Package it.unimi.dsi.fastutil.objects

Class ReferenceImmutableList<K>

java.lang.Object

java.util.AbstractCollection<K>

it.unimi.dsi.fastutil.objects.AbstractReferenceCollection<K>

it.unimi.dsi.fastutil.objects.AbstractReferenceList<K>

it.unimi.dsi.fastutil.objects.ReferenceImmutableList<K>

All Implemented Interfaces:

ObjectIterable<K>, ReferenceCollection<K>, ReferenceList<K>, Stack<K>, Serializable, Cloneable, Iterable<K>, Collection<K>, List<K>, RandomAccess

public class ReferenceImmutableList<K>
extends AbstractReferenceList<K>
implements ReferenceList<K>, RandomAccess, Cloneable, 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

Nested Class Summary

Nested classes/interfaces inherited from class it.unimi.dsi.fastutil.objects.AbstractReferenceList

AbstractReferenceList.ReferenceRandomAccessSubList<K>, AbstractReferenceList.ReferenceSubList<K>

Constructor Summary

Constructors

Constructor	Description
ReferenceImmutableList(ObjectIterator<? extends K> i)	Creates a new immutable list and fills it with the elements returned by a type-specific iterator..
ReferenceImmutableList(ReferenceCollection<? extends K> c)	Creates a new immutable list and fills it with a given type-specific collection.
ReferenceImmutableList(ReferenceList<? extends K> l)	Creates a new immutable list and fills it with a given type-specific list.
ReferenceImmutableList(Collection<? extends K> c)	Creates a new immutable list and fills it with a given collection.
ReferenceImmutableList(K[] a)	Creates a new immutable list using a given array.
ReferenceImmutableList(K[] a, int offset, int length)	Creates a new immutable list and fills it with the elements of a given array.

Method Summary

Modifier and Type	Method	Description
final void	add(int index, K k)	Deprecated.
final boolean	add(K k)	Deprecated.
final boolean	addAll(int index, Collection<? extends K> c)	Deprecated.
final boolean	addAll(Collection<? extends K> c)	Deprecated.
final void	addElements(int index, K[] a, int offset, int length)	Deprecated.
final void	clear()	Deprecated.
ReferenceImmutableList<K>	clone()
boolean	equals(ReferenceImmutableList<K> l)	Compares this type-specific immutable list to another one.
boolean	equals(Object o)
void	forEach(Consumer<? super K> action)
K	get(int index)
void	getElements(int from, Object[] a, int offset, int length)	Copies element of this type-specific list into the given array using optimized system calls.
int	indexOf(Object k)
boolean	isEmpty()	Checks whether the stack is empty.
int	lastIndexOf(Object k)
ObjectListIterator<K>	listIterator(int index)	Returns a type-specific list iterator on the list starting at a given index.
static <K> ReferenceImmutableList<K>	of()	Returns an empty immutable list.
static <K> ReferenceImmutableList<K>	of(K... init)	Creates an immutable list using a list of elements.
final K	remove(int index)	Deprecated.
final boolean	remove(Object k)	Deprecated.
final boolean	removeAll(Collection<?> c)	Deprecated.
final void	removeElements(int from, int to)	Deprecated.
final boolean	removeIf(Predicate<? super K> c)	Deprecated.
final void	replaceAll(UnaryOperator<K> operator)	Deprecated.
final boolean	retainAll(Collection<?> c)	Deprecated.
final K	set(int index, K k)	Deprecated.
final void	setElements(int index, K[] a, int offset, int length)	Deprecated.
int	size()
final void	size(int size)	Deprecated.
final void	sort(Comparator<? super K> comparator)	Deprecated.
ObjectSpliterator<K>	spliterator()	Returns a type-specific spliterator on the elements of this list.
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.
Object[]	toArray()
<K> K[]	toArray(K[] a)
static <K> Collector<K,?,ReferenceImmutableList<K>>	toList()	Returns a Collector that collects a Stream's elements into a new ImmutableList.
static <K> 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.
final void	unstableSort(Comparator<? super K> comparator)	Deprecated.

Methods inherited from class it.unimi.dsi.fastutil.objects.AbstractReferenceList

addElements, contains, hashCode, iterator, listIterator, peek, pop, push, top, toString

Methods inherited from class java.util.AbstractCollection

containsAll

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Collection

parallelStream, removeIf, stream, toArray

Methods inherited from interface java.util.List

add, add, addAll, addAll, clear, contains, containsAll, hashCode, remove, remove, removeAll, replaceAll, retainAll, set

Methods inherited from interface it.unimi.dsi.fastutil.objects.ReferenceList

addAll, addAll, addElements, addElements, iterator, listIterator, removeElements, setElements, setElements, setElements, size, sort, unstableSort

Constructor Details

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(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 Details

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>
Collector<K,?,ReferenceImmutableList<K>> toList()

Returns a Collector that collects a Stream's elements into a new ImmutableList.

toListWithExpectedSize

public static <K>
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 List<K>

indexOf

public int indexOf(Object k)

Specified by:

indexOf in interface List<K>

Overrides:

indexOf in class AbstractReferenceList<K>

lastIndexOf

public int lastIndexOf(Object k)

Specified by:

lastIndexOf in interface List<K>

Overrides:

lastIndexOf in class AbstractReferenceList<K>

size

public int size()

Specified by:

size in interface Collection<K>

Specified by:

size in interface List<K>

Specified by:

size in class AbstractCollection<K>

isEmpty

public boolean isEmpty()

Description copied from interface: Stack

Checks whether the stack is empty.

Specified by:

isEmpty in interface Collection<K>

Specified by:

isEmpty in interface List<K>

Specified by:

isEmpty in interface Stack<K>

Overrides:

isEmpty in class AbstractCollection<K>

Returns:

true if the stack is empty.

getElements

public void getElements(int from,
 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.

forEach

public void forEach(Consumer<? super K> action)

Description copied from class: AbstractReferenceList

Specified by:

forEach in interface Iterable<K>

Overrides:

forEach in class AbstractReferenceList<K>

toArray

public Object[] toArray()

Specified by:

toArray in interface Collection<K>

Specified by:

toArray in interface List<K>

Overrides:

toArray in class AbstractReferenceList<K>

toArray

public <K> K[] toArray(K[] a)

Specified by:

toArray in interface Collection<K>

Specified by:

toArray in interface List<K>

Overrides:

toArray in class AbstractReferenceList<K>

listIterator

public ObjectListIterator<K> listIterator(int index)

Description copied from class: AbstractReferenceList

Returns a type-specific list iterator on the list starting at a given index.

Specified by:

listIterator in interface List<K>

Specified by:

listIterator in interface ReferenceList<K>

Overrides:

listIterator in class AbstractReferenceList<K>

See Also:

• List.listIterator(int)

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 Collection<K>

Specified by:

spliterator in interface Iterable<K>

Specified by:

spliterator in interface 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 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).

clone

public ReferenceImmutableList<K> clone()

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(Object o)

Specified by:

equals in interface Collection<K>

Specified by:

equals in interface 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 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 Collection<K>

Specified by:

add in interface 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(Collection<? extends K> c)

Deprecated.

Description copied from class: AbstractReferenceList

Specified by:

addAll in interface Collection<K>

Specified by:

addAll in interface 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,
 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 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 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(Object k)

Deprecated.

Specified by:

remove in interface Collection<K>

Specified by:

remove in interface List<K>

Overrides:

remove in class AbstractCollection<K>

Implementation Specification:

Always throws UnsupportedOperationException as this is an immutable type.

removeAll

@Deprecated
public final boolean removeAll(Collection<?> c)

Deprecated.

Specified by:

removeAll in interface Collection<K>

Specified by:

removeAll in interface List<K>

Overrides:

removeAll in class AbstractCollection<K>

Implementation Specification:

Always throws UnsupportedOperationException as this is an immutable type.

retainAll

@Deprecated
public final boolean retainAll(Collection<?> c)

Deprecated.

Specified by:

retainAll in interface Collection<K>

Specified by:

retainAll in interface List<K>

Overrides:

retainAll in class AbstractCollection<K>

Implementation Specification:

Always throws UnsupportedOperationException as this is an immutable type.

removeIf

@Deprecated
public final boolean removeIf(Predicate<? super K> c)

Deprecated.

Specified by:

removeIf in interface Collection<K>

Implementation Specification:

Always throws UnsupportedOperationException as this is an immutable type.

replaceAll

@Deprecated
public final void replaceAll(UnaryOperator<K> operator)

Deprecated.

Specified by:

replaceAll in interface 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 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 Collection<K>

Specified by:

clear in interface 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(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 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(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.