1 /*
   2  * Copyright (c) 2010, 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.nio.file.*;
  25 import java.nio.file.attribute.*;
  26 import java.io.IOException;
  27 import java.util.*;
  28 
  29 /**
  30  * Unit test for Files.walkFileTree to test maxDepth parameter
  31  */
  32 
  33 public class MaxDepth {
  34     public static void main(String[] args) throws Exception {
  35         final Path top = Paths.get(args[0]);
  36 
  37         for (int i=0; i<5; i++) {
  38             Set<FileVisitOption> opts = Collections.emptySet();
  39             final int maxDepth = i;
  40             Files.walkFileTree(top, opts, maxDepth, new SimpleFileVisitor<Path>() {
  41                 // compute depth based on relative path to top directory
  42                 private int depth(Path file) {
  43                     Path rp = file.relativize(top);
  44                     return (rp == null) ? 0 : rp.getNameCount();
  45                 }
  46 
  47                 @Override
  48                 public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) {
  49                     int d = depth(dir);
  50                     if (d == maxDepth)
  51                         throw new RuntimeException("Should not open directories at maxDepth");
  52                     if (d > maxDepth)
  53                         throw new RuntimeException("Too deep");
  54                     return FileVisitResult.CONTINUE;
  55                 }
  56 
  57                 @Override
  58                 public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) {
  59                     int d = depth(file);
  60                     if (d > maxDepth)
  61                         throw new RuntimeException("Too deep");
  62                     return FileVisitResult.CONTINUE;
  63                 }
  64             });
  65         }
  66     }
  67 }