- protected abstract Topology<T> top();
- public abstract String toString();
-
- public Topology toAtom() { return this; }
-
- // Topology Thunks //////////////////////////////////////////////////////////////////////////////
-
- public Topology<T> unwrap() { return top().unwrap(); }
- public Topology<T> empty() { return top().empty(); }
- public boolean contains(T v) { return top().contains(v); }
- public Topology<T> intersect(Topology<T> t) { return top().intersect(t); }
- public Topology<T> minus(Topology<T> t) { return top().minus(t); }
- public Topology<T> union(Topology<T> t) { return top().union(t); }
- public Topology<T> complement() { return top().complement(); }
- public boolean disjoint(Topology<T> t) { return top().disjoint(t); }
- public boolean containsAll(Topology<T> t) { return top().containsAll(t); }
- public int hashCode() { return top().hashCode(); }
- public boolean equals(Object o) { return o != null && o instanceof Atom && ((Atom)o).top().equals(top()); }
-
- // Subclasses //////////////////////////////////////////////////////////////////////////////
-
- public static class Infer<T extends Token> extends Atom<T> {
- private final Element e;
- public Infer(Element e) { this.e = e; }
- public Topology<T> top() { return (Topology<T>)e.toAtom(); }
- public String toString() { return e.toString(); /* FIXME should be toAtom() */ }
- }
-
- public static class Invert<T extends Token> extends Atom<T> {
- private final Atom<T> a;
- public Invert(Atom<T> a) { this.a = a; }
- public Topology<T> top() { return ((Topology<T>)a.top()).complement(); }
- public String toString() { return "~"+a; }
- }
-
- public static class Hack<T extends Token> extends Atom<T> {
- private final Atom<T> a;
- static final Topology leftright =
- edu.berkeley.sbp.misc.CharRange.rightBrace.union(edu.berkeley.sbp.misc.CharRange.leftBrace);
- public Hack(Atom<T> a) { this.a = a; }
- public Topology<T> top() { return ((Topology<T>)a.top()).minus(leftright); }
- public String toString() { return "~"+a; }
- }
-