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3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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13  * accompanied this code).
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22  */
23 
24 /* @test
25  * @bug 4313887 6865748
26  * @summary Unit test for java.nio.file.Files.walkFileTree
27  */
28 
29 import java.nio.file.*;
30 import java.nio.file.attribute.BasicFileAttributes;
31 import java.io.IOException;
32 import java.util.*;
33 
34 public class Nulls {
35 
npeExpected()36     static void npeExpected() {
37         throw new RuntimeException("NullPointerException expected");
38     }
39 
main(String[] args)40     public static void main(String[] args) throws IOException {
41         try {
42             Files.walkFileTree(null, EnumSet.noneOf(FileVisitOption.class),
43                 Integer.MAX_VALUE, new SimpleFileVisitor<Path>(){});
44             npeExpected();
45         } catch (NullPointerException e) {
46         }
47         try {
48             Files.walkFileTree(Paths.get("."), null, Integer.MAX_VALUE,
49                 new SimpleFileVisitor<Path>(){});
50             npeExpected();
51         } catch (NullPointerException e) {
52         }
53         try {
54             Files.walkFileTree(Paths.get("."), EnumSet.noneOf(FileVisitOption.class),
55                 -1, new SimpleFileVisitor<Path>(){});
56             throw new RuntimeException("IllegalArgumentExpected expected");
57         } catch (IllegalArgumentException e) {
58         }
59         try {
60             Set<FileVisitOption> opts = new HashSet<>(1);
61             opts.add(null);
62             Files.walkFileTree(Paths.get("."), opts, Integer.MAX_VALUE,
63                 new SimpleFileVisitor<Path>(){});
64             npeExpected();
65         } catch (NullPointerException e) {
66         }
67         try {
68             Files.walkFileTree(Paths.get("."), EnumSet.noneOf(FileVisitOption.class),
69                 Integer.MAX_VALUE, null);
70             npeExpected();
71         } catch (NullPointerException e) {
72         }
73 
74         SimpleFileVisitor<Path> visitor = new SimpleFileVisitor<Path>() { };
75         boolean ranTheGauntlet = false;
76         Path dir = Paths.get(".");
77         BasicFileAttributes attrs = Files.readAttributes(dir, BasicFileAttributes.class);
78 
79         try { visitor.preVisitDirectory(null, attrs);
80         } catch (NullPointerException x0) {
81         try { visitor.preVisitDirectory(dir, null);
82         } catch (NullPointerException x1) {
83         try { visitor.visitFile(null, attrs);
84         } catch (NullPointerException x2) {
85         try {  visitor.visitFile(dir, null);
86         } catch (NullPointerException x3) {
87         try { visitor.visitFileFailed(null, new IOException());
88         } catch (NullPointerException x4) {
89         try { visitor.visitFileFailed(dir, null);
90         } catch (NullPointerException x5) {
91         try { visitor.postVisitDirectory(null, new IOException());
92         } catch (NullPointerException x6) {
93             // if we get here then all visit* methods threw NPE as expected
94             ranTheGauntlet = true;
95         }}}}}}}
96         if (!ranTheGauntlet)
97             throw new RuntimeException("A visit method did not throw NPE");
98     }
99 }
100