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* Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
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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;
}