org.springframework.util

Class LinkedCaseInsensitiveMap<V>

java.lang.Object

java.util.AbstractMap<K,V>

java.util.HashMap<K,V>

java.util.LinkedHashMap<String,V>

org.springframework.util.LinkedCaseInsensitiveMap<V>

All Implemented Interfaces:

Serializable, Cloneable, Map<String,V>

public class LinkedCaseInsensitiveMap<V>
extends LinkedHashMap<String,V>

LinkedHashMap variant that stores String keys in a case-insensitive manner, for example for key-based access in a results table.

Preserves the original order as well as the original casing of keys, while allowing for contains, get and remove calls with any case of key.

Does not support null keys.

Since:

3.0

Author:

Juergen Hoeller

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class java.util.AbstractMap

AbstractMap.SimpleEntry<K,V>, AbstractMap.SimpleImmutableEntry<K,V>

Constructor Summary

Constructors

Constructor and Description
LinkedCaseInsensitiveMap() Create a new LinkedCaseInsensitiveMap for the default Locale.
LinkedCaseInsensitiveMap(int initialCapacity) Create a new LinkedCaseInsensitiveMap that wraps a LinkedHashMap with the given initial capacity and stores lower-case keys according to the default Locale.
LinkedCaseInsensitiveMap(int initialCapacity, Locale locale) Create a new LinkedCaseInsensitiveMap that wraps a LinkedHashMap with the given initial capacity and stores lower-case keys according to the given Locale.
LinkedCaseInsensitiveMap(Locale locale) Create a new LinkedCaseInsensitiveMap that stores lower-case keys according to the given Locale.

Method Summary

Modifier and Type	Method and Description
void	clear()
boolean	containsKey(Object key)
protected String	convertKey(String key) Convert the given key to a case-insensitive key.
V	get(Object key)
V	getOrDefault(Object key, V defaultValue)
V	put(String key, V value)
void	putAll(Map<? extends String,? extends V> map)
V	remove(Object key)

Methods inherited from class java.util.LinkedHashMap

containsValue, entrySet, forEach, keySet, removeEldestEntry, replaceAll, values

Methods inherited from class java.util.HashMap

clone, compute, computeIfAbsent, computeIfPresent, isEmpty, merge, putIfAbsent, remove, replace, replace, size

Methods inherited from class java.util.AbstractMap

equals, hashCode, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, equals, hashCode, isEmpty, merge, putIfAbsent, remove, replace, replace, size

Constructor Detail

LinkedCaseInsensitiveMap

public LinkedCaseInsensitiveMap()

Create a new LinkedCaseInsensitiveMap for the default Locale.

See Also:

String.toLowerCase()

LinkedCaseInsensitiveMap

public LinkedCaseInsensitiveMap(Locale locale)

Create a new LinkedCaseInsensitiveMap that stores lower-case keys according to the given Locale.

Parameters:

locale - the Locale to use for lower-case conversion

See Also:

String.toLowerCase(java.util.Locale)

LinkedCaseInsensitiveMap

public LinkedCaseInsensitiveMap(int initialCapacity)

Create a new LinkedCaseInsensitiveMap that wraps a LinkedHashMap with the given initial capacity and stores lower-case keys according to the default Locale.

Parameters:

initialCapacity - the initial capacity

See Also:

String.toLowerCase()

LinkedCaseInsensitiveMap

public LinkedCaseInsensitiveMap(int initialCapacity,
                                Locale locale)

Create a new LinkedCaseInsensitiveMap that wraps a LinkedHashMap with the given initial capacity and stores lower-case keys according to the given Locale.

Parameters:

initialCapacity - the initial capacity

locale - the Locale to use for lower-case conversion

See Also:

String.toLowerCase(java.util.Locale)

Method Detail

put

public V put(String key,
             V value)

Specified by:

put in interface Map<String,V>

Overrides:

put in class HashMap<String,V>

putAll

public void putAll(Map<? extends String,? extends V> map)

Specified by:

putAll in interface Map<String,V>

Overrides:

putAll in class HashMap<String,V>

containsKey

public boolean containsKey(Object key)

Specified by:

containsKey in interface Map<String,V>

Overrides:

containsKey in class HashMap<String,V>

get

public V get(Object key)

Specified by:

get in interface Map<String,V>

Overrides:

get in class LinkedHashMap<String,V>

getOrDefault

public V getOrDefault(Object key,
                      V defaultValue)

Specified by:

getOrDefault in interface Map<String,V>

Overrides:

getOrDefault in class LinkedHashMap<String,V>

remove

public V remove(Object key)

Specified by:

remove in interface Map<String,V>

Overrides:

remove in class HashMap<String,V>

clear

public void clear()

Specified by:

clear in interface Map<String,V>

Overrides:

clear in class LinkedHashMap<String,V>

convertKey

protected String convertKey(String key)

Convert the given key to a case-insensitive key.

The default implementation converts the key to lower-case according to this Map's Locale.

Parameters:

key - the user-specified key

Returns:

the key to use for storing

See Also:

String.toLowerCase(java.util.Locale)