<summary>Added getVisibilityQueryImplementation() method to VersioningSystem</summary>

            <version major="1" minor="10"/>

            <date day="8" month="12" year="2009"/>

            <author login="tstupka"/>

            <compatibility addition="yes"/>

            <description>

                Some Versioning systems provide a VisibilityQueryImplementation. This API change has two purposes:

                1. There will be only one registered VQI (Versioning manager) that will delegate the query to the appropriate

                versioning system which will speed things up.

                2. It makes it clear and explicit that implementors of a VersioningSystem might want to provide the query.

                It would be possible for them to just implement and register their own VisibilityQueryImplementation but

                they could easily forget to do that.

            </description>

            <class package="org.netbeans.modules.versioning.spi" name="VersioningSystem"/>

            <issue number="146634"/>

        </change>

        <change>

            <api name="versioning_spi"/>

/*

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

 *

 * Copyright 1997-2009 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 1997-2008 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.versioning;

import javax.swing.event.ChangeListener;

import org.netbeans.modules.versioning.spi.VersioningSystem;

import java.io.File;

import java.util.ArrayList;

import java.util.List;

import javax.swing.event.ChangeEvent;

import org.netbeans.modules.versioning.spi.VCSVisibilityQuery;

import org.netbeans.spi.queries.VisibilityQueryImplementation2;

import org.openide.filesystems.FileObject;

import org.openide.filesystems.FileUtil;

/**

 * Delegates the work to the owner of files in query.

 * 

 * @author Tomas Stupka

 */

@org.openide.util.lookup.ServiceProvider(service=org.netbeans.spi.queries.VisibilityQueryImplementation.class)

public class VcsVisibilityQueryImplementation implements VisibilityQueryImplementation2 {

    private List<ChangeListener> listeners = new ArrayList<ChangeListener>();

    private static VcsVisibilityQueryImplementation instance;

    public VcsVisibilityQueryImplementation() {

        instance = this;

    }

    public static VcsVisibilityQueryImplementation getInstance() {

        return instance;

    }

    public boolean isVisible(File file) {

        VersioningSystem system = VersioningManager.getInstance().getOwner(file);

        if(system == null) {

            return true;

        }

        VCSVisibilityQuery vqi = system.getVisibilityQuery();

        return vqi == null ? true : vqi.isVisible(file);

    }

    public boolean isVisible(FileObject fileObject) {

        File file = FileUtil.toFile(fileObject);

        if(file == null) {

            return true;

        }

        return isVisible(file);

    }

    public synchronized void addChangeListener(ChangeListener l) {

        ArrayList<ChangeListener> newList = new ArrayList<ChangeListener>(listeners);

        newList.add(l);

        listeners = newList;

    }

    public synchronized void removeChangeListener(ChangeListener l) {

        ArrayList<ChangeListener> newList = new ArrayList<ChangeListener>(listeners);

        newList.remove(l);

        listeners = newList;

    }

    public void fireVisibilityChanged() {

        ChangeListener[] ls;

        synchronized(this) {

            ls = listeners.toArray(new ChangeListener[listeners.size()]);

        }

        ChangeEvent event = new ChangeEvent(this);

        for (ChangeListener l : ls) {

            l.stateChanged(event);

        }

    }

}

/*

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

 *

 * Copyright 1997-2009 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 1997-2008 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.versioning.spi;

import java.io.File;

import org.netbeans.modules.versioning.VcsVisibilityQueryImplementation;

import org.netbeans.spi.queries.VisibilityQueryImplementation2;

/**

 * Provides the visibility servis according to {@link VisibilityQueryImplementation2}

 * for a particular VersioningSystem

 * 

 * @author Tomas Stupka

 */

public abstract class VCSVisibilityQuery {

    /**

     * Check whether a file is recommended to be visible.

     * @param file a file to considered

     * @return true if it is recommended to display this file

     */

    public abstract boolean isVisible(File file);

    /**

     * Notify a visibility change

     */

    protected final void fireVisibilityChanged() {

        VcsVisibilityQueryImplementation vq = VcsVisibilityQueryImplementation.getInstance();

        if(vq != null) {

            // was touched from outside - lets fire the change

            vq.fireVisibilityChanged();

        }

    }

}

import org.netbeans.spi.queries.VisibilityQueryImplementation2;

     * Retrieves a VCSVisibilityQuery implementation if this versioning system provides one.

     *

     * @return VCSVisibilityQuery a VCSVisibilityQuery instance or null if the system does not provide the service

     * @since 1.10

     */

    public VCSVisibilityQuery getVisibilityQuery() {

        return null;

    }

    /**

/*

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

 *

 * Copyright 1997-2009 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 1997-2007 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.versioning.spi;

import java.io.IOException;

import org.openide.filesystems.FileUtil;

import org.openide.filesystems.FileStateInvalidException;

import org.openide.filesystems.FileObject;

import java.io.File;

import org.netbeans.api.queries.VisibilityQuery;

import org.netbeans.junit.NbTestCase;

import org.netbeans.modules.versioning.spi.testvcs.TestVCS;

import org.netbeans.modules.versioning.spi.testvcs.TestVCSVisibilityQuery;

/**

 * Versioning SPI unit tests of VCSVisibilityQuery.

 * 

 * @author Tomas Stupka

 */

public class VCSVisibilityQueryTest extends NbTestCase {

    public VCSVisibilityQueryTest(String testName) {

        super(testName);

    }

    protected void setUp() throws Exception {

        System.setProperty("netbeans.user", System.getProperty("data.root.dir") + "/userdir");

        super.setUp();

    }

    public void testVQ() throws FileStateInvalidException, IOException {

        File folder = new File(getWorkDir(), TestVCS.VERSIONED_FOLDER_SUFFIX);

        folder.mkdirs();

        File visible = new File(folder, "this-file-is-visible");

        visible.createNewFile();

        FileObject visibleFO = FileUtil.toFileObject(visible);

        assertTrue(VisibilityQuery.getDefault().isVisible(visible));

        assertTrue(VisibilityQuery.getDefault().isVisible(visibleFO));

        File invisible = new File(folder, "this-file-is-" + TestVCSVisibilityQuery.INVISIBLE_FILE_SUFFIX);

        invisible.createNewFile();

        FileObject invisibleFO = FileUtil.toFileObject(invisible);

        assertFalse(VisibilityQuery.getDefault().isVisible(invisible));

        assertFalse(VisibilityQuery.getDefault().isVisible(invisibleFO));

    }

}

import org.netbeans.modules.versioning.spi.VCSVisibilityQuery;

    private VCSVisibilityQuery vq;

    public static final String VERSIONED_FOLDER_SUFFIX = "-test-versioned";

        vq = new TestVCSVisibilityQuery();

    @Override

    public VCSVisibilityQuery getVisibilityQuery() {

        return vq;

}

/*

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

 *

 * Copyright 2009 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]"

 *

 * 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 2009 Sun Microsystems, Inc.

 */

package org.netbeans.modules.versioning.spi.testvcs;

import java.io.File;

import org.netbeans.modules.versioning.spi.VCSVisibilityQuery;

/**

 *

 * @author Tomas Stupka

 */

public class TestVCSVisibilityQuery extends VCSVisibilityQuery {

    public static final String INVISIBLE_FILE_SUFFIX = "invisible";

    @Override

    public boolean isVisible(File file) {

        return !file.getName().endsWith(INVISIBLE_FILE_SUFFIX);

    }

}