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