1 = myEqClasses.get(c1Index);
EqClass c2 = myEqClasses.get(c2Index);
Set<DfaVariableValue> vars = ContainerUtil.newTroveSet();
Set<DfaVariableValue> negatedVars = ContainerUtil.newTroveSet();
int[] cs = new int[c1.size() + c2.size()];
c1.set(0, cs, 0, c1.size());
c2.set(0, cs, c1.size(), c2.size());
int nConst = 0;
for (int c : cs) {
DfaValue dfaValue = unwrap(myFactory.getValue(c));
if (dfaValue instanceof DfaConstValue) nConst++;
if (dfaValue instanceof DfaVariableValue) {
DfaVariableValue variableValue = (DfaVariableValue) dfaValue;
if (variableValue.isNegated()) {
negatedVars.add(variableValue.createNegated());
} else {
vars.add(variableValue);
}
}
if (nConst > 1) return false;
}
if (ContainerUtil.intersects(vars, negatedVars)) return false;
TLongArrayList c2Pairs = new TLongArrayList();
long[] distincts = myDistinctClasses.toArray();
for (long distinct : distincts) {
int pc1 = low(distinct);
int pc2 = high(distinct);
boolean addedToC1 = false;
if (pc1 == c1Index || pc2 == c1Index) {
addedToC1 = true;
}
if (pc1 == c2Index || pc2 == c2Index) {
if (addedToC1) return false;
c2Pairs.add(distinct);
}
}
EqClass newClass = new EqClass(c1);
myEqClasses.set(c1Index, newClass);
for (int i = 0; i < c2.size(); i++) {
int c = c2.get(i);
newClass.add(c);
removeFromMap(c, c2Index);
addToMap(c, c1Index);
}
for (int i = 0; i < c2Pairs.size(); i++) {
long c = c2Pairs.get(i);
myDistinctClasses.remove(c);
myDistinctClasses.add(createPair(c1Index, low(c) == c2Index ? high(c) : low(c)));
}
myEqClasses.set(c2Index, null);
return true;
}