1 /*
 2  * Copyright (c) 2022, 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
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
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22  */
23 
24 import jdk.internal.jimage.ImageReader;
25 import jdk.internal.jimage.PreviewMode;
26 
27 import java.nio.file.Files;
28 import java.nio.file.Path;
29 import java.nio.file.Paths;
30 import java.util.HashSet;
31 import java.util.List;
32 import java.util.Set;
33 
34 /**
35  * @test
36  * @bug 8247407
37  * @summary Test that ImageReader doesn't create a Directory node with duplicate children
38  * @modules java.base/jdk.internal.jimage
39  * @run main ImageReaderDuplicateChildNodesTest
40  */
41 public class ImageReaderDuplicateChildNodesTest {
42 
43     /**
44      * Uses the ImageReader to open and read the JAVA_HOME/lib/modules image. Tests that the
45      * {@link ImageReader#findNode(String)} corresponding to a directory doesn't return a node
46      * with duplicate children in it.
47      */
48     public static void main(final String[] args) throws Exception {
49         final Path imagePath = Paths.get(System.getProperty("java.home"), "lib", "modules");
50         if (!Files.exists(imagePath)) {
51             // skip the testing in the absence of the image file
52             System.err.println("Skipping test since " + imagePath + " is absent");
53             return;
54         }
55         System.out.println("Running test against image " + imagePath);
56         final String integersParentResource = "/modules/java.base/java/lang";
57         final String integerResource = integersParentResource + "/Integer.class";
58         try (final ImageReader reader = ImageReader.open(imagePath, PreviewMode.DISABLED)) {
59             // find the child node/resource first
60             final ImageReader.Node integerNode = reader.findNode(integerResource);
61             if (integerNode == null) {
62                 throw new RuntimeException("ImageReader could not locate " + integerResource
63                         + " in " + imagePath);
64             }
65             // now find the parent node (which will represent a directory)
66             final ImageReader.Node parent = reader.findNode(integersParentResource);
67             if (parent == null) {
68                 throw new RuntimeException("ImageReader could not locate " + integersParentResource
69                         + " in " + imagePath);
70             }
71             // now verify that the parent node which is a directory, doesn't have duplicate children
72             final List<String> childNames = parent.getChildNames().toList();
73             if (childNames.isEmpty()) {
74                 throw new RuntimeException("ImageReader did not return any child resources under "
75                         + integersParentResource + " in " + imagePath);
76             }
77             final Set<ImageReader.Node> uniqueChildren = new HashSet<>();
78             for (final String childName : childNames) {
79                 final boolean unique = uniqueChildren.add(reader.findNode(childName));
80                 if (!unique) {
81                     throw new RuntimeException("ImageReader returned duplicate child resource "
82                             + childName + " under " + parent + " from image " + imagePath);
83                 }
84             }
85         }
86     }
87 }