org.aksw.commons.collections.multimaps

Class MultimapUtils

java.lang.Object

org.aksw.commons.collections.multimaps.MultimapUtils

public class MultimapUtils
extends Object

Created by IntelliJ IDEA. User: raven Date: 4/25/11 Time: 9:26 PM To change this template use File | Settings | File Templates.

Constructor Summary

Constructors

Constructor and Description
MultimapUtils()

Method Summary

Modifier and Type	Method and Description
static <K,V> Set<V>	getAll(com.google.common.collect.Multimap<K,V> multiMap, Collection<K> keys)
static <G,T> com.google.common.collect.Multimap<G,T>	groupBy(Iterable<T> items, java.util.function.Function<T,G> itemToGroupKey, com.google.common.collect.Multimap<G,T> result)
static <K,V> com.google.common.collect.ListMultimap<K,V>	newIdentityListMultimap()
static <K,V> com.google.common.collect.SetMultimap<K,V>	newIdentitySetMultimap()
static <K,V> com.google.common.collect.SetMultimap<K,V>	newSetMultimap(boolean identityKeys, boolean identityValues)
static <K,V> Map<K,V>	toMap(Map<K,? extends Collection<V>> mm) Helper function to convert a multimap into a map.
static <T> Set<T>	transitiveGetBoth(IBiSetMultimap<T,T> map, Object key) A transitive get in both directions

Methods inherited from class java.lang.Object

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

Constructor Detail

MultimapUtils

public MultimapUtils()

Method Detail

groupBy

public static <G,T> com.google.common.collect.Multimap<G,T> groupBy(Iterable<T> items,
                                                                    java.util.function.Function<T,G> itemToGroupKey,
                                                                    com.google.common.collect.Multimap<G,T> result)

newSetMultimap

public static <K,V> com.google.common.collect.SetMultimap<K,V> newSetMultimap(boolean identityKeys,
                                                                              boolean identityValues)

newIdentitySetMultimap

public static <K,V> com.google.common.collect.SetMultimap<K,V> newIdentitySetMultimap()

newIdentityListMultimap

public static <K,V> com.google.common.collect.ListMultimap<K,V> newIdentityListMultimap()

getAll

public static <K,V> Set<V> getAll(com.google.common.collect.Multimap<K,V> multiMap,
                                  Collection<K> keys)

transitiveGetBoth

public static <T> Set<T> transitiveGetBoth(IBiSetMultimap<T,T> map,
                                           Object key)

A transitive get in both directions

Parameters:

map -

toMap

public static <K,V> Map<K,V> toMap(Map<K,? extends Collection<V>> mm)

Helper function to convert a multimap into a map. Each key may only have at most one corresponding value, otherwise an exception will be thrown.

Parameters:

mm -

Returns: