author | alanb |
Sat, 27 Jun 2009 21:46:53 +0100 | |
changeset 3065 | 452aaa2899fc |
parent 2057 | 3acf8e5e2ca0 |
child 5506 | 202f599c92aa |
permissions | -rw-r--r-- |
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/* |
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* Copyright 2007-2009 Sun Microsystems, Inc. All Rights Reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Sun designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Sun in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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* CA 95054 USA or visit www.sun.com if you need additional information or |
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* have any questions. |
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*/ |
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package java.nio.file.spi; |
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|
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import java.nio.file.*; |
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import java.nio.file.attribute.FileAttribute; |
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import java.nio.channels.*; |
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import java.net.URI; |
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import java.util.*; |
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import java.util.concurrent.ExecutorService; |
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import java.security.AccessController; |
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import java.security.PrivilegedAction; |
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import java.io.IOException; |
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|
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/** |
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* Service-provider class for file systems. |
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* |
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* <p> A file system provider is a concrete implementation of this class that |
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* implements the abstract methods defined by this class. A provider is |
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* identified by a {@code URI} {@link #getScheme() scheme}. The default provider |
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* is identified by the URI scheme "file". It creates the {@link FileSystem} that |
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* provides access to the file systems accessible to the Java virtual machine. |
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* The {@link FileSystems} class defines how file system providers are located |
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* and loaded. The default provider is typically a system-default provider but |
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* may be overridden if the system property {@code |
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* java.nio.file.spi.DefaultFileSystemProvider} is set. In that case, the |
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* provider has a one argument constructor whose formal parameter type is {@code |
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* FileSystemProvider}. All other providers have a zero argument constructor |
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* that initializes the provider. |
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* |
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* <p> A provider is a factory for one or more {@link FileSystem} instances. Each |
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* file system is identified by a {@code URI} where the URI's scheme matches |
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* the provider's {@link #getScheme scheme}. The default file system, for example, |
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* is identified by the URI {@code "file:///"}. A memory-based file system, |
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* for example, may be identified by a URI such as {@code "memory:///?name=logfs"}. |
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* The {@link #newFileSystem newFileSystem} method may be used to create a file |
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* system, and the {@link #getFileSystem getFileSystem} method may be used to |
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* obtain a reference to an existing file system created by the provider. Where |
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* a provider is the factory for a single file system then it is provider dependent |
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* if the file system is created when the provider is initialized, or later when |
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* the {@code newFileSystem} method is invoked. In the case of the default |
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* provider, the {@code FileSystem} is created when the provider is initialized. |
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* |
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* <p> In addition to file systems, a provider is also a factory for {@link |
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* FileChannel} and {@link AsynchronousFileChannel} channels. The {@link |
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* #newFileChannel newFileChannel} and {@link #newAsynchronousFileChannel |
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* AsynchronousFileChannel} methods are defined to open or create files, returning |
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* a channel to access the file. These methods are invoked by static factory |
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* methods defined in the {@link java.nio.channels} package. |
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* |
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* <p> All of the methods in this class are safe for use by multiple concurrent |
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* threads. |
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* |
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* @since 1.7 |
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*/ |
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public abstract class FileSystemProvider { |
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// lock using when loading providers |
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private static final Object lock = new Object(); |
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// installed providers |
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private static volatile List<FileSystemProvider> installedProviders; |
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// used to avoid recursive loading of instaled providers |
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private static boolean loadingProviders = false; |
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|
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private static Void checkPermission() { |
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SecurityManager sm = System.getSecurityManager(); |
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if (sm != null) |
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sm.checkPermission(new RuntimePermission("fileSystemProvider")); |
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return null; |
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} |
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private FileSystemProvider(Void ignore) { } |
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/** |
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* Initializes a new instance of this class. |
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* |
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* <p> During construction a provider may safely access files associated |
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* with the default provider but care needs to be taken to avoid circular |
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* loading of other installed providers. If circular loading of installed |
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* providers is detected then an unspecified error is thrown. |
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* |
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* @throws SecurityException |
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* If a security manager has been installed and it denies |
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* {@link RuntimePermission}<tt>("fileSystemProvider")</tt> |
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*/ |
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protected FileSystemProvider() { |
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this(checkPermission()); |
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112 |
} |
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113 |
|
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114 |
// loads all installed providers |
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115 |
private static List<FileSystemProvider> loadInstalledProviders() { |
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List<FileSystemProvider> list = new ArrayList<FileSystemProvider>(); |
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117 |
|
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118 |
ServiceLoader<FileSystemProvider> sl = ServiceLoader |
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119 |
.load(FileSystemProvider.class, ClassLoader.getSystemClassLoader()); |
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120 |
|
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121 |
// ServiceConfigurationError may be throw here |
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122 |
for (FileSystemProvider provider: sl) { |
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123 |
String scheme = provider.getScheme(); |
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124 |
|
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125 |
// add to list if the provider is not "file" and isn't a duplicate |
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126 |
if (!scheme.equalsIgnoreCase("file")) { |
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127 |
boolean found = false; |
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128 |
for (FileSystemProvider p: list) { |
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129 |
if (p.getScheme().equalsIgnoreCase(scheme)) { |
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130 |
found = true; |
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131 |
break; |
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132 |
} |
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133 |
} |
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134 |
if (!found) { |
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135 |
list.add(provider); |
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136 |
} |
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137 |
} |
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|
138 |
} |
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139 |
return list; |
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140 |
} |
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|
141 |
|
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|
142 |
/** |
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143 |
* Returns a list of the installed file system providers. |
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144 |
* |
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|
145 |
* <p> The first invocation of this method causes the default provider to be |
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146 |
* initialized (if not already initialized) and loads any other installed |
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147 |
* providers as described by the {@link FileSystems} class. |
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148 |
* |
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|
149 |
* @return An unmodifiable list of the installed file system providers. The |
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150 |
* list contains at least one element, that is the default file |
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|
151 |
* system provider |
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|
152 |
* |
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153 |
* @throws ServiceConfigurationError |
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154 |
* When an error occurs while loading a service provider |
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155 |
*/ |
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156 |
public static List<FileSystemProvider> installedProviders() { |
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|
157 |
if (installedProviders == null) { |
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158 |
// ensure default provider is initialized |
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|
159 |
FileSystemProvider defaultProvider = FileSystems.getDefault().provider(); |
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|
160 |
|
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|
161 |
synchronized (lock) { |
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|
162 |
if (installedProviders == null) { |
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|
163 |
if (loadingProviders) { |
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|
164 |
throw new Error("Circular loading of installed providers detected"); |
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|
165 |
} |
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|
166 |
loadingProviders = true; |
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|
167 |
|
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|
168 |
List<FileSystemProvider> list = AccessController |
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|
169 |
.doPrivileged(new PrivilegedAction<List<FileSystemProvider>>() { |
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170 |
@Override |
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|
171 |
public List<FileSystemProvider> run() { |
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|
172 |
return loadInstalledProviders(); |
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|
173 |
}}); |
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|
174 |
|
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|
175 |
// insert the default provider at the start of the list |
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|
176 |
list.add(0, defaultProvider); |
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|
177 |
|
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|
178 |
installedProviders = Collections.unmodifiableList(list); |
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|
179 |
} |
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|
180 |
} |
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|
181 |
} |
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|
182 |
return installedProviders; |
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|
183 |
} |
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|
184 |
|
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|
185 |
/** |
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|
186 |
* Returns the URI scheme that identifies this provider. |
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|
187 |
* |
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|
188 |
* @return The URI scheme |
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|
189 |
*/ |
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|
190 |
public abstract String getScheme(); |
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|
191 |
|
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|
192 |
/** |
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|
193 |
* Constructs a new {@code FileSystem} object identified by a URI. This |
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|
194 |
* method is invoked by the {@link FileSystems#newFileSystem(URI,Map)} |
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|
195 |
* method to open a new file system identified by a URI. |
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|
196 |
* |
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|
197 |
* <p> The {@code uri} parameter is an absolute, hierarchical URI, with a |
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|
198 |
* scheme equal (without regard to case) to the scheme supported by this |
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|
199 |
* provider. The exact form of the URI is highly provider dependent. The |
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|
200 |
* {@code env} parameter is a map of provider specific properties to configure |
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|
201 |
* the file system. |
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|
202 |
* |
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|
203 |
* <p> This method throws {@link FileSystemAlreadyExistsException} if the |
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|
204 |
* file system already exists because it was previously created by an |
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|
205 |
* invocation of this method. Once a file system is {@link FileSystem#close |
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|
206 |
* closed} it is provider-dependent if the provider allows a new file system |
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|
207 |
* to be created with the same URI as a file system it previously created. |
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|
208 |
* |
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|
209 |
* @param uri |
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|
210 |
* URI reference |
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|
211 |
* @param env |
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|
212 |
* A map of provider specific properties to configure the file system; |
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|
213 |
* may be empty |
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|
214 |
* |
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|
215 |
* @return A new file system |
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|
216 |
* |
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|
217 |
* @throws IllegalArgumentException |
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|
218 |
* If the pre-conditions for the {@code uri} parameter aren't met, |
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219 |
* or the {@code env} parameter does not contain properties required |
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|
220 |
* by the provider, or a property value is invalid |
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|
221 |
* @throws IOException |
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|
222 |
* An I/O error occurs creating the file system |
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|
223 |
* @throws SecurityException |
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|
224 |
* If a security manager is installed and it denies an unspecified |
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|
225 |
* permission required by the file system provider implementation |
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|
226 |
* @throws FileSystemAlreadyExistsException |
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|
227 |
* If the file system has already been created |
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*/ |
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public abstract FileSystem newFileSystem(URI uri, Map<String,?> env) |
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throws IOException; |
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|
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/** |
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* Returns an existing {@code FileSystem} created by this provider. |
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* |
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* <p> This method returns a reference to a {@code FileSystem} that was |
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* created by invoking the {@link #newFileSystem(URI,Map) newFileSystem(URI,Map)} |
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* method. File systems created the {@link #newFileSystem(FileRef,Map) |
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* newFileSystem(FileRef,Map)} method are not returned by this method. |
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* The file system is identified by its {@code URI}. Its exact form |
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* is highly provider dependent. In the case of the default provider the URI's |
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* path component is {@code "/"} and the authority, query and fragment components |
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* are undefined (Undefined components are represented by {@code null}). |
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* |
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* <p> Once a file system created by this provider is {@link FileSystem#close |
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* closed} it is provider-dependent if this method returns a reference to |
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* the closed file system or throws {@link FileSystemNotFoundException}. |
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* If the provider allows a new file system to be created with the same URI |
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* as a file system it previously created then this method throws the |
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* exception if invoked after the file system is closed (and before a new |
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* instance is created by the {@link #newFileSystem newFileSystem} method). |
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* |
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* <p> If a security manager is installed then a provider implementation |
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* may require to check a permission before returning a reference to an |
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* existing file system. In the case of the {@link FileSystems#getDefault |
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* default} file system, no permission check is required. |
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* |
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* @param uri |
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* URI reference |
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* |
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* @return The file system |
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* |
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* @throws IllegalArgumentException |
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* If the pre-conditions for the {@code uri} parameter aren't met |
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* @throws FileSystemNotFoundException |
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* If the file system does not exist |
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* @throws SecurityException |
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* If a security manager is installed and it denies an unspecified |
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* permission. |
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*/ |
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public abstract FileSystem getFileSystem(URI uri); |
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|
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/** |
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* Return a {@code Path} object by converting the given {@link URI}. The |
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* resulting {@code Path} is associated with a {@link FileSystem} that |
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* already exists or is constructed automatically. |
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* |
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* <p> The exact form of the URI is file system provider dependent. In the |
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* case of the default provider, the URI scheme is {@code "file"} and the |
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* given URI has a non-empty path component, and undefined query, and |
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* fragment components. The resulting {@code Path} is associated with the |
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* default {@link FileSystems#getDefault default} {@code FileSystem}. |
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* |
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* <p> If a security manager is installed then a provider implementation |
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* may require to check a permission. In the case of the {@link |
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* FileSystems#getDefault default} file system, no permission check is |
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* required. |
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* |
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* @param uri |
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* The URI to convert |
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* |
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* @throws IllegalArgumentException |
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* If the URI scheme does not identify this provider or other |
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* preconditions on the uri parameter do not hold |
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* @throws FileSystemNotFoundException |
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* The file system, identified by the URI, does not exist and |
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* cannot be created automatically |
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* @throws SecurityException |
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* If a security manager is installed and it denies an unspecified |
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* permission. |
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*/ |
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public abstract Path getPath(URI uri); |
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302 |
|
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/** |
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* Constructs a new {@code FileSystem} to access the contents of a file as a |
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* file system. |
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* |
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* <p> This method is intended for specialized providers of pseudo file |
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* systems where the contents of one or more files is treated as a file |
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* system. The {@code file} parameter is a reference to an existing file |
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* and the {@code env} parameter is a map of provider specific properties to |
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* configure the file system. |
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* |
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* <p> If this provider does not support the creation of such file systems |
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* or if the provider does not recognize the file type of the given file then |
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* it throws {@code UnsupportedOperationException}. The default implementation |
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* of this method throws {@code UnsupportedOperationException}. |
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* |
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* @param file |
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* The file |
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* @param env |
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* A map of provider specific properties to configure the file system; |
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* may be empty |
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* |
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* @return A new file system |
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* |
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* @throws UnsupportedOperationException |
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* If this provider does not support access to the contents as a |
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* file system or it does not recognize the file type of the |
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* given file |
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* @throws IllegalArgumentException |
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* If the {@code env} parameter does not contain properties required |
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* by the provider, or a property value is invalid |
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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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* If a security manager is installed and it denies an unspecified |
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* permission. |
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*/ |
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public FileSystem newFileSystem(FileRef file, Map<String,?> env) |
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throws IOException |
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341 |
{ |
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|
342 |
throw new UnsupportedOperationException(); |
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|
343 |
} |
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|
344 |
|
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|
345 |
/** |
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|
346 |
* Opens or creates a file for reading and/or writing, returning a file |
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|
347 |
* channel to access the file. |
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|
348 |
* |
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|
349 |
* <p> This method is invoked by the {@link FileChannel#open(Path,Set,FileAttribute[]) |
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|
350 |
* FileChannel.open} method to open a file channel. A provider that does not |
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|
351 |
* support all the features required to construct a file channel throws |
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|
352 |
* {@code UnsupportedOperationException}. The default provider is required |
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|
353 |
* to support the creation of file channels. When not overridden, the |
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|
354 |
* default implementation throws {@code UnsupportedOperationException}. |
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|
355 |
* |
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|
356 |
* @param path |
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|
357 |
* The path of the file to open or create |
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|
358 |
* @param options |
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|
359 |
* Options specifying how the file is opened |
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|
360 |
* @param attrs |
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|
361 |
* An optional list of file attributes to set atomically when |
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|
362 |
* creating the file |
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|
363 |
* |
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|
364 |
* @return A new file channel |
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|
365 |
* |
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|
366 |
* @throws IllegalArgumentException |
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|
367 |
* If the set contains an invalid combination of options |
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|
368 |
* @throws UnsupportedOperationException |
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|
369 |
* If this provider that does not support creating file channels, |
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|
370 |
* or an unsupported open option or file attribute is specified |
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|
371 |
* @throws IOException |
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|
372 |
* If an I/O error occurs |
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|
373 |
* @throws SecurityException |
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|
374 |
* In the case of the default file system, the {@link |
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|
375 |
* SecurityManager#checkRead(String)} method is invoked to check |
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|
376 |
* read access if the file is opened for reading. The {@link |
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|
377 |
* SecurityManager#checkWrite(String)} method is invoked to check |
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changeset
|
378 |
* write access if the file is opened for writing |
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|
379 |
*/ |
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|
380 |
public FileChannel newFileChannel(Path path, |
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|
381 |
Set<? extends OpenOption> options, |
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changeset
|
382 |
FileAttribute<?>... attrs) |
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|
383 |
throws IOException |
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parents:
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|
384 |
{ |
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parents:
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changeset
|
385 |
throw new UnsupportedOperationException(); |
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parents:
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|
386 |
} |
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parents:
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changeset
|
387 |
|
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alanb
parents:
diff
changeset
|
388 |
/** |
3acf8e5e2ca0
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alanb
parents:
diff
changeset
|
389 |
* Opens or creates a file for reading and/or writing, returning an |
3acf8e5e2ca0
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alanb
parents:
diff
changeset
|
390 |
* asynchronous file channel to access the file. |
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alanb
parents:
diff
changeset
|
391 |
* |
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changeset
|
392 |
* <p> This method is invoked by the {@link |
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|
393 |
* AsynchronousFileChannel#open(Path,Set,ExecutorService,FileAttribute[]) |
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changeset
|
394 |
* AsynchronousFileChannel.open} method to open an asynchronous file channel. |
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|
395 |
* A provider that does not support all the features required to construct |
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|
396 |
* an asynchronous file channel throws {@code UnsupportedOperationException}. |
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|
397 |
* The default provider is required to support the creation of asynchronous |
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changeset
|
398 |
* file channels. When not overridden, the default implementation of this |
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|
399 |
* method throws {@code UnsupportedOperationException}. |
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changeset
|
400 |
* |
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|
401 |
* @param path |
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|
402 |
* The path of the file to open or create |
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|
403 |
* @param options |
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|
404 |
* Options specifying how the file is opened |
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|
405 |
* @param executor |
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|
406 |
* The thread pool or {@code null} to associate the channel with |
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|
407 |
* the default thread pool |
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|
408 |
* @param attrs |
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|
409 |
* An optional list of file attributes to set atomically when |
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|
410 |
* creating the file |
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diff
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|
411 |
* |
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diff
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|
412 |
* @return A new asynchronous file channel |
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parents:
diff
changeset
|
413 |
* |
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diff
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|
414 |
* @throws IllegalArgumentException |
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|
415 |
* If the set contains an invalid combination of options |
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|
416 |
* @throws UnsupportedOperationException |
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|
417 |
* If this provider that does not support creating asynchronous file |
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diff
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|
418 |
* channels, or an unsupported open option or file attribute is |
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alanb
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diff
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|
419 |
* specified |
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|
420 |
* @throws IOException |
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|
421 |
* If an I/O error occurs |
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|
422 |
* @throws SecurityException |
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|
423 |
* In the case of the default file system, the {@link |
3acf8e5e2ca0
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alanb
parents:
diff
changeset
|
424 |
* SecurityManager#checkRead(String)} method is invoked to check |
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alanb
parents:
diff
changeset
|
425 |
* read access if the file is opened for reading. The {@link |
3acf8e5e2ca0
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alanb
parents:
diff
changeset
|
426 |
* SecurityManager#checkWrite(String)} method is invoked to check |
3acf8e5e2ca0
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alanb
parents:
diff
changeset
|
427 |
* write access if the file is opened for writing |
3acf8e5e2ca0
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alanb
parents:
diff
changeset
|
428 |
*/ |
3acf8e5e2ca0
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alanb
parents:
diff
changeset
|
429 |
public AsynchronousFileChannel newAsynchronousFileChannel(Path path, |
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alanb
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diff
changeset
|
430 |
Set<? extends OpenOption> options, |
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alanb
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diff
changeset
|
431 |
ExecutorService executor, |
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alanb
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diff
changeset
|
432 |
FileAttribute<?>... attrs) |
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alanb
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diff
changeset
|
433 |
throws IOException |
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alanb
parents:
diff
changeset
|
434 |
{ |
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alanb
parents:
diff
changeset
|
435 |
throw new UnsupportedOperationException(); |
3acf8e5e2ca0
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alanb
parents:
diff
changeset
|
436 |
} |
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alanb
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diff
changeset
|
437 |
} |