[Java] Class GroovyCollections

public class GroovyCollections
extends Object

Method Detail

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)

@Deprecated public static List combinations(Collection collections)

deprecated:

use combinations(Iterable)

Parameters:

collections - the given collections

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

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

<T> public static T max(T[] items)

Selects the maximum value found in an array of items, so min([2, 4, 6] as Object[]) == 6.

Parameters:

items - an array of items

Returns:

the maximum value

<T> @Deprecated public static T max(Collection<T> items)

deprecated:

use max(Iterable)

<T> public static 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

<T> public static 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

<T> @Deprecated public static T min(Collection<T> items)

deprecated:

use min(Iterable)

<T> public static 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

<T> public static 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

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

@Deprecated public static Object sum(Collection items)

deprecated:

use sum(Iterable)

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

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

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)

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