@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 final boolean accept(final ASTVisitor visitor) {
if (exprs.length == 0) {
if (oneOf(func, COLLECTION, URI_COLLECTION) && !visitor.lock(DBLocking.COLL)) return false;
} else if (!(exprs[0] instanceof Str)) {
if (!visitor.lock(null)) return false;
} else {
final QueryInput qi = new QueryInput(string(((Str) exprs[0]).string()));
if (qi.db == null && !visitor.lock(null)) return false;
if (!visitor.lock(qi.db)) return false;
}
return super.accept(visitor);
}