author | alanb |
Sat, 19 Mar 2011 14:21:52 +0000 | |
changeset 8808 | fc799c458da8 |
parent 8158 | 77d9c0f1c19f |
child 9035 | 1255eb81cc2f |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2008, 2010, 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 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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// 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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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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// uses statvfs to read the file system information |
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private UnixFileStoreAttributes readAttributes() throws IOException { |
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try { |
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return UnixFileStoreAttributes.get(file); |
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} catch (UnixException x) { |
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x.rethrowAsIOException(file); |
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return null; // keep compile happy |
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} |
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} |
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@Override |
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public long getTotalSpace() throws IOException { |
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UnixFileStoreAttributes attrs = readAttributes(); |
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return attrs.blockSize() * attrs.totalBlocks(); |
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} |
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@Override |
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public long getUsableSpace() throws IOException { |
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UnixFileStoreAttributes attrs = readAttributes(); |
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return attrs.blockSize() * attrs.availableBlocks(); |
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} |
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@Override |
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public long getUnallocatedSpace() throws IOException { |
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UnixFileStoreAttributes attrs = readAttributes(); |
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return attrs.blockSize() * attrs.freeBlocks(); |
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} |
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@Override |
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public <V extends FileStoreAttributeView> V getFileStoreAttributeView(Class<V> view) |
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{ |
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if (view == null) |
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throw new NullPointerException(); |
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return (V) null; |
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} |
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@Override |
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public Object getAttribute(String attribute) throws IOException { |
8158 | 144 |
if (attribute.equals("totalSpace")) |
145 |
return getTotalSpace(); |
|
146 |
if (attribute.equals("usableSpace")) |
|
147 |
return getUsableSpace(); |
|
148 |
if (attribute.equals("unallocatedSpace")) |
|
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return getUnallocatedSpace(); |
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throw new UnsupportedOperationException("'" + attribute + "' not recognized"); |
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} |
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|
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@Override |
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public boolean supportsFileAttributeView(Class<? extends FileAttributeView> type) { |
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if (type == null) |
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throw new NullPointerException(); |
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if (type == BasicFileAttributeView.class) |
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return true; |
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if (type == PosixFileAttributeView.class || |
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type == FileOwnerAttributeView.class) |
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{ |
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// lookup fstypes.properties |
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FeatureStatus status = checkIfFeaturePresent("posix"); |
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// assume supported if UNKNOWN |
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return (status != FeatureStatus.NOT_PRESENT); |
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} |
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return false; |
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} |
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169 |
|
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@Override |
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public boolean supportsFileAttributeView(String name) { |
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if (name.equals("basic") || name.equals("unix")) |
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return true; |
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if (name.equals("posix")) |
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return supportsFileAttributeView(PosixFileAttributeView.class); |
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if (name.equals("owner")) |
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return supportsFileAttributeView(FileOwnerAttributeView.class); |
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return false; |
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} |
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180 |
|
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181 |
@Override |
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public boolean equals(Object ob) { |
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183 |
if (ob == this) |
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return true; |
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185 |
if (!(ob instanceof UnixFileStore)) |
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186 |
return false; |
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187 |
UnixFileStore other = (UnixFileStore)ob; |
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return (this.dev == other.dev) && |
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Arrays.equals(this.entry.dir(), other.entry.dir()); |
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} |
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191 |
|
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192 |
@Override |
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193 |
public int hashCode() { |
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return (int)(dev ^ (dev >>> 32)) ^ Arrays.hashCode(entry.dir()); |
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} |
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196 |
|
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197 |
@Override |
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198 |
public String toString() { |
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199 |
StringBuilder sb = new StringBuilder(new String(entry.dir())); |
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200 |
sb.append(" ("); |
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201 |
sb.append(entry.name()); |
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202 |
sb.append(")"); |
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|
203 |
return sb.toString(); |
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204 |
} |
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|
205 |
|
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206 |
// -- fstypes.properties -- |
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207 |
|
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208 |
private static final Object loadLock = new Object(); |
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209 |
private static volatile Properties props; |
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210 |
|
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211 |
enum FeatureStatus { |
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|
212 |
PRESENT, |
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213 |
NOT_PRESENT, |
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214 |
UNKNOWN; |
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215 |
} |
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|
216 |
|
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|
217 |
/** |
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218 |
* Returns status to indicate if file system supports a given feature |
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219 |
*/ |
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220 |
FeatureStatus checkIfFeaturePresent(String feature) { |
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221 |
if (props == null) { |
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222 |
synchronized (loadLock) { |
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223 |
if (props == null) { |
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224 |
props = AccessController.doPrivileged( |
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225 |
new PrivilegedAction<Properties>() { |
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226 |
@Override |
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227 |
public Properties run() { |
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228 |
return loadProperties(); |
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229 |
}}); |
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|
230 |
} |
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|
231 |
} |
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|
232 |
} |
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233 |
|
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234 |
String value = props.getProperty(type()); |
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235 |
if (value != null) { |
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236 |
String[] values = value.split("\\s"); |
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237 |
for (String s: values) { |
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238 |
s = s.trim().toLowerCase(); |
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239 |
if (s.equals(feature)) { |
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240 |
return FeatureStatus.PRESENT; |
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|
241 |
} |
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242 |
if (s.startsWith("no")) { |
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243 |
s = s.substring(2); |
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244 |
if (s.equals(feature)) { |
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245 |
return FeatureStatus.NOT_PRESENT; |
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|
246 |
} |
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|
247 |
} |
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|
248 |
} |
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|
249 |
} |
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|
250 |
return FeatureStatus.UNKNOWN; |
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|
251 |
} |
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252 |
|
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253 |
private static Properties loadProperties() { |
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|
254 |
Properties result = new Properties(); |
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|
255 |
String fstypes = System.getProperty("java.home") + "/lib/fstypes.properties"; |
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|
256 |
Path file = Paths.get(fstypes); |
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|
257 |
try { |
8158 | 258 |
try (ReadableByteChannel rbc = Files.newByteChannel(file)) { |
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259 |
result.load(Channels.newReader(rbc, "UTF-8")); |
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|
260 |
} |
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|
261 |
} catch (IOException x) { |
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|
262 |
} |
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263 |
return result; |
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|
264 |
} |
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|
265 |
} |