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   * Copyright (c) 2007, 2011, Oracle and/or its affiliates. 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.  Oracle designates this
   * particular file as subject to the "Classpath" exception as provided
   * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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   */
  
  package java.nio.file.attribute;
  
  import java.io.IOException;
  
  /**
   * A file attribute view that supports reading or updating the owner of a file.
   * This file attribute view is intended for file system implementations that
   * support a file attribute that represents an identity that is the owner of
   * the file. Often the owner of a file is the identity of the entity that
   * created the file.
   *
   * <p> The {@link #getOwner getOwner} or {@link #setOwner setOwner} methods may
   * be used to read or update the owner of the file.
   *
   * <p> The {@link java.nio.file.Files#getAttribute getAttribute} and
   * {@link java.nio.file.Files#setAttribute setAttribute} methods may also be
   * used to read or update the owner. In that case, the owner attribute is
   * identified by the name {@code "owner"}, and the value of the attribute is
   * a {@link UserPrincipal}.
   *
   * @since 1.7
   */
  
  public interface FileOwnerAttributeView
      extends FileAttributeView
  {
      /**
       * Returns the name of the attribute view. Attribute views of this type
       * have the name {@code "owner"}.
       */
      @Override
      String name();
  
      /**
       * Read the file owner.
       *
       * <p> It it implementation specific if the file owner can be a {@link
       * GroupPrincipal group}.
       *
       * @return  the file owner
       *
       * @throws  IOException
       *          if an I/O error occurs
       * @throws  SecurityException
       *          In the case of the default provider, a security manager is
       *          installed, and it denies {@link
       *          RuntimePermission}<tt>("accessUserInformation")</tt> or its
       *          {@link SecurityManager#checkRead(String) checkRead} method
       *          denies read access to the file.
       */
      UserPrincipal getOwner() throws IOException;
  
      /**
       * Updates the file owner.
       *
       * <p> It it implementation specific if the file owner can be a {@link
       * GroupPrincipal group}. To ensure consistent and correct behavior
       * across platforms it is recommended that this method should only be used
       * to set the file owner to a user principal that is not a group.
       *
       * @param   owner
       *          the new file owner
       *
       * @throws  IOException
       *          if an I/O error occurs, or the {@code owner} parameter is a
       *          group and this implementation does not support setting the owner
       *          to a group
       * @throws  SecurityException
       *          In the case of the default provider, a security manager is
       *          installed, and it denies {@link
       *          RuntimePermission}<tt>("accessUserInformation")</tt> or its
       *          {@link SecurityManager#checkWrite(String) checkWrite} method
       *          denies write access to the file.
       */
      void setOwner(UserPrincipal owner) throws IOException;
  }
  