spring MultiValueMap 源码
spring MultiValueMap 代码
文件路径：/spring-core/src/main/java/org/springframework/util/MultiValueMap.java
/*
* Copyright 2002-2019 the original author or authors.
*
* 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
*
* https://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.springframework.util;
import java.util.List;
import java.util.Map;
import org.springframework.lang.Nullable;
/**
* Extension of the {@code Map} interface that stores multiple values.
*
* @author Arjen Poutsma
* @since 3.0
* @param <K> the key type
* @param <V> the value element type
*/
public interface MultiValueMap<K, V> extends Map<K, List<V>> {
/**
* Return the first value for the given key.
* @param key the key
* @return the first value for the specified key, or {@code null} if none
*/
@Nullable
V getFirst(K key);
/**
* Add the given single value to the current list of values for the given key.
* @param key the key
* @param value the value to be added
*/
void add(K key, @Nullable V value);
/**
* Add all the values of the given list to the current list of values for the given key.
* @param key they key
* @param values the values to be added
* @since 5.0
*/
void addAll(K key, List<? extends V> values);
/**
* Add all the values of the given {@code MultiValueMap} to the current values.
* @param values the values to be added
* @since 5.0
*/
void addAll(MultiValueMap<K, V> values);
/**
* {@link #add(Object, Object) Add} the given value, only when the map does not
* {@link #containsKey(Object) contain} the given key.
* @param key the key
* @param value the value to be added
* @since 5.2
*/
default void addIfAbsent(K key, @Nullable V value) {
if (!containsKey(key)) {
add(key, value);
}
}
/**
* Set the given single value under the given key.
* @param key the key
* @param value the value to set
*/
void set(K key, @Nullable V value);
/**
* Set the given values under.
* @param values the values.
*/
void setAll(Map<K, V> values);
/**
* Return a {@code Map} with the first values contained in this {@code MultiValueMap}.
* @return a single value representation of this map
*/
Map<K, V> toSingleValueMap();
}
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