org.gbif.utils.collection

Class MapUtils

java.lang.Object

org.gbif.utils.collection.MapUtils

public class MapUtils
extends Object

Method Summary

Modifier and Type	Method and Description
static <K,V> V	getOrDefault(Map<K,V> map, K key, V defaultValue) Returns a maps value or a given default if not present.
static <K,V extends Comparable<? super V>> Map<K,V>	sortByValue(Map<K,V> map) This orders a Map by its values and returns a new LinkedHashMap which maintains that order.
static <K,V> Map<K,V>	sortByValue(Map<K,V> map, Comparator<V> comparator) Order a Map by its values using the given value comparator and return a new LinkedHashMap which maintains that order.

Methods inherited from class java.lang.Object

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

Method Detail

sortByValue

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

This orders a Map by its values and returns a new LinkedHashMap which maintains that order.

Type Parameters:

K - type of the map key

V - type of the map value, this needs to implement Comparable

Parameters:

map - to sort

Returns:

a map ordered by the values of the input map

sortByValue

public static <K,V> Map<K,V> sortByValue(Map<K,V> map,
                                         Comparator<V> comparator)

Order a Map by its values using the given value comparator and return a new LinkedHashMap which maintains that order.

Type Parameters:

K - type of the map key

V - type of the map value

Parameters:

map - to sort

Returns:

a map ordered by the values of the input map

getOrDefault

public static <K,V> V getOrDefault(Map<K,V> map,
                                   K key,
                                   V defaultValue)

Returns a maps value or a given default if not present. For pre java8 code since j8 introduced Map.getOrDefault.