--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.ruby.runtime/src/com/oracle/truffle/ruby/runtime/lookup/LookupNode.java	Mon Jan 06 17:12:09 2014 +0000
@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved. This
+ * code is released under a tri EPL/GPL/LGPL license. You can use it,
+ * redistribute it and/or modify it under the terms of the:
+ *
+ * Eclipse Public License version 1.0
+ * GNU General Public License version 2
+ * GNU Lesser General Public License version 2.1
+ */
+package com.oracle.truffle.ruby.runtime.lookup;
+
+import java.util.*;
+
+import com.oracle.truffle.api.*;
+import com.oracle.truffle.ruby.runtime.methods.*;
+
+/**
+ * A node in the lookup graph. We abstract from modules and classes because with includes and
+ * singletons and so on there are more nodes in the graph than there are classes and modules.
+ */
+public interface LookupNode {
+
+    boolean setClassVariableIfAlreadySet(String variableName, Object value);
+
+    Object lookupConstant(String constantName);
+
+    Object lookupClassVariable(String variableName);
+
+    RubyMethod lookupMethod(String methodName);
+
+    Assumption getUnmodifiedAssumption();
+
+    Set<String> getClassVariables();
+
+    void getMethods(Map<String, RubyMethod> methods);
+
+}