org/netbeans/nbbuild/IsLocked*.class,\

        <typedef name="islocked" classname="org.netbeans.nbbuild.IsLocked" 

                 classpath="${harness.dir}/tasks.jar"/>

        <typedef name="islocked" classname="org.netbeans.nbbuild.IsLocked" 

                 classpath="${harness.dir}/tasks.jar"/>

/*

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

 *

 * Copyright 2011 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

 * 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.  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

 * your own identifying information:

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

 *

 * 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.

 *

 * Contributor(s):

 *

 * Portions Copyrighted 2011 Sun Microsystems, Inc.

 */

package org.netbeans.nbbuild;

import java.io.File;

import java.io.IOException;

import java.io.RandomAccessFile;

import java.nio.channels.FileLock;

import org.apache.tools.ant.BuildException;

import org.apache.tools.ant.taskdefs.condition.Condition;

/** Checks whether given file can be locked or not.

 *

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

 */

public final class IsLocked implements Condition {

    private File file;

    // defaults as for tryLock():

    private long position = 0L;

    private long size = Long.MAX_VALUE;

    private boolean shared = false;

    public void setShared(boolean shared) {

        this.shared = shared;

    }

    public void setFile(File file) {

        this.file = file;

    }

    public void setPosition(long position) {

        this.position = position;

    }

    public void setSize(long size) {

        this.size = size;

    }

    public boolean eval() throws BuildException {

        if (file == null) {

            throw new BuildException("file needs to be specified");

        }

        if (!file.exists()) {

            return false;

        }

        RandomAccessFile raf = null;

        FileLock lock = null;

        try {

            raf = new RandomAccessFile(file, "rw");

            try {

                lock = raf.getChannel().tryLock(position, size, shared);

                if (lock == null) {

                    return true;

                }

            } catch (RuntimeException ex) {

                throw new IOException(ex);

            }

            return false;

        } catch (IOException ex) {

            return true;

        } finally {

            try {

                if (lock != null) {

                    lock.release();

                }

                if (raf != null) {

                    raf.close();

                }

            } catch (IOException ex) {

                throw new BuildException("Cannot close " + file, ex);

            }

        }

    }

}

    <typedef name="islocked" classname="org.netbeans.nbbuild.IsLocked"

         classpath="${nb_all}/nbbuild/nbantext.jar"/>

/*

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

 *

 * Copyright 2011 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

 * 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.  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

 * your own identifying information:

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

 *

 * 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.

 *

 * Contributor(s):

 *

 * Portions Copyrighted 2011 Sun Microsystems, Inc.

 */

package org.netbeans.nbbuild;

import java.io.File;

import java.io.FileOutputStream;

import java.nio.channels.FileLock;

import org.netbeans.junit.NbTestCase;

public class IsLockedTest extends NbTestCase {

    private IsLocked condition;

    private File file;

    public IsLockedTest(String name) {

        super(name);

    }

    @Override

    protected void setUp() throws Exception {

        file = new File(getWorkDir(), "file");

        file.createNewFile();

        condition = new IsLocked();

        condition.setFile(file);

    }

    public void testCanLock() {

        assertFalse("Is not locked", condition.eval());

    }

    public void testDoesNotExists() {

        file.delete();

        assertFalse("Is not locked", condition.eval());

        assertFalse("Still does not exist", file.exists());

    }

    public void testCannotLock() throws Exception {

        FileOutputStream os = new FileOutputStream(file);

        FileLock lock = os.getChannel().lock();

        try {

            assertTrue("Is locked", condition.eval());

        } finally {

            lock.release();

        }

    }

}