X-Git-Url: http://git.megacz.com/?p=sbp.git;a=blobdiff_plain;f=src%2Fedu%2Fberkeley%2Fsbp%2FNode.java;h=1168c78419ff63f58a555117096ae66a1d419c3c;hp=532a4a8afa896b1d38fc8ea18b610296a25a9302;hb=9680415a3e36240dcac947b3d4d1ad6b312c4fce;hpb=e0642797cf50d33913d996056146bd5ca79ddbd8

diff --git a/src/edu/berkeley/sbp/Node.java b/src/edu/berkeley/sbp/Node.java
index 532a4a8..1168c78 100644
--- a/src/edu/berkeley/sbp/Node.java
+++ b/src/edu/berkeley/sbp/Node.java
@@ -12,7 +12,20 @@ import java.lang.reflect.*;
 
 class Node<OtherNode extends Node>
     implements IntegerMappable,
-               GraphViz.ToGraphViz {
+               GraphViz.ToGraphViz,
+               Iterable<OtherNode> {
+
+    protected       FastSet<OtherNode> predecessors = new FastSet<OtherNode>();
+    protected       FastSet<OtherNode> successors = new FastSet<OtherNode>();
+    //private       HashSet<OtherNode> predecessors = new HashSet<OtherNode>();
+    //private       HashSet<OtherNode> successors = new HashSet<OtherNode>();
+
+    public Iterator<OtherNode> iterator() { return predecessors.iterator(); }
+
+    public boolean noSuccessors() { return successors.size()==0; }
+    public boolean predecessorsContains(OtherNode n) {
+        return predecessors.contains(n);
+    }
 
     // GraphViz //////////////////////////////////////////////////////////////////////////////