Package groovy.util
Class GroovyCollections
- java.lang.Object
-
- groovy.util.GroovyCollections
-
public class GroovyCollections extends java.lang.Object
A Collections utility class- Author:
- Paul King, Jim White
-
-
Constructor Summary
Constructors Constructor Description GroovyCollections()
-
Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method Description static java.util.List
combinations(java.lang.Object[] collections)
Finds all combinations of items from the given collections.static java.util.List
combinations(java.util.Collection collections)
Finds all combinations of items from the given collections.static <T> T
max(java.util.Collection<T> items)
Selects the maximum value found in a collectionstatic <T> T
max(T[] items)
Selects the maximum value found in an array of items, so min([2, 4, 6] as Object[]) == 6.static <T> T
min(java.util.Collection<T> items)
Selects the minimum value found in a collection of items.static <T> T
min(T[] items)
Selects the minimum value found in an array of items, so min([2, 4, 6] as Object[]) == 2.static <T> java.util.Set<java.util.List<T>>
subsequences(java.util.List<T> items)
Finds all non-null subsequences of a list.static java.lang.Object
sum(java.lang.Object[] items)
Sums all the items from an array of items.static java.lang.Object
sum(java.util.Collection items)
Sums all the items from a collection of items.static java.util.List
transpose(java.lang.Object[] lists)
Transposes an array of lists.static java.util.List
transpose(java.util.List lists)
Transposes the given lists.
-
-
-
Method Detail
-
combinations
public static java.util.List combinations(java.lang.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> java.util.Set<java.util.List<T>> subsequences(java.util.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
public static java.util.List combinations(java.util.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]]
andcombinations([['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
-
transpose
public static java.util.List transpose(java.lang.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 java.util.List transpose(java.util.List lists)
Transposes the given lists. So,transpose([['a', 'b'], [1, 2]])
is[['a', 1], ['b', 2]]
andtranspose([['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
public static <T> T min(java.util.Collection<T> items)
Selects the minimum value found in a collection of items.- Parameters:
items
- a Collection- Returns:
- the minimum value
-
max
public static <T> 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
-
max
public static <T> T max(java.util.Collection<T> items)
Selects the maximum value found in a collection- Parameters:
items
- a Collection- Returns:
- the maximum value
-
sum
public static java.lang.Object sum(java.lang.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 java.lang.Object sum(java.util.Collection items)
Sums all the items from a collection of items.- Parameters:
items
- a collection of items- Returns:
- the sum of the items
-
-