1 /*
   2  * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 package java.lang.reflect;
  25 
  26 import java.lang.module.ModuleDescriptor;
  27 
  28 /**
  29  * A helper class intended to be injected into java.lang.reflect using the
  30  * java -Xpatch option. The helper class provides access to package private
  31  * methods in java.lang.reflect.Module.
  32  */
  33 
  34 public final class ModuleHelper {
  35 
  36     private ModuleHelper() { }
  37 
  38     /**
  39      * Creates a named module but without defining the module to the VM.
  40      */
  41     public static Module newModule(ClassLoader loader, ModuleDescriptor descriptor) {
  42         return new Module(loader, descriptor);
  43     }
  44 
  45     /**
  46      * Updates module {@code from} to that it reads module {@code to} without
  47      * notifying the VM.
  48      */
  49     public static void addReadsNoSync(Module from, Module to) {
  50         from.implAddReadsNoSync(to);
  51     }
  52 
  53     /**
  54      * Updates module {@code from} so that it exports package {@code pkg}
  55      * to module {@code to} but without notifying the VM. If {@code to} is
  56      * {@code null} then the package is exported unconditionally.
  57      */
  58     public static void addExportsNoSync(Module from, String pkg, Module to) {
  59         from.implAddExportsNoSync(pkg, to);
  60     }
  61 
  62     /**
  63      * Adds a package to a module without notifying the VM.
  64      */
  65     public static void addPackageNoSync(Module m, String pkg) {
  66         m.implAddPackageNoSync(pkg);
  67     }
  68 
  69 }