Package groovy.util

Class GroovyCollections

java.lang.Object
groovy.util.GroovyCollections
public class GroovyCollections
extends Object
A Collections utility class

  • Constructor Details

    • GroovyCollections

      public GroovyCollections()

  • Method Details

    • combinations

      public static List combinations​(Object[] collections)
      Finds all combinations of items from the given collections.
      Parameters:
      collections - the given collections
      Returns:
      a List of the combinations found
      See Also:
      combinations(Collection)

    • subsequences

      public static <T> Set<List<T>> subsequences​(List<T> items)
      Finds all non-null subsequences of a list. E.g. subsequences([1, 2, 3]) would be: [[1, 2, 3], [1, 3], [2, 3], [1, 2], [1], [2], [3]]
      Parameters:
      items - the List of items
      Returns:
      the subsequences from items

    • combinations

      @Deprecated public static List combinations​(Collection collections)
      Deprecated.
      use combinations(Iterable)
      Parameters:
      collections - the given collections

    • combinations

      public static List combinations​(Iterable collections)
      Finds all combinations of items from the given Iterable aggregate of collections. So, combinations([[true, false], [true, false]]) is [[true, true], [false, true], [true, false], [false, false]] and combinations([['a', 'b'],[1, 2, 3]]) is [['a', 1], ['b', 1], ['a', 2], ['b', 2], ['a', 3], ['b', 3]]. If a non-collection item is given, it is treated as a singleton collection, i.e. combinations([[1, 2], 'x']) is [[1, 'x'], [2, 'x']]. If an empty collection is found within the given collections, the result will be an empty list.
      Parameters:
      collections - the Iterable of given collections
      Returns:
      a List of the combinations found
      Since:
      2.2.0

    • inits

      public static <T> List<List<T>> inits​(Iterable<T> collections)

    • tails

      public static <T> List<List<T>> tails​(Iterable<T> collections)

    • transpose

      public static List transpose​(Object[] lists)
      Transposes an array of lists.
      Parameters:
      lists - the given lists
      Returns:
      a List of the transposed lists
      See Also:
      transpose(List)

    • transpose

      public static List transpose​(List lists)
      Transposes the given lists. So, transpose([['a', 'b'], [1, 2]]) is [['a', 1], ['b', 2]] and transpose([['a', 'b', 'c']]) is [['a'], ['b'], ['c']].
      Parameters:
      lists - the given lists
      Returns:
      a List of the transposed lists

    • min

      public static <T> T min​(T[] items)
      Selects the minimum value found in an array of items, so min([2, 4, 6] as Object[]) == 2.
      Parameters:
      items - an array of items
      Returns:
      the minimum value

    • min

      @Deprecated public static <T> T min​(Collection<T> items)
      Deprecated.
      use min(Iterable)

    • min

      public static <T> T min​(Iterable<T> items)
      Selects the minimum value found in an Iterable of items.
      Parameters:
      items - an Iterable
      Returns:
      the minimum value
      Since:
      2.2.0

    • max

      public static <T> T max​(T[] items)
      Selects the maximum value found in an array of items, so max([2, 4, 6] as Object[]) == 6.
      Parameters:
      items - an array of items
      Returns:
      the maximum value

    • max

      @Deprecated public static <T> T max​(Collection<T> items)
      Deprecated.
      use max(Iterable)

    • max

      public static <T> T max​(Iterable<T> items)
      Selects the maximum value found in an Iterable.
      Parameters:
      items - a Collection
      Returns:
      the maximum value
      Since:
      2.2.0

    • sum

      public static Object sum​(Object[] items)
      Sums all the items from an array of items.
      Parameters:
      items - an array of items
      Returns:
      the sum of the items

    • sum

      @Deprecated public static Object sum​(Collection items)
      Deprecated.
      use sum(Iterable)

    • sum

      public static Object sum​(Iterable<?> items)
      Sums all the given items.
      Parameters:
      items - an Iterable of items
      Returns:
      the sum of the item
      Since:
      2.2.0