de.alpharogroup.collections.map

Class MapExtensions

java.lang.Object

de.alpharogroup.collections.map.MapExtensions

public final class MapExtensions
extends java.lang.Object

Extensions class for use with Map objects.

Constructor Summary

Constructors

Constructor and Description
MapExtensions()

Method Summary

Modifier and Type	Method and Description
static <K,V> K	getKeyFromValue(@NonNull java.util.Map<K,V> map, V value) Returns the first founded key from the given value or null if nothing is found.
static <K,V> java.util.Collection<K>	getKeysFromValue(@NonNull java.util.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 java.lang.Comparable<? super V>> java.util.Map<K,V>	sortByValue(@NonNull java.util.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 java.lang.Comparable<? super V>> java.util.Map<K,V>	sortByValue(@NonNull java.util.Map<K,V> map, @NonNull java.util.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 java.lang.Comparable<? super V>> java.util.List<java.util.Map.Entry<K,V>>	sortByValueAsList(@NonNull java.util.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 java.lang.Comparable<? super V>> java.util.List<java.util.Map.Entry<K,V>>	sortByValueAsList(@NonNull java.util.Map<K,V> map, @NonNull java.util.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> java.util.Map<T,T>	toGenericMap(T[][] twoDimArray) Converts a two dimensional Array to a Map.
static java.util.Map<java.lang.String,java.lang.String>	toMap(java.lang.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 java.lang.Comparable<? super V>> java.util.List<java.util.Map.Entry<K,V>> sortByValueAsList(@NonNull
                                                                                                                       @NonNull java.util.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 java.lang.Comparable<? super V>> java.util.List<java.util.Map.Entry<K,V>> sortByValueAsList(@NonNull
                                                                                                                       @NonNull java.util.Map<K,V> map,
                                                                                                                       @NonNull
                                                                                                                       @NonNull java.util.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 java.lang.Comparable<? super V>> java.util.Map<K,V> sortByValue(@NonNull
                                                                                           @NonNull java.util.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 java.lang.Comparable<? super V>> java.util.Map<K,V> sortByValue(@NonNull
                                                                                           @NonNull java.util.Map<K,V> map,
                                                                                           @NonNull
                                                                                           @NonNull java.util.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 java.util.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> java.util.Collection<K> getKeysFromValue(@NonNull
                                                             @NonNull java.util.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> java.util.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 java.util.Map<java.lang.String,java.lang.String> toMap(java.lang.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.