author | jjg |
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parent 45124 | 144479e89cdb |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2007, 2017, 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; |
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import java.nio.file.attribute.*; |
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import java.nio.file.spi.FileSystemProvider; |
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import java.util.Set; |
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import java.io.Closeable; |
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import java.io.IOException; |
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/** |
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* Provides an interface to a file system and is the factory for objects to |
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* access files and other objects in the file system. |
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* |
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* <p> The default file system, obtained by invoking the {@link FileSystems#getDefault |
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* FileSystems.getDefault} method, provides access to the file system that is |
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* accessible to the Java virtual machine. The {@link FileSystems} class defines |
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* methods to create file systems that provide access to other types of (custom) |
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* file systems. |
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* |
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* <p> A file system is the factory for several types of objects: |
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* |
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* <ul> |
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* <li><p> The {@link #getPath getPath} method converts a system dependent |
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* <em>path string</em>, returning a {@link Path} object that may be used |
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* to locate and access a file. </p></li> |
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* <li><p> The {@link #getPathMatcher getPathMatcher} method is used |
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* to create a {@link PathMatcher} that performs match operations on |
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* paths. </p></li> |
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* <li><p> The {@link #getFileStores getFileStores} method returns an iterator |
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* over the underlying {@link FileStore file-stores}. </p></li> |
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* <li><p> The {@link #getUserPrincipalLookupService getUserPrincipalLookupService} |
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* method returns the {@link UserPrincipalLookupService} to lookup users or |
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* groups by name. </p></li> |
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* <li><p> The {@link #newWatchService newWatchService} method creates a |
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* {@link WatchService} that may be used to watch objects for changes and |
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* events. </p></li> |
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* </ul> |
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* |
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* <p> File systems vary greatly. In some cases the file system is a single |
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* hierarchy of files with one top-level root directory. In other cases it may |
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* have several distinct file hierarchies, each with its own top-level root |
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* directory. The {@link #getRootDirectories getRootDirectories} method may be |
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* used to iterate over the root directories in the file system. A file system |
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* is typically composed of one or more underlying {@link FileStore file-stores} |
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* that provide the storage for the files. Theses file stores can also vary in |
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* the features they support, and the file attributes or <em>meta-data</em> that |
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* they associate with files. |
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* |
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* <p> A file system is open upon creation and can be closed by invoking its |
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* {@link #close() close} method. Once closed, any further attempt to access |
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* objects in the file system cause {@link ClosedFileSystemException} to be |
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* thrown. File systems created by the default {@link FileSystemProvider provider} |
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* cannot be closed. |
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* |
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* <p> A {@code FileSystem} can provide read-only or read-write access to the |
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* file system. Whether or not a file system provides read-only access is |
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* established when the {@code FileSystem} is created and can be tested by invoking |
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* its {@link #isReadOnly() isReadOnly} method. Attempts to write to file stores |
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* by means of an object associated with a read-only file system throws {@link |
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* ReadOnlyFileSystemException}. |
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* |
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* <p> File systems are safe for use by multiple concurrent threads. The {@link |
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* #close close} method may be invoked at any time to close a file system but |
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* whether a file system is <i>asynchronously closeable</i> is provider specific |
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* and therefore unspecified. In other words, if a thread is accessing an |
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* object in a file system, and another thread invokes the {@code close} method |
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* then it may require to block until the first operation is complete. Closing |
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* a file system causes all open channels, watch services, and other {@link |
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* Closeable closeable} objects associated with the file system to be closed. |
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* |
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* @since 1.7 |
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*/ |
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public abstract class FileSystem |
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implements Closeable |
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{ |
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/** |
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* Initializes a new instance of this class. |
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*/ |
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protected FileSystem() { |
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} |
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/** |
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* Returns the provider that created this file system. |
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* |
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* @return The provider that created this file system. |
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*/ |
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public abstract FileSystemProvider provider(); |
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/** |
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* Closes this file system. |
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* |
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* <p> After a file system is closed then all subsequent access to the file |
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* system, either by methods defined by this class or on objects associated |
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* with this file system, throw {@link ClosedFileSystemException}. If the |
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* file system is already closed then invoking this method has no effect. |
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* |
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* <p> Closing a file system will close all open {@link |
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* java.nio.channels.Channel channels}, {@link DirectoryStream directory-streams}, |
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* {@link WatchService watch-service}, and other closeable objects associated |
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* with this file system. The {@link FileSystems#getDefault default} file |
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* system cannot be closed. |
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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 UnsupportedOperationException |
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* Thrown in the case of the default file system |
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*/ |
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@Override |
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public abstract void close() throws IOException; |
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|
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/** |
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* Tells whether or not this file system is open. |
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* |
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* <p> File systems created by the default provider are always open. |
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* |
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* @return {@code true} if, and only if, this file system is open |
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*/ |
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public abstract boolean isOpen(); |
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|
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/** |
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* Tells whether or not this file system allows only read-only access to |
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* its file stores. |
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* |
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* @return {@code true} if, and only if, this file system provides |
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* read-only access |
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*/ |
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public abstract boolean isReadOnly(); |
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153 |
|
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154 |
/** |
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* Returns the name separator, represented as a string. |
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* |
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* <p> The name separator is used to separate names in a path string. An |
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* implementation may support multiple name separators in which case this |
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* method returns an implementation specific <em>default</em> name separator. |
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* This separator is used when creating path strings by invoking the {@link |
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* Path#toString() toString()} method. |
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* |
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* <p> In the case of the default provider, this method returns the same |
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* separator as {@link java.io.File#separator}. |
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* |
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* @return The name separator |
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*/ |
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public abstract String getSeparator(); |
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169 |
|
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/** |
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* Returns an object to iterate over the paths of the root directories. |
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* |
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* <p> A file system provides access to a file store that may be composed |
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* of a number of distinct file hierarchies, each with its own top-level |
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* root directory. Unless denied by the security manager, each element in |
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* the returned iterator corresponds to the root directory of a distinct |
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* file hierarchy. The order of the elements is not defined. The file |
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* hierarchies may change during the lifetime of the Java virtual machine. |
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* For example, in some implementations, the insertion of removable media |
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* may result in the creation of a new file hierarchy with its own |
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* top-level directory. |
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* |
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* <p> When a security manager is installed, it is invoked to check access |
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* to the each root directory. If denied, the root directory is not returned |
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* by the iterator. In the case of the default provider, the {@link |
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* SecurityManager#checkRead(String)} method is invoked to check read access |
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* to each root directory. It is system dependent if the permission checks |
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* are done when the iterator is obtained or during iteration. |
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* |
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* @return An object to iterate over the root directories |
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*/ |
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public abstract Iterable<Path> getRootDirectories(); |
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193 |
|
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194 |
/** |
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* Returns an object to iterate over the underlying file stores. |
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* |
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* <p> The elements of the returned iterator are the {@link |
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* FileStore FileStores} for this file system. The order of the elements is |
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* not defined and the file stores may change during the lifetime of the |
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* Java virtual machine. When an I/O error occurs, perhaps because a file |
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* store is not accessible, then it is not returned by the iterator. |
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* |
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* <p> In the case of the default provider, and a security manager is |
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* installed, the security manager is invoked to check {@link |
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* RuntimePermission}{@code ("getFileStoreAttributes")}. If denied, then |
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* no file stores are returned by the iterator. In addition, the security |
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* manager's {@link SecurityManager#checkRead(String)} method is invoked to |
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* check read access to the file store's <em>top-most</em> directory. If |
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* denied, the file store is not returned by the iterator. It is system |
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* dependent if the permission checks are done when the iterator is obtained |
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* or during iteration. |
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* |
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* <p> <b>Usage Example:</b> |
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* Suppose we want to print the space usage for all file stores: |
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* <pre> |
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* for (FileStore store: FileSystems.getDefault().getFileStores()) { |
8158 | 217 |
* long total = store.getTotalSpace() / 1024; |
218 |
* long used = (store.getTotalSpace() - store.getUnallocatedSpace()) / 1024; |
|
219 |
* long avail = store.getUsableSpace() / 1024; |
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* System.out.format("%-20s %12d %12d %12d%n", store, total, used, avail); |
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* } |
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* </pre> |
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* |
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* @return An object to iterate over the backing file stores |
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*/ |
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public abstract Iterable<FileStore> getFileStores(); |
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|
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/** |
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* Returns the set of the {@link FileAttributeView#name names} of the file |
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* attribute views supported by this {@code FileSystem}. |
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* |
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* <p> The {@link BasicFileAttributeView} is required to be supported and |
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* therefore the set contains at least one element, "basic". |
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* |
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* <p> The {@link FileStore#supportsFileAttributeView(String) |
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* supportsFileAttributeView(String)} method may be used to test if an |
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* underlying {@link FileStore} supports the file attributes identified by a |
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* file attribute view. |
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* |
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* @return An unmodifiable set of the names of the supported file attribute |
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* views |
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*/ |
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public abstract Set<String> supportedFileAttributeViews(); |
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|
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/** |
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* Converts a path string, or a sequence of strings that when joined form |
247 |
* a path string, to a {@code Path}. If {@code more} does not specify any |
|
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* elements then the value of the {@code first} parameter is the path string |
|
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* to convert. If {@code more} specifies one or more elements then each |
|
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* non-empty string, including {@code first}, is considered to be a sequence |
|
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* of name elements (see {@link Path}) and is joined to form a path string. |
|
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* The details as to how the Strings are joined is provider specific but |
|
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* typically they will be joined using the {@link #getSeparator |
|
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* name-separator} as the separator. For example, if the name separator is |
|
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* "{@code /}" and {@code getPath("/foo","bar","gus")} is invoked, then the |
|
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* path string {@code "/foo/bar/gus"} is converted to a {@code Path}. |
|
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* A {@code Path} representing an empty path is returned if {@code first} |
|
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* is the empty string and {@code more} does not contain any non-empty |
|
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* strings. |
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* |
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* <p> The parsing and conversion to a path object is inherently |
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* implementation dependent. In the simplest case, the path string is rejected, |
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* and {@link InvalidPathException} thrown, if the path string contains |
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* characters that cannot be converted to characters that are <em>legal</em> |
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* to the file store. For example, on UNIX systems, the NUL (\u0000) |
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* character is not allowed to be present in a path. An implementation may |
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* choose to reject path strings that contain names that are longer than those |
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* allowed by any file store, and where an implementation supports a complex |
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* path syntax, it may choose to reject path strings that are <em>badly |
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* formed</em>. |
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* |
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* <p> In the case of the default provider, path strings are parsed based |
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* on the definition of paths at the platform or virtual file system level. |
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* For example, an operating system may not allow specific characters to be |
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* present in a file name, but a specific underlying file store may impose |
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* different or additional restrictions on the set of legal |
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* characters. |
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* |
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* <p> This method throws {@link InvalidPathException} when the path string |
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* cannot be converted to a path. Where possible, and where applicable, |
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* the exception is created with an {@link InvalidPathException#getIndex |
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* index} value indicating the first position in the {@code path} parameter |
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* that caused the path string to be rejected. |
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* |
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* @param first |
286 |
* the path string or initial part of the path string |
|
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* @param more |
|
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* additional strings to be joined to form the path string |
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* |
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* @return the resulting {@code Path} |
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* |
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* @throws InvalidPathException |
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* If the path string cannot be converted |
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*/ |
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public abstract Path getPath(String first, String... more); |
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|
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/** |
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* Returns a {@code PathMatcher} that performs match operations on the |
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* {@code String} representation of {@link Path} objects by interpreting a |
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* given pattern. |
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* |
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* The {@code syntaxAndPattern} parameter identifies the syntax and the |
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* pattern and takes the form: |
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* <blockquote><pre> |
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* <i>syntax</i><b>:</b><i>pattern</i> |
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* </pre></blockquote> |
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* where {@code ':'} stands for itself. |
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* |
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* <p> A {@code FileSystem} implementation supports the "{@code glob}" and |
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* "{@code regex}" syntaxes, and may support others. The value of the syntax |
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* component is compared without regard to case. |
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* |
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* <p> When the syntax is "{@code glob}" then the {@code String} |
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* representation of the path is matched using a limited pattern language |
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* that resembles regular expressions but with a simpler syntax. For example: |
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* |
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* <table class="striped" style="text-align:left; margin-left:2em"> |
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* <caption style="display:none">Pattern Language</caption> |
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* <thead> |
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* <tr> |
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* <th scope="col">Example |
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* <th scope="col">Description |
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* </tr> |
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* </thead> |
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* <tbody> |
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* <tr> |
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* <th scope="row">{@code *.java}</th> |
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* <td>Matches a path that represents a file name ending in {@code .java}</td> |
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* </tr> |
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* <tr> |
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* <th scope="row">{@code *.*}</th> |
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* <td>Matches file names containing a dot</td> |
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* </tr> |
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* <tr> |
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* <th scope="row">{@code *.{java,class}}</th> |
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* <td>Matches file names ending with {@code .java} or {@code .class}</td> |
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* </tr> |
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* <tr> |
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* <th scope="row">{@code foo.?}</th> |
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* <td>Matches file names starting with {@code foo.} and a single |
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* character extension</td> |
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* </tr> |
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* <tr> |
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* <th scope="row"><code>/home/*/*</code> |
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* <td>Matches <code>/home/gus/data</code> on UNIX platforms</td> |
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* </tr> |
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* <tr> |
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* <th scope="row"><code>/home/**</code> |
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* <td>Matches <code>/home/gus</code> and |
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* <code>/home/gus/data</code> on UNIX platforms</td> |
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* </tr> |
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* <tr> |
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* <th scope="row"><code>C:\\*</code> |
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* <td>Matches <code>C:\foo</code> and <code>C:\bar</code> on the Windows |
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* platform (note that the backslash is escaped; as a string literal in the |
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* Java Language the pattern would be <code>"C:\\\\*"</code>) </td> |
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357 |
* </tr> |
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358 |
* </tbody> |
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359 |
* </table> |
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|
360 |
* |
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|
361 |
* <p> The following rules are used to interpret glob patterns: |
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362 |
* |
21334 | 363 |
* <ul> |
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|
364 |
* <li><p> The {@code *} character matches zero or more {@link Character |
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|
365 |
* characters} of a {@link Path#getName(int) name} component without |
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366 |
* crossing directory boundaries. </p></li> |
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|
367 |
* |
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|
368 |
* <li><p> The {@code **} characters matches zero or more {@link Character |
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|
369 |
* characters} crossing directory boundaries. </p></li> |
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|
370 |
* |
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|
371 |
* <li><p> The {@code ?} character matches exactly one character of a |
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|
372 |
* name component.</p></li> |
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|
373 |
* |
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|
374 |
* <li><p> The backslash character ({@code \}) is used to escape characters |
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|
375 |
* that would otherwise be interpreted as special characters. The expression |
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|
376 |
* {@code \\} matches a single backslash and "\{" matches a left brace |
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|
377 |
* for example. </p></li> |
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|
378 |
* |
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|
379 |
* <li><p> The {@code [ ]} characters are a <i>bracket expression</i> that |
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|
380 |
* match a single character of a name component out of a set of characters. |
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|
381 |
* For example, {@code [abc]} matches {@code "a"}, {@code "b"}, or {@code "c"}. |
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|
382 |
* The hyphen ({@code -}) may be used to specify a range so {@code [a-z]} |
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|
383 |
* specifies a range that matches from {@code "a"} to {@code "z"} (inclusive). |
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|
384 |
* These forms can be mixed so [abce-g] matches {@code "a"}, {@code "b"}, |
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|
385 |
* {@code "c"}, {@code "e"}, {@code "f"} or {@code "g"}. If the character |
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|
386 |
* after the {@code [} is a {@code !} then it is used for negation so {@code |
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|
387 |
* [!a-c]} matches any character except {@code "a"}, {@code "b"}, or {@code |
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|
388 |
* "c"}. |
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|
389 |
* <p> Within a bracket expression the {@code *}, {@code ?} and {@code \} |
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|
390 |
* characters match themselves. The ({@code -}) character matches itself if |
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|
391 |
* it is the first character within the brackets, or the first character |
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|
392 |
* after the {@code !} if negating.</p></li> |
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|
393 |
* |
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|
394 |
* <li><p> The {@code { }} characters are a group of subpatterns, where |
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|
395 |
* the group matches if any subpattern in the group matches. The {@code ","} |
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|
396 |
* character is used to separate the subpatterns. Groups cannot be nested. |
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|
397 |
* </p></li> |
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|
398 |
* |
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|
399 |
* <li><p> Leading period<code>/</code>dot characters in file name are |
9497 | 400 |
* treated as regular characters in match operations. For example, |
401 |
* the {@code "*"} glob pattern matches file name {@code ".login"}. |
|
402 |
* The {@link Files#isHidden} method may be used to test whether a file |
|
403 |
* is considered hidden. |
|
404 |
* </p></li> |
|
405 |
* |
|
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406 |
* <li><p> All other characters match themselves in an implementation |
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|
407 |
* dependent manner. This includes characters representing any {@link |
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|
408 |
* FileSystem#getSeparator name-separators}. </p></li> |
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|
409 |
* |
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|
410 |
* <li><p> The matching of {@link Path#getRoot root} components is highly |
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|
411 |
* implementation-dependent and is not specified. </p></li> |
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|
412 |
* |
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|
413 |
* </ul> |
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|
414 |
* |
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|
415 |
* <p> When the syntax is "{@code regex}" then the pattern component is a |
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|
416 |
* regular expression as defined by the {@link java.util.regex.Pattern} |
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|
417 |
* class. |
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|
418 |
* |
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|
419 |
* <p> For both the glob and regex syntaxes, the matching details, such as |
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|
420 |
* whether the matching is case sensitive, are implementation-dependent |
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|
421 |
* and therefore not specified. |
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|
422 |
* |
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|
423 |
* @param syntaxAndPattern |
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|
424 |
* The syntax and pattern |
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|
425 |
* |
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|
426 |
* @return A path matcher that may be used to match paths against the pattern |
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|
427 |
* |
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|
428 |
* @throws IllegalArgumentException |
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|
429 |
* If the parameter does not take the form: {@code syntax:pattern} |
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|
430 |
* @throws java.util.regex.PatternSyntaxException |
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|
431 |
* If the pattern is invalid |
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|
432 |
* @throws UnsupportedOperationException |
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|
433 |
* If the pattern syntax is not known to the implementation |
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|
434 |
* |
8158 | 435 |
* @see Files#newDirectoryStream(Path,String) |
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436 |
*/ |
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|
437 |
public abstract PathMatcher getPathMatcher(String syntaxAndPattern); |
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|
438 |
|
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|
439 |
/** |
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|
440 |
* Returns the {@code UserPrincipalLookupService} for this file system |
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|
441 |
* <i>(optional operation)</i>. The resulting lookup service may be used to |
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|
442 |
* lookup user or group names. |
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|
443 |
* |
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|
444 |
* <p> <b>Usage Example:</b> |
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|
445 |
* Suppose we want to make "joe" the owner of a file: |
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|
446 |
* <pre> |
8158 | 447 |
* UserPrincipalLookupService lookupService = FileSystems.getDefault().getUserPrincipalLookupService(); |
448 |
* Files.setOwner(path, lookupService.lookupPrincipalByName("joe")); |
|
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449 |
* </pre> |
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|
450 |
* |
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|
451 |
* @throws UnsupportedOperationException |
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|
452 |
* If this {@code FileSystem} does not does have a lookup service |
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|
453 |
* |
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|
454 |
* @return The {@code UserPrincipalLookupService} for this file system |
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|
455 |
*/ |
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|
456 |
public abstract UserPrincipalLookupService getUserPrincipalLookupService(); |
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|
457 |
|
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|
458 |
/** |
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|
459 |
* Constructs a new {@link WatchService} <i>(optional operation)</i>. |
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|
460 |
* |
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|
461 |
* <p> This method constructs a new watch service that may be used to watch |
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|
462 |
* registered objects for changes and events. |
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|
463 |
* |
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|
464 |
* @return a new watch service |
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|
465 |
* |
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|
466 |
* @throws UnsupportedOperationException |
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|
467 |
* If this {@code FileSystem} does not support watching file system |
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|
468 |
* objects for changes and events. This exception is not thrown |
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|
469 |
* by {@code FileSystems} created by the default provider. |
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|
470 |
* @throws IOException |
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|
471 |
* If an I/O error occurs |
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|
472 |
*/ |
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6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
diff
changeset
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473 |
public abstract WatchService newWatchService() throws IOException; |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
diff
changeset
|
474 |
} |