de.alpharogroup.collections.map

Class MapExtensions

java.lang.Object

de.alpharogroup.collections.map.MapExtensions

public final class MapExtensions
extends Object

Extensions class for use with Map objects.

Version:

1.0

Author:

Asterios Raptis

Constructor Summary

Constructors

Constructor and Description
MapExtensions()

Method Summary

Modifier and Type	Method and Description
static <K,V> K	getKeyFromValue(@NonNull Map<K,V> map, V value) Returns the first founded key from the given value or null if nothing is found.
static <K,V> Collection<K>	getKeysFromValue(@NonNull Map<K,V> map, V value) Returns a Collection from all founded keys from the given value or null if nothing found.
static <K,V extends Comparable<? super V>> Map<K,V>	sortByValue(@NonNull Map<K,V> map, boolean reversed) Sort the given Map by its values and returns a sorted list by the values of the given Map
static <K,V extends Comparable<? super V>> Map<K,V>	sortByValue(@NonNull Map<K,V> map, @NonNull Comparator<? super V> comparator) Sort the given Map by its values and returns a sorted list by the values of the given Map
static <K,V extends Comparable<? super V>> List<Map.Entry<K,V>>	sortByValueAsList(@NonNull Map<K,V> map, boolean reversed) Sort the given Map by its values and returns a sorted list by the values of the given Map
static <K,V extends Comparable<? super V>> List<Map.Entry<K,V>>	sortByValueAsList(@NonNull Map<K,V> map, @NonNull Comparator<? super V> comparator) Sort the given Map by its values and returns a sorted list by the values of the given Map
static <T> Map<T,T>	toGenericMap(T[][] twoDimArray) Converts a two dimensional Array to a Map.
static Map<String,String>	toMap(String[][] twoDimArray) Converts a two dimensional String Array to a Map.

Methods inherited from class java.lang.Object

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

Constructor Detail

MapExtensions

public MapExtensions()

Method Detail

sortByValueAsList

public static <K,V extends Comparable<? super V>> List<Map.Entry<K,V>> sortByValueAsList(@NonNull
                                                                                         @NonNull Map<K,V> map,
                                                                                         boolean reversed)

Sort the given Map by its values and returns a sorted list by the values of the given Map

Type Parameters:

K - the generic type of the key

V - the generic type of the value

Parameters:

map - The Map to sort

reversed - the flag if the result should be in reversed order

Returns:

a sorted list by the values of the given Map

sortByValueAsList

public static <K,V extends Comparable<? super V>> List<Map.Entry<K,V>> sortByValueAsList(@NonNull
                                                                                         @NonNull Map<K,V> map,
                                                                                         @NonNull
                                                                                         @NonNull Comparator<? super V> comparator)

Sort the given Map by its values and returns a sorted list by the values of the given Map

Type Parameters:

K - the generic type of the key

V - the generic type of the value

Parameters:

map - The Map to sort

comparator - the comparator to sort

Returns:

a sorted list by the values of the given Map

sortByValue

public static <K,V extends Comparable<? super V>> Map<K,V> sortByValue(@NonNull
                                                                       @NonNull Map<K,V> map,
                                                                       boolean reversed)

Sort the given Map by its values and returns a sorted list by the values of the given Map

Type Parameters:

K - the generic type of the key

V - the generic type of the value

Parameters:

map - the Map to sort

reversed - the flag if the result should be in reversed order

Returns:

a sorted Map by the values of the given Map

sortByValue

public static <K,V extends Comparable<? super V>> Map<K,V> sortByValue(@NonNull
                                                                       @NonNull Map<K,V> map,
                                                                       @NonNull
                                                                       @NonNull Comparator<? super V> comparator)

Sort the given Map by its values and returns a sorted list by the values of the given Map

Type Parameters:

K - the generic type of the key

V - the generic type of the value

Parameters:

map - the Map to sort

comparator - the comparator to sort

Returns:

a sorted Map by the values of the given Map

getKeyFromValue

public static <K,V> K getKeyFromValue(@NonNull
                                      @NonNull Map<K,V> map,
                                      V value)

Returns the first founded key from the given value or null if nothing is found.

Type Parameters:

K - the generic type of the key

V - the generic type of the value

Parameters:

map - The Map.

value - The value.

Returns:

Returns the first key from the given value or null if nothing found.

getKeysFromValue

public static <K,V> Collection<K> getKeysFromValue(@NonNull
                                                   @NonNull Map<K,V> map,
                                                   V value)

Returns a Collection from all founded keys from the given value or null if nothing found.

Type Parameters:

K - the generic type of the key

V - the generic type of the value

Parameters:

map - The Map.

value - The value.

Returns:

Returns the key from the given value or an empty Collection if nothing found.

toGenericMap

public static <T> Map<T,T> toGenericMap(@NonNull
                                        T[][] twoDimArray)

Converts a two dimensional Array to a Map.

Type Parameters:

T - the generic type

Parameters:

twoDimArray - The two dimensional Array.

Returns:

The map produced from the two dimensional Array.

toMap

public static Map<String,String> toMap(String[][] twoDimArray)

Converts a two dimensional String Array to a Map.

Parameters:

twoDimArray - The two dimensional String Array.

Returns:

The map produced from the two dimensional String Array.