1 /*
   2  * Copyright (c) 2018, 2020, 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.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package jdk.internal.module;
  27 
  28 import java.lang.module.Configuration;
  29 import java.lang.module.ModuleFinder;
  30 import java.util.Map;
  31 import java.util.Set;
  32 import java.util.function.Function;
  33 
  34 import jdk.internal.misc.VM;
  35 
  36 /**
  37  * Used by ModuleBootstrap to obtain the archived system modules and finder.
  38  */
  39 final class ArchivedModuleGraph {
  40     private static ArchivedModuleGraph archivedModuleGraph;
  41 
  42     private final boolean hasSplitPackages;
  43     private final boolean hasIncubatorModules;
  44     private final ModuleFinder finder;
  45     private final Configuration configuration;
  46     private final Function<String, ClassLoader> classLoaderFunction;
  47     private final Map<String, Set<String>> concealedPackagesToOpen;
  48     private final Map<String, Set<String>> exportedPackagesToOpen;
  49 
  50     public ArchivedModuleGraph(boolean hasSplitPackages,
  51                                boolean hasIncubatorModules,
  52                                ModuleFinder finder,
  53                                Configuration configuration,
  54                                Function<String, ClassLoader> classLoaderFunction,
  55                                Map<String, Set<String>> concealedPackagesToOpen,
  56                                Map<String, Set<String>> exportedPackagesToOpen) {
  57         this.hasSplitPackages = hasSplitPackages;
  58         this.hasIncubatorModules = hasIncubatorModules;
  59         this.finder = finder;
  60         this.configuration = configuration;
  61         this.classLoaderFunction = classLoaderFunction;
  62         this.concealedPackagesToOpen = concealedPackagesToOpen;
  63         this.exportedPackagesToOpen = exportedPackagesToOpen;
  64     }
  65 
  66     ModuleFinder finder() {
  67         return finder;
  68     }
  69 
  70     Configuration configuration() {
  71         return configuration;
  72     }
  73 
  74     Function<String, ClassLoader> classLoaderFunction() {
  75         return classLoaderFunction;
  76     }
  77 
  78     Map<String, Set<String>> concealedPackagesToOpen() {
  79         return concealedPackagesToOpen;
  80     }
  81 
  82     Map<String, Set<String>> exportedPackagesToOpen() {
  83         return exportedPackagesToOpen;
  84     }
  85 
  86     boolean hasSplitPackages() {
  87         return hasSplitPackages;
  88     }
  89 
  90     boolean hasIncubatorModules() {
  91         return hasIncubatorModules;
  92     }
  93 
  94     /**
  95      * Returns the ArchivedModuleGraph for the given initial module.
  96      */
  97     static ArchivedModuleGraph get(String mainModule) {
  98         ArchivedModuleGraph graph = archivedModuleGraph;
  99         // We only allow the unnamed module (default) case for now
 100         if (mainModule == null) {
 101             return graph;
 102         } else {
 103             return null;
 104         }
 105     }
 106 
 107     /**
 108      * Archive the module graph for the given initial module.
 109      */
 110     static void archive(ArchivedModuleGraph graph) {
 111         archivedModuleGraph = graph;
 112     }
 113 
 114     static {
 115         VM.initializeFromArchive(ArchivedModuleGraph.class);
 116     }
 117 }