1 /* 2 * Copyright (c) 2016, 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. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 import java.io.IOException; 25 import java.net.URI; 26 import java.net.URL; 27 import java.net.URLClassLoader; 28 import java.nio.file.FileSystem; 29 import java.nio.file.FileSystems; 30 import java.nio.file.Files; 31 import java.nio.file.Path; 32 import java.nio.file.Paths; 33 import java.util.Collections; 34 import java.util.stream.Stream; 35 36 /** 37 * Basic jrt file system functionality testing 38 * 39 */ 40 public class Main { 41 42 public static void main(String[] args) throws Exception { 43 String javaHome = args[0]; 44 FileSystem fs = null; 45 boolean isInstalled = false; 46 if (args.length == 2) { 47 fs = createFsByInstalledProvider(); 48 isInstalled = true; 49 } else { 50 fs = createFsWithURLClassloader(javaHome); 51 } 52 53 Path mods = fs.getPath("/modules"); 54 try (Stream<Path> stream = Files.walk(mods)) { 55 stream.forEach(path -> { 56 path.getFileName(); 57 }); 58 } finally { 59 try { 60 fs.close(); 61 } catch (UnsupportedOperationException e) { 62 if (!isInstalled) { 63 throw new RuntimeException( 64 "UnsupportedOperationException is thrown unexpectedly"); 65 } 66 } 67 } 68 } 69 70 private static FileSystem createFsWithURLClassloader(String javaHome) throws IOException{ 71 URL url = Paths.get(javaHome, "jrt-fs.jar").toUri().toURL(); 72 URLClassLoader loader = new URLClassLoader(new URL[] { url }); 73 return FileSystems.newFileSystem(URI.create("jrt:/"), 74 Collections.emptyMap(), 75 loader); 76 } 77 78 private static FileSystem createFsByInstalledProvider() throws IOException { 79 return FileSystems.getFileSystem(URI.create("jrt:/")); 80 } 81 } 82