dubbo StringToMultiValueConverter 源码

  • 2022-10-20
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dubbo StringToMultiValueConverter 代码

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

import static org.apache.dubbo.common.utils.StringUtils.isEmpty;
import static org.apache.dubbo.common.utils.StringUtils.split;

/**
 * The class to convert {@link String} to multiple value object
 *
 * @see MultiValueConverter
 * @since 2.7.6
 */
public interface StringToMultiValueConverter extends MultiValueConverter<String> {

    @Override
    default Object convert(String source, Class<?> multiValueType, Class<?> elementType) {

        if (isEmpty(source)) {
            return null;
        }

        // split by the comma
        String[] segments = split(source, ',');

        if (ArrayUtils.isEmpty(segments)) { // If empty array, create an array with only one element
            segments = new String[]{source};
        }

        int size = segments.length;

        return convert(segments, size, multiValueType, elementType);
    }

    /**
     * Convert the segments to multiple value object
     *
     * @param segments    the String array of content
     * @param size        the size of multiple value object
     * @param targetType  the target type
     * @param elementType the element type
     * @return multiple value object
     */
    Object convert(String[] segments, int size, Class<?> targetType, Class<?> elementType);
}

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