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Groovy 1.8.5
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groovy.util
[Java] Class GroovyCollections

java.lang.Object
  groovy.util.GroovyCollections

public class GroovyCollections
extends Object

A Collections utility class

Authors:
Paul King
Jim White

Method Summary
static List combinations(Object[] collections)

Finds all combinations of items from the given collections.
static List combinations(Collection collections)

Finds all combinations of items from the given collections.

static Object max(Object[] items)

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

Selects the maximum value found in a collection
static Object min(Object[] items)

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

Selects the minimum value found in a collection of items.
static Set subsequences(List items)

Finds all non-null subsequences of a list.

static Object sum(Object[] items)

Sums all the items from an array of items.
static Object sum(Collection items)

Sums all the items from a collection of items.
static List transpose(Object[] lists)

Transposes an array of lists.
static List transpose(List lists)

Transposes the given lists.

 
Methods inherited from class Object
wait, wait, wait, equals, toString, hashCode, getClass, notify, notifyAll
 

Method Detail

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)

combinations

public static List combinations(Collection collections)
Finds all combinations of items from the given 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']].
Parameters:
collections - the given collections
Returns:
a List of the combinations found

max

public static Object max(Object[] 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

max

public static Object max(Collection items)
Selects the maximum value found in a collection
Parameters:
items - a Collection
Returns:
the maximum value

min

public static Object min(Object[] 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

public static Object min(Collection items)
Selects the minimum value found in a collection of items.
Parameters:
items - a Collection
Returns:
the minimum value

subsequences

public static Set subsequences(List 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

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

public static Object sum(Collection items)
Sums all the items from a collection of items.
Parameters:
items - a collection of items
Returns:
the sum of the items

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

 

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