| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.dubbo.common.convert; |
| |
| import org.apache.dubbo.common.extension.ExtensionLoader; |
| import org.apache.dubbo.rpc.model.FrameworkModel; |
| |
| import java.util.List; |
| import java.util.Map; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.stream.Collectors; |
| |
| public class ConverterUtil { |
| private final FrameworkModel frameworkModel; |
| private final Map<Class<?>, Map<Class<?>, List<Converter>>> converterCache = new ConcurrentHashMap<>(); |
| |
| public ConverterUtil(FrameworkModel frameworkModel) { |
| this.frameworkModel = frameworkModel; |
| } |
| |
| /** |
| * Get the Converter instance from {@link ExtensionLoader} with the specified source and target type |
| * |
| * @param sourceType the source type |
| * @param targetType the target type |
| * @return |
| * @see ExtensionLoader#getSupportedExtensionInstances() |
| */ |
| public Converter<?, ?> getConverter(Class<?> sourceType, Class<?> targetType) { |
| Map<Class<?>, List<Converter>> toTargetMap = converterCache.computeIfAbsent(sourceType, (k) -> new ConcurrentHashMap<>()); |
| List<Converter> converters = toTargetMap.computeIfAbsent(targetType, (k) -> frameworkModel.getExtensionLoader(Converter.class) |
| .getSupportedExtensionInstances() |
| .stream() |
| .filter(converter -> converter.accept(sourceType, targetType)) |
| .collect(Collectors.toList())); |
| |
| return converters.size() > 0 ? converters.get(0) : null; |
| } |
| |
| /** |
| * Convert the value of source to target-type value if possible |
| * |
| * @param source the value of source |
| * @param targetType the target type |
| * @param <T> the target type |
| * @return <code>null</code> if can't be converted |
| * @since 2.7.8 |
| */ |
| public <T> T convertIfPossible(Object source, Class<T> targetType) { |
| Converter converter = getConverter(source.getClass(), targetType); |
| if (converter != null) { |
| return (T) converter.convert(source); |
| } |
| return null; |
| } |
| } |