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

class StartupCrash {


    private final static String StartupKey = "StartupSuccessful";


    static void startupStarted() {
        Preferences prefs = Preferences.userRoot().node("/com/lightcrafts/app");
        prefs.putBoolean(StartupKey, false);
        try {
            prefs.sync();
        }
        catch (BackingStoreException e) {
            System.err.println("Couldn't access Preferences in StartupCrash");
            e.printStackTrace();
        }

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        }
        // Just let startup continue; maybe we'll get lucky.
    }


    static void startupEnded() {
        Preferences prefs = Preferences.userRoot().node("/com/lightcrafts/app");
        prefs.putBoolean(StartupKey, true);
    }

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        Preferences prefs = Preferences.userRoot().node("/com/lightcrafts/app");
        prefs.putBoolean(StartupKey, true);
    }


    static void checkLastStartupSuccessful() {
        Preferences prefs = Preferences.userRoot().node("/com/lightcrafts/app");
        boolean wasSuccessful = prefs.getBoolean(StartupKey, true);
        if (! wasSuccessful) {
            JButton help = new JButton(LOCALE.get("StartupErrorHelpOption"));
            help.addActionListener(
                new ActionListener() {
                    public void actionPerformed(ActionEvent event) {
                        showHelpDialog();
                    }
                }
            );
            JTextArea text = createText(LOCALE.get("StartupErrorMessage"));
            int option = JOptionPane.showOptionDialog(
                null,
                text,
                LOCALE.get("StartupErrorDialogTitle"),
                JOptionPane.OK_OPTION,
                JOptionPane.WARNING_MESSAGE,
                null,
                new Object[] {
                    help,
                    LOCALE.get("StartupErrorResetOption"),
                    LOCALE.get("StartupErrorDontResetOption")
                },
                LOCALE.get("StartupErrorDontResetOption")
            );
            if (option == 1) {
                text = createText(LOCALE.get("ResetWarningMajor"));
                option = JOptionPane.showOptionDialog(
                    null,
                    text,
                    LOCALE.get("ResetDialogTitle"),
                    JOptionPane.OK_CANCEL_OPTION,
                    JOptionPane.WARNING_MESSAGE,
                    null,
                    new Object[] {
                        help,
                        LOCALE.get("StartupErrorResetOption"),
                        LOCALE.get("StartupErrorDontResetOption")
                    },
                    LOCALE.get("StartupErrorDontResetOption")
                );
                if (option == 1) {
                    boolean success = true;
                    try {
                        Preferences root = Preferences.userRoot();
                        Preferences node = root.node("/com/lightcrafts");
                        node.removeNode();
                    }
                    catch (BackingStoreException e) {
                        System.err.println(
                            "StartupCrash failed to reset Preferences"
                        );

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        if (option == 1) {
            boolean success = true;
            try {
                // On Linux, the license state resides in preferences.
                Object licenseState = DummyLicenseLibrary.getLicenseState();
                Preferences root = Preferences.userRoot();
                Preferences node = root.node("/com/lightcrafts");
                node.removeNode();
                node.flush();
                if (licenseState != null) {
                    DummyLicenseLibrary.setLicenseState(licenseState);
                }
            }
            catch (BackingStoreException e) {

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    public FileChooser getFileChooser() {
        return new LinuxFileChooser();
    }


    public ICC_Profile getDisplayProfile() {
        Preferences prefs = Preferences.userRoot().node(
            "/com/lightcrafts/platform/linux"
        );
        String path = prefs.get("DisplayProfile", null);
        if (path != null) {
            try {
                return ICC_Profile.getInstance(path);
            }
            catch (Throwable e) {

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        restoreLayout();


        // The first time this layout is used, initialize the middle split
        // pane divider (between the thumbnails and the preview area).
        String firstLayoutTag = "FirstLayout";
        Preferences prefs = Preferences.userNodeForPackage(BrowserLayout.class);
        boolean isFirstLayout = prefs.getBoolean(firstLayoutTag, true);
        if (isFirstLayout) {
            // Must enqueue, because the JSplitPane API requires the location
            // to be specified relative to the top of the component, we
            // want to specify relative to the bottom, and so we can only
            // do this after the component size has been determined.
            EventQueue.invokeLater(
                new Runnable() {
                    public void run() {
                        Dimension size = middleSplit.getSize();
                        // The number, 220, is coupled with the thumbnail
                        // size initialization in SizeSlider.
                        middleSplit.setDividerLocation(size.height - 220);
                    }
                }
            );
            prefs.putBoolean(firstLayoutTag, false);
        }
        HelpButton help = new HelpButton();
        help.setAlignmentX(1f);


        setLayout(new BorderLayout());

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//    }
//  }
  
  public void refillConfigs()
  {
    final Preferences  childPrefs;
    final String[]    cfgIDs;
    Preferences      cfgPrefs;
    
    try {
      childPrefs  = audioPrefs.node( NODE_CONF );
      cfgIDs    = childPrefs.childrenNames();
      ggRecordConfig.removeAllItems();
      for( int i = 0; i < cfgIDs.length; i++ ) {
        cfgPrefs  = childPrefs.node( cfgIDs[ i ]);
        if( cfgPrefs.getInt( RoutingConfig.KEY_RC_NUMCHANNELS, -1 ) == numChannels ) {
          ggRecordConfig.addItem( new StringItem( cfgIDs[ i ], cfgPrefs.get( RoutingConfig.KEY_NAME, cfgIDs[ i ])));
        }
      }
    }
    catch( BackingStoreException e1 ) {
      System.err.println( e1.getClass().getName() + " : " + e1.getLocalizedMessage() );

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  /*
   */
  private void initBounds()
  {
    final Preferences      cp  = getClassPrefs();
    final BasicWindowHandler  bwh  = getWindowHandler();
    final Rectangle        sr  = bwh.getWindowSpace();
    final Dimension        dt  = stringToDimension( cp.get( KEY_TRACKSIZE, null ));
    final Dimension        d  = dt == null ? new Dimension() : dt;
    final float          hf  = (float) Math.sqrt( Math.max( 1, waveView.getNumChannels() ));
    final Dimension        winSize;
    final Rectangle        wr;
    int              w  = d.width;
    int              h  = d.height;
    sr.x    += 36;
    sr.y    += 36;
    sr.width  -= 60;
    sr.height  -= 60;
    if( w <= 0 ) {
      w = sr.width*2/3 - AudioTrackRowHeader.ROW_WIDTH;
    }
    if( h <= 0 ) {
      h = (sr.height - 106) / 4; // 106 = approx. extra space for title bar, tool bar etc. 
    }
//System.out.println( "read KEY_TRACKSIZE : " + d );
//System.out.println( "w " + w + "; h " + h + "; hf " + hf );
    waveView.setPreferredSize( new Dimension( w, (int) (h * hf + 0.5f) ));
    pack();
    winSize = getSize();
    wr = new Rectangle( lastLeftTop.x + 21, lastLeftTop.y + 23,
        winSize.width, winSize.height );
    GUIUtil.wrapWindowBounds( wr, sr );
    lastLeftTop.setLocation( wr.getLocation() );
    setBounds( wr );
//System.out.println( "winSize " + winSize + "; wr " + wr );
    waveView.addComponentListener( new ComponentAdapter() {
      public void componentResized( ComponentEvent e )
      {
        if( waveExpanded ) {
          final Dimension dNew = e.getComponent().getSize();
          dNew.height = (int) (dNew.height / hf + 0.5f);
          if( !dNew.equals( d )) {
//System.out.println( "write KEY_TRACKSIZE : " + dNew );
            d.setSize( dNew );
            cp.put( KEY_TRACKSIZE, AppWindow.dimensionToString( dNew ));
          }
        }
      }
    });
  }

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  {
    collConfigs[ id ].clear();
    setConfigNames[ id ].clear();
    setConfigIDs[ id ].clear();
    
    final Preferences  ocPrefs    = audioPrefs.node( KEY_PREFSNODE[ id ]);
    final String[]    arrayNames;
    RoutingConfig    cfg;
    Preferences      cfgPrefs;


    try {
      arrayNames = ocPrefs.childrenNames();
//System.err.println( "Got "+arrayNames.length+" children . " );
    }

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    }
  }
  
  protected boolean toPrefs( int id )
  {
    final Preferences  ocPrefs    = audioPrefs.node( KEY_PREFSNODE[ id ]);
//    final String[]    arrayNames;
    RoutingConfig    cfg;
    Preferences      cfgPrefs;
    String        cfgID;


    try {
//      arrayNames = ocPrefs.childrenNames();
//      for( int i = 0; i < arrayNames.length; i++ ) {
//        cfgPrefs = ocPrefs.node( arrayNames[ i ]);
//        cfgPrefs.removeNode();
////System.err.println( "removing "+arrayNames[ i ]);
//      }
    
      for( int i = 0; i < collConfigs[ id ].size(); i++ ) {
        cfg = (RoutingConfig) collConfigs[ id ].get( i );
        if( setDirtyConfigs[ id ].remove( cfg.id )) {
          cfgPrefs  = ocPrefs.node( cfg.id );
          cfg.toPrefs( cfgPrefs );
//System.err.println( "adding / updating "+cfg.id + " (" + cfg.name + ")" );
        }
      }
      
      for( Iterator iter = setDirtyConfigs[ id ].iterator(); iter.hasNext(); ) {
        cfgID = (String) iter.next();
        cfgPrefs = ocPrefs.node(cfgID );
        cfgPrefs.removeNode();
//System.err.println( "removing "+cfgID );
      }
      
      ocPrefs.flush();
    }

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