| /* |
| * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package jdk.internal.jrtfs; |
| |
| import java.io.IOException; |
| import java.net.URISyntaxException; |
| import java.net.URL; |
| import java.nio.file.Files; |
| import java.nio.file.FileSystem; |
| import java.nio.file.FileSystems; |
| import java.nio.file.FileSystemNotFoundException; |
| import java.nio.file.Path; |
| import java.nio.file.Paths; |
| import java.security.AccessController; |
| import java.security.CodeSource; |
| import java.security.PrivilegedAction; |
| |
| import jdk.internal.jimage.ImageReader; |
| import jdk.internal.jimage.ImageReader.Node; |
| |
| /** |
| * @implNote This class needs to maintain JDK 8 source compatibility. |
| * |
| * It is used internally in the JDK to implement jimage/jrtfs access, |
| * but also compiled and delivered as part of the jrtfs.jar to support access |
| * to the jimage file provided by the shipped JDK by tools running on JDK 8. |
| */ |
| abstract class SystemImage { |
| |
| abstract Node findNode(String path) throws IOException; |
| abstract byte[] getResource(Node node) throws IOException; |
| abstract void close() throws IOException; |
| |
| static SystemImage open() throws IOException { |
| if (modulesImageExists) { |
| // open a .jimage and build directory structure |
| final ImageReader image = ImageReader.open(moduleImageFile); |
| image.getRootDirectory(); |
| return new SystemImage() { |
| @Override |
| Node findNode(String path) throws IOException { |
| return image.findNode(path); |
| } |
| @Override |
| byte[] getResource(Node node) throws IOException { |
| return image.getResource(node); |
| } |
| @Override |
| void close() throws IOException { |
| image.close(); |
| } |
| }; |
| } |
| if (Files.notExists(explodedModulesDir)) |
| throw new FileSystemNotFoundException(explodedModulesDir.toString()); |
| return new ExplodedImage(explodedModulesDir); |
| } |
| |
| static final String RUNTIME_HOME; |
| // "modules" jimage file Path |
| final static Path moduleImageFile; |
| // "modules" jimage exists or not? |
| final static boolean modulesImageExists; |
| // <JAVA_HOME>/modules directory Path |
| static final Path explodedModulesDir; |
| |
| static { |
| PrivilegedAction<String> pa = SystemImage::findHome; |
| RUNTIME_HOME = AccessController.doPrivileged(pa); |
| |
| FileSystem fs = FileSystems.getDefault(); |
| moduleImageFile = fs.getPath(RUNTIME_HOME, "lib", "modules"); |
| explodedModulesDir = fs.getPath(RUNTIME_HOME, "modules"); |
| |
| modulesImageExists = AccessController.doPrivileged( |
| new PrivilegedAction<Boolean>() { |
| @Override |
| public Boolean run() { |
| return Files.isRegularFile(moduleImageFile); |
| } |
| }); |
| } |
| |
| /** |
| * Returns the appropriate JDK home for this usage of the FileSystemProvider. |
| * When the CodeSource is null (null loader) then jrt:/ is the current runtime, |
| * otherwise the JDK home is located relative to jrt-fs.jar. |
| */ |
| private static String findHome() { |
| CodeSource cs = SystemImage.class.getProtectionDomain().getCodeSource(); |
| if (cs == null) |
| return System.getProperty("java.home"); |
| |
| // assume loaded from $TARGETJDK/lib/jrt-fs.jar |
| URL url = cs.getLocation(); |
| if (!url.getProtocol().equalsIgnoreCase("file")) |
| throw new InternalError(url + " loaded in unexpected way"); |
| try { |
| Path lib = Paths.get(url.toURI()).getParent(); |
| if (!lib.getFileName().toString().equals("lib")) |
| throw new InternalError(url + " unexpected path"); |
| |
| return lib.getParent().toString(); |
| } catch (URISyntaxException e) { |
| throw new InternalError(e); |
| } |
| } |
| } |