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

    // Run in threads, to avoid startup delay caused by network problems.
    new Thread() {
      public void run() {
        try {
          if(bForce) {
            Preferences prefs = Preferences.userNodeForPackage(getClass());
            prefs.remove(KEY_UPDATEVERSION);
            prefs.flush();
          }


          String versionURL =
            Util.getProperty("org.knopflerfish.desktop.releasenotesurl",
                             "http://www.knopflerfish.org/releases/current/release_notes.txt");

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  }


  static final String KEY_UPDATEVERSION = "updateVersion";


 void showUpdate(Version sysVersion, Version version, String notes) {
   Preferences prefs = Preferences.userNodeForPackage(getClass());


   Activator.log.info("showUpdate sysVersion=" + sysVersion + ", version=" + version);
   try {
     String prefsVersionS = prefs.get(KEY_UPDATEVERSION, "");
     if(prefsVersionS != null && !"".equals(prefsVersionS)) {
       Version prefsVersion = new Version(prefsVersionS);
       Activator.log.info("prefsVersion=" + prefsVersion);
       if(prefsVersion.compareTo(version) >= 0) {
         Activator.log.info("skip showUpdate " + version);
         return;
       }
     }
   } catch (Exception e) {
     Activator.log.warn("Failed to compare prefs version", e);
   }


   JTextPane html = new JTextPane();


    html.setContentType("text/html");


    html.setEditable(false);


    html.setText("<pre>\n" +
                 notes +
                 "\n</pre>");


    final JScrollPane scroll = new JScrollPane(html);
    scroll.setPreferredSize(new Dimension(500, 300));
    SwingUtilities.invokeLater(new Runnable() {
        public void run() {
          JViewport vp = scroll.getViewport();
          if(vp != null) {
            vp.setViewPosition(new Point(0,0));
            scroll.setViewport(vp);
          }
        }
      });


    JOptionPane.showMessageDialog(frame,
                                  scroll,
                                  "Update available",
                                  JOptionPane.INFORMATION_MESSAGE,
                                  null);


    try {
      prefs.put(KEY_UPDATEVERSION, version.toString());
      Activator.log.info("saved version " + version);
      prefs.flush();
    } catch (Exception e) {
      Activator.log.warn("Failed to store prefs", e);
    }
 }

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    this.preferencesFolder = preferencesFolder;
    this.applicationFolders = applicationFolders;
    
    updateSupportedLanguages();


    Preferences preferences;
    // From version 3.0 use portable preferences
    PortablePreferences portablePreferences = new PortablePreferences();    
    // If portable preferences storage doesn't exist and default preferences folder is used
    if (!portablePreferences.exist()
        && preferencesFolder == null) {
      // Retrieve preferences from pre version 3.0
      preferences = getPreferences();
    } else {
      preferences = portablePreferences;
    }
    
    setLanguage(preferences.get(LANGUAGE, getLanguage()));    
    
    // Fill default furniture catalog 
    setFurnitureCatalog(new DefaultFurnitureCatalog(this, getFurnitureLibrariesPluginFolders()));
    // Read additional furniture
    readFurnitureCatalog(preferences);
    
    // Fill default textures catalog 
    setTexturesCatalog(new DefaultTexturesCatalog(this, getTexturesLibrariesPluginFolders()));
    // Read additional textures
    readTexturesCatalog(preferences);


    DefaultUserPreferences defaultPreferences = new DefaultUserPreferences();
    // Share same language settings 
    defaultPreferences.setLanguage(getLanguage());
    
    // Fill default patterns catalog 
    PatternsCatalog patternsCatalog = defaultPreferences.getPatternsCatalog();
    setPatternsCatalog(patternsCatalog);


    // Read other preferences 
    setUnit(LengthUnit.valueOf(preferences.get(UNIT, 
        defaultPreferences.getLengthUnit().name())));
    setFurnitureCatalogViewedInTree(preferences.getBoolean(FURNITURE_CATALOG_VIEWED_IN_TREE, 
        defaultPreferences.isFurnitureCatalogViewedInTree()));
    setNavigationPanelVisible(preferences.getBoolean(NAVIGATION_PANEL_VISIBLE, 
        defaultPreferences.isNavigationPanelVisible()));
    setMagnetismEnabled(preferences.getBoolean(MAGNETISM_ENABLED, true));
    setRulersVisible(preferences.getBoolean(RULERS_VISIBLE, 
        defaultPreferences.isRulersVisible()));
    setGridVisible(preferences.getBoolean(GRID_VISIBLE, 
        defaultPreferences.isGridVisible()));
    setFurnitureViewedFromTop(preferences.getBoolean(FURNITURE_VIEWED_FROM_TOP, 
        defaultPreferences.isFurnitureViewedFromTop()));
    setFloorColoredOrTextured(preferences.getBoolean(ROOM_FLOOR_COLORED_OR_TEXTURED, 
        defaultPreferences.isRoomFloorColoredOrTextured()));
    try {
      setWallPattern(patternsCatalog.getPattern(preferences.get(WALL_PATTERN, 
          defaultPreferences.getWallPattern().getName())));
    } catch (IllegalArgumentException ex) {
      // Ensure wall pattern always exists even if new patterns are added in future versions
      setWallPattern(defaultPreferences.getWallPattern());
    }
    setNewWallThickness(preferences.getFloat(NEW_WALL_THICKNESS, 
        defaultPreferences.getNewWallThickness()));
    setNewWallHeight(preferences.getFloat(NEW_WALL_HEIGHT,
        defaultPreferences.getNewWallHeight()));    
    setAutoSaveDelayForRecovery(preferences.getInt(AUTO_SAVE_DELAY_FOR_RECOVERY,
        defaultPreferences.getAutoSaveDelayForRecovery()));    
    setCurrency(defaultPreferences.getCurrency());    
    // Read recent homes list
    List<String> recentHomes = new ArrayList<String>();
    for (int i = 1; i <= getRecentHomesMaxCount(); i++) {
      String recentHome = preferences.get(RECENT_HOMES + i, null);
      if (recentHome != null) {
        recentHomes.add(recentHome);
      }
    }
    setRecentHomes(recentHomes);
    // Read ignored action tips
    for (int i = 1; ; i++) {
      String ignoredActionTip = preferences.get(IGNORED_ACTION_TIP + i, "");
      if (ignoredActionTip.length() == 0) {
        break;
      } else {
        this.ignoredActionTips.put(ignoredActionTip, true);
      }

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  /**
   * Writes user preferences in current user preferences in system.
   */
  @Override
  public void write() throws RecorderException {
    Preferences preferences = getPreferences();
    writeFurnitureCatalog(preferences);
    writeTexturesCatalog(preferences);


    // Write other preferences 
    preferences.put(LANGUAGE, getLanguage());
    preferences.put(UNIT, getLengthUnit().name());   
    preferences.putBoolean(FURNITURE_CATALOG_VIEWED_IN_TREE, isFurnitureCatalogViewedInTree());
    preferences.putBoolean(NAVIGATION_PANEL_VISIBLE, isNavigationPanelVisible());
    preferences.putBoolean(MAGNETISM_ENABLED, isMagnetismEnabled());
    preferences.putBoolean(RULERS_VISIBLE, isRulersVisible());
    preferences.putBoolean(GRID_VISIBLE, isGridVisible());
    preferences.putBoolean(FURNITURE_VIEWED_FROM_TOP, isFurnitureViewedFromTop());
    preferences.putBoolean(ROOM_FLOOR_COLORED_OR_TEXTURED, isRoomFloorColoredOrTextured());
    preferences.put(WALL_PATTERN, getWallPattern().getName());
    preferences.putFloat(NEW_WALL_THICKNESS, getNewWallThickness());   
    preferences.putFloat(NEW_WALL_HEIGHT, getNewWallHeight());
    preferences.putInt(AUTO_SAVE_DELAY_FOR_RECOVERY, getAutoSaveDelayForRecovery());
    // Write recent homes list
    int i = 1;
    for (Iterator<String> it = getRecentHomes().iterator(); it.hasNext() && i <= getRecentHomesMaxCount(); i ++) {
      preferences.put(RECENT_HOMES + i, it.next());
    }
    // Remove obsolete keys
    for ( ; i <= getRecentHomesMaxCount(); i++) {
      preferences.remove(RECENT_HOMES + i);
    }
    // Write ignored action tips
    i = 1;
    for (Iterator<Map.Entry<String, Boolean>> it = this.ignoredActionTips.entrySet().iterator();
         it.hasNext(); ) {
      Entry<String, Boolean> ignoredActionTipEntry = it.next();
      if (ignoredActionTipEntry.getValue()) {
        preferences.put(IGNORED_ACTION_TIP + i++, ignoredActionTipEntry.getKey());
      } 
    }
    // Remove obsolete keys
    for ( ; i <= this.ignoredActionTips.size(); i++) {
      preferences.remove(IGNORED_ACTION_TIP + i);
    }
    
    try {
      // Write preferences 
      preferences.flush();
    } catch (BackingStoreException ex) {
      throw new RecorderException("Couldn't write preferences", ex);
    }
  }

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   * @return data.sprites.monsters.FileTree
   */
  private FileTree getJTree() {
    if (jTree == null) {
      try {
        final Preferences pref = Preferences.userNodeForPackage(AnimationRunner.class);
        File lastDirectory = null;
        if (pref.get("lastpath", null) != null) {
          lastDirectory = new File(pref.get("lastpath", null));


        }


        final JFileChooser fc = new JFileChooser(lastDirectory);

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      System.setProperty("JDBCPreferences.driverName", getManager().getCurrentProperty("Pooka._jdbcWizard.selection.driver", ""));
      System.setProperty("JDBCPreferences.url",  getManager().getCurrentProperty("Pooka._jdbcWizard.selection.url", ""));
      System.setProperty("JDBCPreferences.user",  getManager().getCurrentProperty("Pooka._jdbcWizard.selection.user", ""));
      System.setProperty("JDBCPreferences.password",  net.suberic.util.gui.propedit.PasswordEditorPane.descrambleString(getManager().getCurrentProperty("Pooka._jdbcWizard.selection.password", "")));
      Preferences p = Preferences.userNodeForPackage(this.getClass());
      p.keys();
      System.setProperty("useJdbcConnection", "true");
    } catch (Exception e) {
      throw new PropertyValueVetoException("Pooka._jdbcWizard.selection.driver", getManager().getCurrentProperty("Pooka._jdbcWizard.selection.driver", ""), e.getMessage(), null);
    }
  }

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            tcm.getColumn(i).addPropertyChangeListener(pcl);
        }
    }


    static void setPreference(final String name, final Object value, final boolean flush) {
        Preferences prefs = getPreferences();
        try {
            prefs.sync();
            if (value instanceof Long) {
                prefs.putLong(name, (Long) value);
            } else if (value instanceof Integer) {
                prefs.putInt(name, (Integer) value);
            } else if (value instanceof int[]) {
                String string = null;
                for (int val : (int[]) value) {
                    if (string == null) {
                        string = String.valueOf(val);
                    } else {
                        string += "," + val;
                    }
                }
                prefs.put(name, string);
            } else if (value != null) {
                prefs.put(name, value.toString());
            }


            if (flush) {
                prefs.flush();
            }
        } catch (BackingStoreException ioe) {
            // ignore
        }
    }

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            // ignore
        }
    }


    static int getPreference(final String name, final int defaultValue) {
        Preferences prefs = getPreferences();
        try {
            prefs.sync();
            return prefs.getInt(name, defaultValue);
        } catch (BackingStoreException ioe) {
            // ignore
        }
        return defaultValue;
    }

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        }
        return defaultValue;
    }


    static int[] getPreference(final String name, final int[] defaultValues) {
        Preferences prefs = getPreferences();
        try {
            prefs.sync();
            String value = prefs.get(name, null);
            if (value != null) {
                String[] values = value.split(",");
                int[] result = new int[values.length];
                for (int i = 0; i < values.length; i++) {
                    result[i] = Integer.parseInt(values[i]);

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            if ( oldCacheFiles != null )
                for ( int i = 0; i < oldCacheFiles.length; i++ )
                    oldCacheFiles[i].delete();


            int defaultMemorySize = MemoryLimits.getDefault();
            Preferences prefs = Preferences.userRoot().node("/com/lightcrafts/app");
            long maxMemory = (long) prefs.getInt("MaxMemory", defaultMemorySize) * 1024 * 1024;
            long maxHeap = Runtime.getRuntime().maxMemory();
            long extraCaheSize = (maxMemory - maxHeap)/(1024 * 1024);


            System.out.println("Allocating " + extraCaheSize + "MB for the image cache.");

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