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 ("").

            
            String tempClassName = null;
            
            try
            {
                if ( systemRoot != null && systemRoot.nodeExists( "jivalo/config/callcontext/factory" ) )
                {
                    Preferences node = systemRoot.node( "jivalo/config/callcontext/factory" );
                    tempClassName = node.get( "applClientClass", null);
                }
            }

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        String tempClassName = null;
        
        try
        {
            if ( systemRoot != null && systemRoot.nodeExists( "jivalo/config/callcontext/factory" ) )
            {
                Preferences node = systemRoot.node( "jivalo/config/callcontext/factory" );
                tempClassName = node.get( "class", null);
            }
        }

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        Preferences icEjbNode = getInitialContextEjbNode();
        
        try
        {
            if ( icEjbNode.nodeExists( clazz.getName() ))
            {
                String[] childrenNames = icEjbNode.childrenNames();
                
                for ( int i = 0; i < childrenNames.length; i++ )
                {

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            if ( getMBeanServer() != null )
            {
                try
                {
                    if ( nodeLite != null
                            && nodeLite.nodeExists( NODE_LITE_DATASOURCE ) )
                    {
                        Preferences nodeDataSources = nodeLite
                                .node( NODE_LITE_DATASOURCE );


                        processDataSourceNode( nodeDataSources );

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    {
        Preferences prefs = Preferences.userRoot();


        final String test_node = "removeTest";


        assertFalse(prefs.nodeExists(test_node));


        Preferences removeNode = prefs.node(test_node);


        assertNotNull(removeNode);

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                    public Properties run() {
                        Properties p = new Properties();
                        String notePath = "/com/sun/media/sound/softsynthesizer";
                        try {
                            Preferences prefroot = Preferences.userRoot();
                            if (prefroot.nodeExists(notePath)) {
                                Preferences prefs = prefroot.node(notePath);
                                String[] prefs_keys = prefs.keys();
                                for (String prefs_key : prefs_keys) {
                                    String val = prefs.get(prefs_key, null);
                                    if (val != null)

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    {
        Preferences prefs = Preferences.userRoot();


        final String test_node = "removeTest";


        assertFalse(prefs.nodeExists(test_node));


        Preferences removeNode = prefs.node(test_node);


        assertNotNull(removeNode);

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    private Preferences findNode( String code ) {
        try {
            Preferences root = Preferences.userRoot();
            Preferences node = root.node(CUSTOM_ID);


            if (node.nodeExists(code)) {
                return node.node(code);
            }


            for( String id : node.childrenNames() ) {
                Preferences child = node.node(id);

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                    + (pathName == null ? "" : DICOM_DEVICES_ROOT + pathName);


        Preferences prefs = system
                ? Preferences.systemRoot()
                : Preferences.userRoot();
        if (!prefs.nodeExists(pathName)) {
            System.err.println(MessageFormat.format(
                    rb.getString("no-such-path"), pathName));
            System.exit(2);
        }
        prefs.node(pathName).exportSubtree(System.out);

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                    public Properties run() {
                        Properties p = new Properties();
                        String notePath = "/com/sun/media/sound/softsynthesizer";
                        try {
                            Preferences prefroot = Preferences.userRoot();
                            if (prefroot.nodeExists(notePath)) {
                                Preferences prefs = prefroot.node(notePath);
                                String[] prefs_keys = prefs.keys();
                                for (String prefs_key : prefs_keys) {
                                    String val = prefs.get(prefs_key, null);
                                    if (val != null)

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