1 /* 2 * Copyright (c) 2018, 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.Objects; 31 import jdk.internal.misc.VM; 32 33 /** 34 * Used by ModuleBootstrap to obtain the archived system modules and finder. 35 */ 36 final class ArchivedModuleGraph { 37 private static String archivedMainModule; 38 private static SystemModules archivedSystemModules; 39 private static ModuleFinder archivedModuleFinder; 40 private static Configuration archivedConfiguration; 41 42 private final SystemModules systemModules; 43 private final ModuleFinder finder; 44 private final Configuration configuration; 45 46 private ArchivedModuleGraph(SystemModules modules, 47 ModuleFinder finder, 48 Configuration configuration) { 49 this.systemModules = modules; 50 this.finder = finder; 51 this.configuration = configuration; 52 } 53 54 SystemModules systemModules() { 55 return systemModules; 56 } 57 58 ModuleFinder finder() { 59 return finder; 60 } 61 62 Configuration configuration() { 63 return configuration; 64 } 65 66 // A factory method that ModuleBootstrap can use to obtain the 67 // ArchivedModuleGraph. 68 static ArchivedModuleGraph get(String mainModule) { 69 if (Objects.equals(mainModule, archivedMainModule) 70 && archivedSystemModules != null 71 && archivedModuleFinder != null 72 && archivedConfiguration != null) { 73 return new ArchivedModuleGraph(archivedSystemModules, 74 archivedModuleFinder, 75 archivedConfiguration); 76 } else { 77 return null; 78 } 79 } 80 81 // Used at CDS dump time 82 static void archive(String mainModule, 83 SystemModules systemModules, 84 ModuleFinder finder, 85 Configuration configuration) { 86 if (archivedMainModule != null) 87 throw new UnsupportedOperationException(); 88 archivedMainModule = mainModule; 89 archivedSystemModules = systemModules; 90 archivedModuleFinder = finder; 91 archivedConfiguration = configuration; 92 } 93 94 static { 95 VM.initializeFromArchive(ArchivedModuleGraph.class); 96 } 97 }