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