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 ("").

            }


            Preferences userRoot = Preferences.userRoot();


            // if there are no rhq-agent prefs stored then there is nothing to migrate
            if (!userRoot.nodeExists(NODE_PARENT)) {
                return;
            }


            Properties configProps = new Properties();
            Preferences topNode = userRoot.node(NODE_PARENT);

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          (valueClass != null)) {
        if (!getPreferences(wikipedia).nodeExists(property)) {
          return null;
        }
        Preferences globalNode = getPreferences(wikipedia).node(property);
        if (!globalNode.nodeExists(name)) {
          return null;
        }
        Preferences node = globalNode.node(name);
        Object result = valueClass.newInstance();
        Method[] methods = valueClass.getMethods();

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  public void removePojo(
      EnumWikipedia wikipedia, String property, String id) {
    if ((getPreferences(wikipedia) != null) && (property != null) && (id != null)) {
      Preferences globalNode = getPreferences(wikipedia).node(property);
      try {
        if (globalNode.nodeExists(id)) {
          Preferences node = globalNode.node(id);
          node.removeNode();
        }
      } catch (BackingStoreException e) {
        //

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          (valueClass != null)) {
        if (!getPreferences(wikipedia).nodeExists(property)) {
          return null;
        }
        Preferences globalNode = getPreferences(wikipedia).node(property);
        if (!globalNode.nodeExists(name)) {
          return null;
        }
        Preferences pageNode = globalNode.node(name);
        ArrayList<Object> results = new ArrayList<Object>();
        int i = 0;

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          return null;
        }
        Preferences pageNode = globalNode.node(name);
        ArrayList<Object> results = new ArrayList<Object>();
        int i = 0;
        while (pageNode.nodeExists(Integer.toString(i))) {
          Preferences node = pageNode.node(Integer.toString(i));
          Object result = valueClass.newInstance();
          Method[] methods = valueClass.getMethods();
          Method fixValuesMethod = null;
          for (Method m : methods) {

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      try {
        if (!getPreferences().nodeExists(PROPERTY_WINDOW)) {
          return;
        }
        Preferences node = getPreferences().node(PROPERTY_WINDOW);
        if (!node.nodeExists(window.getName())) {
          return;
        }
        node = node.node(window.getName());
        window.setLocation(
            node.getInt(PROPERTY_WINDOW_X, 0),

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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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      in = PreferencesTest.class.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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    } catch (BackingStoreException e) {
    }
    p.name();
    p.node(null);
    try {
      p.nodeExists(null);
    } catch (BackingStoreException e1) {
    }
    p.parent();
    p.put(null, null);
    p.putBoolean(null, false);

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