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.portal.kernel.search.facet.util;
016    
017    import com.liferay.portal.kernel.log.Log;
018    import com.liferay.portal.kernel.log.LogFactoryUtil;
019    import com.liferay.portal.kernel.search.SearchContext;
020    import com.liferay.portal.kernel.search.facet.Facet;
021    import com.liferay.portal.kernel.search.facet.config.FacetConfiguration;
022    import com.liferay.registry.Registry;
023    import com.liferay.registry.RegistryUtil;
024    import com.liferay.registry.ServiceReference;
025    import com.liferay.registry.ServiceTracker;
026    import com.liferay.registry.ServiceTrackerCustomizer;
027    
028    import java.util.Map;
029    import java.util.concurrent.ConcurrentHashMap;
030    
031    /**
032     * @author Raymond Aug??
033     */
034    public class FacetFactoryUtil {
035    
036            public static Facet create(
037                            SearchContext searchContext, FacetConfiguration facetConfiguration)
038                    throws Exception {
039    
040                    String className = facetConfiguration.getClassName();
041    
042                    FacetFactory facetFactory = _instance._facetFactories.get(className);
043    
044                    if (facetFactory == null) {
045                            if (_log.isDebugEnabled()) {
046                                    _log.debug(
047                                            "Unable to find facet factory for class " + className);
048                            }
049    
050                            return null;
051                    }
052    
053                    Facet facet = facetFactory.newInstance(searchContext);
054    
055                    facet.setFacetConfiguration(facetConfiguration);
056    
057                    return facet;
058            }
059    
060            public FacetFactoryUtil() {
061                    Registry registry = RegistryUtil.getRegistry();
062    
063                    _serviceTracker = registry.trackServices(
064                            FacetFactory.class, new FacetFactoryServiceTrackerCustomizer());
065    
066                    _serviceTracker.open();
067            }
068    
069            private static final Log _log = LogFactoryUtil.getLog(
070                    FacetFactoryUtil.class);
071    
072            private static final FacetFactoryUtil _instance = new FacetFactoryUtil();
073    
074            private final Map<String, FacetFactory> _facetFactories =
075                    new ConcurrentHashMap<>();
076            private final ServiceTracker<FacetFactory, FacetFactory> _serviceTracker;
077    
078            private class FacetFactoryServiceTrackerCustomizer
079                    implements ServiceTrackerCustomizer<FacetFactory, FacetFactory> {
080    
081                    @Override
082                    public FacetFactory addingService(
083                            ServiceReference<FacetFactory> serviceReference) {
084    
085                            Registry registry = RegistryUtil.getRegistry();
086    
087                            FacetFactory facetFactory = registry.getService(serviceReference);
088    
089                            _facetFactories.put(facetFactory.getFacetClassName(), facetFactory);
090    
091                            return facetFactory;
092                    }
093    
094                    @Override
095                    public void modifiedService(
096                            ServiceReference<FacetFactory> serviceReference,
097                            FacetFactory facetFactory) {
098                    }
099    
100                    @Override
101                    public void removedService(
102                            ServiceReference<FacetFactory> serviceReference,
103                            FacetFactory facetFactory) {
104    
105                            Registry registry = RegistryUtil.getRegistry();
106    
107                            registry.ungetService(serviceReference);
108    
109                            _facetFactories.remove(facetFactory.getFacetClassName());
110                    }
111    
112            }
113    
114    }