org.apache.shiro.util

Class CollectionUtils


  • public class CollectionUtils
extends Object
    Static helper class for use dealing with Collections.
    Since:
    0.9

    • 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)