src/share/tools/IdealGraphVisualizer/View/src/com/sun/hotspot/igv/view/DiagramViewModel.java

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 1998, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1998, 2016, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this

@@ -443,7 +443,50 @@
     }
 
     void close() {
         filterChain.getChangedEvent().removeListener(filterChainChangedListener);
         sequenceFilterChain.getChangedEvent().removeListener(filterChainChangedListener);
-}
+    }
+
+    Iterable<InputGraph> getGraphsForward() {
+        return new Iterable<InputGraph>() {
+
+            @Override
+            public Iterator<InputGraph> iterator() {
+                return new Iterator<InputGraph>() {
+                    int index = getFirstPosition();
+
+                    @Override
+                    public boolean hasNext() {
+                        return index + 1 < graphs.size();
+                    }
+
+                    @Override
+                    public InputGraph next() {
+                        return graphs.get(++index);
+                    }
+                };
+            }
+        };
+    }
+
+    Iterable<InputGraph> getGraphsBackward() {
+        return new Iterable<InputGraph>() {
+            @Override
+            public Iterator<InputGraph> iterator() {
+                return new Iterator<InputGraph>() {
+                    int index = getFirstPosition();
+
+                    @Override
+                    public boolean hasNext() {
+                        return index - 1 > 0;
+                    }
+
+                    @Override
+                    public InputGraph next() {
+                        return graphs.get(--index);
+                    }
+                };
+            }
+        };
+    }
 }