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/*
 * Copyright 2002-2020 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.io.Serializable;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

/**
 * Simple implementation of {@link MultiValueMap} that wraps a {@link LinkedHashMap},
 * storing multiple values in a {@link LinkedList}.
 *
 * 

This Map implementation is generally not thread-safe. It is primarily designed * for data structures exposed from request objects, for use in a single thread only. * * @author Arjen Poutsma * @author Juergen Hoeller * @since 3.0 * @param the key type * @param the value element type */ public class LinkedMultiValueMap extends MultiValueMapAdapter implements Serializable, Cloneable { private static final long serialVersionUID = 3801124242820219131L; /** * Create a new LinkedMultiValueMap that wraps a {@link LinkedHashMap}. */ public LinkedMultiValueMap() { super(new LinkedHashMap<>()); } /** * Create a new LinkedMultiValueMap that wraps a {@link LinkedHashMap} * with the given initial capacity. * @param initialCapacity the initial capacity */ public LinkedMultiValueMap(int initialCapacity) { super(new LinkedHashMap<>(initialCapacity)); } /** * Copy constructor: Create a new LinkedMultiValueMap with the same mappings as * the specified Map. Note that this will be a shallow copy; its value-holding * List entries will get reused and therefore cannot get modified independently. * @param otherMap the Map whose mappings are to be placed in this Map * @see #clone() * @see #deepCopy() */ public LinkedMultiValueMap(Map> otherMap) { super(new LinkedHashMap<>(otherMap)); } /** * Create a deep copy of this Map. * @return a copy of this Map, including a copy of each value-holding List entry * (consistently using an independent modifiable {@link LinkedList} for each entry) * along the lines of {@code MultiValueMap.addAll} semantics * @since 4.2 * @see #addAll(MultiValueMap) * @see #clone() */ public LinkedMultiValueMap deepCopy() { LinkedMultiValueMap copy = new LinkedMultiValueMap<>(size()); forEach((key, values) -> copy.put(key, new LinkedList<>(values))); return copy; } /** * Create a regular copy of this Map. * @return a shallow copy of this Map, reusing this Map's value-holding List entries * (even if some entries are shared or unmodifiable) along the lines of standard * {@code Map.put} semantics * @since 4.2 * @see #put(Object, List) * @see #putAll(Map) * @see LinkedMultiValueMap#LinkedMultiValueMap(Map) * @see #deepCopy() */ @Override public LinkedMultiValueMap clone() { return new LinkedMultiValueMap<>(this); } }





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