io.lacuna.bifurcan

Class List<V>

java.lang.Object

io.lacuna.bifurcan.List<V>

All Implemented Interfaces:

ICollection<IList<V>,V>, IList<V>, Cloneable, Iterable<V>

public class List<V>
extends Object
implements IList<V>, Cloneable

An implementation of an immutable list which allows for elements to be added and removed from both ends of the collection, as well as random-access reads and writes. Due to its relaxed radix structure, slice(), concat(), and split() are near-constant time.

Field Summary

Fields

Modifier and Type	Field and Description
static List	EMPTY
Object[]	prefix
Object[]	suffix

Constructor Summary

Constructors

Modifier	Constructor and Description
	List()
protected	List(boolean linear, io.lacuna.bifurcan.nodes.ListNodes.Node root, int prefixLen, Object[] prefix, int suffixLen, Object[] suffix)

Method Summary

Modifier and Type	Method and Description
List<V>	addFirst(V value)
List<V>	addLast(V value)
List<V>	clone()
IList<V>	concat(IList<V> l)
boolean	equals(Object obj)
List<V>	forked() This returns a data structure which is forked, which is equivalent to Clojure's persistent data structures, also sometimes called functional or immutable.
static <V> List<V>	from(IList<V> list)
static <V> List<V>	from(Iterable<V> iterable)
static <V> List<V>	from(Iterator<V> iterator)
boolean	isLinear()
Iterator<V>	iterator()
List<V>	linear() This returns a data structure which is linear, or temporarily mutable.
V	nth(long idx)
static <V> List<V>	of(V... elements)
List<V>	removeFirst()
List<V>	removeLast()
List<V>	set(long idx, V value)
long	size()
List<V>	slice(long start, long end)
String	toString()

Methods inherited from class java.lang.Object

finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface io.lacuna.bifurcan.IList

equals, first, last, save, split, spliterator, stream, toArray, toArray, toList, update

Methods inherited from interface io.lacuna.bifurcan.ICollection

nth

Methods inherited from interface java.lang.Iterable

forEach

Field Detail

EMPTY

public static final List EMPTY

prefix

public Object[] prefix

suffix

public Object[] suffix

Constructor Detail

List

public List()

List

protected List(boolean linear,
               io.lacuna.bifurcan.nodes.ListNodes.Node root,
               int prefixLen,
               Object[] prefix,
               int suffixLen,
               Object[] suffix)

Method Detail

of

public static <V> List<V> of(V... elements)

from

public static <V> List<V> from(IList<V> list)

from

public static <V> List<V> from(Iterable<V> iterable)

from

public static <V> List<V> from(Iterator<V> iterator)

nth

public V nth(long idx)

Specified by:

nth in interface ICollection<IList<V>,V>

Returns:

the element at idx

size

public long size()

Specified by:

size in interface ICollection<IList<V>,V>

Returns:

the number of elements in the collection

isLinear

public boolean isLinear()

Specified by:

isLinear in interface ICollection<IList<V>,V>

Specified by:

isLinear in interface IList<V>

Returns:

true, if the list is linear

addLast

public List<V> addLast(V value)

Specified by:

addLast in interface IList<V>

Returns:

a new list, with value appended

addFirst

public List<V> addFirst(V value)

Specified by:

addFirst in interface IList<V>

Returns:

a new list, with value prepended

removeLast

public List<V> removeLast()

Specified by:

removeLast in interface IList<V>

Returns:

a new list with the last value removed, or the same list if already empty

removeFirst

public List<V> removeFirst()

Specified by:

removeFirst in interface IList<V>

Returns:

a new list with the first value removed, or the same value if already empty

set

public List<V> set(long idx,
                   V value)

Specified by:

set in interface IList<V>

Returns:

a new list, with the element at idx overwritten with value. If idx is equal to ICollection.size(), the value is appended.

iterator

public Iterator<V> iterator()

Specified by:

iterator in interface IList<V>

Specified by:

iterator in interface Iterable<V>

slice

public List<V> slice(long start,
                     long end)

Specified by:

slice in interface IList<V>

Parameters:

start - the inclusive start of the range

end - the exclusive end of the range

Returns:

a sub-range of the list within [start, end), which is linear if this is linear

concat

public IList<V> concat(IList<V> l)

Specified by:

concat in interface IList<V>

Parameters:

l - another list

Returns:

a new collection representing the concatenation of the two lists, which is linear if this is linear

forked

public List<V> forked()

Description copied from interface: ICollection

This returns a data structure which is forked, which is equivalent to Clojure's persistent data structures, also sometimes called functional or immutable. This is called "forked" because it means that multiple functions can make divergent changes to the data structure without affecting each other.

If only a single function or scope uses the data structure, it can be left as a linear data structure, which can have significant performance benefits.

If the data structure is already forked, it will simply return itself.

Specified by:

forked in interface ICollection<IList<V>,V>

Specified by:

forked in interface IList<V>

Returns:

a forked form of the data structure

linear

public List<V> linear()

Description copied from interface: ICollection

This returns a data structure which is linear, or temporarily mutable. The term "linear", as used here, does not completely align with the formal definition of linear types as used in type theory. It is meant to describe the linear dataflow of the method calls, and as a converse to "forked" data structures.

If ICollection.forked() is called on a linear collection, all references to that linear collection should be discarded.

If the data structure is already linear, it will simply return itself.

Specified by:

linear in interface ICollection<IList<V>,V>

Specified by:

linear in interface IList<V>

Returns:

a linear form of this data structure

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

toString

public String toString()

Overrides:

toString in class Object

clone

public List<V> clone()

Specified by:

clone in interface ICollection<IList<V>,V>

Overrides:

clone in class Object

Returns:

a cloned copy of the collection