Class CollectionUtil


public class CollectionUtil extends Object
  • Constructor Details

    • CollectionUtil

      public CollectionUtil()
  • Method Details

    • powerSet

      public static <T> Set<Set<T>> powerSet(Collection<T> originalSet)
    • permutations

      public static <T> List<Map<String,T>> permutations(Map<String,List<T>> parameterValues)
    • createIfNull

      @Deprecated public static <T> List<T> createIfNull(List<T> currentValue)
      use CollectionUtils instead
      Returns passed currentValue if it is not null and creates a new ArrayList if it is null.

      Example: values = createIfNull(values)
    • createIfNull

      @Deprecated public static <T> T[] createIfNull(T[] arguments)
      use CollectionUtils instead
      Returns a new empty array if the passed array is null.
    • createIfNull

      @Deprecated public static <T> Set<T> createIfNull(Set<T> currentValue)
      use CollectionUtils instead
      Returns a new empty set if the passed set is null.
    • createIfNull

      @Deprecated public static <T, E> Map<T,E> createIfNull(Map<T,E> currentValue)
      use CollectionUtils instead
      Returns a new empty map if the passed map is null.
    • flatten

      public static Map<String,Object> flatten(Map<String,Object> map)
      Converts a set of nested maps (like from yaml/json) into a flat map with dot-separated properties
    • findKeyInMapIgnoreCase

      public static String findKeyInMapIgnoreCase(String key, Map<String,Object> map)
      Find the actual key in a map, by searching the keys in the map and checking them ignoring case.
      key - the key to search for, in any case
      map - the map in which to search
      the properly cased key, if found, or null if not found