Package org.cyclops.cyclopscore.helper

Class CollectionHelpers

java.lang.Object

org.cyclops.cyclopscore.helper.CollectionHelpers

public final class CollectionHelpers
extends Object

Helper methods for collections.

Constructor Summary

Constructors

Constructor	Description
CollectionHelpers()

Method Summary

Modifier and Type	Method	Description
static <K, V> void	addToMapList(Map<K,List<V>> map, K key, V value)	Add the given key value pair in a map structure where multiple values for a key can exist.
static <K, V> void	addToMapSet(Map<K,Set<V>> map, K key, V value)	Add the given key value pair in a map structure where multiple values for a key can exist.
static <T extends Comparable<T>> int	compareCollection(Collection<? super T> a, Collection<? super T> b)	Compare two collections with comparable elements.
static <T> int	compareCollection(Collection<? super T> a, Collection<? super T> b, Comparator<T> comparator)	Compare two collections with a custom comparator.

Methods inherited from class java.lang.Object

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

Constructor Details

CollectionHelpers

public CollectionHelpers()

Method Details

addToMapList

public static <K,
V> void addToMapList(Map<K,List<V>> map,
 K key,
 V value)

Add the given key value pair in a map structure where multiple values for a key can exist. This will take care of making a new list into the map when one did not exist before.

Type Parameters:

K - The key type.

V - The value type.

Parameters:

map - The map.

key - The key.

value - The value.

addToMapSet

public static <K,
V> void addToMapSet(Map<K,Set<V>> map,
 K key,
 V value)

Add the given key value pair in a map structure where multiple values for a key can exist. This will take care of making a new set into the map when one did not exist before.

Type Parameters:

K - The key type.

V - The value type.

Parameters:

map - The map.

key - The key.

value - The value.

compareCollection

public static <T extends Comparable<T>> int compareCollection(Collection<? super T> a,
 Collection<? super T> b)

Compare two collections with comparable elements.

Type Parameters:

T - The type of the elements.

Parameters:

a - A first collection.

b - A second collection.

Returns:

The comparator value.

compareCollection

public static <T> int compareCollection(Collection<? super T> a,
 Collection<? super T> b,
 Comparator<T> comparator)

Compare two collections with a custom comparator.

Type Parameters:

T - The type of the elements.

Parameters:

a - A first collection.

b - A second collection.

comparator - The element comparator.

Returns:

The comparator value.