--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/src/jdk.dynalink/share/classes/jdk/dynalink/SecureLookupSupplier.java	Tue Mar 15 16:02:00 2016 +0100
@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 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
+ * 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 jdk.dynalink;
+
+import java.lang.invoke.MethodHandles;
+import java.lang.invoke.MethodHandles.Lookup;
+import java.util.Objects;
+
+/**
+ * Provides security-checked access to a {@code MethodHandles.Lookup} object.
+ * See {@link #getLookup()} for details.
+ */
+public class SecureLookupSupplier {
+    /**
+     * The name of a runtime permission required to successfully invoke the
+     * {@link #getLookup()} method.
+     */
+    public static final String GET_LOOKUP_PERMISSION_NAME = "dynalink.getLookup";
+
+    private static final RuntimePermission GET_LOOKUP_PERMISSION = new RuntimePermission(SecureLookupSupplier.GET_LOOKUP_PERMISSION_NAME);
+
+    private final MethodHandles.Lookup lookup;
+
+    /**
+     * Creates a new secure lookup supplier, securing the passed lookup.
+     * @param lookup the lookup to secure. Can not be null.
+     * @throws NullPointerException if null is passed.
+     */
+    public SecureLookupSupplier(final MethodHandles.Lookup lookup) {
+        this.lookup = Objects.requireNonNull(lookup, "lookup");
+    }
+
+    /**
+     * Returns the lookup secured by this {@code SecureLookupSupplier}.
+     * @return the lookup secured by this {@code SecureLookupSupplier}.
+     * @throws SecurityException if the secured lookup isn't the
+     * {@link MethodHandles#publicLookup()}, and a security manager is present,
+     * and a check for {@code RuntimePermission("dynalink.getLookup")} fails.
+     */
+    public final Lookup getLookup() {
+        final SecurityManager sm = System.getSecurityManager();
+        if (sm != null && lookup != MethodHandles.publicLookup()) {
+            sm.checkPermission(GET_LOOKUP_PERMISSION);
+        }
+        return lookup;
+    }
+
+    /**
+     * Returns the value of {@link #getLookup()} without a security check. Can
+     * be used by subclasses to access the lookup quickly.
+     * @return same as returned value of {@link #getLookup()}.
+     */
+    protected final Lookup getLookupPrivileged() {
+        return lookup;
+    }
+}