Class MapPSet<E>

java.lang.Object

java.util.AbstractCollection<E>

java.util.AbstractSet<E>

org.pcollections.AbstractUnmodifiableSet<E>

org.pcollections.MapPSet<E>

Type Parameters:

E -

All Implemented Interfaces:

Serializable, Iterable<E>, Collection<E>, Set<E>, PCollection<E>, PSet<E>

public final class MapPSet<E>
extends AbstractUnmodifiableSet<E>
implements PSet<E>, Serializable

A map-backed persistent set.

If the backing map is thread-safe, then this implementation is thread-safe (assuming Java's AbstractSet is thread-safe), although its iterators may not be.

See Also:

• Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static enum	MapPSet.In	/ IMPLEMENTED METHODS OF PSet ////

Field Summary

Fields

Modifier and Type	Field	Description
private final PMap<E,Object>	map	/ PRIVATE CONSTRUCTORS ////
private static final long	serialVersionUID

Constructor Summary

Constructors

Modifier	Constructor	Description
private	MapPSet(PMap<E,Object> map)

Method Summary

Modifier and Type	Method	Description
boolean	contains(Object e)	/ OVERRIDDEN METHODS OF AbstractSet ////
static <E> MapPSet<E>	from(PMap<E,?> map)
static <E> MapPSet<E>	from(PMap<E,?> map, E e)
static <E> MapPSet<E>	from(PMap<E,?> map, Collection<? extends E> list)
MapPSet<E>	intersect(Collection<? extends E> list)
Iterator<E>	iterator()	/ REQUIRED METHODS FROM AbstractSet ////
MapPSet<E>	minus(Object e)
MapPSet<E>	minusAll(Collection<?> list)
MapPSet<E>	plus(E e)
MapPSet<E>	plusAll(Collection<? extends E> list)
int	size()

Methods inherited from class AbstractUnmodifiableSet

add, addAll, clear, remove, removeAll, removeIf, retainAll

Methods inherited from class AbstractSet

equals, hashCode

Methods inherited from class AbstractCollection

containsAll, isEmpty, toArray, toArray, toString

Methods inherited from class Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface Collection

parallelStream, removeIf, stream, toArray

Methods inherited from interface Iterable

forEach

Methods inherited from interface PCollection

add, addAll, clear, remove, removeAll, retainAll

Methods inherited from interface Set

add, addAll, clear, containsAll, equals, hashCode, isEmpty, remove, removeAll, retainAll, spliterator, toArray, toArray

Field Details

serialVersionUID

private static final long serialVersionUID

See Also:

• Constant Field Values

map

private final PMap<E,Object> map

/ PRIVATE CONSTRUCTORS ////

Constructor Details

MapPSet

private MapPSet(PMap<E,Object> map)

Method Details

from

public static <E> MapPSet<E> from(PMap<E,?> map)

Type Parameters:

E -

Parameters:

map -

Returns:

a PSet with the elements of map.keySet(), backed by map

from

public static <E> MapPSet<E> from(PMap<E,?> map,
 E e)

Type Parameters:

E -

Parameters:

map -

e -

Returns:

from(map).plus(e)

from

public static <E> MapPSet<E> from(PMap<E,?> map,
 Collection<? extends E> list)

Type Parameters:

E -

Parameters:

map -

list -

Returns:

from(map).plusAll(list)

iterator

public Iterator<E> iterator()

/ REQUIRED METHODS FROM AbstractSet ////

Specified by:

iterator in interface Collection<E>

Specified by:

iterator in interface Iterable<E>

Specified by:

iterator in interface Set<E>

Specified by:

iterator in class AbstractCollection<E>

size

public int size()

Specified by:

size in interface Collection<E>

Specified by:

size in interface Set<E>

Specified by:

size in class AbstractCollection<E>

contains

public boolean contains(Object e)

/ OVERRIDDEN METHODS OF AbstractSet ////

Specified by:

contains in interface Collection<E>

Specified by:

contains in interface Set<E>

Overrides:

contains in class AbstractCollection<E>

plus

public MapPSet<E> plus(E e)

Specified by:

plus in interface PCollection<E>

Specified by:

plus in interface PSet<E>

Parameters:

e -

Returns:

a collection which contains e and all of the elements of this

minus

public MapPSet<E> minus(Object e)

Specified by:

minus in interface PCollection<E>

Specified by:

minus in interface PSet<E>

Parameters:

e -

Returns:

this with a single instance of e removed, if e is in this

plusAll

public MapPSet<E> plusAll(Collection<? extends E> list)

Specified by:

plusAll in interface PCollection<E>

Specified by:

plusAll in interface PSet<E>

Parameters:

list -

Returns:

a collection which contains all of the elements of list and this

minusAll

public MapPSet<E> minusAll(Collection<?> list)

Specified by:

minusAll in interface PCollection<E>

Specified by:

minusAll in interface PSet<E>

Parameters:

list -

Returns:

this with all elements of list completely removed

intersect

public MapPSet<E> intersect(Collection<? extends E> list)

Specified by:

intersect in interface PSet<E>

Returns:

the equivalent of this.minusAll(this.minusAll(list)).