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25 
26 package java.nio.file.attribute;
27 
28 import java.util.Set;
29 
30 /**
31  * File attributes associated with files on file systems used by operating systems
32  * that implement the Portable Operating System Interface (POSIX) family of
33  * standards.
34  *
35  * <p> The POSIX attributes of a file are retrieved using a {@link
36  * PosixFileAttributeView} by invoking its {@link
37  * PosixFileAttributeView#readAttributes readAttributes} method.
38  *
39  * @since 1.7
40  */
41 
42 public interface PosixFileAttributes
43     extends BasicFileAttributes
44 {
45     /**
46      * Returns the owner of the file.
47      *
48      * @return  the file owner
49      *
50      * @see PosixFileAttributeView#setOwner
51      */
owner()52     UserPrincipal owner();
53 
54     /**
55      * Returns the group owner of the file.
56      *
57      * @return  the file group owner
58      *
59      * @see PosixFileAttributeView#setGroup
60      */
group()61     GroupPrincipal group();
62 
63     /**
64      * Returns the permissions of the file. The file permissions are returned
65      * as a set of {@link PosixFilePermission} elements. The returned set is a
66      * copy of the file permissions and is modifiable. This allows the result
67      * to be modified and passed to the {@link PosixFileAttributeView#setPermissions
68      * setPermissions} method to update the file's permissions.
69      *
70      * @return  the file permissions
71      *
72      * @see PosixFileAttributeView#setPermissions
73      */
permissions()74     Set<PosixFilePermission> permissions();
75 }
76