@Override
public boolean accept(final ASTVisitor visitor) {
for (final Expr e : preds) {
visitor.enterFocus();
if (!e.accept(visitor)) return false;
visitor.exitFocus();
}
return root.accept(visitor);
}
@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;
}