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MultiValueMapAdapter.java
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MultiValueMapAdapter.java
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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.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.springframework.lang.Nullable;
/**
* Adapts a given {@link Map} to the {@link MultiValueMap} contract.
*
* @author Arjen Poutsma
* @author Juergen Hoeller
* @since 5.3
* @param <K> the key type
* @param <V> the value element type
* @see CollectionUtils#toMultiValueMap
* @see LinkedMultiValueMap
*/
@SuppressWarnings("serial")
public class MultiValueMapAdapter<K, V> implements MultiValueMap<K, V>, Serializable {
private final Map<K, List<V>> targetMap;
/**
* Wrap the given target {@link Map} as a {@link MultiValueMap} adapter.
* @param targetMap the plain target {@code Map}
*/
public MultiValueMapAdapter(Map<K, List<V>> targetMap) {
Assert.notNull(targetMap, "'targetMap' must not be null");
this.targetMap = targetMap;
}
// MultiValueMap implementation
@Override
@Nullable
public V getFirst(K key) {
List<V> values = this.targetMap.get(key);
return (values != null && !values.isEmpty() ? values.get(0) : null);
}
@Override
public void add(K key, @Nullable V value) {
List<V> values = this.targetMap.computeIfAbsent(key, k -> new ArrayList<>(1));
values.add(value);
}
@Override
public void addAll(K key, List<? extends V> values) {
List<V> currentValues = this.targetMap.computeIfAbsent(key, k -> new ArrayList<>(1));
currentValues.addAll(values);
}
@Override
public void addAll(MultiValueMap<K, V> values) {
for (Entry<K, List<V>> entry : values.entrySet()) {
addAll(entry.getKey(), entry.getValue());
}
}
@Override
public void set(K key, @Nullable V value) {
List<V> values = new ArrayList<>(1);
values.add(value);
this.targetMap.put(key, values);
}
@Override
public void setAll(Map<K, V> values) {
values.forEach(this::set);
}
@Override
public Map<K, V> toSingleValueMap() {
Map<K, V> singleValueMap = CollectionUtils.newLinkedHashMap(this.targetMap.size());
this.targetMap.forEach((key, values) -> {
if (values != null && !values.isEmpty()) {
singleValueMap.put(key, values.get(0));
}
});
return singleValueMap;
}
// Map implementation
@Override
public int size() {
return this.targetMap.size();
}
@Override
public boolean isEmpty() {
return this.targetMap.isEmpty();
}
@Override
public boolean containsKey(Object key) {
return this.targetMap.containsKey(key);
}
@Override
public boolean containsValue(Object value) {
return this.targetMap.containsValue(value);
}
@Override
@Nullable
public List<V> get(Object key) {
return this.targetMap.get(key);
}
@Override
@Nullable
public List<V> put(K key, List<V> value) {
return this.targetMap.put(key, value);
}
@Override
@Nullable
public List<V> remove(Object key) {
return this.targetMap.remove(key);
}
@Override
public void putAll(Map<? extends K, ? extends List<V>> map) {
this.targetMap.putAll(map);
}
@Override
public void clear() {
this.targetMap.clear();
}
@Override
public Set<K> keySet() {
return this.targetMap.keySet();
}
@Override
public Collection<List<V>> values() {
return this.targetMap.values();
}
@Override
public Set<Entry<K, List<V>>> entrySet() {
return this.targetMap.entrySet();
}
@Override
public boolean equals(@Nullable Object other) {
return (this == other || this.targetMap.equals(other));
}
@Override
public int hashCode() {
return this.targetMap.hashCode();
}
@Override
public String toString() {
return this.targetMap.toString();
}
}