net.dontdrinkandroot.utils.collections
Class CollectionUtils

java.lang.Object
  org.apache.commons.collections15.CollectionUtils
      net.dontdrinkandroot.utils.collections.CollectionUtils

public class CollectionUtils
extends org.apache.commons.collections15.CollectionUtils

Field Summary

Fields inherited from class org.apache.commons.collections15.CollectionUtils

EMPTY_COLLECTION

Constructor Summary

CollectionUtils()

Method Summary

static <K,V> void	addToMapList(K key, V value, java.util.Map<K,java.util.List<V>> map)
static <K,V> void	addToMapSet(K key, V value, java.util.Map<K,java.util.Set<V>> map)
static <T extends java.lang.Number> AggregationResult	aggregate(java.util.Collection<T> collection)
static <K,V extends java.lang.Comparable<? super V>> java.util.SortedSet<java.util.Map.Entry<K,V>>	entriesSortedByValues(java.util.Map<K,V> map)
static <K,V extends java.lang.Comparable<? super V>> java.util.SortedSet<java.util.Map.Entry<K,V>>	entriesSortedByValuesInverse(java.util.Map<K,V> map)
static <T> T	first(java.lang.Iterable<T> iterable)
static <T extends java.lang.Number> double	getMean(java.util.Collection<T> collection)
static <V> V	getRandom(java.util.Collection<V> collection)
static boolean	isEmpty(java.lang.Object obj) Nullsafe check if a collection is empty.

Methods inherited from class org.apache.commons.collections15.CollectionUtils

addAll, addAll, addAll, cardinality, collect, collect, collect, collect, containsAny, countMatches, disjunction, exists, filter, find, forAllDo, get, getCardinalityMap, index, index, intersection, isEqualCollection, isFull, isProperSubCollection, isSubCollection, main, maxSize, predicatedCollection, reverseArray, select, select, selectRejected, selectRejected, size, subtract, synchronizedCollection, transform, transformedCollection, typedCollection, union, unmodifiableCollection

Methods inherited from class java.lang.Object

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

Constructor Detail

CollectionUtils

public CollectionUtils()

Method Detail

aggregate

public static <T extends java.lang.Number> AggregationResult aggregate(java.util.Collection<T> collection)

getMean

public static <T extends java.lang.Number> double getMean(java.util.Collection<T> collection)

first

public static <T> T first(java.lang.Iterable<T> iterable)

isEmpty

public static boolean isEmpty(java.lang.Object obj)

Nullsafe check if a collection is empty.

Parameters:

obj - Null or a subclass of Collection.

Throws:

java.lang.IllegalArgumentException - Thrown if obj is not null and not an instance of Collection.

addToMapList

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

addToMapSet

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

getRandom

public static <V> V getRandom(java.util.Collection<V> collection)

entriesSortedByValues

public static <K,V extends java.lang.Comparable<? super V>> java.util.SortedSet<java.util.Map.Entry<K,V>> entriesSortedByValues(java.util.Map<K,V> map)

entriesSortedByValuesInverse

public static <K,V extends java.lang.Comparable<? super V>> java.util.SortedSet<java.util.Map.Entry<K,V>> entriesSortedByValuesInverse(java.util.Map<K,V> map)