be.atbash.util

Class CollectionUtils

java.lang.Object

be.atbash.util.CollectionUtils

public final class CollectionUtils
extends Object

Static helper class for use dealing with Collections. Taken from Apache Shiro.

Method Summary

Modifier and Type	Method and Description
static <E> List<E>	asList(E... elements) Converts the vararg argument to to a List instance.
static <E> Set<E>	asSet(E... elements) Returns the items in the vararg as a Set but keeping there order by using a LinkedHashSet.
static boolean	isEmpty(Collection c) Returns true if the specified Collection is null or empty, false otherwise.
static boolean	isEmpty(Map m) Returns true if the specified Map is null or empty, false otherwise.
static int	size(Collection c) Returns the size of the specified collection or 0 if the collection is null.
static int	size(Map m) Returns the size of the specified map or 0 if the map is null.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

asSet

public static <E> Set<E> asSet(E... elements)

Returns the items in the vararg as a Set but keeping there order by using a LinkedHashSet. Items must be of the same type.

Type Parameters:

E - The type of the items and the resulting Set

Parameters:

elements - items to be placed in Set

Returns:

The items as a modifiable Set.

isEmpty

public static boolean isEmpty(Collection c)

Returns true if the specified Collection is null or empty, false otherwise.

Parameters:

c - the collection to check

Returns:

true if the specified Collection is null or empty, false otherwise.

isEmpty

public static boolean isEmpty(Map m)

Returns true if the specified Map is null or empty, false otherwise.

Parameters:

m - the Map to check

Returns:

true if the specified Map is null or empty, false otherwise.

size

public static int size(Collection c)

Returns the size of the specified collection or 0 if the collection is null.

Parameters:

c - the collection to check

Returns:

the size of the specified collection or 0 if the collection is null.

size

public static int size(Map m)

Returns the size of the specified map or 0 if the map is null.

Parameters:

m - the map to check

Returns:

the size of the specified map or 0 if the map is null.

asList

public static <E> List<E> asList(E... elements)

Converts the vararg argument to to a List instance. The list is a regular list but the initial size is computed to accomadate exactly the number of items specified by the argument.

Type Parameters:

E - The type of the List items.

Parameters:

elements - The elements for the list.

Returns:

The elements within a List instance.