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 "Classname" 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; |
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|
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import java.nio.file.attribute.*; |
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import java.nio.channels.SeekableByteChannel; |
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import java.util.Set; |
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import java.io.IOException; |
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|
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/** |
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* A {@code DirectoryStream} that defines operations on files that are located |
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* relative to an open directory. A {@code SecureDirectoryStream} is intended |
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* for use by sophisticated or security sensitive applications requiring to |
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* traverse file trees or otherwise operate on directories in a race-free manner. |
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* Race conditions can arise when a sequence of file operations cannot be |
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* carried out in isolation. Each of the file operations defined by this |
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* interface specify a relative {@link Path}. All access to the file is relative |
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* to the open directory irrespective of if the directory is moved or replaced |
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* by an attacker while the directory is open. A {@code SecureDirectoryStream} |
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* may also be used as a virtual <em>working directory</em>. |
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* |
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* <p> A {@code SecureDirectoryStream} requires corresponding support from the |
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* underlying operating system. Where an implementation supports this features |
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* then the {@code DirectoryStream} returned by the {@link Path#newDirectoryStream |
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* newDirectoryStream} method will be a {@code SecureDirectoryStream} and must |
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* be cast to that type in order to invoke the methods defined by this interface. |
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* |
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* <p> As specified by {@code DirectoryStream}, the iterator's {@link |
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* java.util.Iterator#remove() remove} method removes the directory entry for |
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* the last element returned by the iterator. In the case of a {@code |
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* SecureDirectoryStream} the {@code remove} method behaves as if by invoking |
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* the {@link #deleteFile deleteFile} or {@link #deleteDirectory deleteDirectory} |
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* methods defined by this interface. The {@code remove} may require to examine |
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* the file to determine if the file is a directory, and consequently, it may |
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* not be atomic with respect to other file system operations. |
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* |
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* <p> In the case of the default {@link java.nio.file.spi.FileSystemProvider |
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* provider}, and a security manager is set, then the permission checks are |
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* performed using the path obtained by resolving the given relative path |
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* against the <i>original path</i> of the directory (irrespective of if the |
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* directory is moved since it was opened). |
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* |
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* @since 1.7 |
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*/ |
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|
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public abstract class SecureDirectoryStream |
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implements DirectoryStream<Path> |
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{ |
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/** |
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* Initialize a new instance of this class. |
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*/ |
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protected SecureDirectoryStream() { } |
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|
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/** |
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* Opens the directory identified by the given path, returning a {@code |
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* SecureDirectoryStream} to iterate over the entries in the directory. |
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* |
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* <p> This method works in exactly the manner specified by the {@link |
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* Path#newDirectoryStream newDirectoryStream} method for the case that |
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* the {@code path} parameter is an {@link Path#isAbsolute absolute} path. |
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* When the parameter is a relative path then the directory to open is |
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* relative to this open directory. The {@code followLinks} parameter |
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* determines if links should be followed. If this parameter is {@code |
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* false} and the file is a symbolic link then this method fails (by |
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* throwing an I/O exception). |
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* |
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* <p> The new directory stream, once created, is not dependent upon the |
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* directory stream used to create it. Closing this directory stream has no |
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* effect upon newly created directory stream. |
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* |
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* @param path |
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* The path to the directory to open |
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* @param followLinks |
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* {@code true} if the links should be followed |
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* @param filter |
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* The directory stream filter or {@code null}. |
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* |
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* @return A new and open {@code SecureDirectoryStream} object |
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* |
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* @throws ClosedDirectoryStreamException |
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* If the directory stream is closed |
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* @throws NotDirectoryException |
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* If the file could not otherwise be opened because it is not |
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* a directory <i>(optional specific exception)</i> |
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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, the {@link SecurityManager#checkRead(String) checkRead} |
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* method is invoked to check read access to the directory. |
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*/ |
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public abstract SecureDirectoryStream newDirectoryStream(Path path, |
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boolean followLinks, |
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DirectoryStream.Filter<? super Path> filter) |
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throws IOException; |
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|
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/** |
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* Opens or creates a file in this directory, returning a seekable byte |
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* channel to access the file. |
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* |
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* <p> This method works in exactly the manner specified by the {@link |
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* Path#newByteChannel Path.newByteChannel} method for the |
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* case that the {@code path} parameter is an {@link Path#isAbsolute absolute} |
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* path. When the parameter is a relative path then the file to open or |
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* create is relative to this open directory. In addition to the options |
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* defined by the {@code Path.newByteChannel} method, the {@link |
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* LinkOption#NOFOLLOW_LINKS NOFOLLOW_LINKS} option may be used to |
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* ensure that this method fails if the file is a symbolic link. |
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* |
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* <p> The channel, once created, is not dependent upon the directory stream |
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* used to create it. Closing this directory stream has no effect upon the |
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* channel. |
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* |
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* @param path |
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* The path of the file to open open or create |
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* @param options |
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* Options specifying how the file is opened |
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* @param attrs |
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* An optional list of attributes to set atomically when creating |
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* the file |
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* |
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* @throws ClosedDirectoryStreamException |
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* If the directory stream is closed |
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* @throws IllegalArgumentException |
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* If the set contains an invalid combination of options |
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* @throws UnsupportedOperationException |
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* If an unsupported open option is specified or the array contains |
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* attributes that cannot be set atomically when creating the file |
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* @throws FileAlreadyExistsException |
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* If a file of that name already exists and the {@link |
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* StandardOpenOption#CREATE_NEW CREATE_NEW} option is specified |
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* <i>(optional specific exception)</i> |
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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, the {@link SecurityManager#checkRead(String) checkRead} |
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* method is invoked to check read access to the path if the file |
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* is opened for reading. The {@link SecurityManager#checkWrite(String) |
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* checkWrite} method is invoked to check write access to the path |
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* if the file is opened for writing. |
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*/ |
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public abstract SeekableByteChannel newByteChannel(Path path, |
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Set<? extends OpenOption> options, |
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FileAttribute<?>... attrs) |
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throws IOException; |
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169 |
|
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170 |
/** |
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* Deletes a file. |
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* |
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* <p> Unlike the {@link FileRef#delete delete()} method, this method |
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* does not first examine the file to determine if the file is a directory. |
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* Whether a directory is deleted by this method is system dependent and |
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* therefore not specified. If the file is a symbolic-link then the link is |
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* deleted (not the final target of the link). When the parameter is a |
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* relative path then the file to delete is relative to this open directory. |
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* |
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* @param path |
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* The path of the file to delete |
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* |
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* @throws ClosedDirectoryStreamException |
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* If the directory stream is closed |
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* @throws NoSuchFileException |
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* If the the file does not exist <i>(optional specific exception)</i> |
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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, the {@link SecurityManager#checkDelete(String) checkDelete} |
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* method is invoked to check delete access to the file |
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*/ |
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public abstract void deleteFile(Path path) throws IOException; |
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195 |
|
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196 |
/** |
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* Deletes a directory. |
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* |
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* <p> Unlike the {@link FileRef#delete delete()} method, this method |
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* does not first examine the file to determine if the file is a directory. |
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* Whether non-directories are deleted by this method is system dependent and |
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* therefore not specified. When the parameter is a relative path then the |
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* directory to delete is relative to this open directory. |
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204 |
* |
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* @param path |
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* The path of the directory to delete |
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* |
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* @throws ClosedDirectoryStreamException |
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* If the directory stream is closed |
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* @throws NoSuchFileException |
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* If the the directory does not exist <i>(optional specific exception)</i> |
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* @throws DirectoryNotEmptyException |
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* If the directory could not otherwise be deleted because it is |
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* not empty <i>(optional specific exception)</i> |
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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, the {@link SecurityManager#checkDelete(String) checkDelete} |
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* method is invoked to check delete access to the directory |
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*/ |
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public abstract void deleteDirectory(Path path) throws IOException; |
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223 |
|
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224 |
/** |
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* Move a file from this directory to another directory. |
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* |
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* <p> This method works in a similar manner to {@link Path#moveTo moveTo} |
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* method when the {@link StandardCopyOption#ATOMIC_MOVE ATOMIC_MOVE} option |
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* is specified. That is, this method moves a file as an atomic file system |
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* operation. If the {@code srcpath} parameter is an {@link Path#isAbsolute |
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* absolute} path then it locates the source file. If the parameter is a |
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* relative path then it is located relative to this open directory. If |
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* the {@code targetpath} parameter is absolute then it locates the target |
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* file (the {@code targetdir} parameter is ignored). If the parameter is |
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* a relative path it is located relative to the open directory identified |
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* by the {@code targetdir} parameter. In all cases, if the target file |
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* exists then it is implementation specific if it is replaced or this |
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* method fails. |
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* |
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* @param srcpath |
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* The name of the file to move |
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* @param targetdir |
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* The destination directory |
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* @param targetpath |
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* The name to give the file in the destination directory |
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* |
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* @throws ClosedDirectoryStreamException |
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* If this or the target directory stream is closed |
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* @throws FileAlreadyExistsException |
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* The file already exists in the target directory and cannot |
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* be replaced <i>(optional specific exception)</i> |
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* @throws AtomicMoveNotSupportedException |
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* The file cannot be moved as an atomic file system operation |
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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, the {@link SecurityManager#checkWrite(String) checkWrite} |
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* method is invoked to check write access to both the source and |
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* target file. |
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*/ |
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public abstract void move(Path srcpath, SecureDirectoryStream targetdir, Path targetpath) |
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throws IOException; |
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|
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/** |
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* Returns a new file attribute view to access the file attributes of this |
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* directory. |
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* |
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* <p> The resulting file attribute view can be used to read or update the |
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* attributes of this (open) directory. The {@code type} parameter specifies |
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* the type of the attribute view and the method returns an instance of that |
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* type if supported. Invoking this method to obtain a {@link |
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* BasicFileAttributeView} always returns an instance of that class that is |
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* bound to this open directory. |
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* |
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* <p> The state of resulting file attribute view is intimately connected |
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* to this directory stream. Once the directory stream is {@link #close closed}, |
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* then all methods to read or update attributes will throw {@link |
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* ClosedDirectoryStreamException ClosedDirectoryStreamException}. |
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* |
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* @param type |
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* The {@code Class} object corresponding to the file attribute view |
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* |
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* @return A new file attribute view of the specified type bound to |
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* this directory stream, or {@code null} if the attribute view |
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* type is not available |
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*/ |
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public abstract <V extends FileAttributeView> V getFileAttributeView(Class<V> type); |
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|
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/** |
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* Returns a new file attribute view to access the file attributes of a file |
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* in this directory. |
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* |
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* <p> The resulting file attribute view can be used to read or update the |
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* attributes of file in this directory. The {@code type} parameter specifies |
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* the type of the attribute view and the method returns an instance of that |
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* type if supported. Invoking this method to obtain a {@link |
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* BasicFileAttributeView} always returns an instance of that class that is |
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* bound to the file in the directory. |
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* |
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* <p> The state of resulting file attribute view is intimately connected |
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* to this directory stream. Once the directory stream {@link #close closed}, |
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* then all methods to read or update attributes will throw {@link |
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* ClosedDirectoryStreamException ClosedDirectoryStreamException}. The |
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* file is not required to exist at the time that the file attribute view |
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* is created but methods to read or update attributes of the file will |
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* fail when invoked and the file does not exist. |
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* |
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* @param path |
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* The path of the file |
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* @param type |
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* The {@code Class} object corresponding to the file attribute view |
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* @param options |
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* Options indicating how symbolic links are handled |
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* |
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* @return A new file attribute view of the specified type bound to a |
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* this directory stream, or {@code null} if the attribute view |
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* type is not available |
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* |
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*/ |
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public abstract <V extends FileAttributeView> V getFileAttributeView(Path path, |
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Class<V> type, |
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LinkOption... options); |
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} |