public final java.util.Date lastModified() {

        final File f = getFileName().getFile();

        final long lastModified = f.lastModified();

        final FolderObj fo = getExistingParent();

        if (fo != null) {

            fo.storeTimeStamps(lastModified);

        }

        return new Date(lastModified);

    }

import java.util.Enumeration;

import org.netbeans.modules.masterfs.filebasedfs.fileobjects.FileObjectFactory.Caller;

    final void storeTimeStamps(long lastModified) {

        if (lastModified > childrenStamps) {

            childrenStamps = lastModified;

        }

    }

        final long previous = childrenStamps;

        if (childrenStamps > 0) {

            long highest = 0;

            final File[] arr = getFileName().getFile().listFiles();

            if (arr != null) {

                for (File f : arr) {

                    final long time = f.lastModified();

                    if (time > highest) {

                        highest = time;

                    }

                    if (time > previous) {

                        BaseFileObj who = factory.getValidFileObject(f, Caller.Others);

                        who.fireFileChangedEvent(false);

                    }

                    childrenStamps = highest;

                }

            }

        }

/*

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

 *

 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.

 *

 * 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

 * License.  When distributing the software, include this License Header

 * Notice in each file and include the License file at

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

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

 * by Sun 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

 * your own identifying information:

 * "Portions Copyrighted [year] [name of copyright owner]"

 *

 * Contributor(s):

 *

 * The Original Software is NetBeans. The Initial Developer of the Original

 * Software is Sun Microsystems, Inc. Portions Copyright 1997-2009 Sun

 * Microsystems, Inc. All Rights Reserved.

 *

 * If you wish your version of this file to be governed by only the CDDL

 * 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

 * single choice of license, a recipient has the option to distribute

 * your version of this file under either the CDDL, the GPL Version 2 or

 * to extend the choice of license to its licensees as provided above.

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

 * Version 2 license, then the option applies only if the new code is

 * made subject to such option by the copyright holder.

 */

package org.netbeans.modules.masterfs.filebasedfs.fileobjects;

import java.io.File;

import java.io.FileOutputStream;

import java.lang.ref.Reference;

import java.lang.ref.WeakReference;

import java.util.Date;

import org.netbeans.junit.NbTestCase;

import org.openide.filesystems.FileChangeAdapter;

import org.openide.filesystems.FileEvent;

import org.openide.filesystems.FileObject;

import org.openide.filesystems.FileUtil;

public class ExternalTouchTest extends NbTestCase {

    public ExternalTouchTest(String testName) {

        super(testName);

    }

    public void testChangeInChildrenNoticed() throws Exception {

        clearWorkDir();

        FileObject testFolder = FileUtil.toFileObject(getWorkDir());

        FileObject fileObject1 = testFolder.createData("fileObject1");

        final Date lm = fileObject1.lastModified();

        assertNotNull("Just to initialize the stamp", lm);

        FileObject[] arr = testFolder.getChildren();

        assertEquals("One child", 1, arr.length);

        assertEquals("Right child", fileObject1, arr[0]);

        File file = FileUtil.toFile(fileObject1);

        assertNotNull("File found", file);

        Reference<FileObject> ref = new WeakReference<FileObject>(fileObject1);

        arr = null;

        fileObject1 = null;

        assertGC("File Object can disappear", ref);

        Thread.sleep(1000);

        class L extends FileChangeAdapter {

            int cnt;

            FileEvent event;

            @Override

            public void fileChanged(FileEvent fe) {

                cnt++;

                event = fe;

            }

        }

        L listener = new L();

        testFolder.addFileChangeListener(listener);

        FileOutputStream os = new FileOutputStream(file);

        os.write(10);

        os.close();

        if (lm.getTime() > file.lastModified() - 50) {

            fail("New modification time shall be at last 50ms after the original one: " + (file.lastModified() - lm.getTime()));

        }

        testFolder.refresh();

        assertEquals("Change notified", 1, listener.cnt);

        assertEquals("Right file", file, FileUtil.toFile(listener.event.getFile()));

    }

    public void testNewChildNoticed() throws Exception {

        clearWorkDir();

        FileObject testFolder = FileUtil.toFileObject(getWorkDir());

        FileObject fileObject1 = testFolder.createData("fileObject1");

        assertNotNull("Just to initialize the stamp", fileObject1.lastModified());

        FileObject[] arr = testFolder.getChildren();

        assertEquals("One child", 1, arr.length);

        assertEquals("Right child", fileObject1, arr[0]);

        File file = FileUtil.toFile(fileObject1);

        assertNotNull("File found", file);

        arr = null;

        fileObject1 = null;

        Reference<FileObject> ref = new WeakReference<FileObject>(fileObject1);

        assertGC("File Object can disappear", ref);

        Thread.sleep(100);

        class L extends FileChangeAdapter {

            int cnt;

            FileEvent event;

            @Override

            public void fileDataCreated(FileEvent fe) {

                cnt++;

                event = fe;

            }

        }

        L listener = new L();

        testFolder.addFileChangeListener(listener);

        File nfile = new File(file.getParentFile(), "new.txt");

        nfile.createNewFile();

        testFolder.refresh();

        assertEquals("Change notified", 1, listener.cnt);

        assertEquals("Right file", nfile, FileUtil.toFile(listener.event.getFile()));

    }

    public void testDeleteOfAChildNoticed() throws Exception {

        clearWorkDir();

        FileObject testFolder = FileUtil.toFileObject(getWorkDir());

        FileObject fileObject1 = testFolder.createData("fileObject1");

        assertNotNull("Just to initialize the stamp", fileObject1.lastModified());

        FileObject[] arr = testFolder.getChildren();

        assertEquals("One child", 1, arr.length);

        assertEquals("Right child", fileObject1, arr[0]);

        File file = FileUtil.toFile(fileObject1);

        assertNotNull("File found", file);

        arr = null;

        fileObject1 = null;

        Reference<FileObject> ref = new WeakReference<FileObject>(fileObject1);

        assertGC("File Object can disappear", ref);

        Thread.sleep(100);

        class L extends FileChangeAdapter {

            int cnt;

            FileEvent event;

            @Override

            public void fileDeleted(FileEvent fe) {

                cnt++;

                event = fe;

            }

        }

        L listener = new L();

        testFolder.addFileChangeListener(listener);

        file.delete();

        testFolder.refresh();

        assertEquals("Change notified", 1, listener.cnt);

        assertEquals("Right file", file, FileUtil.toFile(listener.event.getFile()));

    }

}