@Override
public boolean accept(final ASTVisitor visitor) {
if (root == null) {
if (!visitor.lock(DBLocking.CTX)) return false;
} else if (!root.accept(visitor)) {
return false;
}
visitor.enterFocus();
if (!visitAll(visitor, steps)) return false;
visitor.exitFocus();
return true;
}
@Override
public boolean accept(final ASTVisitor visitor) {
return super.accept(visitor)
&& query.accept(visitor)
&& (occ == null || visitAll(visitor, occ));
}