--- a/jdk/src/share/classes/sun/dyn/Access.java Wed Jul 05 17:38:31 2017 +0200
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,109 +0,0 @@
-/*
- * Copyright (c) 2008, 2009, 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 sun.dyn;
-
-import sun.reflect.Reflection;
-
-/**
- * Access control to this package.
- * Classes in other packages can attempt to acquire the access token,
- * but will fail if they are not recognized as friends.
- * Certain methods in this package, although public, require a non-null
- * access token in order to proceed; they act like package-private methods.
- * @author jrose
- */
-
-public class Access {
-
- private Access() { }
-
- /**
- * The heart of this pattern: The list of classes which are
- * permitted to acquire the access token, and become honorary
- * members of this package.
- */
- private static final String[] FRIENDS = {
- "java.dyn.", "sun.dyn."
- };
-
- /**
- * The following object is NOT public. That's the point of the pattern.
- * It is package-private, so that any member of this package
- * can acquire the access token, and give it away to trusted friends.
- */
- static final Access TOKEN = new Access();
-
- /**
- * @return Access.TOKEN, if the caller is a friend of this package
- */
- public static Access getToken() {
- Class<?> callc = Reflection.getCallerClass(2);
- if (isFriend(callc))
- return TOKEN;
- else
- throw new IllegalAccessError("bad caller: " + callc);
- }
-
- /** Is the given name the name of a class which could be our friend? */
- public static boolean isFriendName(String name) {
- for (String friend : FRIENDS) {
- if (name.startsWith(friend))
- return true;
- }
- return false;
- }
-
- /** Is the given class a friend? True if {@link #isFriendName},
- * and the given class also shares a class loader with us.
- */
- public static boolean isFriend(Class<?> c) {
- return isFriendName(c.getName()) && c.getClassLoader() == CLASS_LOADER;
- }
-
- private static final ClassLoader CLASS_LOADER = Access.class.getClassLoader();
-
- /**
- * Throw an IllegalAccessError if the caller does not possess
- * the Access.TOKEN.
- * @param must be Access.TOKEN
- */
- public static void check(Access token) {
- if (token == null)
- fail();
- // else it must be the unique Access.TOKEN
- assert(token == Access.TOKEN);
- }
- private static void fail() {
- final int CALLER_DEPTH = 3;
- // 0: Reflection.getCC, 1: this.fail, 2: Access.*, 3: caller
- Class<?> callc = Reflection.getCallerClass(CALLER_DEPTH);
- throw new IllegalAccessError("bad caller: " + callc);
- }
-
- static {
- //sun.reflect.Reflection.registerMethodsToFilter(MH.class, "getToken");
- }
-}