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/**
 * Copyright 2018 jianggujin (www.jianggujin.com).
 * 
 * Licensed 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 com.jianggujin.http.util;

import java.util.List;
import java.util.Map;

/**
 * 多值Map
 * 
 * @author jianggujin
 *
 * @param 
 * @param 
 */
public interface JMultiValueMap extends Map> {
    /**
     * 获得指定键值对应的首个值
     * 
     * @param key
     * @return
     */
    V getFirst(K key);

    /**
     * 添加
     * 
     * @param key
     * @param value
     */
    void add(K key, V value);

    /**
     * 设置
     * 
     * @param key
     * @param value
     */
    void set(K key, V value);

    /**
     * 设置
     * 
     * @param values
     */
    void setAll(Map values);

    /**
     * 转换为单值集合
     * 
     * @return
     */
    Map toSingleValueMap();

}