import java.io.FileFilter;

                if (filter != null && !filter.accept(obj.getFileName().getFile())) {

                    continue;

                }

/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

 *

 * Copyright 2010 Oracle and/or its affiliates. All rights reserved.

 *

 * Oracle and Java are registered trademarks of Oracle and/or its affiliates.

 * Other names may be trademarks of their respective owners.

 *

 * The contents of this file are subject to the terms of either the GNU

 * General Public License Version 2 only ("GPL") or the Common

 * Development and Distribution License("CDDL") (collectively, the

 * "License"). You may not use this file except in compliance with the

 * License. You can obtain a copy of the License at

 * http://www.netbeans.org/cddl-gplv2.html

 * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the

 * specific language governing permissions and limitations under the

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 * Notice in each file and include the License file at

 * nbbuild/licenses/CDDL-GPL-2-CP.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the GPL Version 2 section of the License file that

 * accompanied this code. If applicable, add the following below the

 * License Header, with the fields enclosed by brackets [] replaced by

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 * or only the GPL Version 2, indicate your decision by adding

 * "[Contributor] elects to include this software in this distribution

 * under the [CDDL or GPL Version 2] license." If you do not indicate a

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 * However, if you add GPL Version 2 code and therefore, elected the GPL

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 * Contributor(s):

 *

 * Portions Copyrighted 2010 Sun Microsystems, Inc.

 */

package org.netbeans.modules.masterfs.filebasedfs;

import java.io.File;

import java.io.FileFilter;

import java.io.IOException;

import java.util.ArrayList;

import java.util.List;

import java.util.concurrent.Callable;

import java.util.logging.Level;

import java.util.logging.Logger;

import org.netbeans.junit.NbTestCase;

import org.openide.filesystems.FileAttributeEvent;

import org.openide.filesystems.FileChangeListener;

import org.openide.filesystems.FileEvent;

import org.openide.filesystems.FileObject;

import org.openide.filesystems.FileRenameEvent;

import org.openide.filesystems.FileUtil;

/**

 *

 * @author Jaroslav Tulach <jtulach@netbeans.org>

 */

public class FileUtilAddRecursiveListenerFilterTest extends NbTestCase

implements FileChangeListener {

    private FileObject root;

    private List<FileEvent> events = new ArrayList<FileEvent>();

    @SuppressWarnings("NonConstantLogger")

    private Logger LOG;

    public FileUtilAddRecursiveListenerFilterTest(String n) {

        super(n);

    }

    @Override

    protected Level logLevel() {

        return Level.FINEST;

    }

    @Override

    protected void setUp() throws Exception {

        clearWorkDir();

        LOG = Logger.getLogger("test." + getName());

        root = FileUtil.toFileObject(getWorkDir());

        assertNotNull("Root found", root);

        for (int i = 0; i < 10; i++) {

            if (i % 2 == 0) {

                root.createData("" + i, "txt");

            } else {

                root.createFolder("" + i);

            }

        }

    }

    public void testAddListenerGetsFiveCallbacks() throws IOException {

        class AtMostFive implements FileFilter {

            @Override

            public boolean accept(File pathname) {

                assertTrue("It is folder", pathname.isDirectory());

                int number = Integer.parseInt(pathname.getName());

                return number <= 5;

            }

        }

        FileUtil.addRecursiveListener(this, getWorkDir(), new AtMostFive(), null);

        File fifthChild = new File(new File(getWorkDir(), "5"), "new.5.txt");

        assertTrue(fifthChild.createNewFile());

        FileUtil.refreshFor(getWorkDir());

        assertEquals("One event delivered: " + events, 1, events.size());

        File seventhChild = new File(new File(getWorkDir(), "7"), "new.7.txt");

        assertTrue(seventhChild.createNewFile());

        FileUtil.refreshFor(getWorkDir());

        assertEquals("No other even delivered: " + events, 1, events.size());

    }

    @Override

    public void fileFolderCreated(FileEvent fe) {

        LOG.log(Level.INFO, "fileFolderCreated: {0}", fe.getFile());

        LOG.log(Level.INFO, "Thread dump", new Exception());

        events.add(fe);

    }

    @Override

    public void fileDataCreated(FileEvent fe) {

        LOG.log(Level.INFO, "fileDataCreated: {0}", fe.getFile());

        LOG.log(Level.INFO, "Thread dump", new Exception());

        events.add(fe);

    }

    @Override

    public void fileChanged(FileEvent fe) {

        LOG.log(Level.INFO, "fileChanged: {0}", fe.getFile());

        LOG.log(Level.INFO, "Thread dump", new Exception());

        events.add(fe);

    }

    @Override

    public void fileDeleted(FileEvent fe) {

        LOG.log(Level.INFO, "fileDeleted: {0}", fe.getFile());

        LOG.log(Level.INFO, "Thread dump", new Exception());

        events.add(fe);

    }

    @Override

    public void fileRenamed(FileRenameEvent fe) {

        LOG.log(Level.INFO, "fileRenamed: {0}", fe.getFile());

        LOG.log(Level.INFO, "Thread dump", new Exception());

        events.add(fe);

    }

    @Override

    public void fileAttributeChanged(FileAttributeEvent fe) {

        LOG.log(Level.INFO, "fileAttributeChanged: {0}", fe.getFile());

        LOG.log(Level.INFO, "Thread dump", new Exception());

        events.add(fe);

    }

}

import java.io.FileFilter;

    private final FileFilter filter;

        this.filter = ff;

    @Override

    public boolean accept(File pathname) {

        return filter == null || filter.accept(pathname);

    }