checkpoint

[sbp.git] / src / edu / berkeley / sbp / Atom.java

diff --git a/src/edu/berkeley/sbp/Atom.java b/src/edu/berkeley/sbp/Atom.java
index a5f7e87..55be283 100644 (file)
--- a/src/edu/berkeley/sbp/Atom.java
+++ b/src/edu/berkeley/sbp/Atom.java
@@ -12,6 +12,7 @@ public abstract class Atom<T> extends Element implements Topology<T> {
 
     protected abstract Topology<T> top();
     public    abstract String toString();
+    public             StringBuffer toString(StringBuffer sb) { sb.append(this); return sb; }
 
     // Topology Thunks //////////////////////////////////////////////////////////////////////////////
 
@@ -29,13 +30,15 @@ public abstract class Atom<T> extends Element implements Topology<T> {
 
     // Subclasses //////////////////////////////////////////////////////////////////////////////
 
+    /** an atom which tracks the possible tokenset of some element, provided that element can only match single-token sequences */
     public static class Infer<T extends Input> extends Atom<T> {
         private final Element e;
         public Infer(Element e) { this.e = e; }
         public Topology<T> top() { return (Topology<T>)toAtom(e); }
-        public String toString() { return e.toString(); /* FIXME should be toAtom() */ }
+        public String toString() { return e.toString(); }
     }
     
+    /** an atom which tracks the inverse of some other atom */
     public static class Invert<T extends Input> extends Atom<T> {
         private final Atom<T> a;
         public Invert(Atom<T> a) { this.a = a; }