Examples of java.util.prefs.Preferences.nodeExists()

java.util.prefs.Preferences.nodeExists()
Returns true if the named preference node exists in the same tree as this node. Relative path names (which do not begin with the slash character ('/')) are interpreted relative to this preference node.
If this node (or an ancestor) has already been removed with the {@link #removeNode()} method, it is legal to invoke this method,but only with the path name ""; the invocation will return false. Thus, the idiom p.nodeExists("") may be used to test whether p has been removed. @param pathName the path name of the node whose existenceis to be checked. @return true if the specified node exists. @throws BackingStoreException if this operation cannot be completeddue to a failure in the backing store, or inability to communicate with it. @throws IllegalArgumentException if the path name is invalid (i.e.,it contains multiple consecutive slash characters, or ends with a slash character and is more than one character long). @throws NullPointerException if path name is null. @throws IllegalStateException if this node (or an ancestor) has beenremoved with the {@link #removeNode()} method andpathName is not the empty string ("").

            /* 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();

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    // audioboxes
    value = AudioBoxConfig.ID_DEFAULT;
    putDontOverwrite( childPrefs, KEY_AUDIOBOX, value );
    try {
      if( !childPrefs.nodeExists( NODE_AUDIOBOXES )) {
        childPrefs2  = childPrefs.node( NODE_AUDIOBOXES );
        new AudioBoxConfig( value, "Default", 8, 8, true ).toPrefs( childPrefs2.node( value ));
      }
    }
    catch( BackingStoreException e1 ) {

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    // outputconfigs
    value = "out1to2";
    putDontOverwrite( childPrefs, KEY_OUTPUTCONFIG, value );
    try {
      if( !childPrefs.nodeExists( NODE_OUTPUTCONFIGS )) {
        childPrefs2 = childPrefs.node( NODE_OUTPUTCONFIGS );
        new RoutingConfig( value, "Out 1-2", new int[] { 0, 1 }, -90f ).toPrefs(
          childPrefs2.node( value ));
        value = "out1to8";
        new RoutingConfig( value, "Out 1-8", new int[] { 0, 1, 2, 3, 4, 5, 6, 7 }, -45f ).toPrefs(

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      warnings.add( e1.toString() );
    }


    // inputconfigs
    try {
      if( !childPrefs.nodeExists( NODE_INPUTCONFIGS )) {
        childPrefs2 = childPrefs.node( NODE_INPUTCONFIGS );
        value = "in1";
        new RoutingConfig( value, "In 1", new int[] { 0 }, 0f ).toPrefs(
          childPrefs2.node( value ));
        value = "in1to2";

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    }
    
    // view
    childPrefs  = mainPrefs.node( NODE_VIEW );
    try {
      if( !childPrefs.nodeExists( NODE_SONAGRAM )) {
        childPrefs2 = childPrefs.node( NODE_SONAGRAM );
        new ConstQ().writePrefs( childPrefs2 );
      }
    }
    catch( BackingStoreException e1 ) {

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      oCfgDynPrefs.setPreferences( null );
      oCfgNode = null;
    }


    try {
      if( (cfgID != null) && childPrefs.nodeExists( cfgID )) {
        oCfgNode  = childPrefs.node( cfgID );
        newCfg    = new RoutingConfig( oCfgNode );
//        oCfgNode.addPreferenceChangeListener( oCfgListener );
        oCfgDynPrefs.setPreferences( oCfgNode );
        oCfgDynPrefs.startListening();

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        assertTrue(pref.nodeExists("child"));
        assertTrue(pref.nodeExists("child/grandchild"));
        grandchild.removeNode();
        assertTrue(pref.nodeExists("child"));
        assertFalse(pref.nodeExists("child/grandchild"));
        assertFalse(grandchild.nodeExists(""));


        assertFalse(pref.nodeExists("child2/grandchild"));
        pref.node("child2/grandchild");
        assertTrue(pref.nodeExists("child2/grandchild"));
    }

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        pref.removeNode();


        assertFalse(child.nodeExists(""));
        assertFalse(child1.nodeExists(""));
        assertFalse(grandchild.nodeExists(""));
        assertFalse(pref.nodeExists(""));
    }


    // public void testAddNodeChangeListener() throws BackingStoreException {
    // try {

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                    .getResourceAsStream("/prefs/java/util/prefs/userprefs.xml");
            Preferences.importPreferences(in);


            prefs = Preferences.userNodeForPackage(PreferencesTest.class);
            assertEquals(1, prefs.childrenNames().length);
            assertTrue(prefs.nodeExists("mock/child/grandson"));
            assertEquals("newvalue", prefs.get("prefskey", null));
            assertEquals("oldvalue2", prefs.get("prefskey2", null));
            assertEquals("newvalue3", prefs.get("prefskey3", null));


            in = PreferencesTest.class

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          p.removeNode();
        }
        else if (type.equals("local"))
        {
          final Properties props = new Properties();
          if (p.nodeExists("properties"))
          {
            final Preferences preferences = p.node("properties");
            final String[] strings = preferences.keys();
            for (int j = 0; j < strings.length; j++)
            {

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