Package org.utils.datastructures

Class Aggregate

  • public class Aggregate
extends java.lang.Object

    • Nested Class Summary

      Nested Classes 
      Modifier and Type Class Description
      static interface  Aggregate.Function<T,​R>  

    • Constructor Summary

      Constructors 
      Constructor Description
      Aggregate()  

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static <K,​V>
      java.util.Map<K,​java.lang.Double>      		 avg​(java.util.Collection<V> items, Aggregate.Function<V,​K> groupFunction, Aggregate.Function<V,​java.lang.Double> doubleGetter)  
      static <K,​V>
      java.util.Map<K,​java.util.List<V>>      		 group​(java.util.Collection<V> items, Aggregate.Function<V,​K> groupFunction)  
      static <K,​V>
      java.util.Map<K,​V>      		 max​(java.util.Collection<V> items, Aggregate.Function<V,​K> groupFunction, java.util.Comparator<V> comparator)  
      static <K,​V>
      java.util.Map<K,​java.lang.Integer>      		 sum​(java.util.Collection<V> items, Aggregate.Function<V,​K> groupFunction, Aggregate.Function<V,​java.lang.Integer> intGetter)  

      • Methods inherited from class java.lang.Object

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

    • Constructor Detail

      • Aggregate

        public Aggregate()

    • Method Detail

      • group

        public static <K,​V> java.util.Map<K,​java.util.List<V>> group​(java.util.Collection<V> items,
                                                                         Aggregate.Function<V,​K> groupFunction)

      • sum

        public static <K,​V> java.util.Map<K,​java.lang.Integer> sum​(java.util.Collection<V> items,
                                                                       Aggregate.Function<V,​K> groupFunction,
                                                                       Aggregate.Function<V,​java.lang.Integer> intGetter)

      • avg

        public static <K,​V> java.util.Map<K,​java.lang.Double> avg​(java.util.Collection<V> items,
                                                                      Aggregate.Function<V,​K> groupFunction,
                                                                      Aggregate.Function<V,​java.lang.Double> doubleGetter)

      • max

        public static <K,​V> java.util.Map<K,​V> max​(java.util.Collection<V> items,
                                                       Aggregate.Function<V,​K> groupFunction,
                                                       java.util.Comparator<V> comparator)