org.panda_lang.utilities.commons.collection

Class Maps

java.lang.Object

org.panda_lang.utilities.commons.collection.Maps

public final class Maps
extends Object

Constructor Summary

Constructors

Constructor and Description
Maps()

Method Summary

Modifier and Type	Method and Description
static <K,V> Map.Entry<K,V>	entryOf(K key, V value) Get mutable entry
static <K,V> Map.Entry<K,V>	immutableEntryOf(K key, V value) Get immutable entry
static <K,V> Map<K,V>	of(Class<K> keyType, Class<V> valueType, Object... values) Create map based on vararg parameter
static <K,V> Map<K,V>	of(Object... values) Create map based on vararg parameter
static <K,V> V	put(Map<? super K,? super V> map, K key, V value) Map.put(Object, Object) but returns the used value
static <K,V> Map<V,K>	swapped(Map<K,V> map, Supplier<Map<V,K>> mapSupplier) Swap keys with values
static <K,V> void	update(Map<K,V> map, K key, Supplier<V> defaultValue, Function<V,V> updateFunction) Update value of map

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Maps

public Maps()

Method Detail

update

public static <K,V> void update(Map<K,V> map,
                                K key,
                                Supplier<V> defaultValue,
                                Function<V,V> updateFunction)

Update value of map

Type Parameters:

K - type of key

V - type of value

Parameters:

map - the map to use

key - key of entry to update

defaultValue - default value fetcher

updateFunction - function used to fetch updated value

put

public static <K,V> V put(Map<? super K,? super V> map,
                          K key,
                          V value)

Map.put(Object, Object) but returns the used value

Type Parameters:

K - type of key

V - type of value

Parameters:

map - the map to put in

key - the key

value - the value

Returns:

the object used as value

swapped

public static <K,V> Map<V,K> swapped(Map<K,V> map,
                                     Supplier<Map<V,K>> mapSupplier)

Swap keys with values

Type Parameters:

K - type of key

V - type of value

Parameters:

map - the map to swap

mapSupplier - the supplier to get new map instance

Returns:

new swapped map

entryOf

public static <K,V> Map.Entry<K,V> entryOf(K key,
                                           V value)

Get mutable entry

Type Parameters:

K - type of key

V - type of value

Parameters:

key - key of entry

value - value of entry

Returns:

mutable entry

immutableEntryOf

public static <K,V> Map.Entry<K,V> immutableEntryOf(K key,
                                                    V value)

Get immutable entry

Type Parameters:

K - type of key

V - type of value

Parameters:

key - key of entry

value - value of entry

Returns:

immutable entry

of

public static <K,V> Map<K,V> of(Object... values)

Create map based on vararg parameter

Type Parameters:

K - type of key

V - type of value

Parameters:

values - values

Returns:

map based on the specified values

of

public static <K,V> Map<K,V> of(Class<K> keyType,
                                Class<V> valueType,
                                Object... values)

Create map based on vararg parameter

Type Parameters:

K - type of key

V - type of value

Parameters:

values - values

keyType - the class to define type of key

valueType - the class to define type of value

Returns:

map based on the specified values