Class UnmodifiableCollectionUtil


  • public final class UnmodifiableCollectionUtil
    extends Object
    Note: it simply wraps the existing JDK methods to provide a workaround for Pitest survival on mutation for removal of immutable wrapping, see #13127 for more details.
    • Method Detail

      • unmodifiableList

        public static <T> List<T> unmodifiableList​(List<T> collection)
        Creates an unmodifiable list based on the provided collection.
        Type Parameters:
        T - the type of elements in the set
        Parameters:
        collection - the collection to create an unmodifiable list from
        Returns:
        an unmodifiable list containing the elements from the provided collection
      • unmodifiableList

        public static <S,​T> List<T> unmodifiableList​(Collection<S> items,
                                                           Class<T> elementType)
        Returns an unmodifiable view of a List containing elements of a specific type.
        Type Parameters:
        S - The generic type of elements in the input Collection.
        T - The type of elements in the resulting unmodifiable List.
        Parameters:
        items - The List of items to make unmodifiable.
        elementType - The Class object representing the type of elements in the list.
        Returns:
        An unmodifiable List containing elements of the specified type.
      • copyOfArray

        public static <T> T[] copyOfArray​(T[] array,
                                          int length)
        Creates a copy of array.
        Type Parameters:
        T - The type of array
        Parameters:
        array - Array to create a copy of
        length - length of array
        Returns:
        copy of array
      • copyOfMap

        public static <K,​V> Map<K,​V> copyOfMap​(Map<? extends K,​? extends V> map)
        Creates a copy of Map.
        Type Parameters:
        K - the type of keys in the map
        V - the type of values in the map
        Parameters:
        map - map to create a copy of
        Returns:
        an immutable copy of the input map
      • singleton

        public static <T> Set<T> singleton​(T obj)
        Returns an immutable set containing only the specified object.
        Type Parameters:
        T - the type of object
        Parameters:
        obj - the type of object in the set
        Returns:
        immutable set