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.Set; |
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import java.io.IOException; |
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/** |
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* A file attribute view that provides a view of the file attributes commonly |
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* associated with files on file systems used by operating systems that implement |
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* the Portable Operating System Interface (POSIX) family of standards. |
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* |
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* <p> Operating systems that implement the <a href="http://www.opengroup.org"> |
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* POSIX</a> family of standards commonly use file systems that have a |
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* file <em>owner</em>, <em>group-owner</em>, and related <em>access |
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* permissions</em>. This file attribute view provides read and write access |
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* to these attributes. |
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* |
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* <p> The {@link #readAttributes() readAttributes} method is used to read the |
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* file's attributes. The file {@link PosixFileAttributes#owner() owner} is |
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* represented by a {@link UserPrincipal} that is the identity of the file owner |
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* for the purposes of access control. The {@link PosixFileAttributes#group() |
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* group-owner}, represented by a {@link GroupPrincipal}, is the identity of the |
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* group owner, where a group is an identity created for administrative purposes |
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* so as to determine the access rights for the members of the group. |
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* |
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* <p> The {@link PosixFileAttributes#permissions() permissions} attribute is a |
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* set of access permissions. This file attribute view provides access to the nine |
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* permission defined by the {@link PosixFilePermission} class. |
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* These nine permission bits determine the <em>read</em>, <em>write</em>, and |
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* <em>execute</em> access for the file owner, group, and others (others |
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* meaning identities other than the owner and members of the group). Some |
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* operating systems and file systems may provide additional permission bits |
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* but access to these other bits is not defined by this class in this release. |
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* |
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* <p> <b>Usage Example:</b> |
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* Suppose we need to print out the owner and access permissions of a file: |
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* <pre> |
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* FileRef file = ... |
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* PosixFileAttributes attrs = file.newFileAttributeView(PosixFileAttributeView.class) |
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* .readAttributes(); |
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* System.out.format("%s %s%n", |
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* attrs.owner().getName(), |
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* PosixFilePermissions.toString(attrs.permissions())); |
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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 defined by {@link |
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* BasicFileAttributeView} and {@link FileOwnerAttributeView}, and in addition, |
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* the following attributes are supported: |
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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> "permissions" </td> |
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* <td> {@link Set}<{@link PosixFilePermission}> </td> |
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* </tr> |
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* <tr> |
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* <td> "group" </td> |
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* <td> {@link GroupPrincipal} </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 |
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* #readAttributes(String,String[]) readAttributes(String,String[])} methods may |
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* be used to read any of these attributes, or any of the attributes defined by |
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* {@link BasicFileAttributeView} as if by invoking the {@link #readAttributes |
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* readAttributes()} method. |
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* |
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* <p> The {@link #setAttribute setAttribute} method may be used to update the |
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* file's last modified time, last access time or create time attributes as |
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* defined by {@link BasicFileAttributeView}. It may also be used to update |
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* the permissions, owner, or group-owner as if by invoking the {@link |
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* #setPermissions setPermissions}, {@link #setOwner setOwner}, and {@link |
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* #setGroup setGroup} methods respectively. |
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* |
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* <h4> Setting Initial Permissions </h4> |
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* <p> Implementations supporting this attribute view may also support setting |
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* the initial permissions when creating a file or directory. The |
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* initial permissions are provided to the {@link Path#createFile createFile} |
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* or {@link Path#createDirectory createDirectory} methods as a {@link |
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* FileAttribute} with {@link FileAttribute#name name} {@code "posix:permissions"} |
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* and a {@link FileAttribute#value value} that is the set of permissions. The |
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* following example uses the {@link PosixFilePermissions#asFileAttribute |
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* asFileAttribute} method to construct a {@code FileAttribute} when creating a |
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* file: |
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* |
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* <pre> |
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* Path path = ... |
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* Set<PosixFilePermission> perms = |
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* EnumSet.of(OWNER_READ, OWNER_WRITE, OWNER_EXECUTE, GROUP_READ); |
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* path.createFile(PosixFilePermissions.asFileAttribute(perms)); |
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* </pre> |
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* |
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* <p> When the access permissions are set at file creation time then the actual |
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* value of the permissions may differ that the value of the attribute object. |
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* The reasons for this are implementation specific. On UNIX systems, for |
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* example, a process has a <em>umask</em> that impacts the permission bits |
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* of newly created files. Where an implementation supports the setting of |
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* the access permissions, and the underlying file system supports access |
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* permissions, then it is required that the value of the actual access |
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* permissions will be equal or less than the value of the attribute |
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* provided to the {@link java.nio.file.Path#createFile createFile} or |
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* {@link java.nio.file.Path#createDirectory createDirectory} methods. In |
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* other words, the file may be more secure than requested. |
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* |
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* @since 1.7 |
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* |
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* @see Attributes#readPosixFileAttributes |
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*/ |
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|
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public interface PosixFileAttributeView |
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extends BasicFileAttributeView, FileOwnerAttributeView |
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{ |
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/** |
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* Returns the name of the attribute view. Attribute views of this type |
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* have the name {@code "posix"}. |
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*/ |
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@Override |
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String name(); |
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|
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/** |
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* @throws IOException {@inheritDoc} |
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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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@Override |
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PosixFileAttributes readAttributes() throws IOException; |
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161 |
|
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162 |
/** |
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* Updates the file permissions. |
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* |
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* @param perms |
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* The new set of permissions |
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* |
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* @throws ClassCastException |
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* If the sets contains elements that are not of type {@code |
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* PosixFilePermission} |
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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#checkWrite(String) checkWrite} |
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* method denies write access to the file. |
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*/ |
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void setPermissions(Set<PosixFilePermission> perms) throws IOException; |
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|
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/** |
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* Updates the file group-owner. |
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* |
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* @param group |
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* The new file group-owner |
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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, and 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 setGroup(GroupPrincipal group) throws IOException; |
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} |