Examples of java.util.prefs.Preferences

java.util.prefs.Preferences
sun.com/dtd/preferences.dtd"> Note that the system URI (http://java.sun.com/dtd/preferences.dtd) is not accessed when exporting or importing preferences; it merely serves as a string to uniquely identify the DTD, which is:
```
 <?xml version="1.0" encoding="UTF-8"?>   <!ELEMENT preferences (root)>  <!ATTLIST preferences EXTERNAL_XML_VERSION CDATA "0.0" >    <!ELEMENT root (map, node*) >  <!ATTLIST root type (system|user) #REQUIRED >  <!ELEMENT node (map, node*) >  <!ATTLIST node name CDATA #REQUIRED >  <!ELEMENT map (entry*) >  <!ELEMENT entry EMPTY > <!ATTLIST entry key   CDATA #REQUIRED value CDATA #REQUIRED > 
```
Every Preferences implementation must have an associated {@link PreferencesFactory} implementation. Every Java(TM) SE implementation must providesome means of specifying which PreferencesFactory implementation is used to generate the root preferences nodes. This allows the administrator to replace the default preferences implementation with an alternative implementation.
Implementation note: In Sun's JRE, the PreferencesFactory implementation is located as follows:
1. If the system property java.util.prefs.PreferencesFactory is defined, then it is taken to be the fully-qualified name of a class implementing the PreferencesFactory interface. The class is loaded and instantiated; if this process fails then an unspecified error is thrown.
2. If a PreferencesFactory implementation class file has been installed in a jar file that is visible to the {@link java.lang.ClassLoader#getSystemClassLoader system class loader}, and that jar file contains a provider-configuration file named java.util.prefs.PreferencesFactory in the resource directory META-INF/services, then the first class name specified in that file is taken. If more than one such jar file is provided, the first one found will be used. The class is loaded and instantiated; if this process fails then an unspecified error is thrown.
3. Finally, if neither the above-mentioned system property nor an extension jar file is provided, then the system-wide default PreferencesFactory implementation for the underlying platform is loaded and instantiated.
@author Josh Bloch @version 1.30, 06/26/06 @since 1.4

      });
      if (pw != null) {
    userName = pw.getUserName();
    password = new String(pw.getPassword());
      } else {
    final Preferences prefs = Preferences.userRoot().node("/java/net/socks");
    try {
        userName = 
      (String) AccessController.doPrivileged(
             new java.security.PrivilegedExceptionAction() {
               public Object run() throws IOException {
             return prefs.get("username", null);
               }
           });
    } catch (java.security.PrivilegedActionException pae) {
        throw (IOException) pae.getException();
    }


    if (userName != null) {
        try {
      password = 
          (String) AccessController.doPrivileged(
           new java.security.PrivilegedExceptionAction() {
             public Object run() throws IOException {
                 return prefs.get("password", null);
             }
               });
        } catch (java.security.PrivilegedActionException pae) {
      throw (IOException) pae.getException();
        }

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   }




   private void initDlg()
   {
      Preferences userRoot = Preferences.userRoot();
    _dlg.txtFile.setText(userRoot.get(PREF_KEY_CSV_FILE, null));
      _dlg.charsets.setSelectedItem(userRoot.get(PREF_KEY_CSV_ENCODING, Charset.defaultCharset().name()));
      _dlg.chkWithHeaders.setSelected(userRoot.getBoolean(PREF_KEY_WITH_HEADERS, true));




      _dlg.chkSeparatorTab.setSelected(userRoot.getBoolean(PREF_KEY_SEPERATOR_TAB, false));


      if(false == _dlg.chkSeparatorTab.isSelected())
      {
         _dlg.txtSeparatorChar.setText(userRoot.get(PREF_KEY_SEPERATOR_CHAR, ","));
      }


      if(userRoot.getBoolean(PREF_KEY_FORMAT_CSV, true))
      {
         _dlg.radFormatCSV.setSelected(true);
      }
      else if(userRoot.getBoolean(PREF_KEY_FORMAT_XLS, false))
      {
         _dlg.radFormatXLS.setSelected(true);
      }
      else if(userRoot.getBoolean(PREF_KEY_FORMAT_XML, false))
      {
         _dlg.radFormatXML.setSelected(true);
      }
      else
      {
         _dlg.radFormatCSV.setSelected(true);
      }




      onFormat(false);






      if(userRoot.getBoolean(PREF_KEY_EXPORT_COMPLETE, true))
      {
         _dlg.radComplete.setSelected(true);
      }
      else
      {
         _dlg.radSelection.setSelected(true);
      }


      if(userRoot.getBoolean(PREF_KEY_USE_GLOBAL_PREFS_FORMATING, true))
      {
         _dlg.radUseGlobalPrefsFormating.setSelected(true);
      }
      else
      {
         _dlg.radUseDefaultFormating.setSelected(true);
      }




      _dlg.chkExecCommand.setSelected(userRoot.getBoolean(PREF_KEY_EXECUTE_COMMAND, false));
      onChkExecCommand();


      _dlg.txtCommand.setText(userRoot.get(PREF_KEY_COMMAND, "openoffice.org-2.0 -calc %file"));
      
      LineSeparator preferredLineSeparator = 
        LineSeparator.valueOf(userRoot.get(PREF_KEY_LINE_SEPERATOR, LineSeparator.DEFAULT.name()));
      
      _dlg._lineSeparators.setSelectedItem(preferredLineSeparator);
   }

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        public LabelPattern getKeyPattern(){


            keyPattern = new LabelPattern(KEY_PATTERN);
            Preferences pre = Preferences.userNodeForPackage
                (net.sf.jabref.labelPattern.LabelPattern.class);
            try {
                String[] keys = pre.keys();
            if (keys.length > 0) for (int i=0; i<keys.length; i++)
                keyPattern.addLabelPattern(keys[i], pre.get(keys[i], null));
            } catch (BackingStoreException ex) {
                Globals.logger("BackingStoreException in JabRefPreferences.getKeyPattern");
            }


            ///

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            LabelPattern parent = pattern.getParent();
            if (parent == null)
                return;


            // Store overridden definitions to Preferences.
            Preferences pre = Preferences.userNodeForPackage
                (net.sf.jabref.labelPattern.LabelPattern.class);
            try {
                pre.clear(); // We remove all old entries.
            } catch (BackingStoreException ex) {
                Globals.logger("BackingStoreException in JabRefPreferences.putKeyPattern");
            }


            for (String s: pattern.keySet()){
                if (!(pattern.get(s)).equals(parent.get(s)))
                    pre.put(s, pattern.getValue(s).get(0).toString());
            }
        }

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         */
        File newPrefDir = new File(ContextHolder.getContext().getConfDirectory(), "prefs");
        PREF = PropertyPreferences.SYSTEM_ROOT;
        try {
            if (!newPrefDir.exists() && Preferences.systemRoot().node("/com").nodeExists("adito")) {
                Preferences from = Preferences.systemRoot().node("/com/adito");
                log.warn("Migrating preferences");
                try {
                    copyNode(from.node("core"), PREF.node("core"));
                    from.node("core").removeNode();
                    copyNode(from.node("plugin"), PREF.node("plugin"));
                    from.node("plugin").removeNode();
                    copyNode(from.node("extensions"), PREF.node("extensions"));
                    from.node("extensions").removeNode();
                    copyNode(from.node("dbupgrader"), PREF.node("dbupgrader"));
                    from.node("dbupgrader").removeNode();
                } catch (Exception e) {
                    log.error("Failed to migrate preferences.", e);
                }
                try {
                    from.flush();
                } catch (BackingStoreException bse) {
                    log.error("Failed to flush old preferences");
                }
                try {
                    PREF.flush();

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        for (int i = 0; i < keys.length; i++) {
            to.put(keys[i], from.get(keys[i], ""));
        }
        String childNodes[] = from.childrenNames();
        for (int i = 0; i < childNodes.length; i++) {
            Preferences cn = from.node(childNodes[i]);
            Preferences tn = to.node(childNodes[i]);
            copyNode(cn, tn);
        }
    }

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        if (versionsFile == null) {
            /* If required, convert from the old preferences node to the new
             * file (version 0.2.5)
             */
            versionsFile = new File(ContextHolder.getContext().getDBDirectory(), "versions.log");
            Preferences p = ContextHolder.getContext().getPreferences().node("dbupgrader");
            if (p.nodeExists("currentDataVersion")) {
                log.warn("Migrating database versions from preferences to properties file in "
                                + ContextHolder.getContext().getDBDirectory().getAbsolutePath() + ".");
                versions = new Properties();
                p = p.node("currentDataVersion");
                String[] c = p.keys();
                for (int i = 0; i < c.length; i++) {
                    versions.put(c[i], p.get(c[i], ""));
                }
                FileOutputStream fos = new FileOutputStream(versionsFile);
                try {
                    versions.store(fos, "Database versions");
                } finally {
                    Util.closeStream(fos);
                }
                p.removeNode();
            }
        }


        // Load the database versions
        if (versions == null) {

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      final ServerSocket serverSocket;
      try {
        // Launch a server that waits for other Sweet Home 3D launches
        serverSocket = new ServerSocket(0, 0, InetAddress.getByName("127.0.0.1"));
        // Share server port in preferences
        Preferences preferences = Preferences.userNodeForPackage(this.mainClass);
        preferences.putInt(SINGLE_INSTANCE_PORT, serverSocket.getLocalPort());
        preferences.flush();
      } catch (IOException ex) {
        // Ignore exception, Sweet Home 3D will work with multiple instances
        return;
      } catch (BackingStoreException ex) {
        // Ignore exception, Sweet Home 3D will work with multiple instances

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    }


    public void removeSingleInstanceListener(SingleInstanceListener l) {
      this.singleInstanceListeners.remove(l);
      if (this.singleInstanceListeners.isEmpty()) {
        Preferences preferences = Preferences.userNodeForPackage(this.mainClass);
        preferences.remove(SINGLE_INSTANCE_PORT);
        try {
          preferences.flush();
        } catch (BackingStoreException ex) {
          throw new RuntimeException(ex);
        }
      }
    }

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     */
    public static boolean callSingleInstanceServer(String [] mainArgs, Class<?> mainClass) {
      if (!OperatingSystem.isMacOSX()) {
        // No server under Mac OS X, multiple application launches are managed
        // by com.apple.eawt.ApplicationListener in MacOSXConfiguration class
        Preferences preferences = Preferences.userNodeForPackage(mainClass);
        int singleInstancePort = preferences.getInt(SINGLE_INSTANCE_PORT, -1);
        if (singleInstancePort != -1) {
          try {
            // Try to connect to single instance server
            Socket socket = new Socket("127.0.0.1", singleInstancePort);
            // Write main args

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