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.model.adapter.builder;
016    
017    import com.liferay.portal.kernel.model.adapter.builder.ModelAdapterBuilder;
018    import com.liferay.portal.kernel.model.adapter.builder.ModelAdapterBuilderLocator;
019    import com.liferay.portal.kernel.util.ArrayUtil;
020    import com.liferay.portal.kernel.util.ReflectionUtil;
021    import com.liferay.registry.Registry;
022    import com.liferay.registry.RegistryUtil;
023    import com.liferay.registry.ServiceReference;
024    import com.liferay.registry.collections.ServiceReferenceMapper;
025    import com.liferay.registry.collections.ServiceTrackerCollections;
026    import com.liferay.registry.collections.ServiceTrackerMap;
027    
028    import java.io.Closeable;
029    
030    import java.lang.reflect.ParameterizedType;
031    import java.lang.reflect.Type;
032    
033    /**
034     * @author Carlos Sierra Andr??s
035     */
036    public class ServiceTrackerMapModelAdapterBuilderLocator
037            implements ModelAdapterBuilderLocator, Closeable {
038    
039            @Override
040            public void close() {
041                    _modelAdapterBuilders.close();
042            }
043    
044            @Override
045            public <T, V> ModelAdapterBuilder<T, V> locate(
046                    Class<T> adapteeModelClass, Class<V> adaptedModelClass) {
047    
048                    return _modelAdapterBuilders.getService(
049                            _getKey(adapteeModelClass, adaptedModelClass));
050            }
051    
052            private <T, V> String _getKey(
053                    Class<T> adapteeModelClass, Class<V> adaptedModelClass) {
054    
055                    return adapteeModelClass.getName() + "->" + adaptedModelClass.getName();
056            }
057    
058            @SuppressWarnings({"unchecked", "rawtypes"})
059            private final ServiceTrackerMap<String, ModelAdapterBuilder>
060                    _modelAdapterBuilders = ServiceTrackerCollections.openSingleValueMap(
061                            ModelAdapterBuilder.class, null,
062                            new ServiceReferenceMapper<String, ModelAdapterBuilder>() {
063    
064                                    @Override
065                                    public void map(
066                                            ServiceReference<ModelAdapterBuilder> serviceReference,
067                                            Emitter<String> emitter) {
068    
069                                            Registry registry = RegistryUtil.getRegistry();
070    
071                                            ModelAdapterBuilder modelAdapterBuilder =
072                                                    registry.getService(serviceReference);
073    
074                                            Type genericInterface = ReflectionUtil.getGenericInterface(
075                                                    modelAdapterBuilder, ModelAdapterBuilder.class);
076    
077                                            if ((genericInterface == null) ||
078                                                    !(genericInterface instanceof ParameterizedType)) {
079    
080                                                    return;
081                                            }
082    
083                                            ParameterizedType parameterizedType =
084                                                    (ParameterizedType)genericInterface;
085    
086                                            Type[] typeArguments =
087                                                    parameterizedType.getActualTypeArguments();
088    
089                                            if (ArrayUtil.isEmpty(typeArguments) ||
090                                                    (typeArguments.length != 2)) {
091    
092                                                    return;
093                                            }
094    
095                                            try {
096                                                    Class adapteeModelClass = (Class)typeArguments[0];
097                                                    Class adaptedModelClass = (Class)typeArguments[1];
098    
099                                                    emitter.emit(
100                                                            _getKey(adapteeModelClass, adaptedModelClass));
101                                            }
102                                            catch (ClassCastException cce) {
103                                                    return;
104                                            }
105                                    }
106    
107                            });
108    
109    }