--- /dev/null	2016-05-31 09:42:47.975716356 -0700
+++ new/src/jdk.vm.compiler/share/classes/org.graalvm.compiler.api.replacements/src/org/graalvm/compiler/api/replacements/ClassSubstitution.java	2016-12-09 00:46:41.252906173 -0800
@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2011, 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.
+ *
+ * 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 org.graalvm.compiler.api.replacements;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Denotes a class that substitutes methods of another specified class. The substitute methods are
+ * exactly those annotated by {@link MethodSubstitution}.
+ */
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.TYPE)
+public @interface ClassSubstitution {
+
+    /**
+     * Specifies the original class.
+     * <p>
+     * If the default value is specified for this element, then a non-default value must be given
+     * for the {@link #className()} element.
+     */
+    Class<?> value() default ClassSubstitution.class;
+
+    /**
+     * Specifies the original class or classes if a single class is being used for multiple
+     * substitutions.
+     * <p>
+     * This method is provided for cases where the original class is not accessible (according to
+     * Java language access control rules).
+     * <p>
+     * If the default value is specified for this element, then a non-default value must be given
+     * for the {@link #value()} element.
+     */
+    String[] className() default {};
+
+    /**
+     * Determines if the substitutions are for classes that may not be part of the runtime.
+     * Substitutions for such classes are omitted if the original classes cannot be found.
+     */
+    boolean optional() default false;
+}