test/java/util/prefs/AddNodeChangeListener.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 */

 /* @test
  * @bug  7160252 7197662
  * @summary Checks if events are delivered to a listener
  *          when a child node is added or removed
  * @run main/othervm -Djava.util.prefs.userRoot=. AddNodeChangeListener
  */

import java.util.prefs.*;

 public class AddNodeChangeListener {

     private static boolean failed = false;
     private static Preferences userRoot, N2;
     private static NodeChangeListenerAdd ncla;

     public static void main(String[] args)
         throws BackingStoreException, InterruptedException
     {
        userRoot = Preferences.userRoot();
        ncla = new NodeChangeListenerAdd();
        userRoot.addNodeChangeListener(ncla);
        //Should initiate a node added event
        addNode();
        // Should not initiate a node added event
        addNode();
        //Should initate a child removed event
        removeNode();

        if (failed)
            throw new RuntimeException("Failed");
    }

    private static void addNode()
        throws BackingStoreException, InterruptedException
    {
        N2 = userRoot.node("N2");
        userRoot.flush();
        Thread.sleep(3000);
        if (ncla.getAddNumber() != 1)
            failed = true;
    }

    private static void removeNode()
        throws BackingStoreException, InterruptedException
    {
        N2.removeNode();
        userRoot.flush();
        Thread.sleep(3000);
        if (ncla.getAddNumber() != 0)
            failed = true;
    }

    private static class NodeChangeListenerAdd implements NodeChangeListener {
        private int totalNode = 0;

        @Override
        public void childAdded(NodeChangeEvent evt) {
            totalNode++;
        }

        @Override
        public void childRemoved(NodeChangeEvent evt) {
            totalNode--;
        }

        public int getAddNumber(){
            return totalNode;
        }
    }
 }