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/*
* 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.multiple;
import org.apache.dubbo.common.extension.ExtensionLoader;
import org.apache.dubbo.common.extension.ExtensionScope;
import org.apache.dubbo.common.extension.SPI;
import org.apache.dubbo.common.lang.Prioritized;
import java.util.Collection;
import static org.apache.dubbo.common.extension.ExtensionLoader.getExtensionLoader;
import static org.apache.dubbo.common.utils.TypeUtils.findActualTypeArgument;
/**
* An interface to convert the source-typed value to multiple value, e.g , Java array, {@link Collection} or
* sub-interfaces
*
* @param The source type
* @since 2.7.6
*/
@SPI(scope = ExtensionScope.FRAMEWORK)
public interface MultiValueConverter extends Prioritized {
/**
* Accept the source type and target type or not
*
* @param sourceType the source type
* @param multiValueType the multi-value type
* @return if accepted, return true
, or false
*/
boolean accept(Class sourceType, Class multiValueType);
/**
* Convert the source to be the multiple value
*
* @param source the source-typed value
* @param multiValueType the multi-value type
* @param elementType the element type
* @return
*/
Object convert(S source, Class multiValueType, Class elementType);
/**
* Get the source type
*
* @return non-null
*/
default Class getSourceType() {
return findActualTypeArgument(getClass(), MultiValueConverter.class, 0);
}
/**
* Find the {@link MultiValueConverter} instance from {@link ExtensionLoader} with the specified source and target type
*
* @param sourceType the source type
* @param targetType the target type
* @return null
if not found
* @see ExtensionLoader#getSupportedExtensionInstances()
* @since 2.7.8
*/
static MultiValueConverter find(Class sourceType, Class targetType) {
return getExtensionLoader(MultiValueConverter.class)
.getSupportedExtensionInstances()
.stream()
.filter(converter -> converter.accept(sourceType, targetType))
.findFirst()
.orElse(null);
}
static T convertIfPossible(Object source, Class multiValueType, Class elementType) {
Class sourceType = source.getClass();
MultiValueConverter converter = find(sourceType, multiValueType);
if (converter != null) {
return (T) converter.convert(source, multiValueType, elementType);
}
return null;
}
}