/**
* This method returns true if set A is a subset of set B
*
* @return True if this set is a subset of setB
*/
public boolean isSubset(Bitset setB) {
// if one or both sets is null
if (isNull() || setB.isNull()) return false;
// if _this_ set has more elements than setB it can't be a subset
if (cardinality() > setB.cardinality()) return false;
// temp is all the elements that are both in A and B
Bitset temp = intersect(setB);
// if set A is the same as temp, then all elements in A are also in B
if (equals(temp)) return true;
else return false;
}
private static Bitset[] createBitsets(
OutputModelFactory factory, IntervalSet set, boolean useZeroOffset) {
List<Bitset> bitsetList = new ArrayList<Bitset>();
for (int ttype : set.toArray()) {
Bitset current = !bitsetList.isEmpty() ? bitsetList.get(bitsetList.size() - 1) : null;
if (current == null || ttype > (current.shift + 63)) {
current = new Bitset();
if (useZeroOffset && ttype >= 0 && ttype < 63) {
current.shift = 0;
} else {
current.shift = ttype;
}
bitsetList.add(current);
}
current.ttypes.add(
factory.getGenerator().target.getTokenTypeAsTargetLabel(factory.getGrammar(), ttype));
}
return bitsetList.toArray(new Bitset[bitsetList.size()]);
}