001    /**
002     * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
003     *
004     * This library is free software; you can redistribute it and/or modify it under
005     * the terms of the GNU Lesser General Public License as published by the Free
006     * Software Foundation; either version 2.1 of the License, or (at your option)
007     * any later version.
008     *
009     * This library is distributed in the hope that it will be useful, but WITHOUT
010     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
011     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
012     * details.
013     */
014    
015    package com.liferay.portlet;
016    
017    import com.liferay.registry.Filter;
018    import com.liferay.registry.Registry;
019    import com.liferay.registry.RegistryUtil;
020    import com.liferay.registry.ServiceTracker;
021    
022    /**
023     * @author Brian Wing Shun Chan
024     * @author Shuyang Zhou
025     * @author Peter Fellwock
026     */
027    public class DefaultControlPanelEntryFactory {
028    
029            public static ControlPanelEntry getInstance() {
030                    return _instance._serviceTracker.getService();
031            }
032    
033            private DefaultControlPanelEntryFactory() {
034                    Registry registry = RegistryUtil.getRegistry();
035    
036                    Filter filter = registry.getFilter(
037                            "(&(!(javax.portlet.name=*))(objectClass=" +
038                                    ControlPanelEntry.class.getName() + "))");
039    
040                    _serviceTracker = registry.trackServices(filter);
041    
042                    _serviceTracker.open();
043            }
044    
045            private static final DefaultControlPanelEntryFactory _instance =
046                    new DefaultControlPanelEntryFactory();
047    
048            private final ServiceTracker<ControlPanelEntry, ControlPanelEntry>
049                    _serviceTracker;
050    
051    }