AndImpl a = (AndImpl) c;
tokens.addAll(extractFulltext(a.getConstraint1()));
tokens.addAll(extractFulltext(a.getConstraint2()));
}
if (c instanceof OrImpl) {
OrImpl o = (OrImpl) c;
tokens.addAll(extractFulltext(o.getConstraint1()));
tokens.addAll(extractFulltext(o.getConstraint2()));
}
return tokens;
}