org.apache.shiro.util

Class CollectionUtils

java.lang.Object

org.apache.shiro.util.CollectionUtils

public class CollectionUtils
extends Object

Static helper class for use dealing with Collections.

Since:

0.9

Constructor Summary

Constructors

Constructor and Description
CollectionUtils()

Method Summary

Modifier and Type	Method and Description
static <E> List<E>	asList(E... elements)
static <E> Set<E>	asSet(E... elements)
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 boolean	isEmpty(PrincipalCollection principals) Returns true if the specified PrincipalCollection 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

Constructor Detail

CollectionUtils

public CollectionUtils()

Method Detail

asSet

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

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.

Since:

1.0

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.

Since:

1.0

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.

Since:

1.2

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.

Since:

1.2

isEmpty

public static boolean isEmpty(PrincipalCollection principals)

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

Parameters:

principals - the principals to check.

Returns:

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

Since:

1.0

asList

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