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

        keyStoreTextField.setText(prefs.get("keyStore", System.getProperty("com.sun.grid.jgdi.keyStore")));
    }


    public void saveInPrefs() {


        Preferences prefs = Preferences.userNodeForPackage(ConnectDialog.class);


        prefs.put("username", getUsername());
        prefs.putInt("port", getPort());
        prefs.put("host", getHost());


        if (useSSL) {
            prefs.put("caTop", getCaTop());
            prefs.put("keyStore", getKeystore());
        }
    }

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                new DefaultComboBoxModel(AudioQuality.values()));
        //audioQualityComboBox.setSelectedItem(wcc.getAudioQuality());


        AudioQuality audioQuality = AudioQuality.VPN;


        Preferences prefs =
                Preferences.userNodeForPackage(LoginOptionsFrame.class);


        String s = prefs.get("org.jdesktop.wonderland.modules.audiomanager." +
                "client.AUDIO_QUALITY", null);


        if (s != null) {
            AudioQuality[] audioQualityValues = AudioQuality.values();

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    // store the audio quality
    //wcc.setAudioQuality((AudioQuality) audioQualityComboBox.getSelectedItem());
    AudioQuality audioQuality =
            (AudioQuality) audioQualityComboBox.getSelectedItem();
    Preferences prefs = Preferences.userNodeForPackage(LoginOptionsFrame.class);
    prefs.put(
            "org.jdesktop.wonderland.modules.audiomanager.client.AUDIO_QUALITY",
            audioQuality.toString());


    SoftphoneControlImpl.getInstance().setAudioQuality(audioQuality);

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    /**
     * Get the current desired framerate
     * @return the current framerate
     */
    static int getDesiredFrameRate() {
        Preferences prefs = Preferences.userNodeForPackage(JmeClientMain.class);
        
        // first try a preference
        String requestedFPS = null;
        try {
            if (prefs.node(prefs.absolutePath()).get("fps", null) != null) {
                requestedFPS = prefs.get("fps", DESIRED_FPS_DEFAULT);
            }
        } catch (Exception e) {
        }
        
        // if the preference was not set, use a system property

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    /**
     * Set the current desired framerate
     * @param frameRate the current desired framerate
     */
    static void setDesiredFrameRate(int frameRate) {
        Preferences prefs = Preferences.userNodeForPackage(JmeClientMain.class);
        prefs.put("fps", String.valueOf(frameRate));
    }

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        if (userDir != null) {
            return userDir;
        }


        // first try the preference set up in the login dialog
        Preferences prefs = Preferences.userNodeForPackage(ClientContext.class);
        String userDirName = prefs.get(USERDIR_PROP, null);
        if (userDirName != null) {
            // if the user has set a preference for a directory, but that
            // directory doesn't exist, don't create it, just fall back to
            // what we would have used otherwise. This covers the case of
            // removable drives, etc

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     * @param userDirectory the user directory to use
     * @param save if true, save this value in a preference for future use
     */
    public static void setUserDirectory(File userDir, boolean save) {
        if (save) {
            Preferences prefs = Preferences.userNodeForPackage(ClientContext.class);
            prefs.put(USERDIR_PROP, userDir.getPath());
        }


        ClientContext.userDir = userDir;
    }

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    /**
     * @InternalAPI
     * Reset the user directory by removing the preference.
     */
    public static void resetUserDirectory() {
        Preferences prefs = Preferences.userNodeForPackage(ClientContext.class);
        prefs.remove(USERDIR_PROP);


        // reset the user directory to the default value
        ClientContext.userDir = null;
        ClientContext.userDir = getUserDirectory();
    }

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                addRow(new Object[]{e.getKey(), e.getValue()});
            }
        }


        public void save() {
            Preferences prefs = Preferences.userNodeForPackage(LogViewerFrame.class);
            prefs = prefs.node("loggerTable");


            try {
                prefs.clear();
            } catch (BackingStoreException ex) {
                logger.log(Level.WARNING, "Error clearing preferences", ex);
            }


            for (int i = 0; i < getRowCount(); i++) {
                String loggerName = (String) getValueAt(i, 0);
                Level level = (Level) getValueAt(i, 1);


                if (loggerName != null && level != null) {
                    Logger.getLogger(loggerName).setLevel(level);
                    prefs.put(loggerName, level.getName());
                    origLevels.remove(loggerName);
                }
            }


            // any values left in origLevels need to be reset to the

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                createdLoggers.remove(removeLogger);
            }
        }


        public void restore() {
            Preferences prefs = Preferences.userNodeForPackage(LoggerTableModel.class);
            prefs = prefs.node("loggerTable");


            try {
                for (String loggerName : prefs.keys()) {
                    Level level = Level.parse(prefs.get(loggerName, "WARNING"));
                    Logger createLogger = Logger.getLogger(loggerName);
                    createLogger.setLevel(level);


                    // OWF issue #130: hold a strong reference to the created
                    // logger, to make sure it isn't garbage collected

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