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            public ServiceTrackerMapModelAdapterBuilderLocator() {
038                    _modelAdapterBuilders.open();
039            }
040    
041            @Override
042            public void close() {
043                    _modelAdapterBuilders.close();
044            }
045    
046            @Override
047            public <T, V> ModelAdapterBuilder<T, V> locate(
048                    Class<T> adapteeModelClass, Class<V> adaptedModelClass) {
049    
050                    return _modelAdapterBuilders.getService(
051                            getKey(adapteeModelClass, adaptedModelClass));
052            }
053    
054            private <T, V> String getKey(
055                    Class<T> adapteeModelClass, Class<V> adaptedModelClass) {
056    
057                    return adapteeModelClass.getName() + "->" + adaptedModelClass.getName();
058            }
059    
060            @SuppressWarnings({"unchecked", "rawtypes"})
061            private final ServiceTrackerMap<String, ModelAdapterBuilder>
062                    _modelAdapterBuilders = ServiceTrackerCollections.singleValueMap(
063                            ModelAdapterBuilder.class, null,
064                            new ServiceReferenceMapper<String, ModelAdapterBuilder>() {
065    
066                                    @Override
067                                    public void map(
068                                            ServiceReference<ModelAdapterBuilder> serviceReference,
069                                            Emitter<String> emitter) {
070    
071                                            Registry registry = RegistryUtil.getRegistry();
072    
073                                            ModelAdapterBuilder modelAdapterBuilder =
074                                                    registry.getService(serviceReference);
075    
076                                            Type genericInterface = ReflectionUtil.getGenericInterface(
077                                                    modelAdapterBuilder, ModelAdapterBuilder.class);
078    
079                                            if ((genericInterface == null) ||
080                                                    !(genericInterface instanceof ParameterizedType)) {
081    
082                                                    return;
083                                            }
084    
085                                            ParameterizedType parameterizedType =
086                                                    (ParameterizedType)genericInterface;
087    
088                                            Type[] typeArguments =
089                                                    parameterizedType.getActualTypeArguments();
090    
091                                            if (ArrayUtil.isEmpty(typeArguments) ||
092                                                    (typeArguments.length != 2)) {
093    
094                                                    return;
095                                            }
096    
097                                            try {
098                                                    Class adapteeModelClass = (Class)typeArguments[0];
099                                                    Class adaptedModelClass = (Class)typeArguments[1];
100    
101                                                    emitter.emit(
102                                                            getKey(adapteeModelClass, adaptedModelClass));
103                                            }
104                                            catch (ClassCastException cce) {
105                                                    return;
106                                            }
107                                    }
108    
109                            });
110    
111    }