dubbo ConverterUtil 源码
dubbo ConverterUtil 代码
文件路径：/dubbo-common/src/main/java/org/apache/dubbo/common/convert/ConverterUtil.java
/*
* 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;
}
}
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