dubbo StringToIterableConverter 源码

dubbo StringToIterableConverter 代码

文件路径：/dubbo-common/src/main/java/org/apache/dubbo/common/convert/multiple/StringToIterableConverter.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.multiple;

import org.apache.dubbo.common.convert.ConverterUtil;
import org.apache.dubbo.common.convert.StringConverter;
import org.apache.dubbo.rpc.model.FrameworkModel;

import java.util.Collection;
import java.util.Optional;

import static org.apache.dubbo.common.utils.ClassUtils.getAllInterfaces;
import static org.apache.dubbo.common.utils.ClassUtils.isAssignableFrom;
import static org.apache.dubbo.common.utils.TypeUtils.findActualTypeArgument;

/**
 * The class to convert {@link String} to {@link Iterable}-based value
 *
 * @since 2.7.6
 */
public abstract class StringToIterableConverter<T extends Iterable> implements StringToMultiValueConverter {
    private ConverterUtil converterUtil;

    public StringToIterableConverter(FrameworkModel frameworkModel) {
        converterUtil = frameworkModel.getBeanFactory().getBean(ConverterUtil.class);
    }


    public boolean accept(Class<String> type, Class<?> multiValueType) {
        return isAssignableFrom(getSupportedType(), multiValueType);
    }

    @Override
    public final Object convert(String[] segments, int size, Class<?> multiValueType, Class<?> elementType) {

        Optional<StringConverter> stringConverter = getStringConverter(elementType);

        return stringConverter.map(converter -> {

            T convertedObject = createMultiValue(size, multiValueType);

            if (convertedObject instanceof Collection) {
                Collection collection = (Collection) convertedObject;
                for (int i = 0; i < size; i++) {
                    String segment = segments[i];
                    Object element = converter.convert(segment);
                    collection.add(element);
                }
                return collection;
            }

            return convertedObject;
        }).orElse(null);
    }

    protected abstract T createMultiValue(int size, Class<?> multiValueType);

    protected Optional<StringConverter> getStringConverter(Class<?> elementType) {
        StringConverter converter = (StringConverter) converterUtil.getConverter(String.class, elementType);
        return Optional.ofNullable(converter);
    }

    protected final Class<T> getSupportedType() {
        return findActualTypeArgument(getClass(), StringToIterableConverter.class, 0);
    }

    @Override
    public final int getPriority() {
        int level = getAllInterfaces(getSupportedType(), type ->
            isAssignableFrom(Iterable.class, type)).size();
        return MIN_PRIORITY - level;
    }
}

相关信息

dubbo 源码目录

相关文章

dubbo MultiValueConverter 源码

dubbo StringToArrayConverter 源码

dubbo StringToBlockingDequeConverter 源码

dubbo StringToBlockingQueueConverter 源码

dubbo StringToCollectionConverter 源码

dubbo StringToDequeConverter 源码

dubbo StringToListConverter 源码

dubbo StringToMultiValueConverter 源码

dubbo StringToNavigableSetConverter 源码

dubbo StringToQueueConverter 源码