author | rriggs |
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/* |
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* Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package jdk.internal.module; |
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import java.lang.module.Configuration; |
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import java.lang.module.ResolvedModule; |
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import java.util.HashMap; |
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import java.util.HashSet; |
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import java.util.Map; |
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import java.util.Set; |
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import java.util.function.Function; |
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import jdk.internal.loader.ClassLoaders; |
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/** |
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* Supports the mapping of modules to class loaders. The set of modules mapped |
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* to the boot and platform class loaders is generated at build time from |
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* this source file. |
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*/ |
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public final class ModuleLoaderMap { |
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/** |
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* Maps the system modules to the built-in class loaders. |
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*/ |
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public static final class Mapper implements Function<String, ClassLoader> { |
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private final Map<String, ClassLoader> map; |
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Mapper(Map<String, ClassLoader> map) { |
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this.map = map; // defensive copy not needed |
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} |
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@Override |
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public ClassLoader apply(String name) { |
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return map.get(name); |
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} |
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} |
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/** |
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* Returns the names of the modules defined to the boot loader. |
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*/ |
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public static Set<String> bootModules() { |
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// The list of boot modules generated at build time. |
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String[] BOOT_MODULES = new String[] { "@@BOOT_MODULE_NAMES@@" }; |
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Set<String> bootModules = new HashSet<>(BOOT_MODULES.length); |
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for (String mn : BOOT_MODULES) { |
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bootModules.add(mn); |
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} |
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return bootModules; |
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} |
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/** |
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* Returns the names of the modules defined to the platform loader. |
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*/ |
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public static Set<String> platformModules() { |
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// The list of platform modules generated at build time. |
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String[] PLATFORM_MODULES = new String[] { "@@PLATFORM_MODULE_NAMES@@" }; |
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Set<String> platformModules = new HashSet<>(PLATFORM_MODULES.length); |
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for (String mn : PLATFORM_MODULES) { |
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platformModules.add(mn); |
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} |
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return platformModules; |
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} |
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/** |
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* Returns the function to map modules in the given configuration to the |
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* built-in class loaders. |
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*/ |
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static Function<String, ClassLoader> mappingFunction(Configuration cf) { |
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Set<String> bootModules = bootModules(); |
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Set<String> platformModules = platformModules(); |
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ClassLoader platformClassLoader = ClassLoaders.platformClassLoader(); |
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ClassLoader appClassLoader = ClassLoaders.appClassLoader(); |
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Map<String, ClassLoader> map = new HashMap<>(); |
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for (ResolvedModule resolvedModule : cf.modules()) { |
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String mn = resolvedModule.name(); |
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if (!bootModules.contains(mn)) { |
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if (platformModules.contains(mn)) { |
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map.put(mn, platformClassLoader); |
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} else { |
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map.put(mn, appClassLoader); |
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} |
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} |
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} |
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return new Mapper(map); |
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} |
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} |