author | alanb |
Sun, 15 Feb 2009 12:25:54 +0000 | |
changeset 2057 | 3acf8e5e2ca0 |
child 2072 | 80dfe4469bbd |
permissions | -rw-r--r-- |
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/* |
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* Copyright 2007-2009 Sun Microsystems, Inc. All Rights Reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Sun designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Sun in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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* CA 95054 USA or visit www.sun.com if you need additional information or |
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* have any questions. |
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*/ |
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package java.nio.file.attribute; |
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|
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import java.nio.file.*; |
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import java.util.List; |
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import java.io.IOException; |
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/** |
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* A file attribute view that supports reading or updating a file's Access |
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* Control Lists (ACL) or file owner attributes. |
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* |
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* <p> ACLs are used to specify access rights to file system objects. An ACL is |
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* an ordered list of {@link AclEntry access-control-entries}, each specifying a |
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* {@link UserPrincipal} and the level of access for that user principal. This |
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* file attribute view defines the {@link #getAcl() getAcl}, and {@link |
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* #setAcl(List) setAcl} methods to read and write ACLs based on the ACL |
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* model specified in <a href="http://www.ietf.org/rfc/rfc3530.txt"><i>RFC 3530: |
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* Network File System (NFS) version 4 Protocol</i></a>. This file attribute view |
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* is intended for file system implementations that support the NFSv4 ACL model |
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* or have a <em>well-defined</em> mapping between the NFSv4 ACL model and the ACL |
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* model used by the file system. The details of such mapping are implementation |
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* dependent and are therefore unspecified. |
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* |
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* <p> This class also extends {@code FileOwnerAttributeView} so as to define |
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* methods to get and set the file owner. |
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* |
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* <p> When a file system provides access to a set of {@link FileStore |
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* file-systems} that are not homogeneous then only some of the file systems may |
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* support ACLs. The {@link FileStore#supportsFileAttributeView |
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* supportsFileAttributeView} method can be used to test if a file system |
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* supports ACLs. |
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* |
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* <a name="interop"><h4>Interoperability</h4></a> |
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* |
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* RFC 3530 allows for special user identities to be used on platforms that |
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* support the POSIX defined access permissions. The special user identities |
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* are "{@code OWNER@}", "{@code GROUP@}", and "{@code EVERYONE@}". When both |
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* the {@code AclFileAttributeView} and the {@link PosixFileAttributeView} |
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* are supported then these special user identities may be included in ACL {@link |
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* AclEntry entries} that are read or written. The file system's {@link |
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* UserPrincipalLookupService} may be used to obtain a {@link UserPrincipal} |
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* to represent these special identities by invoking the {@link |
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* UserPrincipalLookupService#lookupPrincipalByName lookupPrincipalByName} |
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* method. |
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* |
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* <p> <b>Usage Example:</b> |
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* Suppose we wish to add an entry to an existing ACL to grant "joe" access: |
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* <pre> |
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* // lookup "joe" |
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* UserPrincipal joe = file.getFileSystem().getUserPrincipalLookupService() |
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* .lookupPrincipalByName("joe"); |
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* |
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* // get view |
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* AclFileAttributeView view = file.newFileAttributeView(AclFileAttributeView.class); |
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* |
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* // create ACE to give "joe" read access |
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* AclEntry entry = AclEntry.newBuilder() |
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* .setType(AclEntryType.ALLOW) |
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* .setPrincipal(joe) |
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* .setPermissions(AclEntryPermission.READ_DATA, AclEntryPermission.READ_ATTRIBUTES) |
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* .build(); |
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* |
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* // read ACL, insert ACE, re-write ACL |
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* List<AclEntry> acl = view.getAcl(); |
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* acl.add(0, entry); // insert before any DENY entries |
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* view.setAcl(acl); |
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* </pre> |
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* |
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* <h4> Dynamic Access </h4> |
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* <p> Where dynamic access to file attributes is required, the attributes |
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* supported by this attribute view are as follows: |
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* <blockquote> |
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* <table border="1" cellpadding="8"> |
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* <tr> |
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* <th> Name </th> |
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* <th> Type </th> |
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* </tr> |
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* <tr> |
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* <td> "acl" </td> |
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* <td> {@link List}<{@link AclEntry}> </td> |
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* </tr> |
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* <tr> |
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* <td> "owner" </td> |
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* <td> {@link UserPrincipal} </td> |
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* </tr> |
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* </table> |
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* </blockquote> |
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* |
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* <p> The {@link #getAttribute getAttribute} or {@link #readAttributes |
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* readAttributes} methods may be used to read the ACL or owner attributes as if |
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* by invoking the {@link #getAcl getAcl} or {@link #getOwner getOwner} methods. |
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* |
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* <p> The {@link #setAttribute setAttribute} method may be used to update the |
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* ACL or owner attributes as if by invoking the {@link #setAcl setAcl} or {@link |
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* #setOwner setOwner} methods. |
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* |
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* <h4> Setting the ACL when creating a file </h4> |
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* |
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* <p> Implementations supporting this attribute view may also support setting |
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* the initial ACL when creating a file or directory. The initial ACL |
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* may be provided to methods such as {@link Path#createFile createFile} or {@link |
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* Path#createDirectory createDirectory} as an {@link FileAttribute} with {@link |
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* FileAttribute#name name} {@code "acl:acl"} and a {@link FileAttribute#value |
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* value} that is the list of {@code AclEntry} objects. |
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* |
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* <p> Where an implementation supports an ACL model that differs from the NFSv4 |
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* defined ACL model then setting the initial ACL when creating the file must |
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* translate the ACL to the model supported by the file system. Methods that |
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* create a file should reject (by throwing {@link IOException IOException}) |
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* any attempt to create a file that would be less secure as a result of the |
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* translation. |
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* |
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* @since 1.7 |
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* @see Attributes#getAcl |
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* @see Attributes#setAcl |
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*/ |
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141 |
|
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public interface AclFileAttributeView |
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extends FileOwnerAttributeView |
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{ |
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145 |
/** |
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* Returns the name of the attribute view. Attribute views of this type |
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* have the name {@code "acl"}. |
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*/ |
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@Override |
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String name(); |
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|
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152 |
/** |
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* Reads the access control list. |
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* |
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* <p> When the file system uses an ACL model that differs from the NFSv4 |
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* defined ACL model, then this method returns an ACL that is the translation |
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* of the ACL to the NFSv4 ACL model. |
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* |
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* <p> The returned list is modifiable so as to facilitate changes to the |
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* existing ACL. The {@link #setAcl setAcl} method is used to update |
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* the file's ACL attribute. |
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* |
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* @return An ordered list of {@link AclEntry entries} representing the |
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* ACL |
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* |
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* @throws IOException |
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* If an I/O error occurs |
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* @throws SecurityException |
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* In the case of the default provider, a security manager is |
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* installed, and it denies {@link RuntimePermission}<tt>("accessUserInformation")</tt> |
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* or its {@link SecurityManager#checkRead(String) checkRead} method |
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* denies read access to the file. |
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*/ |
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List<AclEntry> getAcl() throws IOException; |
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175 |
|
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176 |
/** |
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* Updates (replace) the access control list. |
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* |
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* <p> Where the file system supports Access Control Lists, and it uses an |
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* ACL model that differs from the NFSv4 defined ACL model, then this method |
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* must translate the ACL to the model supported by the file system. This |
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* method should reject (by throwing {@link IOException IOException}) any |
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* attempt to write an ACL that would appear to make the file more secure |
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* than would be the case if the ACL were updated. Where an implementation |
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* does not support a mapping of {@link AclEntryType#AUDIT} or {@link |
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* AclEntryType#ALARM} entries, then this method ignores these entries when |
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* writing the ACL. |
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* |
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* <p> If an ACL entry contains a {@link AclEntry#principal user-principal} |
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* that is not associated with the same provider as this attribute view then |
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* {@link ProviderMismatchException} is thrown. Additional validation, if |
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* any, is implementation dependent. |
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* |
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* <p> If the file system supports other security related file attributes |
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* (such as a file {@link PosixFileAttributes#permissions |
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* access-permissions} for example), the updating the access control list |
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* may also cause these security related attributes to be updated. |
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* |
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* @param acl |
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* The new access control list |
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* |
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* @throws IOException |
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* If an I/O error occurs or the ACL is invalid |
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* @throws SecurityException |
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* In the case of the default provider, a security manager is |
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* installed, it denies {@link RuntimePermission}<tt>("accessUserInformation")</tt> |
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* or its {@link SecurityManager#checkWrite(String) checkWrite} |
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* method denies write access to the file. |
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*/ |
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void setAcl(List<AclEntry> acl) throws IOException; |
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} |