checkpoint

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

diff --git a/src/edu/berkeley/sbp/Tree.java b/src/edu/berkeley/sbp/Tree.java
index 102817c..2ab70c8 100644 (file)
--- a/src/edu/berkeley/sbp/Tree.java
+++ b/src/edu/berkeley/sbp/Tree.java
@@ -39,4 +39,7 @@ public class Tree<T> extends PrintableTree<Tree<T>> implements Iterable<Tree<T>>
 
     protected String headToString() { return head==null?null:head.toString(); }
     protected String headToJava()   { return head==null?null:StringUtil.toJavaString(head+""); }
 
     protected String headToString() { return head==null?null:head.toString(); }
     protected String headToJava()   { return head==null?null:StringUtil.toJavaString(head+""); }

+    protected String left()   { return "{"; }
+    protected String right()  { return "}"; }
+    protected boolean ignoreSingleton() { return false; }

 }
 }