Package org.springframework.util

Class LinkedCaseInsensitiveMap<V>

java.lang.Object

org.springframework.util.LinkedCaseInsensitiveMap<V>

Type Parameters:

V - the value type

All Implemented Interfaces:

Serializable, Cloneable, Map<String,V>

public class LinkedCaseInsensitiveMap<V>
extends Object
implements Map<String,V>, Serializable, Cloneable

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, Phillip Webb

See Also:

• Serialized Form

Nested Class Summary

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

Map.Entry<K extends Object,V extends Object>

Constructor Summary

Constructors

Constructor	Description
LinkedCaseInsensitiveMap()	Create a new LinkedCaseInsensitiveMap that stores case-insensitive keys according to the default Locale (by default in lower case).
LinkedCaseInsensitiveMap(int expectedSize)	Create a new LinkedCaseInsensitiveMap that wraps a LinkedHashMap with an initial capacity that can accommodate the specified number of elements without any immediate resize/rehash operations to be expected, storing case-insensitive keys according to the default Locale (in lower case).
LinkedCaseInsensitiveMap(int expectedSize, Locale locale)	Create a new LinkedCaseInsensitiveMap that wraps a LinkedHashMap with an initial capacity that can accommodate the specified number of elements without any immediate resize/rehash operations to be expected, storing case-insensitive keys according to the given Locale (in lower case).
LinkedCaseInsensitiveMap(Locale locale)	Create a new LinkedCaseInsensitiveMap that stores case-insensitive keys according to the given Locale (in lower case).

Method Summary

Modifier and Type	Method	Description
void	clear()
LinkedCaseInsensitiveMap<V>	clone()
V	computeIfAbsent(String key, Function<? super String,? extends V> mappingFunction)
boolean	containsKey(Object key)
boolean	containsValue(Object value)
protected String	convertKey(String key)	Convert the given key to a case-insensitive key.
Set<Map.Entry<String,V>>	entrySet()
boolean	equals(Object other)
V	get(Object key)
Locale	getLocale()	Return the locale used by this LinkedCaseInsensitiveMap.
V	getOrDefault(Object key, V defaultValue)
int	hashCode()
boolean	isEmpty()
Set<String>	keySet()
V	put(String key, V value)
void	putAll(Map<? extends String,? extends V> map)
V	putIfAbsent(String key, V value)
V	remove(Object key)
protected boolean	removeEldestEntry(Map.Entry<String,V> eldest)	Determine whether this map should remove the given eldest entry.
int	size()
String	toString()
Collection<V>	values()

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map

compute, computeIfPresent, forEach, merge, remove, replace, replace, replaceAll

Constructor Details

LinkedCaseInsensitiveMap

public LinkedCaseInsensitiveMap()

Create a new LinkedCaseInsensitiveMap that stores case-insensitive keys according to the default Locale (by default in lower case).

See Also:

• convertKey(String)

LinkedCaseInsensitiveMap

public LinkedCaseInsensitiveMap(@Nullable
 Locale locale)

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

Parameters:

locale - the Locale to use for case-insensitive key conversion

See Also:

• convertKey(String)

LinkedCaseInsensitiveMap

public LinkedCaseInsensitiveMap(int expectedSize)

Create a new LinkedCaseInsensitiveMap that wraps a LinkedHashMap with an initial capacity that can accommodate the specified number of elements without any immediate resize/rehash operations to be expected, storing case-insensitive keys according to the default Locale (in lower case).

Parameters:

expectedSize - the expected number of elements (with a corresponding capacity to be derived so that no resize/rehash operations are needed)

See Also:

• CollectionUtils.newHashMap(int)
• convertKey(String)

LinkedCaseInsensitiveMap

public LinkedCaseInsensitiveMap(int expectedSize,
 @Nullable
 Locale locale)

Create a new LinkedCaseInsensitiveMap that wraps a LinkedHashMap with an initial capacity that can accommodate the specified number of elements without any immediate resize/rehash operations to be expected, storing case-insensitive keys according to the given Locale (in lower case).

Parameters:

expectedSize - the expected number of elements (with a corresponding capacity to be derived so that no resize/rehash operations are needed)

locale - the Locale to use for case-insensitive key conversion

See Also:

• CollectionUtils.newHashMap(int)
• convertKey(String)

Method Details

size

public int size()

Specified by:

size in interface Map<String,V>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Map<String,V>

containsKey

public boolean containsKey(Object key)

Specified by:

containsKey in interface Map<String,V>

containsValue

public boolean containsValue(Object value)

Specified by:

containsValue in interface Map<String,V>

get

@Nullable
public V get(Object key)

Specified by:

get in interface Map<String,V>

getOrDefault

@Nullable
public V getOrDefault(Object key,
 V defaultValue)

Specified by:

getOrDefault in interface Map<String,V>

put

@Nullable
public V put(String key,
 @Nullable
 V value)

Specified by:

put in interface Map<String,V>

putAll

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

Specified by:

putAll in interface Map<String,V>

putIfAbsent

@Nullable
public V putIfAbsent(String key,
 @Nullable
 V value)

Specified by:

putIfAbsent in interface Map<String,V>

computeIfAbsent

@Nullable
public V computeIfAbsent(String key,
 Function<? super String,? extends V> mappingFunction)

Specified by:

computeIfAbsent in interface Map<String,V>

remove

@Nullable
public V remove(Object key)

Specified by:

remove in interface Map<String,V>

clear

public void clear()

Specified by:

clear in interface Map<String,V>

keySet

public Set<String> keySet()

Specified by:

keySet in interface Map<String,V>

values

public Collection<V> values()

Specified by:

values in interface Map<String,V>

entrySet

public Set<Map.Entry<String,V>> entrySet()

Specified by:

entrySet in interface Map<String,V>

clone

public LinkedCaseInsensitiveMap<V> clone()

Overrides:

clone in class Object

equals

public boolean equals(@Nullable
 Object other)

Specified by:

equals in interface Map<String,V>

Overrides:

equals in class Object

hashCode

public int hashCode()

Specified by:

hashCode in interface Map<String,V>

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object

getLocale

public Locale getLocale()

Return the locale used by this LinkedCaseInsensitiveMap. Used for case-insensitive key conversion.

Since:

4.3.10

See Also:

• LinkedCaseInsensitiveMap(Locale)
• convertKey(String)

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(Locale)

removeEldestEntry

protected boolean removeEldestEntry(Map.Entry<String,V> eldest)

Determine whether this map should remove the given eldest entry.

Parameters:

eldest - the candidate entry

Returns:

true for removing it, false for keeping it

See Also:

• LinkedHashMap.removeEldestEntry(java.util.Map.Entry<K, V>)