X-Git-Url: http://git.megacz.com/?p=sbp.git;a=blobdiff_plain;f=src%2Fedu%2Fberkeley%2Fsbp%2FAtom.java;h=aac834bfa112991f203fb73670f89b54915e5941;hp=0722d0b8d571905990655c76849c840e21e3de24;hb=96a2822a729e563a64173f22dc184bc972a200ef;hpb=0a0227b9180534d2a431f3d6e08a398bde2244c4

diff --git a/src/edu/berkeley/sbp/Atom.java b/src/edu/berkeley/sbp/Atom.java
index 0722d0b..aac834b 100644
--- a/src/edu/berkeley/sbp/Atom.java
+++ b/src/edu/berkeley/sbp/Atom.java
@@ -8,23 +8,42 @@ import edu.berkeley.sbp.*;
 import edu.berkeley.sbp.*;
 
 /** an element which matches exactly one input token */
-public abstract class Atom<T extends Token> extends Element {
-
-    private final Topology<T> rt;
-
-    public Atom(Topology<T> rt) { this.rt = rt; }
-
-    Topology<T> top() { return rt; }
-
-    void reachable(HashSet<Sequence.Position> h) { /* do-nothing */ }
-
-    /** equality is based on the underlying <tt>Topology</tt> */
-    public int hashCode() { return rt.hashCode(); }
+public abstract class Atom<T extends Token> extends Element implements Topology<T> {
+
+    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(); }
+    }
+    
+    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; }
+    }
     
-    /** equality is based on the underlying <tt>Topology</tt> */
-    public boolean equals(Object o) { return o != null && o instanceof Atom && ((Atom)o).rt.equals(rt); }
-
-    /** declared abstract to force subclasses to override it in a useful manner */
-    public abstract String toString();
 }