Package it.unimi.dsi.fastutil.ints

Class AbstractIntList

java.lang.Object

java.util.AbstractCollection<Integer>

it.unimi.dsi.fastutil.ints.AbstractIntCollection

it.unimi.dsi.fastutil.ints.AbstractIntList

All Implemented Interfaces:

IntCollection, IntIterable, IntList, IntStack, Stack<Integer>, Comparable<List<? extends Integer>>, Iterable<Integer>, Collection<Integer>, List<Integer>

Direct Known Subclasses:

AbstractIntList.IntSubList, IntArrayList, IntImmutableList, IntLists.Singleton

public abstract class AbstractIntList
extends AbstractIntCollection
implements IntList, IntStack

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 java.lang.Integer>)) 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	AbstractIntList.IntRandomAccessSubList
static class	AbstractIntList.IntSubList	A class implementing a sublist view.

Method Summary

Modifier and Type	Method	Description
boolean	add(int k)	Ensures that this collection contains the specified element (optional operation).
void	add(int index, int k)	Inserts the specified element at the specified position in this list (optional operation).
boolean	addAll(int index, IntCollection c)	Inserts all of the elements in the specified type-specific collection into this type-specific list at the specified position (optional operation).
boolean	addAll(int index, Collection<? extends Integer> c)	Adds all of the elements in the specified collection to this list (optional operation).
boolean	addAll(IntCollection c)	Adds all elements of the given type-specific collection to this collection.
boolean	addAll(Collection<? extends Integer> c)
void	addElements(int index, int[] a)	Add (hopefully quickly) elements to this type-specific list.
void	addElements(int index, int[] a, int offset, int length)	Add (hopefully quickly) elements to this type-specific list.
void	clear()
int	compareTo(List<? extends Integer> l)	Compares this list to another object.
boolean	contains(int k)	Returns true if this list contains the specified element.
boolean	equals(Object o)
void	forEach(IntConsumer action)	Performs the given action for each element of this type-specific Iterable until all elements have been processed or the action throws an exception.
void	getElements(int from, int[] 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(int k)	Returns the index of the first occurrence of the specified element in this list, or -1 if this list does not contain the element.
IntListIterator	iterator()	Returns a type-specific iterator on the elements of this collection.
int	lastIndexOf(int k)	Returns the index of the last occurrence of the specified element in this list, or -1 if this list does not contain the element.
IntListIterator	listIterator()	Returns a type-specific list iterator on the list.
IntListIterator	listIterator(int index)	Returns a type-specific list iterator on the list starting at a given index.
int	peekInt(int i)	Peeks at an element on the stack (optional operation).
int	popInt()	Pops the top off the stack.
void	push(int o)	Pushes the given object on the stack.
boolean	rem(int k)	Removes a single instance of the specified element from this collection, if it is present (optional operation).
void	removeElements(int from, int to)	Removes (hopefully quickly) elements of this type-specific list.
int	removeInt(int i)	Removes the element at the specified position in this list (optional operation).
final void	replaceAll(IntUnaryOperator operator)	Replaces each element of this list with the result of applying the operator to that element.
int	set(int index, int k)	Replaces the element at the specified position in this list with the specified element (optional operation).
void	setElements(int index, int[] a, int offset, int length)	Set (hopefully quickly) elements to match the array given.
void	size(int size)	Sets the size of this list.
IntList	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.
int[]	toArray(int[] a)	Returns an array containing all of the elements in this collection; the runtime type of the returned array is that of the specified array.
int[]	toIntArray()	Returns a primitive type array containing the items of this collection.
int	topInt()	Peeks at the top of the stack (optional operation).
String	toString()

Methods inherited from class it.unimi.dsi.fastutil.ints.AbstractIntCollection

add, contains, containsAll, containsAll, forEach, remove, removeAll, removeAll, removeIf, retainAll, retainAll, toIntArray

Methods inherited from class java.util.AbstractCollection

isEmpty, size, toArray, toArray

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Collection

toArray

Methods inherited from interface it.unimi.dsi.fastutil.ints.IntCollection

containsAll, intIterator, intParallelStream, intSpliterator, intStream, parallelStream, removeAll, removeIf, removeIf, removeIf, retainAll, spliterator, stream, toIntArray

Methods inherited from interface it.unimi.dsi.fastutil.ints.IntIterable

forEach, forEach

Methods inherited from interface it.unimi.dsi.fastutil.ints.IntList

add, add, addAll, addAll, contains, get, getInt, indexOf, lastIndexOf, remove, remove, replaceAll, replaceAll, set, setElements, setElements, sort, sort, spliterator, unstableSort, unstableSort

Methods inherited from interface it.unimi.dsi.fastutil.ints.IntStack

peek, pop, push, top

Methods inherited from interface java.util.List

containsAll, isEmpty, removeAll, retainAll, size, toArray, toArray

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

isEmpty

Method Details

add

public void add(int index,
 int k)

Inserts the specified element at the specified position in this list (optional operation).

Specified by:

add in interface IntList

See Also:

• List.add(int,Object)

Implementation Specification:

This implementation always throws an UnsupportedOperationException.

add

public boolean add(int k)

Ensures that this collection contains the specified element (optional operation).

Specified by:

add in interface IntCollection

Specified by:

add in interface IntList

Overrides:

add in class AbstractIntCollection

See Also:

• Collection.add(Object)

Implementation Specification:

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

removeInt

public int removeInt(int i)

Removes the element at the specified position in this list (optional operation).

Specified by:

removeInt in interface IntList

See Also:

• List.remove(int)

Implementation Specification:

This implementation always throws an UnsupportedOperationException.

set

public int set(int index,
 int k)

Replaces the element at the specified position in this list with the specified element (optional operation).

Specified by:

set in interface IntList

See Also:

• List.set(int,Object)

Implementation Specification:

This implementation always throws an UnsupportedOperationException.

addAll

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

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

Specified by:

addAll in interface List<Integer>

addAll

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

Specified by:

addAll in interface Collection<Integer>

Specified by:

addAll in interface List<Integer>

Overrides:

addAll in class AbstractIntCollection

Implementation Specification:

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

iterator

public IntListIterator iterator()

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

Specified by:

iterator in interface Collection<Integer>

Specified by:

iterator in interface IntCollection

Specified by:

iterator in interface IntIterable

Specified by:

iterator in interface IntList

Specified by:

iterator in interface Iterable<Integer>

Specified by:

iterator in interface List<Integer>

Specified by:

iterator in class AbstractIntCollection

Returns:

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

See Also:

• Iterable.iterator()

Implementation Specification:

This implementation delegates to listIterator().

listIterator

public IntListIterator listIterator()

Returns a type-specific list iterator on the list.

Specified by:

listIterator in interface IntList

Specified by:

listIterator in interface List<Integer>

See Also:

• List.listIterator()

Implementation Specification:

This implementation delegates to listIterator(0).

listIterator

public IntListIterator listIterator(int index)

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

Specified by:

listIterator in interface IntList

Specified by:

listIterator in interface List<Integer>

See Also:

• List.listIterator(int)

Implementation Specification:

This implementation is based on the random-access methods.

contains

public boolean contains(int k)

Returns true if this list contains the specified element.

Specified by:

contains in interface IntCollection

Overrides:

contains in class AbstractIntCollection

See Also:

• List.contains(Object)

Implementation Specification:

This implementation delegates to indexOf().

indexOf

public int indexOf(int k)

Description copied from interface: IntList

Returns the index of the first occurrence of the specified element in this list, or -1 if this list does not contain the element.

Specified by:

indexOf in interface IntList

See Also:

• List.indexOf(Object)

lastIndexOf

public int lastIndexOf(int k)

Description copied from interface: IntList

Returns the index of the last occurrence of the specified element in this list, or -1 if this list does not contain the element.

Specified by:

lastIndexOf in interface IntList

See Also:

• List.lastIndexOf(Object)

size

public void size(int size)

Description copied from interface: IntList

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 IntList

Parameters:

size - the new size.

subList

public IntList subList(int from,
 int to)

Description copied from interface: IntList

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 IntList

Specified by:

subList in interface List<Integer>

See Also:

• List.subList(int,int)

forEach

public void forEach(IntConsumer action)

Performs the given action for each element of this type-specific Iterable until all elements have been processed or the action throws an exception.

Specified by:

forEach in interface IntIterable

Parameters:

action - the action to be performed for each element.

See Also:

• Iterable.forEach(java.util.function.Consumer)

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 IntList

Parameters:

from - the start index (inclusive).

to - the end index (exclusive).

addElements

public void addElements(int index,
 int[] 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 IntList

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,
 int[] a)

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

Specified by:

addElements in interface IntList

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,
 int[] 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 IntList

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,
 int[] a,
 int offset,
 int length)

Description copied from interface: IntList

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 IntList

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<Integer>

Specified by:

clear in interface List<Integer>

Overrides:

clear in class AbstractCollection<Integer>

Implementation Specification:

This implementation delegates to removeElements(int, int).

hashCode

public int hashCode()

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

Specified by:

hashCode in interface Collection<Integer>

Specified by:

hashCode in interface List<Integer>

Overrides:

hashCode in class Object

Returns:

the hash code for this list.

equals

public boolean equals(Object o)

Specified by:

equals in interface Collection<Integer>

Specified by:

equals in interface List<Integer>

Overrides:

equals in class Object

compareTo

public int compareTo(List<? extends Integer> l)

Compares this list to another object. If the argument is a List, this method performs a lexicographical comparison; otherwise, it throws a ClassCastException.

Specified by:

compareTo in interface Comparable<List<? extends Integer>>

Parameters:

l - a list.

Returns:

if the argument is a List, a negative integer, zero, or a positive integer as this list is lexicographically less than, equal to, or greater than the argument.

Throws:

ClassCastException - if the argument is not a list.

push

public void push(int o)

Description copied from interface: IntStack

Pushes the given object on the stack.

Specified by:

push in interface IntStack

Parameters:

o - the object to push on the stack.

See Also:

• Stack.push(Object)

popInt

public int popInt()

Description copied from interface: IntStack

Pops the top off the stack.

Specified by:

popInt in interface IntStack

Returns:

the top of the stack.

See Also:

• Stack.pop()

topInt

public int topInt()

Description copied from interface: IntStack

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

Specified by:

topInt in interface IntStack

Returns:

the top of the stack.

See Also:

• Stack.top()

peekInt

public int peekInt(int i)

Description copied from interface: IntStack

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

Specified by:

peekInt in interface IntStack

Parameters:

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

Returns:

the i-th element on the stack.

See Also:

• Stack.peek(int)

rem

public boolean rem(int k)

Removes a single instance of the specified element from this collection, if it is present (optional operation).

Specified by:

rem in interface IntCollection

Overrides:

rem in class AbstractIntCollection

See Also:

• List.remove(Object)

Implementation Specification:

This implementation delegates to indexOf().

toIntArray

public int[] toIntArray()

Description copied from interface: IntCollection

Returns a primitive type array containing the items of this collection.

Specified by:

toIntArray in interface IntCollection

Overrides:

toIntArray in class AbstractIntCollection

Returns:

a primitive type array containing the items of this collection.

See Also:

• Collection.toArray()

toArray

public int[] toArray(int[] a)

Description copied from interface: IntCollection

Returns an array containing all of the elements in this collection; the runtime type of the returned array is that of the specified array.

Note that, contrarily to Collection.toArray(Object[]), this methods just writes all elements of this collection: no special value will be added after the last one.

Specified by:

toArray in interface IntCollection

Overrides:

toArray in class AbstractIntCollection

Parameters:

a - if this array is big enough, it will be used to store this collection.

Returns:

a primitive type array containing the items of this collection.

See Also:

• Collection.toArray(Object[])

addAll

public boolean addAll(int index,
 IntCollection c)

Description copied from interface: IntList

Inserts all of the elements in the specified type-specific collection into this type-specific list at the specified position (optional operation).

Specified by:

addAll in interface IntList

See Also:

• List.addAll(int,java.util.Collection)

addAll

public boolean addAll(IntCollection c)

Adds all elements of the given type-specific collection to this collection.

Specified by:

addAll in interface IntCollection

Overrides:

addAll in class AbstractIntCollection

Parameters:

c - a type-specific collection.

Returns:

true if this collection changed as a result of the call.

See Also:

• Collection.addAll(Collection)

Implementation Specification:

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

replaceAll

public final void replaceAll(IntUnaryOperator operator)

Replaces each element of this list with the result of applying the operator to that element.

WARNING: Overriding this method is almost always a mistake, as this overload only exists to disambiguate. Instead, override the replaceAll() overload that uses the JDK's primitive unary operator type (e.g. IntUnaryOperator).

If Java supported final default methods, this would be one, but sadly it does not.

If you checked and are overriding the version with java.util.function.XUnaryOperator, and still see this warning, then your IDE is incorrectly conflating this method with the proper method to override, and you can safely ignore this message.

Specified by:

replaceAll in interface IntList

Parameters:

operator - the operator to apply to each element

See Also:

• List.replaceAll(java.util.function.UnaryOperator<E>)

Implementation Specification:

This method just delegates to the interface default method, as the default method, but it is final, so it cannot be overridden.

toString

public String toString()

Overrides:

toString in class AbstractIntCollection