Examples of java.nio.file.attribute.BasicFileAttributes.fileKey()

Class java.nio.file.attribute.BasicFileAttributes

Examples of java.nio.file.attribute.BasicFileAttributes.fileKey()

java.nio.file.attribute.BasicFileAttributes.fileKey()
Returns an object that uniquely identifies the given file, or {@code null} if a file key is not available. On some platforms or file systemsit is possible to use an identifier, or a combination of identifiers to uniquely identify a file. Such identifiers are important for operations such as file tree traversal in file systems that support symbolic links or file systems that allow a file to be an entry in more than one directory. On UNIX file systems, for example, the device ID and inode are commonly used for such purposes.
The file key returned by this method can only be guaranteed to be unique if the file system and files remain static. Whether a file system re-uses identifiers after a file is deleted is implementation dependent and therefore unspecified.
File keys returned by this method can be compared for equality and are suitable for use in collections. If the file system and files remain static, and two files are the {@link java.nio.file.Files#isSameFile same} withnon- {@code null} file keys, then their file keys are equal. @return an object that uniquely identifies the given file, or {@code null} @see java.nio.file.Files#walkFileTree

        if (depth >= maxDepth || !attrs.isDirectory()) {
            return new Event(EventType.ENTRY, entry, attrs);
        }


        // check for cycles when following links
        if (followLinks && wouldLoop(entry, attrs.fileKey())) {
            return new Event(EventType.ENTRY, entry,
                             new FileSystemLoopException(entry.toString()));
        }


        // file is a directory, attempt to open it

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                return null;
            throw se;
        }


        // push a directory node to the stack and return an event
        stack.push(new DirectoryNode(entry, attrs.fileKey(), stream));
        return new Event(EventType.START_DIRECTORY, entry, attrs);
    }




    /**

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    System.out.printf(">>> Directory? %s\n", basicAttributes.isDirectory());
    System.out.printf(">>> File? %s\n", basicAttributes.isRegularFile());
    System.out.printf(">>> Last accessed on: %s\n", basicAttributes.lastAccessTime());
    System.out.printf(">>> Last modified on: %s\n", basicAttributes.lastModifiedTime());
    System.out.printf(">>> File size (bytes): %s\n", basicAttributes.size());
    System.out.printf(">>> File key : %s\n", basicAttributes.fileKey());
    File tempDir = new File(System.getProperty("java.io.tmpdir"));
    Path tempDirPathRef = Paths.get(tempDir.toURI());
    Path p = null;
    Iterator<Path> tmpIter = null;
    System.out.printf("Files in directory '%s'\n", tempDir.getName());

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  public void testReadAttributes_asObject() {
    File file = Directory.create(0);
    service.setInitialAttributes(file);


    BasicFileAttributes basicAttrs = service.readAttributes(file, BasicFileAttributes.class);
    assertThat(basicAttrs.fileKey()).isEqualTo(0);
    assertThat(basicAttrs.isDirectory()).isTrue();
    assertThat(basicAttrs.isRegularFile()).isFalse();


    TestAttributes testAttrs = service.readAttributes(file, TestAttributes.class);
    assertThat(testAttrs.foo()).isEqualTo("hello");

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    assertThat(view).isNotNull();
    assertThat(view.name()).isEqualTo("basic");


    BasicFileAttributes attrs = view.readAttributes();
    assertThat(attrs.fileKey()).isEqualTo(0);


    FileTime time = attrs.creationTime();
    assertThat(attrs.lastAccessTime()).isEqualTo(time);
    assertThat(attrs.lastModifiedTime()).isEqualTo(time);

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  }


  @Test
  public void testAttributes() {
    BasicFileAttributes attrs = provider.readAttributes(file);
    assertThat(attrs.fileKey()).isEqualTo(0);
    assertThat(attrs.isDirectory()).isTrue();
    assertThat(attrs.isRegularFile()).isFalse();
    assertThat(attrs.creationTime()).isNotNull();
  }
}

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