1 /* 2 * Copyright (c) 2014, 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.jrtfs; 27 28 import java.net.URISyntaxException; 29 import java.net.URL; 30 import java.nio.file.FileSystem; 31 import java.nio.file.FileSystems; 32 import java.nio.file.Path; 33 import java.nio.file.Paths; 34 import java.security.AccessController; 35 import java.security.CodeSource; 36 import java.security.PrivilegedAction; 37 38 final class SystemImages { 39 private SystemImages() {} 40 41 static final String RUNTIME_HOME; 42 static final Path bootImagePath; 43 static final Path extImagePath; 44 static final Path appImagePath; 45 static { 46 PrivilegedAction<String> pa = SystemImages::findHome; 47 RUNTIME_HOME = AccessController.doPrivileged(pa); 48 49 FileSystem fs = FileSystems.getDefault(); 50 bootImagePath = fs.getPath(RUNTIME_HOME, "lib", "modules", "bootmodules.jimage"); 51 extImagePath = fs.getPath(RUNTIME_HOME, "lib", "modules", "extmodules.jimage"); 52 appImagePath = fs.getPath(RUNTIME_HOME, "lib", "modules", "appmodules.jimage"); 53 } 54 55 /** 56 * Returns the appropriate JDK home for this usage of the FileSystemProvider. 57 * When the CodeSource is null (null loader) then jrt:/ is the current runtime, 58 * otherwise the JDK home is located relative to jrt-fs.jar. 59 */ 60 private static String findHome() { 61 CodeSource cs = SystemImages.class.getProtectionDomain().getCodeSource(); 62 if (cs == null) 63 return System.getProperty("java.home"); 64 65 // assume loaded from $TARGETJDK/jrt-fs.jar 66 URL url = cs.getLocation(); 67 if (!url.getProtocol().equalsIgnoreCase("file")) 68 throw new RuntimeException(url + " loaded in unexpected way"); 69 try { 70 return Paths.get(url.toURI()).getParent().toString(); 71 } catch (URISyntaxException e) { 72 throw new InternalError(e); 73 } 74 } 75 }