org.springframework.util

Class LinkedMultiValueMap<K,V>

java.lang.Object

org.springframework.util.LinkedMultiValueMap<K,V>

All Implemented Interfaces:

java.io.Serializable, java.util.Map<K,java.util.List<V>>, MultiValueMap<K,V>

public class LinkedMultiValueMap<K,V>
extends java.lang.Object
implements MultiValueMap<K,V>, java.io.Serializable

Simple implementation of MultiValueMap that wraps a LinkedHashMap, storing multiple values in a 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.

Since:

3.0

Author:

Arjen Poutsma, Juergen Hoeller

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface java.util.Map

java.util.Map.Entry<K,V>

Field Summary

Fields

Modifier and Type	Field and Description
private static long	serialVersionUID
private java.util.Map<K,java.util.List<V>>	targetMap

Constructor Summary

Constructors

Constructor and Description
LinkedMultiValueMap() Create a new LinkedMultiValueMap that wraps a LinkedHashMap.
LinkedMultiValueMap(int initialCapacity) Create a new LinkedMultiValueMap that wraps a LinkedHashMap with the given initial capacity.
LinkedMultiValueMap(java.util.Map<K,java.util.List<V>> otherMap) Copy constructor: Create a new LinkedMultiValueMap with the same mappings as the specified Map.

Method Summary

Modifier and Type	Method and Description
void	add(K key, V value) Add the given single value to the current list of values for the given key.
void	clear()
LinkedMultiValueMap<K,V>	clone() Create a regular copy of this Map.
boolean	containsKey(java.lang.Object key)
boolean	containsValue(java.lang.Object value)
LinkedMultiValueMap<K,V>	deepCopy() Create a deep copy of this Map.
java.util.Set<java.util.Map.Entry<K,java.util.List<V>>>	entrySet()
boolean	equals(java.lang.Object obj)
java.util.List<V>	get(java.lang.Object key)
V	getFirst(K key) Return the first value for the given key.
int	hashCode()
boolean	isEmpty()
java.util.Set<K>	keySet()
java.util.List<V>	put(K key, java.util.List<V> value)
void	putAll(java.util.Map<? extends K,? extends java.util.List<V>> map)
java.util.List<V>	remove(java.lang.Object key)
void	set(K key, V value) Set the given single value under the given key.
void	setAll(java.util.Map<K,V> values) Set the given values under.
int	size()
java.util.Map<K,V>	toSingleValueMap() Returns the first values contained in this MultiValueMap.
java.lang.String	toString()
java.util.Collection<java.util.List<V>>	values()

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, forEach, getOrDefault, merge, putIfAbsent, remove, replace, replace, replaceAll

Field Detail

serialVersionUID

private static final long serialVersionUID

See Also:

Constant Field Values

targetMap

private final java.util.Map<K,java.util.List<V>> targetMap

Constructor Detail

LinkedMultiValueMap

public LinkedMultiValueMap()

Create a new LinkedMultiValueMap that wraps a LinkedHashMap.

LinkedMultiValueMap

public LinkedMultiValueMap(int initialCapacity)

Create a new LinkedMultiValueMap that wraps a LinkedHashMap with the given initial capacity.

Parameters:

initialCapacity - the initial capacity

LinkedMultiValueMap

public LinkedMultiValueMap(java.util.Map<K,java.util.List<V>> otherMap)

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.

Parameters:

otherMap - the Map whose mappings are to be placed in this Map

See Also:

clone(), deepCopy()

Method Detail

add

public void add(K key,
                V value)

Description copied from interface: MultiValueMap

Add the given single value to the current list of values for the given key.

Specified by:

add in interface MultiValueMap<K,V>

Parameters:

key - the key

value - the value to be added

getFirst

public V getFirst(K key)

Description copied from interface: MultiValueMap

Return the first value for the given key.

Specified by:

getFirst in interface MultiValueMap<K,V>

Parameters:

key - the key

Returns:

the first value for the specified key, or null

set

public void set(K key,
                V value)

Description copied from interface: MultiValueMap

Set the given single value under the given key.

Specified by:

set in interface MultiValueMap<K,V>

Parameters:

key - the key

value - the value to set

setAll

public void setAll(java.util.Map<K,V> values)

Description copied from interface: MultiValueMap

Set the given values under.

Specified by:

setAll in interface MultiValueMap<K,V>

Parameters:

values - the values.

toSingleValueMap

public java.util.Map<K,V> toSingleValueMap()

Description copied from interface: MultiValueMap

Returns the first values contained in this MultiValueMap.

Specified by:

toSingleValueMap in interface MultiValueMap<K,V>

Returns:

a single value representation of this map

size

public int size()

Specified by:

size in interface java.util.Map<K,java.util.List<V>>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface java.util.Map<K,java.util.List<V>>

containsKey

public boolean containsKey(java.lang.Object key)

Specified by:

containsKey in interface java.util.Map<K,java.util.List<V>>

containsValue

public boolean containsValue(java.lang.Object value)

Specified by:

containsValue in interface java.util.Map<K,java.util.List<V>>

get

public java.util.List<V> get(java.lang.Object key)

Specified by:

get in interface java.util.Map<K,java.util.List<V>>

put

public java.util.List<V> put(K key,
                             java.util.List<V> value)

Specified by:

put in interface java.util.Map<K,java.util.List<V>>

remove

public java.util.List<V> remove(java.lang.Object key)

Specified by:

remove in interface java.util.Map<K,java.util.List<V>>

putAll

public void putAll(java.util.Map<? extends K,? extends java.util.List<V>> map)

Specified by:

putAll in interface java.util.Map<K,java.util.List<V>>

clear

public void clear()

Specified by:

clear in interface java.util.Map<K,java.util.List<V>>

keySet

public java.util.Set<K> keySet()

Specified by:

keySet in interface java.util.Map<K,java.util.List<V>>

values

public java.util.Collection<java.util.List<V>> values()

Specified by:

values in interface java.util.Map<K,java.util.List<V>>

entrySet

public java.util.Set<java.util.Map.Entry<K,java.util.List<V>>> entrySet()

Specified by:

entrySet in interface java.util.Map<K,java.util.List<V>>

clone

public LinkedMultiValueMap<K,V> clone()

Create a regular copy of this Map.

Overrides:

clone in class java.lang.Object

Returns:

a shallow copy of this Map, reusing this Map's value-holding List entries

Since:

4.2

See Also:

LinkedMultiValueMap(Map), deepCopy()

deepCopy

public LinkedMultiValueMap<K,V> deepCopy()

Create a deep copy of this Map.

Returns:

a copy of this Map, including a copy of each value-holding List entry

Since:

4.2

See Also:

clone()

equals

public boolean equals(java.lang.Object obj)

Specified by:

equals in interface java.util.Map<K,java.util.List<V>>

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Specified by:

hashCode in interface java.util.Map<K,java.util.List<V>>

Overrides:

hashCode in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object