author | alanb |
Thu, 18 Apr 2013 11:13:18 +0100 | |
changeset 17154 | e8991539c4d7 |
parent 9035 | 1255eb81cc2f |
child 18574 | 4aeaeb541678 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2007, 2011, Oracle and/or its affiliates. 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. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package java.nio.file.attribute; |
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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 a <em>basic set</em> of file |
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* attributes common to many file systems. The basic set of file attributes |
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* consist of <em>mandatory</em> and <em>optional</em> file attributes as |
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* defined by the {@link BasicFileAttributes} interface. |
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* <p> The file attributes are retrieved from the file system as a <em>bulk |
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* operation</em> by invoking the {@link #readAttributes() readAttributes} method. |
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* This class also defines the {@link #setTimes setTimes} method to update the |
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* file's time attributes. |
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* |
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* <p> Where dynamic access to file attributes is required, the attributes |
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* supported by this attribute view have the following names and types: |
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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> "lastModifiedTime" </td> |
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* <td> {@link FileTime} </td> |
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* </tr> |
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* <tr> |
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* <td> "lastAccessTime" </td> |
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* <td> {@link FileTime} </td> |
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* </tr> |
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* <tr> |
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* <td> "creationTime" </td> |
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* <td> {@link FileTime} </td> |
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* </tr> |
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* <tr> |
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* <td> "size" </td> |
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* <td> {@link Long} </td> |
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* </tr> |
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* <tr> |
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* <td> "isRegularFile" </td> |
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* <td> {@link Boolean} </td> |
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* </tr> |
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* <tr> |
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* <td> "isDirectory" </td> |
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* <td> {@link Boolean} </td> |
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* </tr> |
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* <tr> |
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* <td> "isSymbolicLink" </td> |
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* <td> {@link Boolean} </td> |
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* </tr> |
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* <tr> |
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* <td> "isOther" </td> |
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* <td> {@link Boolean} </td> |
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* </tr> |
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* <tr> |
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* <td> "fileKey" </td> |
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* <td> {@link Object} </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 java.nio.file.Files#getAttribute getAttribute} method may be |
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* used to read any of these attributes as if by invoking the {@link |
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* #readAttributes() readAttributes()} method. |
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* |
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* <p> The {@link java.nio.file.Files#setAttribute setAttribute} method may be |
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* used to update the file's last modified time, last access time or create time |
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* attributes as if by invoking the {@link #setTimes setTimes} method. |
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* |
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* @since 1.7 |
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*/ |
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public interface BasicFileAttributeView |
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extends FileAttributeView |
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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 "basic"}. |
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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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* Reads the basic file attributes as a bulk operation. |
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* |
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* <p> It is implementation specific if all file attributes are read as an |
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* atomic operation with respect to other file system operations. |
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* |
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* @return the file attributes |
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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, its {@link SecurityManager#checkRead(String) checkRead} |
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* method is invoked to check read access to the file |
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*/ |
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BasicFileAttributes readAttributes() throws IOException; |
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|
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/** |
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* Updates any or all of the file's last modified time, last access time, |
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* and create time attributes. |
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* |
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* <p> This method updates the file's timestamp attributes. The values are |
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* converted to the epoch and precision supported by the file system. |
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* Converting from finer to coarser granularities result in precision loss. |
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* The behavior of this method when attempting to set a timestamp that is |
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* not supported or to a value that is outside the range supported by the |
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* underlying file store is not defined. It may or not fail by throwing an |
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* {@code IOException}. |
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* |
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* <p> If any of the {@code lastModifiedTime}, {@code lastAccessTime}, |
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* or {@code createTime} parameters has the value {@code null} then the |
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* corresponding timestamp is not changed. An implementation may require to |
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* read the existing values of the file attributes when only some, but not |
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* all, of the timestamp attributes are updated. Consequently, this method |
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* may not be an atomic operation with respect to other file system |
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* operations. Reading and re-writing existing values may also result in |
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* precision loss. If all of the {@code lastModifiedTime}, {@code |
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* lastAccessTime} and {@code createTime} parameters are {@code null} then |
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* this method has no effect. |
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* |
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* <p> <b>Usage Example:</b> |
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* Suppose we want to change a file's last access time. |
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* <pre> |
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* Path path = ... |
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* FileTime time = ... |
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* Files.getFileAttributeView(path, BasicFileAttributeView.class).setTimes(null, time, null); |
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* </pre> |
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* |
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* @param lastModifiedTime |
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* the new last modified time, or {@code null} to not change the |
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* value |
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* @param lastAccessTime |
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* the last access time, or {@code null} to not change the value |
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* @param createTime |
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* the file's create time, or {@code null} to not change the value |
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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, its {@link SecurityManager#checkWrite(String) checkWrite} |
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* method is invoked to check write access to the file |
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* |
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* @see java.nio.file.Files#setLastModifiedTime |
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*/ |
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void setTimes(FileTime lastModifiedTime, |
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FileTime lastAccessTime, |
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FileTime createTime) throws IOException; |
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} |