X-Git-Url: http://git.megacz.com/?p=sbp.git;a=blobdiff_plain;f=src%2Fedu%2Fberkeley%2Fsbp%2FAtom.java;h=2589ddeabb9d435ff5e47a09531175b3d6a0d98f;hp=3b7ce1fa558692f388fc21ed6fd89f6587591eed;hb=c366dacc334fe2e35835164f5a37d3eebb2ca6d5;hpb=6b53048f4413f3c618acc3581d0b4f60a236a9bc

diff --git a/src/edu/berkeley/sbp/Atom.java b/src/edu/berkeley/sbp/Atom.java
index 3b7ce1f..2589dde 100644
--- a/src/edu/berkeley/sbp/Atom.java
+++ b/src/edu/berkeley/sbp/Atom.java
@@ -11,21 +11,13 @@ import edu.berkeley.sbp.*;
 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; }
 
-    /** equality is based on the underlying <tt>Topology</tt> */
-    public int hashCode() { return top().hashCode(); }
-    
-    /** equality is based on the underlying <tt>Topology</tt> */
-    public boolean equals(Object o) { return o != null && o instanceof Atom && ((Atom)o).top().equals(top()); }
-
-    /** declared abstract to force subclasses to override it in a useful manner */
-    public abstract String toString();
-
     // Topology Thunks //////////////////////////////////////////////////////////////////////////////
 
-    public Topology<T>       unwrap() { return top().unwrap(); }
+    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); }
@@ -34,6 +26,8 @@ public abstract class Atom<T extends Token> extends Element implements Topology<
     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 //////////////////////////////////////////////////////////////////////////////
 
@@ -41,7 +35,7 @@ public abstract class Atom<T extends Token> extends Element implements Topology<
         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 String toString() { return e.toString(); /* FIXME should be toAtom() */ }
     }
     
     public static class Invert<T extends Token> extends Atom<T> {
@@ -51,5 +45,14 @@ public abstract class Atom<T extends Token> extends Element implements Topology<
         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.CharToken.rightBrace.union(edu.berkeley.sbp.misc.CharToken.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; }
+    }
+    
 }