Module develop.toolkit.base
Package develop.toolkit.base.utils

Class CollectionAdvice

java.lang.Object
develop.toolkit.base.utils.CollectionAdvice
public abstract class CollectionAdvice extends Object
集合增强工具
Author:
qiushui on 2018-12-20.

  • Constructor Details

    • CollectionAdvice

      public CollectionAdvice()

  • Method Details

    • get

      public static <E> Optional<E> get(List<E> list, int index)
      获得元素

    • contains

      public static <E> boolean contains(Collection<E> collection, Object target, Function<E,?> function)
      检查元素存在

    • contains

      public static <E> boolean contains(Collection<E> collection, Object target)
      检查元素存在

    • getFirstMatch

      public static <E> Optional<E> getFirstMatch(Collection<E> collection, Object target, Function<E,?> function)
      获得第一个匹配的元素

    • getFirstMatch

      public static <E> Optional<E> getFirstMatch(Collection<E> collection, Object target)
      获得第一个匹配的元素

    • getFirstTrue

      public static <E> Optional<E> getFirstTrue(Collection<E> collection, Predicate<E> predicate)
      获得第一个判断是true的元素

    • getFirstFalse

      public static <E> Optional<E> getFirstFalse(Collection<E> collection, Predicate<E> predicate)
      获得第一个判断是false的元素

    • getAllMatch

      public static <E> List<E> getAllMatch(Collection<E> collection, Object target, Function<E,?> function)
      获得全部匹配的元素

    • allMatch

      public static <E> boolean allMatch(Collection<E> collection, Predicate<E> predicate)
      全部匹配

    • anyMatch

      public static <E> boolean anyMatch(Collection<E> collection, Predicate<E> predicate)
      任意一个匹配

    • allAccept

      public static <E> boolean allAccept(Collection<E> collection, Function<E,?> function)
      判断所有元素的处理值相等

    • grouping

      public static <E, K, V> ListInMap<K,V> grouping(Collection<E> collection, Function<E,K> keySupplier, Function<E,V> valueSupplier)
      分组

    • grouping

      public static <K, V> ListInMap<K,V> grouping(Collection<V> collection, Function<V,K> keySupplier)

    • groupingUniqueKey

      public static <K, V> Map<K,V> groupingUniqueKey(Collection<V> collection, Function<V,K> keySupplier)

    • groupingUniqueKey

      public static <E, K, V> Map<K,V> groupingUniqueKey(Collection<E> collection, Function<E,K> keySupplier, Function<E,V> valueSupplier)

    • groupingCount

      public static <E, K> Counter<K> groupingCount(Collection<E> collection, Function<E,K> keySupplier)
      分组求数量

    • union

      @SafeVarargs public static <E> Set<E> union(Collection<E>... collections)
      并集

    • intersection

      @SafeVarargs public static <E> Set<E> intersection(Collection<E> master, Collection<E>... other)
      交集

    • difference

      public static <E> Set<E> difference(Collection<E> master, Collection<E> other)
      差集

    • merge

      @SafeVarargs public static <T extends Collection<E>, E> T merge(Supplier<T> supplier, Collection<E>... collections)
      合并多集合

    • associate

      public static <E, T> ListInMap<E,T> associate(Collection<E> master, Collection<T> target, BiPredicate<E,T> predicate)
      关联 将集合target按条件与集合master配对

    • associateOne

      public static <E, T> KeyValuePairs<E,T> associateOne(Collection<E> master, Collection<T> target, BiPredicate<E,T> predicate)
      关联 （明确是单个的） 将集合target按条件与集合master配对

    • partition

      public static <E> TwoValues<List<E>,List<E>> partition(Collection<E> collection, Predicate<E> predicate)
      划分 按条件把集合拆分成满足条件和不满足条件的两个集合

    • zip

      public static <T, S> List<TwoValues<T,S>> zip(List<T> master, List<S> other)
      压缩 将两个集合的元素按索引捆绑到一起

    • pagingProcess

      public static <T> void pagingProcess(List<T> list, int size, CollectionAdvice.PagingProcessor<T> processor)
      分页处理

    • pagingProcess

      public static <T> void pagingProcess(int total, int size, BiConsumer<Integer,Integer> consumer)
      分页处理 （通过总数）

    • pagingProcess

      public static <T, R> R pagingProcess(List<T> list, int size, R initialValue, BiFunction<R,R,R> reduceFunction, CollectionAdvice.PagingReduceProcessor<T,R> processor)
      分页处理 （含返回值）

    • pagingProcess

      public static <T, R> R pagingProcess(int total, int size, R initialValue, BiFunction<R,R,R> reduceFunction, BiFunction<Integer,Integer,R> function)
      分页处理 （通过总数 含返回值）

    • sort

      public static <T, S> List<T> sort(Collection<T> master, Collection<S> sortTarget, BiPredicate<T,S> predicate)
      指定排序 把master的元素值按sortTarget的元素值排序，条件按predicate

    • sort

      public static <T, S> List<T> sort(Collection<T> master, S[] sortTarget, BiPredicate<T,S> predicate)