/*
 * Copyright 2007-2009 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

package java.nio.file.attribute;

import java.util.Set;

/**
 * File attributes associated with files on file systems used by operating systems
 * that implement the Portable Operating System Interface (POSIX) family of
 * standards.
 *
 * <p> The POSIX attributes of a file are retrieved using a {@link
 * PosixFileAttributeView} by invoking its {@link
 * PosixFileAttributeView#readAttributes readAttributes} method.
 *
 * @since 1.7
 *
 * @see Attributes#readPosixFileAttributes
 */

public interface PosixFileAttributes
    extends BasicFileAttributes
{
    /**
     * Returns the owner of the file.
     *
     * @return  The file owner
     *
     * @see PosixFileAttributeView#setOwner
     */
    UserPrincipal owner();

    /**
     * Returns the group owner of the file.
     *
     * @return  The file group owner
     *
     * @see PosixFileAttributeView#setGroup
     */
    GroupPrincipal group();

    /**
     * Returns the permissions of the file. The file permissions are returned
     * as a set of {@link PosixFilePermission} elements. The returned set is a
     * copy of the file permissions and is modifiable. This allows the result
     * to be modified and passed to the {@link PosixFileAttributeView#setPermissions
     * setPermissions} method to update the file's permissions.
     *
     * @return  The file permissions
     *
     * @see PosixFileAttributeView#setPermissions
     */
    Set<PosixFilePermission> permissions();
}