--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/truffle/com.oracle.truffle.tck/src/com/oracle/truffle/tck/MapTruffleObject.java	Fri Dec 11 15:20:27 2015 +0100
@@ -0,0 +1,120 @@
+/*
+ * Copyright (c) 2015, 2015, 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
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package com.oracle.truffle.tck;
+
+import java.util.Map;
+
+import com.oracle.truffle.api.CallTarget;
+import com.oracle.truffle.api.Truffle;
+import com.oracle.truffle.api.frame.VirtualFrame;
+import com.oracle.truffle.api.interop.ForeignAccess;
+import com.oracle.truffle.api.interop.ForeignAccess.Factory;
+import com.oracle.truffle.api.interop.Message;
+import com.oracle.truffle.api.interop.TruffleObject;
+import com.oracle.truffle.api.nodes.RootNode;
+
+@SuppressWarnings({"rawtypes", "unchecked"})
+public final class MapTruffleObject implements TruffleObject {
+
+    private final Map map;
+
+    public MapTruffleObject(Map map) {
+        this.map = map;
+    }
+
+    public ForeignAccess getForeignAccess() {
+        return ForeignAccess.create(new MapForeignAccessFactory());
+    }
+
+    private static class MapForeignAccessFactory implements Factory {
+
+        public boolean canHandle(TruffleObject obj) {
+            return obj instanceof MapTruffleObject;
+        }
+
+        public CallTarget accessMessage(Message tree) {
+            if (Message.IS_NULL.equals(tree)) {
+                return Truffle.getRuntime().createCallTarget(RootNode.createConstantNode(false));
+            } else if (Message.IS_EXECUTABLE.equals(tree)) {
+                return Truffle.getRuntime().createCallTarget(RootNode.createConstantNode(false));
+            } else if (Message.IS_BOXED.equals(tree)) {
+                return Truffle.getRuntime().createCallTarget(RootNode.createConstantNode(false));
+            } else if (Message.HAS_SIZE.equals(tree)) {
+                return Truffle.getRuntime().createCallTarget(RootNode.createConstantNode(true));
+            } else if (Message.READ.equals(tree)) {
+                return Truffle.getRuntime().createCallTarget(new MapReadNode());
+            } else if (Message.WRITE.equals(tree)) {
+                return Truffle.getRuntime().createCallTarget(new MapWriteNode());
+            } else if (Message.GET_SIZE.equals(tree)) {
+                return Truffle.getRuntime().createCallTarget(new MapSizeNode());
+            } else {
+                throw new IllegalArgumentException(tree.toString() + " not supported");
+            }
+        }
+    }
+
+    private static class MapWriteNode extends RootNode {
+        protected MapWriteNode() {
+            super(TckLanguage.class, null, null);
+        }
+
+        @Override
+        public Object execute(VirtualFrame frame) {
+            MapTruffleObject map = (MapTruffleObject) ForeignAccess.getReceiver(frame);
+            Object key = ForeignAccess.getArguments(frame).get(0);
+            Object value = ForeignAccess.getArguments(frame).get(1);
+            map.map.put(key, value);
+            return value;
+        }
+    }
+
+    private static class MapReadNode extends RootNode {
+        protected MapReadNode() {
+            super(TckLanguage.class, null, null);
+        }
+
+        @Override
+        public Object execute(VirtualFrame frame) {
+            MapTruffleObject map = (MapTruffleObject) ForeignAccess.getReceiver(frame);
+            Object key = ForeignAccess.getArguments(frame).get(0);
+            return map.map.get(key);
+        }
+
+    }
+
+    private static class MapSizeNode extends RootNode {
+        protected MapSizeNode() {
+            super(TckLanguage.class, null, null);
+        }
+
+        @Override
+        public Object execute(VirtualFrame frame) {
+            MapTruffleObject map = (MapTruffleObject) ForeignAccess.getReceiver(frame);
+            return map.map.size();
+        }
+
+    }
+
+}