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Diffstat (limited to 'libjava/classpath/gnu/java/util/prefs/FileBasedPreferences.java')
| -rw-r--r-- | libjava/classpath/gnu/java/util/prefs/FileBasedPreferences.java | 273 |
1 files changed, 0 insertions, 273 deletions
diff --git a/libjava/classpath/gnu/java/util/prefs/FileBasedPreferences.java b/libjava/classpath/gnu/java/util/prefs/FileBasedPreferences.java deleted file mode 100644 index f89ed6be21e..00000000000 --- a/libjava/classpath/gnu/java/util/prefs/FileBasedPreferences.java +++ /dev/null @@ -1,273 +0,0 @@ -/* FileBasedPreferences.java -- File-based preference implementation - Copyright (C) 2006 Free Software Foundation, Inc. - -This file is part of GNU Classpath. - -GNU Classpath is free software; you can redistribute it and/or modify -it under the terms of the GNU General Public License as published by -the Free Software Foundation; either version 2, or (at your option) -any later version. - -GNU Classpath is distributed in the hope that it will be useful, but -WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU -General Public License for more details. - -You should have received a copy of the GNU General Public License -along with GNU Classpath; see the file COPYING. If not, write to the -Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA -02110-1301 USA. - -Linking this library statically or dynamically with other modules is -making a combined work based on this library. Thus, the terms and -conditions of the GNU General Public License cover the whole -combination. - -As a special exception, the copyright holders of this library give you -permission to link this library with independent modules to produce an -executable, regardless of the license terms of these independent -modules, and to copy and distribute the resulting executable under -terms of your choice, provided that you also meet, for each linked -independent module, the terms and conditions of the license of that -module. An independent module is a module which is not derived from -or based on this library. If you modify this library, you may extend -this exception to your version of the library, but you are not -obligated to do so. If you do not wish to do so, delete this -exception statement from your version. */ - - -package gnu.java.util.prefs; - -import gnu.classpath.SystemProperties; - -import java.io.File; -import java.io.FileInputStream; -import java.io.FileOutputStream; -import java.io.FilenameFilter; -import java.io.IOException; -import java.nio.channels.FileChannel; -import java.nio.channels.FileLock; -import java.util.Properties; -import java.util.prefs.AbstractPreferences; -import java.util.prefs.BackingStoreException; - -/** - * This is a simple file-based preference implementation which writes - * the preferences as properties files. A node is represented as a directory - * beneath the user's home directory. The preferences for the node are - * stored in a single properties file in that directory. Sub-nodes are - * stored in subdirectories. This implementation uses file locking to - * mediate access to the properties files. - */ -public class FileBasedPreferences - extends AbstractPreferences -{ - /** - * Name of the property file storing the data in a given directory. - */ - private static final String DATA_FILE = "data.properties"; - - /** - * The directory corresponding to this preference node. - */ - private File directory; - - /** - * The file holding the data for this node. - */ - private File dataFile; - - /** - * The data in this node. - */ - private Properties properties; - - /** - * Create the root node for the file-based preferences. - */ - FileBasedPreferences() - { - super(null, ""); - String home = SystemProperties.getProperty("user.home"); - this.directory = new File(new File(home, ".classpath"), "userPrefs"); - this.dataFile = new File(this.directory, DATA_FILE); - load(); - } - - /** - * Create a new file-based preference object with the given parent - * and the given name. - * @param parent the parent - * @param name the name of this node - */ - FileBasedPreferences(FileBasedPreferences parent, String name) - { - super(parent, name); - this.directory = new File(parent.directory, name); - this.dataFile = new File(this.directory, DATA_FILE); - load(); - } - - private void load() - { - this.properties = new Properties(); - FileInputStream fis = null; - FileLock lock = null; - try - { - fis = new FileInputStream(this.dataFile); - FileChannel channel = fis.getChannel(); - lock = channel.lock(0, Long.MAX_VALUE, true); - this.properties.load(fis); - // We release the lock and close the stream in the 'finally' - // clause. - } - catch (IOException _) - { - // We don't mind; this means we're making a new node. - newNode = true; - } - finally - { - try - { - // Release the lock and close the stream. - if (lock != null) - lock.release(); - } - catch (IOException ignore) - { - // Ignore. - } - try - { - // Close the stream. - if (fis != null) - fis.close(); - } - catch (IOException ignore) - { - // Ignore. - } - } - } - - public boolean isUserNode() - { - // For now file preferences are always user nodes. - return true; - } - - protected String[] childrenNamesSpi() throws BackingStoreException - { - // FIXME: security manager. - String[] result = directory.list(new FilenameFilter() - { - public boolean accept(File dir, String name) - { - return new File(dir, name).isDirectory(); - } - }); - if (result == null) - result = new String[0]; - return result; - } - - protected AbstractPreferences childSpi(String name) - { - return new FileBasedPreferences(this, name); - } - - protected String[] keysSpi() throws BackingStoreException - { - return (String[]) properties.keySet().toArray(new String[0]); - } - - protected String getSpi(String key) - { - return properties.getProperty(key); - } - - protected void putSpi(String key, String value) - { - properties.put(key, value); - } - - protected void removeSpi(String key) - { - properties.remove(key); - } - - protected void flushSpi() throws BackingStoreException - { - // FIXME: security manager. - try - { - if (isRemoved()) - { - // Delete the underlying file. - // FIXME: ideally we would also delete the directory - // if it had no subdirectories. This doesn't matter - // much though. - // FIXME: there's a strange race here if a different VM is - // simultaneously updating this node. - dataFile.delete(); - } - else - { - // Write the underlying file. - directory.mkdirs(); - - FileOutputStream fos = null; - FileLock lock = null; - try - { - // Note that we let IOExceptions from the try clause - // propagate to the outer 'try'. - fos = new FileOutputStream(dataFile); - FileChannel channel = fos.getChannel(); - lock = channel.lock(); - properties.store(fos, "created by GNU Classpath FileBasedPreferences"); - // Lock is released and file closed in the finally clause. - } - finally - { - try - { - if (lock != null) - lock.release(); - } - catch (IOException _) - { - // Ignore. - } - try - { - if (fos != null) - fos.close(); - } - catch (IOException _) - { - // Ignore. - } - } - } - } - catch (IOException ioe) - { - throw new BackingStoreException(ioe); - } - } - - protected void syncSpi() throws BackingStoreException - { - // FIXME: we ought to synchronize but instead we merely flush. - flushSpi(); - } - - protected void removeNodeSpi() throws BackingStoreException - { - // We can simply delegate. - flushSpi(); - } -} |