author | alanb |
Sun, 15 Feb 2009 12:25:54 +0000 | |
changeset 2057 | 3acf8e5e2ca0 |
child 3065 | 452aaa2899fc |
permissions | -rw-r--r-- |
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/* |
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* Copyright 2008-2009 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 sun.nio.fs; |
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|
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import java.nio.file.*; |
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import java.nio.file.attribute.*; |
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import java.nio.channels.*; |
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import java.util.*; |
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import java.io.IOException; |
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import java.security.AccessController; |
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import java.security.PrivilegedAction; |
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/** |
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* Base implementation of FileStore for Unix/like implementations. |
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*/ |
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abstract class UnixFileStore |
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extends FileStore |
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{ |
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// original path of file that identified file system |
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private final UnixPath file; |
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// device ID |
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private final long dev; |
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// entry in the mount tab |
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private final UnixMountEntry entry; |
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|
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// return the device ID where the given file resides |
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private static long devFor(UnixPath file) throws IOException { |
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try { |
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return UnixFileAttributes.get(file, true).dev(); |
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} catch (UnixException x) { |
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x.rethrowAsIOException(file); |
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return 0L; // keep compiler happy |
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} |
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} |
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UnixFileStore(UnixPath file) throws IOException { |
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this.file = file; |
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this.dev = devFor(file); |
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this.entry = findMountEntry(); |
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} |
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UnixFileStore(UnixFileSystem fs, UnixMountEntry entry) throws IOException { |
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this.file = new UnixPath(fs, entry.dir()); |
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this.dev = (entry.dev() == 0L) ? devFor(this.file) : entry.dev(); |
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this.entry = entry; |
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} |
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/** |
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* Find the mount entry for the file store |
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*/ |
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abstract UnixMountEntry findMountEntry() throws IOException; |
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/** |
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* Returns true if this file store represents a loopback file system that |
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* will have the same device ID as undelrying file system. |
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*/ |
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abstract boolean isLoopback(); |
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UnixPath file() { |
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return file; |
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} |
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long dev() { |
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return dev; |
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} |
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UnixMountEntry entry() { |
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return entry; |
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} |
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@Override |
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public String name() { |
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return entry.name(); |
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} |
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@Override |
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public String type() { |
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return entry.fstype(); |
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} |
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@Override |
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public boolean isReadOnly() { |
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return entry.isReadOnly(); |
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} |
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@Override |
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@SuppressWarnings("unchecked") |
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public <V extends FileStoreAttributeView> V getFileStoreAttributeView(Class<V> viewType) |
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{ |
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if (viewType == FileStoreSpaceAttributeView.class) |
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return (V) new UnixFileStoreSpaceAttributeView(this); |
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return (V) null; |
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119 |
} |
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120 |
|
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121 |
@Override |
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public FileStoreAttributeView getFileStoreAttributeView(String name) { |
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if (name.equals("space")) |
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return new UnixFileStoreSpaceAttributeView(this); |
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125 |
return null; |
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126 |
} |
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127 |
|
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128 |
@Override |
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public boolean supportsFileAttributeView(Class<? extends FileAttributeView> type) { |
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if (type == BasicFileAttributeView.class) |
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return true; |
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132 |
if (type == PosixFileAttributeView.class || |
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type == FileOwnerAttributeView.class) |
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134 |
{ |
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// lookup fstypes.properties |
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FeatureStatus status = checkIfFeaturePresent("posix"); |
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if (status == FeatureStatus.NOT_PRESENT) |
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return false; |
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139 |
return true; |
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140 |
} |
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141 |
return false; |
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142 |
} |
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143 |
|
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144 |
@Override |
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145 |
public boolean supportsFileAttributeView(String name) { |
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146 |
if (name.equals("basic") || name.equals("unix")) |
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147 |
return true; |
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148 |
if (name.equals("posix")) |
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149 |
return supportsFileAttributeView(PosixFileAttributeView.class); |
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150 |
if (name.equals("owner")) |
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|
151 |
return supportsFileAttributeView(FileOwnerAttributeView.class); |
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152 |
return false; |
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153 |
} |
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|
154 |
|
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|
155 |
@Override |
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156 |
public boolean equals(Object ob) { |
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|
157 |
if (ob == this) |
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|
158 |
return true; |
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|
159 |
if (!(ob instanceof UnixFileStore)) |
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|
160 |
return false; |
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161 |
UnixFileStore other = (UnixFileStore)ob; |
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|
162 |
if (dev != other.dev) |
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|
163 |
return false; |
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|
164 |
// deviceIDs are equal but they may not be equal if one or both of |
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165 |
// them is a loopback file system |
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|
166 |
boolean thisIsLoopback = isLoopback(); |
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|
167 |
if (thisIsLoopback != other.isLoopback()) |
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|
168 |
return false; // one, but not both, are lofs |
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|
169 |
if (!thisIsLoopback) |
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170 |
return true; // neither is lofs |
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|
171 |
// both are lofs so compare mount points |
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|
172 |
return Arrays.equals(this.entry.dir(), other.entry.dir()); |
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|
173 |
} |
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|
174 |
|
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|
175 |
@Override |
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|
176 |
public int hashCode() { |
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|
177 |
return (int)(dev ^ (dev >>> 32)); |
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|
178 |
} |
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|
179 |
|
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|
180 |
@Override |
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|
181 |
public String toString() { |
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|
182 |
StringBuilder sb = new StringBuilder(new String(entry.dir())); |
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|
183 |
sb.append(" ("); |
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|
184 |
sb.append(entry.name()); |
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|
185 |
sb.append(")"); |
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|
186 |
return sb.toString(); |
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|
187 |
} |
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|
188 |
|
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|
189 |
private static class UnixFileStoreSpaceAttributeView |
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|
190 |
extends AbstractFileStoreSpaceAttributeView |
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|
191 |
{ |
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|
192 |
private final UnixFileStore fs; |
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|
193 |
|
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|
194 |
UnixFileStoreSpaceAttributeView(UnixFileStore fs) { |
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|
195 |
this.fs = fs; |
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|
196 |
} |
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|
197 |
|
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|
198 |
@Override |
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|
199 |
public FileStoreSpaceAttributes readAttributes() |
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|
200 |
throws IOException |
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|
201 |
{ |
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|
202 |
UnixPath file = fs.file(); |
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|
203 |
final UnixFileStoreAttributes attrs; |
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|
204 |
try { |
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|
205 |
attrs = UnixFileStoreAttributes.get(file); |
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|
206 |
} catch (UnixException x) { |
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|
207 |
x.rethrowAsIOException(file); |
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|
208 |
return null; // keep compile happy |
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|
209 |
} |
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|
210 |
|
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|
211 |
return new FileStoreSpaceAttributes() { |
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|
212 |
@Override |
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|
213 |
public long totalSpace() { |
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|
214 |
return attrs.blockSize() * attrs.totalBlocks(); |
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|
215 |
} |
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|
216 |
@Override |
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|
217 |
public long usableSpace() { |
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|
218 |
return attrs.blockSize() * attrs.availableBlocks(); |
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|
219 |
} |
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|
220 |
@Override |
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|
221 |
public long unallocatedSpace() { |
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|
222 |
return attrs.blockSize() * attrs.freeBlocks(); |
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|
223 |
} |
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|
224 |
}; |
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|
225 |
} |
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|
226 |
} |
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|
227 |
|
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|
228 |
// -- fstypes.properties -- |
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|
229 |
|
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|
230 |
private static final Object loadLock = new Object(); |
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|
231 |
private static volatile Properties props; |
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|
232 |
|
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|
233 |
enum FeatureStatus { |
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|
234 |
PRESENT, |
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|
235 |
NOT_PRESENT, |
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UNKNOWN; |
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} |
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|
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/** |
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* Returns status to indicate if file system supports a given feature |
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*/ |
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FeatureStatus checkIfFeaturePresent(String feature) { |
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if (props == null) { |
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synchronized (loadLock) { |
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if (props == null) { |
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props = AccessController.doPrivileged( |
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new PrivilegedAction<Properties>() { |
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@Override |
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public Properties run() { |
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return loadProperties(); |
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}}); |
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} |
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} |
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} |
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|
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String value = props.getProperty(type()); |
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if (value != null) { |
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String[] values = value.split("\\s"); |
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for (String s: values) { |
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s = s.trim().toLowerCase(); |
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if (s.equals(feature)) { |
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return FeatureStatus.PRESENT; |
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} |
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if (s.startsWith("no")) { |
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s = s.substring(2); |
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if (s.equals(feature)) { |
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return FeatureStatus.NOT_PRESENT; |
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} |
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} |
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} |
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} |
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return FeatureStatus.UNKNOWN; |
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} |
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|
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private static Properties loadProperties() { |
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Properties result = new Properties(); |
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String fstypes = System.getProperty("java.home") + "/lib/fstypes.properties"; |
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FileRef file = Paths.get(fstypes); |
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try { |
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ReadableByteChannel rbc = file.newByteChannel(); |
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try { |
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result.load(Channels.newReader(rbc, "UTF-8")); |
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} finally { |
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rbc.close(); |
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} |
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} catch (IOException x) { |
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} |
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return result; |
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} |
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} |