Package it.unimi.dsi.fastutil.objects

Class AbstractReferenceList<K>

java.lang.Object

java.util.AbstractCollection<K>

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

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

All Implemented Interfaces:

ObjectIterable<K>, ReferenceCollection<K>, ReferenceList<K>, Stack<K>, Iterable<K>, Collection<K>, List<K>, SequencedCollection<K>

Direct Known Subclasses:

AbstractReferenceList.ReferenceSubList, ReferenceArrayList, ReferenceImmutableList, ReferenceLists.Singleton

public abstract class AbstractReferenceList<K>
extends AbstractReferenceCollection<K>
implements ReferenceList<K>, Stack<K>

An abstract class providing basic methods for lists implementing a type-specific list interface.

As an additional bonus, this class implements on top of the list operations a type-specific stack.

Most of the methods in this class are optimized with the assumption that the List will have have constant-time random access. If this is not the case, you should probably at least override listIterator(int) and the xAll() methods (such as addAll(int, java.util.Collection<? extends K>)) with a more appropriate iteration scheme. Note the subList(int, int) method is cognizant of random-access or not, so that need not be reimplemented.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	AbstractReferenceList.ReferenceRandomAccessSubList<K>
static class	AbstractReferenceList.ReferenceSubList<K>	A class implementing a sublist view.

Method Summary

Modifier and Type	Method	Description
void	add(int index, K k)
boolean	add(K k)
boolean	addAll(int index, Collection<? extends K> c)	Adds all of the elements in the specified collection to this list (optional operation).
boolean	addAll(Collection<? extends K> c)
void	addElements(int index, K[] a)	Add (hopefully quickly) elements to this type-specific list.
void	addElements(int index, K[] a, int offset, int length)	Add (hopefully quickly) elements to this type-specific list.
void	clear()
boolean	contains(Object k)	Returns true if this list contains the specified element.
boolean	equals(Object o)
void	forEach(Consumer<? super K> action)
void	getElements(int from, Object[] a, int offset, int length)	Copies (hopefully quickly) elements of this type-specific list into the given array.
int	hashCode()	Returns the hash code for this list, which is identical to List.hashCode().
int	indexOf(Object k)
ObjectListIterator<K>	iterator()	Returns a type-specific iterator on the elements of this collection.
int	lastIndexOf(Object k)
ObjectListIterator<K>	listIterator()	Returns a type-specific list iterator on the list.
ObjectListIterator<K>	listIterator(int index)	Returns a type-specific list iterator on the list starting at a given index.
K	peek(int i)	Peeks at an element on the stack (optional operation).
K	pop()	Pops the top off the stack.
void	push(K o)	Pushes the given object on the stack.
K	remove(int i)
void	removeElements(int from, int to)	Removes (hopefully quickly) elements of this type-specific list.
K	set(int index, K k)
void	setElements(int index, K[] a, int offset, int length)	Set (hopefully quickly) elements to match the array given.
void	size(int size)	Sets the size 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()
<T> T[]	toArray(T[] a)
K	top()	Peeks at the top of the stack (optional operation).
String	toString()

Methods inherited from class java.util.AbstractCollection

containsAll, isEmpty, remove, removeAll, retainAll, size

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

addFirst, addLast, containsAll, get, getFirst, getLast, isEmpty, remove, removeAll, removeFirst, removeLast, replaceAll, retainAll, reversed, size

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

spliterator

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

addAll, addAll, setElements, setElements, sort, spliterator, unstableSort

Methods inherited from interface it.unimi.dsi.fastutil.Stack

isEmpty

Method Details

add

public void add(int index,
 K k)

Specified by:

add in interface List<K>

Implementation Specification:

This implementation always throws an UnsupportedOperationException.

add

public boolean add(K k)

Specified by:

add in interface Collection<K>

Specified by:

add in interface List<K>

Overrides:

add in class AbstractCollection<K>

Implementation Specification:

This implementation delegates to the type-specific version of List.add(int, Object).

remove

public K remove(int i)

Specified by:

remove in interface List<K>

Implementation Specification:

This implementation always throws an UnsupportedOperationException.

set

public K set(int index,
 K k)

Specified by:

set in interface List<K>

Implementation Specification:

This implementation always throws an UnsupportedOperationException.

addAll

public boolean addAll(int index,
 Collection<? extends K> c)

Adds all of the elements in the specified collection to this list (optional operation).

Specified by:

addAll in interface List<K>

addAll

public boolean addAll(Collection<? extends K> c)

Specified by:

addAll in interface Collection<K>

Specified by:

addAll in interface List<K>

Overrides:

addAll in class AbstractCollection<K>

Implementation Specification:

This implementation delegates to the type-specific version of List.addAll(int, Collection).

iterator

public ObjectListIterator<K> iterator()

Returns a type-specific iterator on the elements of this collection.

Specified by:

iterator in interface Collection<K>

Specified by:

iterator in interface Iterable<K>

Specified by:

iterator in interface List<K>

Specified by:

iterator in interface ObjectIterable<K>

Specified by:

iterator in interface ReferenceCollection<K>

Specified by:

iterator in interface ReferenceList<K>

Specified by:

iterator in class AbstractReferenceCollection<K>

Returns:

a type-specific iterator on the elements of this collection.

See Also:

• Iterable.iterator()

Implementation Specification:

This implementation delegates to listIterator().

listIterator

public ObjectListIterator<K> listIterator()

Returns a type-specific list iterator on the list.

Specified by:

listIterator in interface List<K>

Specified by:

listIterator in interface ReferenceList<K>

See Also:

• List.listIterator()

Implementation Specification:

This implementation delegates to listIterator(0).

listIterator

public ObjectListIterator<K> listIterator(int index)

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>

See Also:

• List.listIterator(int)

Implementation Specification:

This implementation is based on the random-access methods.

contains

public boolean contains(Object k)

Returns true if this list contains the specified element.

Specified by:

contains in interface Collection<K>

Specified by:

contains in interface List<K>

Overrides:

contains in class AbstractCollection<K>

See Also:

• List.contains(Object)

Implementation Specification:

This implementation delegates to indexOf().

indexOf

public int indexOf(Object k)

Specified by:

indexOf in interface List<K>

lastIndexOf

public int lastIndexOf(Object k)

Specified by:

lastIndexOf in interface List<K>

size

public void size(int size)

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>

Parameters:

size - the new size.

subList

public ReferenceList<K> subList(int from,
 int to)

Description copied from interface: ReferenceList

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>

See Also:

• List.subList(int,int)

forEach

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

Specified by:

forEach in interface Iterable<K>

Implementation Specification:

If this list is RandomAccess, will iterate using a for loop and the type-specific List.get(int) method. Otherwise it will fallback to using the iterator based loop implementation from the superinterface.

removeElements

public void removeElements(int from,
 int to)

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>

Parameters:

from - the start index (inclusive).

to - the end index (exclusive).

addElements

public void addElements(int index,
 K[] a,
 int offset,
 int length)

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>

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.

addElements

public void addElements(int index,
 K[] a)

Add (hopefully quickly) elements to this type-specific list.

Specified by:

addElements in interface ReferenceList<K>

Parameters:

index - the index at which to add elements.

a - the array containing the elements.

Implementation Specification:

This implementation delegates to the analogous method for array fragments.

getElements

public void getElements(int from,
 Object[] a,
 int offset,
 int length)

Copies (hopefully quickly) elements of this type-specific list into the given array.

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

Specified by:

getElements in interface ReferenceList<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.

setElements

public void setElements(int index,
 K[] a,
 int offset,
 int length)

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>

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.

clear

public void clear()

Specified by:

clear in interface Collection<K>

Specified by:

clear in interface List<K>

Overrides:

clear in class AbstractCollection<K>

Implementation Specification:

This implementation delegates to removeElements(int, int).

toArray

public Object[] toArray()

Specified by:

toArray in interface Collection<K>

Specified by:

toArray in interface List<K>

Overrides:

toArray in class AbstractCollection<K>

toArray

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

Specified by:

toArray in interface Collection<K>

Specified by:

toArray in interface List<K>

Overrides:

toArray in class AbstractCollection<K>

hashCode

public int hashCode()

Returns the hash code for this list, which is identical to List.hashCode().

Specified by:

hashCode in interface Collection<K>

Specified by:

hashCode in interface List<K>

Overrides:

hashCode in class Object

Returns:

the hash code for this list.

equals

public boolean equals(Object o)

Specified by:

equals in interface Collection<K>

Specified by:

equals in interface List<K>

Overrides:

equals in class Object

push

public void push(K o)

Description copied from interface: Stack

Pushes the given object on the stack.

Specified by:

push in interface Stack<K>

Parameters:

o - the object that will become the new top of the stack.

pop

public K pop()

Description copied from interface: Stack

Pops the top off the stack.

Specified by:

pop in interface Stack<K>

Returns:

the top of the stack.

top

public K top()

Description copied from interface: Stack

Peeks at the top of the stack (optional operation).

This default implementation returns peek(0).

Specified by:

top in interface Stack<K>

Returns:

the top of the stack.

peek

public K peek(int i)

Description copied from interface: Stack

Peeks at an element on the stack (optional operation).

This default implementation just throws an UnsupportedOperationException.

Specified by:

peek in interface Stack<K>

Parameters:

i - an index from the stop of the stack (0 represents the top).

Returns:

the i-th element on the stack.

toString

public String toString()

Overrides:

toString in class AbstractReferenceCollection<K>