author | ohair |
Wed, 06 Apr 2011 22:06:11 -0700 | |
changeset 9035 | 1255eb81cc2f |
parent 8158 | 77d9c0f1c19f |
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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/** |
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* Basic attributes associated with a file in a file system. |
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* |
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* <p> Basic file attributes are attributes that are common to many file systems |
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* and consist of mandatory and optional file attributes as defined by this |
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* interface. |
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* |
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* <p> <b>Usage Example:</b> |
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* <pre> |
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* Path file = ... |
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* BasicFileAttributes attrs = Files.readAttributes(file, BasicFileAttributes.class); |
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* </pre> |
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* |
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* @since 1.7 |
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* |
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* @see BasicFileAttributeView |
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*/ |
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public interface BasicFileAttributes { |
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/** |
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* Returns the time of last modification. |
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* |
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* <p> If the file system implementation does not support a time stamp |
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* to indicate the time of last modification then this method returns an |
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* implementation specific default value, typically a {@code FileTime} |
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* representing the epoch (1970-01-01T00:00:00Z). |
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* |
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* @return a {@code FileTime} representing the time the file was last |
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* modified |
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*/ |
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FileTime lastModifiedTime(); |
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/** |
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* Returns the time of last access. |
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* |
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* <p> If the file system implementation does not support a time stamp |
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* to indicate the time of last access then this method returns |
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* an implementation specific default value, typically the {@link |
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* #lastModifiedTime() last-modified-time} or a {@code FileTime} |
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* representing the epoch (1970-01-01T00:00:00Z). |
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* |
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* @return a {@code FileTime} representing the time of last access |
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*/ |
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FileTime lastAccessTime(); |
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/** |
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* Returns the creation time. The creation time is the time that the file |
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* was created. |
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* |
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* <p> If the file system implementation does not support a time stamp |
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* to indicate the time when the file was created then this method returns |
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* an implementation specific default value, typically the {@link |
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* #lastModifiedTime() last-modified-time} or a {@code FileTime} |
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* representing the epoch (1970-01-01T00:00:00Z). |
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* |
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* @return a {@code FileTime} representing the time the file was created |
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*/ |
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FileTime creationTime(); |
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/** |
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* Tells whether the file is a regular file with opaque content. |
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*/ |
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boolean isRegularFile(); |
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/** |
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* Tells whether the file is a directory. |
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*/ |
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boolean isDirectory(); |
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/** |
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* Tells whether the file is a symbolic link. |
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*/ |
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boolean isSymbolicLink(); |
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/** |
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* Tells whether the file is something other than a regular file, directory, |
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* or symbolic link. |
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*/ |
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boolean isOther(); |
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/** |
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* Returns the size of the file (in bytes). The size may differ from the |
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* actual size on the file system due to compression, support for sparse |
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* files, or other reasons. The size of files that are not {@link |
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* #isRegularFile regular} files is implementation specific and |
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* therefore unspecified. |
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* |
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* @return the file size, in bytes |
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*/ |
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long size(); |
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/** |
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* Returns an object that uniquely identifies the given file, or {@code |
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* null} if a file key is not available. On some platforms or file systems |
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* it is possible to use an identifier, or a combination of identifiers to |
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* uniquely identify a file. Such identifiers are important for operations |
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* such as file tree traversal in file systems that support <a |
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* href="../package-summary.html#links">symbolic links</a> or file systems |
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* that allow a file to be an entry in more than one directory. On UNIX file |
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* systems, for example, the <em>device ID</em> and <em>inode</em> are |
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* commonly used for such purposes. |
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* |
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* <p> The file key returned by this method can only be guaranteed to be |
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* unique if the file system and files remain static. Whether a file system |
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* re-uses identifiers after a file is deleted is implementation dependent and |
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* therefore unspecified. |
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* |
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* <p> File keys returned by this method can be compared for equality and are |
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* suitable for use in collections. If the file system and files remain static, |
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* and two files are the {@link java.nio.file.Files#isSameFile same} with |
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* non-{@code null} file keys, then their file keys are equal. |
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* |
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* @see java.nio.file.Files#walkFileTree |
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*/ |
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Object fileKey(); |
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} |