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Add MultiValueMap.addIfAbsent method

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Closes gh-23111
This commit is contained in:
Phillip Webb
2019-06-11 11:45:29 -07:00
parent 0757eaee9d
commit b21b27c5ac
2 changed files with 27 additions and 1 deletions
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15
spring-core/src/main/java/org/springframework/util/MultiValueMap.java
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@@ -1,5 +1,5 @@
/*
* Copyright 2002-2018 the original author or authors.
* 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.
@@ -61,6 +61,19 @@ public interface MultiValueMap<K, V> extends Map<K, List<V>> {
*/
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

13
spring-core/src/test/java/org/springframework/util/LinkedMultiValueMapTests.java
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@@ -47,6 +47,19 @@ public class LinkedMultiValueMapTests {
assertThat(map.get("key")).isEqualTo(expected);
}
@Test
public void addIfAbsentWhenAbsent() {
map.addIfAbsent("key", "value1");
assertThat(map.get("key")).containsExactly("value1");
}
@Test
public void addIfAbsentWhenPresent() {
map.add("key", "value1");
map.addIfAbsent("key", "value2");
assertThat(map.get("key")).containsExactly("value1");
}
@Test
public void set() {
map.set("key", "value1");