Package it.unimi.dsi.fastutil.objects

Class ReferenceImmutableList<K>

  • All Implemented Interfaces:
    ObjectIterable<K>, ReferenceCollection<K>, ReferenceList<K>, Stack<K>, java.io.Serializable, java.lang.Cloneable, java.lang.Iterable<K>, java.util.Collection<K>, java.util.List<K>, java.util.RandomAccess
    public class ReferenceImmutableList<K>
extends AbstractReferenceList<K>
implements ReferenceList<K>, java.util.RandomAccess, java.lang.Cloneable, java.io.Serializable
    A type-specific array-based immutable list; provides some additional methods that use polymorphism to avoid (un)boxing.

    Instances of this class are immutable and (contrarily to mutable array-based list implementations) the backing array is not exposed. Instances can be built using a variety of methods, but note that constructors using an array will not make a defensive copy.

    This class implements the bulk method getElements() using high-performance system calls (e.g., System.arraycopy()) instead of expensive loops.

    See Also:
    Serialized Form

    • Constructor Detail

      • ReferenceImmutableList

        public ReferenceImmutableList​(K[] a)
        Creates a new immutable list using a given array.

        Note that this constructor does not perform a defensive copy.

        Parameters:
        a - the array that will be used to back this immutable list.

      • ReferenceImmutableList

        public ReferenceImmutableList​(java.util.Collection<? extends K> c)
        Creates a new immutable list and fills it with a given collection.
        Parameters:
        c - a collection that will be used to fill the immutable list.

      • ReferenceImmutableList

        public ReferenceImmutableList​(ReferenceCollection<? extends K> c)
        Creates a new immutable list and fills it with a given type-specific collection.
        Parameters:
        c - a type-specific collection that will be used to fill the immutable list.

      • ReferenceImmutableList

        public ReferenceImmutableList​(ReferenceList<? extends K> l)
        Creates a new immutable list and fills it with a given type-specific list.
        Parameters:
        l - a type-specific list that will be used to fill the immutable list.

      • ReferenceImmutableList

        public ReferenceImmutableList​(K[] a,
                              int offset,
                              int length)
        Creates a new immutable list and fills it with the elements of a given array.
        Parameters:
        a - an array whose elements will be used to fill the immutable list.
        offset - the first element to use.
        length - the number of elements to use.

      • ReferenceImmutableList

        public ReferenceImmutableList​(ObjectIterator<? extends K> i)
        Creates a new immutable list and fills it with the elements returned by a type-specific iterator..
        Parameters:
        i - a type-specific iterator whose returned elements will fill the immutable list.

    • Method Detail

      • of

        public static <K> ReferenceImmutableList<K> of()
        Returns an empty immutable list.
        Returns:
        an immutable list (possibly shared) that is empty.

      • of

        @SafeVarargs
public static <K> ReferenceImmutableList<K> of​(K... init)
        Creates an immutable list using a list of elements.

        Note that this method does not perform a defensive copy.

        Parameters:
        init - a list of elements that will be used to initialize the list.
        Returns:
        a new immutable list containing the given elements.

      • toList

        public static <K> java.util.stream.Collector<K,​?,​ReferenceImmutableList<K>> toList()
        Returns a Collector that collects a Stream's elements into a new ImmutableList.

      • toListWithExpectedSize

        public static <K> java.util.stream.Collector<K,​?,​ReferenceImmutableList<K>> toListWithExpectedSize​(int expectedSize)
        Returns a Collector that collects a Stream's elements into a new ImmutableList, potentially pre-allocated to handle the given size.

      • get

        public K get​(int index)
        Specified by:
        get in interface java.util.List<K>

      • indexOf

        public int indexOf​(java.lang.Object k)
        Specified by:
        indexOf in interface java.util.List<K>
        Overrides:
        indexOf in class AbstractReferenceList<K>

      • lastIndexOf

        public int lastIndexOf​(java.lang.Object k)
        Specified by:
        lastIndexOf in interface java.util.List<K>
        Overrides:
        lastIndexOf in class AbstractReferenceList<K>

      • size

        public int size()
        Specified by:
        size in interface java.util.Collection<K>
        Specified by:
        size in interface java.util.List<K>
        Specified by:
        size in class java.util.AbstractCollection<K>

      • isEmpty

        public boolean isEmpty()
        Description copied from interface: Stack
        Checks whether the stack is empty.
        Specified by:
        isEmpty in interface java.util.Collection<K>
        Specified by:
        isEmpty in interface java.util.List<K>
        Specified by:
        isEmpty in interface Stack<K>
        Overrides:
        isEmpty in class java.util.AbstractCollection<K>
        Returns:
        true if the stack is empty.

      • getElements

        public void getElements​(int from,
                        java.lang.Object[] a,
                        int offset,
                        int length)
        Copies element of this type-specific list into the given array using optimized system calls.
        Specified by:
        getElements in interface ReferenceList<K>
        Overrides:
        getElements in class AbstractReferenceList<K>
        Parameters:
        from - the start index (inclusive).
        a - the destination array.
        offset - the offset into the destination array where to store the first element copied.
        length - the number of elements to be copied.

      • toArray

        public java.lang.Object[] toArray()
        Specified by:
        toArray in interface java.util.Collection<K>
        Specified by:
        toArray in interface java.util.List<K>
        Overrides:
        toArray in class AbstractReferenceList<K>

      • toArray

        public <K> K[] toArray​(K[] a)
        Specified by:
        toArray in interface java.util.Collection<K>
        Specified by:
        toArray in interface java.util.List<K>
        Overrides:
        toArray in class AbstractReferenceList<K>

      • spliterator

        public ObjectSpliterator<K> spliterator()
        Description copied from interface: ReferenceList
        Returns a type-specific spliterator on the elements of this list.

        List spliterators must report at least Spliterator.SIZED and Spliterator.ORDERED.

        See List.spliterator() for more documentation on the requirements of the returned spliterator.

        Specified by:
        spliterator in interface java.util.Collection<K>
        Specified by:
        spliterator in interface java.lang.Iterable<K>
        Specified by:
        spliterator in interface java.util.List<K>
        Specified by:
        spliterator in interface ObjectIterable<K>
        Specified by:
        spliterator in interface ReferenceCollection<K>
        Specified by:
        spliterator in interface ReferenceList<K>
        Returns:
        a type-specific spliterator on the elements of this collection.

      • subList

        public ReferenceList<K> subList​(int from,
                                int to)
        Returns a type-specific view of the portion of this list from the index from, inclusive, to the index to, exclusive.
        Specified by:
        subList in interface java.util.List<K>
        Specified by:
        subList in interface ReferenceList<K>
        Overrides:
        subList in class AbstractReferenceList<K>
        See Also:
        List.subList(int,int)
        API Notes:
        The returned list will be immutable, but is currently not declared to return an instance of ImmutableList due to complications of implementation details. This may change in a future version (in other words, do not consider the return type of this method to be stable if making a subclass of ImmutableList).

      • equals

        public boolean equals​(ReferenceImmutableList<K> l)
        Compares this type-specific immutable list to another one.
        Parameters:
        l - a type-specific immutable list.
        Returns:
        true if the argument contains the same elements of this type-specific immutable list.
        API Notes:
        This method exists only for sake of efficiency. The implementation inherited from the abstract implementation would already work.

      • equals

        public boolean equals​(java.lang.Object o)
        Specified by:
        equals in interface java.util.Collection<K>
        Specified by:
        equals in interface java.util.List<K>
        Overrides:
        equals in class AbstractReferenceList<K>

      • add

        @Deprecated
public final void add​(int index,
                      K k)
        Deprecated.
        Description copied from class: AbstractReferenceList
        Specified by:
        add in interface java.util.List<K>
        Overrides:
        add in class AbstractReferenceList<K>
        Implementation Specification:
        Always throws UnsupportedOperationException as this is an immutable type.

      • add

        @Deprecated
public final boolean add​(K k)
        Deprecated.
        Description copied from class: AbstractReferenceList
        Specified by:
        add in interface java.util.Collection<K>
        Specified by:
        add in interface java.util.List<K>
        Overrides:
        add in class AbstractReferenceList<K>
        Implementation Specification:
        Always throws UnsupportedOperationException as this is an immutable type.

      • addAll

        @Deprecated
public final boolean addAll​(java.util.Collection<? extends K> c)
        Deprecated.
        Description copied from class: AbstractReferenceList
        Specified by:
        addAll in interface java.util.Collection<K>
        Specified by:
        addAll in interface java.util.List<K>
        Overrides:
        addAll in class AbstractReferenceList<K>
        Implementation Specification:
        Always throws UnsupportedOperationException as this is an immutable type.

      • addAll

        @Deprecated
public final boolean addAll​(int index,
                            java.util.Collection<? extends K> c)
        Deprecated.
        Description copied from class: AbstractReferenceList
        Adds all of the elements in the specified collection to this list (optional operation).
        Specified by:
        addAll in interface java.util.List<K>
        Overrides:
        addAll in class AbstractReferenceList<K>
        Implementation Specification:
        Always throws UnsupportedOperationException as this is an immutable type.

      • remove

        @Deprecated
public final K remove​(int index)
        Deprecated.
        Description copied from class: AbstractReferenceList
        Specified by:
        remove in interface java.util.List<K>
        Overrides:
        remove in class AbstractReferenceList<K>
        Implementation Specification:
        Always throws UnsupportedOperationException as this is an immutable type.

      • remove

        @Deprecated
public final boolean remove​(java.lang.Object k)
        Deprecated.
        Specified by:
        remove in interface java.util.Collection<K>
        Specified by:
        remove in interface java.util.List<K>
        Overrides:
        remove in class java.util.AbstractCollection<K>
        Implementation Specification:
        Always throws UnsupportedOperationException as this is an immutable type.

      • removeAll

        @Deprecated
public final boolean removeAll​(java.util.Collection<?> c)
        Deprecated.
        Specified by:
        removeAll in interface java.util.Collection<K>
        Specified by:
        removeAll in interface java.util.List<K>
        Overrides:
        removeAll in class java.util.AbstractCollection<K>
        Implementation Specification:
        Always throws UnsupportedOperationException as this is an immutable type.

      • retainAll

        @Deprecated
public final boolean retainAll​(java.util.Collection<?> c)
        Deprecated.
        Specified by:
        retainAll in interface java.util.Collection<K>
        Specified by:
        retainAll in interface java.util.List<K>
        Overrides:
        retainAll in class java.util.AbstractCollection<K>
        Implementation Specification:
        Always throws UnsupportedOperationException as this is an immutable type.

      • removeIf

        @Deprecated
public final boolean removeIf​(java.util.function.Predicate<? super K> c)
        Deprecated.
        Specified by:
        removeIf in interface java.util.Collection<K>
        Implementation Specification:
        Always throws UnsupportedOperationException as this is an immutable type.

      • replaceAll

        @Deprecated
public final void replaceAll​(java.util.function.UnaryOperator<K> operator)
        Deprecated.
        Specified by:
        replaceAll in interface java.util.List<K>
        Implementation Specification:
        Always throws UnsupportedOperationException as this is an immutable type.

      • set

        @Deprecated
public final K set​(int index,
                   K k)
        Deprecated.
        Description copied from class: AbstractReferenceList
        Specified by:
        set in interface java.util.List<K>
        Overrides:
        set in class AbstractReferenceList<K>
        Implementation Specification:
        Always throws UnsupportedOperationException as this is an immutable type.

      • clear

        @Deprecated
public final void clear()
        Deprecated.
        Description copied from class: AbstractReferenceList
        Specified by:
        clear in interface java.util.Collection<K>
        Specified by:
        clear in interface java.util.List<K>
        Overrides:
        clear in class AbstractReferenceList<K>
        Implementation Specification:
        Always throws UnsupportedOperationException as this is an immutable type.

      • size

        @Deprecated
public final void size​(int size)
        Deprecated.
        Description copied from interface: ReferenceList
        Sets the size of this list.

        If the specified size is smaller than the current size, the last elements are discarded. Otherwise, they are filled with 0/null/false.

        Specified by:
        size in interface ReferenceList<K>
        Overrides:
        size in class AbstractReferenceList<K>
        Parameters:
        size - the new size.
        Implementation Specification:
        Always throws UnsupportedOperationException as this is an immutable type.

      • removeElements

        @Deprecated
public final void removeElements​(int from,
                                 int to)
        Deprecated.
        Description copied from class: AbstractReferenceList
        Removes (hopefully quickly) elements of this type-specific list.

        This is a trivial iterator-based based implementation. It is expected that implementations will override this method with a more optimized version.

        Specified by:
        removeElements in interface ReferenceList<K>
        Overrides:
        removeElements in class AbstractReferenceList<K>
        Parameters:
        from - the start index (inclusive).
        to - the end index (exclusive).
        Implementation Specification:
        Always throws UnsupportedOperationException as this is an immutable type.

      • addElements

        @Deprecated
public final void addElements​(int index,
                              K[] a,
                              int offset,
                              int length)
        Deprecated.
        Description copied from class: AbstractReferenceList
        Add (hopefully quickly) elements to this type-specific list.

        This is a trivial iterator-based implementation. It is expected that implementations will override this method with a more optimized version.

        Specified by:
        addElements in interface ReferenceList<K>
        Overrides:
        addElements in class AbstractReferenceList<K>
        Parameters:
        index - the index at which to add elements.
        a - the array containing the elements.
        offset - the offset of the first element to add.
        length - the number of elements to add.
        Implementation Specification:
        Always throws UnsupportedOperationException as this is an immutable type.

      • setElements

        @Deprecated
public final void setElements​(int index,
                              K[] a,
                              int offset,
                              int length)
        Deprecated.
        Description copied from interface: ReferenceList
        Set (hopefully quickly) elements to match the array given. Sets each in this list to the corresponding elements in the array, as if by 
        
 ListIterator iter = listIterator(index);
 int i = 0;
 while (i < length) {
   iter.next();
   iter.set(a[offset + i++]);
 }
        However, the exact implementation may be more efficient, taking into account whether random access is faster or not, or at the discretion of subclasses, abuse internals.
        Specified by:
        setElements in interface ReferenceList<K>
        Overrides:
        setElements in class AbstractReferenceList<K>
        Parameters:
        index - the index at which to start setting elements.
        a - the array containing the elements
        offset - the offset of the first element to add.
        length - the number of elements to add.
        Implementation Specification:
        Always throws UnsupportedOperationException as this is an immutable type.

      • sort

        @Deprecated
public final void sort​(java.util.Comparator<? super K> comparator)
        Deprecated.
        Description copied from interface: ReferenceList
        Sorts this list using a sort assured to be stable.

        Pass null to sort using natural ordering.

        Unless a subclass specifies otherwise, the results of the method if the list is concurrently modified during the sort are unspecified.

        Specified by:
        sort in interface java.util.List<K>
        Specified by:
        sort in interface ReferenceList<K>
        Implementation Specification:
        Always throws UnsupportedOperationException as this is an immutable type.

      • unstableSort

        @Deprecated
public final void unstableSort​(java.util.Comparator<? super K> comparator)
        Deprecated.
        Description copied from interface: ReferenceList
        Sorts this list using a sort not assured to be stable. This differs from List.sort(java.util.Comparator) in that the results are not assured to be stable, but may be a bit faster.

        Pass null to sort using natural ordering.

        Unless a subclass specifies otherwise, the results of the method if the list is concurrently modified during the sort are unspecified.

        Specified by:
        unstableSort in interface ReferenceList<K>
        Implementation Specification:
        Always throws UnsupportedOperationException as this is an immutable type.