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

 */
public class DBBrowserConfig {
    
    public static File getLastDirectory() {
        try {
            Preferences preferences = Preferences.userNodeForPackage(DBBrowserConfig.class);
            if (preferences != null) {
                try {
                    preferences.sync();
                } catch (BackingStoreException e) {
                }
                String path = preferences.get("directory", null);
                if (path != null) {
                    return new File(path);
                }
            }
        } catch (SecurityException e) {

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        return null;
    }
    
    public static void setLastDirectory(File directory) {
        try {
            Preferences preferences = Preferences.userNodeForPackage(DBBrowserConfig.class);
            if (preferences != null && directory != null) {
                preferences.put("directory", directory.getAbsolutePath());
                try {
                    preferences.flush();
                } catch (BackingStoreException e) {
                }
            }
        } catch (SecurityException e) {
            //

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        }
    }


    public static void saveWindowSize(String windowName, Window w) {
        try {
            Preferences preferences = Preferences.userNodeForPackage(DBBrowserConfig.class);
            if (preferences != null && w != null) {
                preferences.put("window." + windowName + ".x", w.getLocation().x + "");
                preferences.put("window." + windowName + ".y", w.getLocation().y + "");
                preferences.put("window." + windowName + ".width", w.getSize().width + "");
                preferences.put("window." + windowName + ".height", w.getSize().height + "");
                try {
                    preferences.flush();
                } catch (BackingStoreException e) {
                }
            }
        } catch (SecurityException e) {
            //

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        }
    }


    public static void loadWindowSize(String windowName, Window window) {
        try {
            Preferences preferences = Preferences.userNodeForPackage(DBBrowserConfig.class);
            if (preferences != null && window != null) {
                try {
                    preferences.sync();
                } catch (BackingStoreException e) {
                }
                int x = preferences.getInt("window." + windowName + ".x", -1);
                int y = preferences.getInt("window." + windowName + ".y", -1);
                int w = preferences.getInt("window." + windowName + ".width", -1);
                int h = preferences.getInt("window." + windowName + ".height", -1);
                if (x >= 0 && w > 0) {
                    window.setSize(w, h);
                    window.setLocation(x, y);
                } else {
                    window.pack();

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    }


    public static void setRecentDBs(List<File> paths) {
        try {
            Preferences preferences = Preferences.userNodeForPackage(DBBrowserConfig.class);
            if (preferences != null && paths != null) {
                int i = 0;
                for (File path : paths) {
                    preferences.put("recent." + i, path.getAbsolutePath());
                    i++;
                }
                try {
                    preferences.flush();
                } catch (BackingStoreException e) {
                }
            }
        } catch (SecurityException e) {
        }

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    }


    public static List<File> getRecentDBs() {
        LinkedList<File> list = new LinkedList<File>();
        try {
            Preferences preferences = Preferences.userNodeForPackage(DBBrowserConfig.class);
            if (preferences != null) {
                try {
                    preferences.sync();
                } catch (BackingStoreException e) {
                }
                for (int i = 0; i < 5; i++) {
                    String path = preferences.get("recent." + i, null);
                    if (path == null) {
                        break;
                    }
                    list.add(new File(path));
                }

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      if(comp instanceof JComponent) {
        ((JComponent)comp).setPreferredSize(size);
      }
    }


    Preferences prefs = getPrefs();


    if(comp instanceof JFrame) {
      Toolkit tk = comp.getToolkit();
      if(tk.isFrameStateSupported(Frame.MAXIMIZED_VERT) ||
         tk.isFrameStateSupported(Frame.MAXIMIZED_HORIZ) ||
         tk.isFrameStateSupported(Frame.MAXIMIZED_BOTH)) {
        int state = prefs.getInt(KEY_STATE, Frame.NORMAL);
        ((Frame)comp).setExtendedState(state);
      }
      int x = prefs.getInt(KEY_X, 0);
      int y = prefs.getInt(KEY_Y, 0);
      // System.out.println("attach " + id + " pos=" + x + ", " + y);
      comp.setLocation(x, y);
    }


    if(comp instanceof JSplitPane) {
      JSplitPane split = (JSplitPane)comp;
      int pos = prefs.getInt(KEY_SPLITPOS, defSplit);
      if(pos != -1) {
        // System.out.println("attach " + id + " split=" + pos);
        split.setDividerLocation(pos);
        // Tell components that they may want to redo its layout
        Component parent = split.getParent();

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    store();
  }


  Preferences getPrefs() {
    Preferences prefsBase = Preferences.userNodeForPackage(getClass());


    String spid  = Activator.getBC().getProperty("org.osgi.provisioning.spid");
    if(spid == null) {
      spid = "default";
    }


    Preferences prefs     = prefsBase.node(NODE_NAME + "/" + spid + "/" + id);
    try {
      prefs.sync(); // Get the latest version of the node.
    } catch (Exception e) {
      errCount++;
      if(errCount < maxErr) {
        Activator.log.warn("Failed to get id=" + id, e);
      }

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  public void store() {
    Dimension size = comp.getSize();
    try {
      savedSize = new Dimension(size.width, size.height);
      Preferences prefs = getPrefs();




      if(comp instanceof JFrame) {
        Point p =  ((JFrame)comp).getLocationOnScreen();
        // System.out.println(id + ": store pos " + p);
        prefs.put(KEY_X, Integer.toString((int)p.getX()));
        prefs.put(KEY_Y, Integer.toString((int)p.getY()));


        Toolkit tk = Toolkit.getDefaultToolkit();
        if(tk.isFrameStateSupported(Frame.MAXIMIZED_VERT) ||
           tk.isFrameStateSupported(Frame.MAXIMIZED_HORIZ) ||
           tk.isFrameStateSupported(Frame.MAXIMIZED_BOTH)) {
          int state = ((Frame)comp).getExtendedState();
          prefs.put(KEY_STATE, Integer.toString(state));
        }


      }


      // System.out.println(id + ": store " + size);
      prefs.put(KEY_WIDTH, Integer.toString(size.width));
      prefs.put(KEY_HEIGHT, Integer.toString(size.height));


      if(comp instanceof JSplitPane) {
        JSplitPane split = (JSplitPane)comp;
        prefs.put(KEY_SPLITPOS, Integer.toString(split.getDividerLocation()));
        // System.out.println(id + ": store split=" + split.getDividerLocation());
      }


      prefs.flush();
    } catch (Exception e) {
      errCount++;
      if(errCount < maxErr) {
        Activator.log.warn("Failed to store id=" + id + ", size=" + size, e);
      }

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    if(defSize == null) {
      return null;
    }
    try {


      Preferences prefs = getPrefs();
      int w = prefs.getInt(KEY_WIDTH, defSize.width);
      int h = prefs.getInt(KEY_HEIGHT, defSize.height);


      Dimension size = new Dimension(w, h);
      return size;
    } catch (Exception e) {
      errCount++;

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