Class ReferenceSets


  • public final class ReferenceSets
    extends Object
    A class providing static methods and objects that do useful things with type-specific sets.
    See Also:
    Collections
    • Field Detail

      • EMPTY_SET

        public static final ReferenceSets.EmptySet EMPTY_SET
        An empty set (immutable). It is serializable and cloneable.
    • Method Detail

      • emptySet

        public static <K> ReferenceSet<K> emptySet()
        Returns an empty set (immutable). It is serializable and cloneable.

        This method provides a typesafe access to EMPTY_SET.

        Returns:
        an empty set (immutable).
      • singleton

        public static <K> ReferenceSet<K> singleton​(K element)
        Returns a type-specific immutable set containing only the specified element. The returned set is serializable and cloneable.
        Parameters:
        element - the only element of the returned set.
        Returns:
        a type-specific immutable set containing just element.
      • synchronize

        public static <K> ReferenceSet<K> synchronize​(ReferenceSet<K> s)
        Returns a synchronized type-specific set backed by the given type-specific set.
        Parameters:
        s - the set to be wrapped in a synchronized set.
        Returns:
        a synchronized view of the specified set.
        See Also:
        Collections.synchronizedSet(Set)
      • synchronize

        public static <K> ReferenceSet<K> synchronize​(ReferenceSet<K> s,
                                                      Object sync)
        Returns a synchronized type-specific set backed by the given type-specific set, using an assigned object to synchronize.
        Parameters:
        s - the set to be wrapped in a synchronized set.
        sync - an object that will be used to synchronize the access to the set.
        Returns:
        a synchronized view of the specified set.
        See Also:
        Collections.synchronizedSet(Set)
      • unmodifiable

        public static <K> ReferenceSet<K> unmodifiable​(ReferenceSet<K> s)
        Returns an unmodifiable type-specific set backed by the given type-specific set.
        Parameters:
        s - the set to be wrapped in an unmodifiable set.
        Returns:
        an unmodifiable view of the specified set.
        See Also:
        Collections.unmodifiableSet(Set)