X-Git-Url: http://git.megacz.com/?p=sbp.git;a=blobdiff_plain;f=src%2Fedu%2Fberkeley%2Fsbp%2FSequence.java;h=a5149f2d094ef3dee1b4712f7bc67713eeb9650c;hp=fcff530b8db6eaff5009d3943797c80d29d031d2;hb=87f214f3da9f43c3ab93923313845c372f9a96be;hpb=0a0227b9180534d2a431f3d6e08a398bde2244c4

diff --git a/src/edu/berkeley/sbp/Sequence.java b/src/edu/berkeley/sbp/Sequence.java
index fcff530..a5149f2 100644
--- a/src/edu/berkeley/sbp/Sequence.java
+++ b/src/edu/berkeley/sbp/Sequence.java
@@ -35,6 +35,14 @@ public abstract class Sequence extends Element implements Iterable<Element> {
 
     ////////////////////////////////////////////////////////////////////////////////
 
+    public Topology noFollow() { return null; }
+
+    Topology toAtom() {
+        if (elements.length>1) throw new RuntimeException("cannot invoke toAtom() on a Sequence with " + elements.length + " elements: " + this);
+        if (elements.length==0) return null;
+        return elements[0].toAtom();
+    }
+
     protected final Element[] elements;
 
     final HashSet<Sequence> needs;