1 /*
 2  * Copyright (c) 2025, 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
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17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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20  * or visit www.oracle.com if you need additional information or have any
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22  */
23 
24 import jdk.internal.jimage.ImageReader;
25 
26 import java.nio.file.Files;
27 import java.nio.file.Path;
28 import java.nio.file.Paths;
29 import java.util.HashSet;
30 import java.util.List;
31 import java.util.Set;
32 
33 /**
34  * @test
35  * @bug 8247407
36  * @summary Test that ImageReader doesn't create a Directory node with duplicate children
37  * @modules java.base/jdk.internal.jimage
38  * @run main ImageReaderDuplicateChildNodesTest
39  */
40 public class ImageReaderDuplicateChildNodesTest {
41 
42     /**
43      * Uses the ImageReader to open and read the JAVA_HOME/lib/modules image. Tests that the
44      * {@link ImageReader#findNode(String)} corresponding to a directory doesn't return a node
45      * with duplicate children in it.
46      */
47     public static void main(final String[] args) throws Exception {
48         final Path imagePath = Paths.get(System.getProperty("java.home"), "lib", "modules");
49         if (!Files.exists(imagePath)) {
50             // skip the testing in the absence of the image file
51             System.err.println("Skipping test since " + imagePath + " is absent");
52             return;
53         }
54         System.out.println("Running test against image " + imagePath);
55         final String integersParentResource = "/modules/java.base/java/lang";
56         final String integerResource = integersParentResource + "/Integer.class";
57         try (final ImageReader reader = ImageReader.open(imagePath)) {
58             // find the child node/resource first
59             final ImageReader.Node integerNode = reader.findNode(integerResource);
60             if (integerNode == null) {
61                 throw new RuntimeException("ImageReader could not locate " + integerResource
62                         + " in " + imagePath);
63             }
64             // now find the parent node (which will represent a directory)
65             final ImageReader.Node parent = reader.findNode(integersParentResource);
66             if (parent == null) {
67                 throw new RuntimeException("ImageReader could not locate " + integersParentResource
68                         + " in " + imagePath);
69             }
70             // now verify that the parent node which is a directory, doesn't have duplicate children
71             final List<String> childNames = parent.getChildNames().toList();
72             if (childNames.isEmpty()) {
73                 throw new RuntimeException("ImageReader did not return any child resources under "
74                         + integersParentResource + " in " + imagePath);
75             }
76             final Set<ImageReader.Node> uniqueChildren = new HashSet<>();
77             for (final String childName : childNames) {
78                 final boolean unique = uniqueChildren.add(reader.findNode(childName));
79                 if (!unique) {
80                     throw new RuntimeException("ImageReader returned duplicate child resource "
81                             + childName + " under " + parent + " from image " + imagePath);
82                 }
83             }
84         }
85     }
86 }