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. 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.ModuleDescriptor; 29 30 /* 31 * SystemModules class will be generated at link time to create 32 * ModuleDescriptor for the system modules directly to improve 33 * the module descriptor reconstitution time. 34 * 35 * This will skip parsing of module-info.class file and validating 36 * names such as module name, package name, service and provider type names. 37 * It also avoids taking a defensive copy of any collection. 38 * 39 * @see jdk.tools.jlink.internal.plugins.SystemModulesPlugin 40 */ 41 public final class SystemModules { 42 /** 43 * Name of the system modules. 44 * 45 * This array provides a way for SystemModuleFinder to fallback 46 * and read module-info.class from the run-time image instead of 47 * the fastpath. 48 */ 49 public static final String[] MODULE_NAMES = new String[0]; 50 51 /** 52 * Number of packages in the boot layer from the installed modules. 53 * 54 * Don't make it final to avoid inlining during compile time as 55 * the value will be changed at jlink time. 56 */ 57 public static int PACKAGES_IN_BOOT_LAYER = 1024; 58 59 /** 60 * @return {@code false} if there are no split packages in the run-time 61 * image, {@code true} if there are or if it's not been checked. 62 */ 63 public static boolean hasSplitPackages() { 64 return true; 65 } 66 67 /** 68 * Returns a non-empty array of ModuleDescriptors in the run-time image. 69 * 70 * When running an exploded image it returns an empty array. 71 */ 72 public static ModuleDescriptor[] descriptors() { 73 throw new InternalError("expected to be overridden at link time"); 74 } 75 76 /** 77 * Returns a non-empty array of ModuleHashes recorded in each module 78 * in the run-time image. 79 * 80 * When running an exploded image it returns an empty array. 81 */ 82 public static ModuleHashes[] hashes() { 83 throw new InternalError("expected to be overridden at link time"); 84 } 85 86 /** 87 * Returns a non-empty array of ModuleResolutions in the run-time image. 88 */ 89 public static ModuleResolution[] moduleResolutions() { 90 throw new InternalError("expected to be overridden at link time"); 91 } 92 }