Class MapPBag<E>

java.lang.Object

java.util.AbstractCollection<E>

org.pcollections.AbstractUnmodifiableCollection<E>

org.pcollections.MapPBag<E>

Type Parameters:

E -

All Implemented Interfaces:

Serializable, Iterable<E>, Collection<E>, PBag<E>, PCollection<E>

public final class MapPBag<E>
extends AbstractUnmodifiableCollection<E>
implements PBag<E>, Serializable

A map-backed persistent bag.

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

See Also:

• Serialized Form

Field Summary

Fields

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

Constructor Summary

Constructors

Modifier	Constructor	Description
private	MapPBag(PMap<E,Integer> map, int size)

Method Summary

Modifier and Type	Method	Description
boolean	contains(Object e)	/ OVERRIDDEN METHODS OF AbstractCollection ////
private int	count(Object o)	/ PRIVATE UTILITIES ////
static <E> MapPBag<E>	empty(PMap<E,Integer> map)
boolean	equals(Object that)
int	hashCode()
Iterator<E>	iterator()
MapPBag<E>	minus(Object e)
MapPBag<E>	minusAll(Collection<?> list)
MapPBag<E>	plus(E e)	/ IMPLEMENTED METHODS OF PSet ////
MapPBag<E>	plusAll(Collection<? extends E> list)
int	size()	/ REQUIRED METHODS FROM AbstractCollection ////
private static int	size(PMap<?,Integer> map)	/ PRIVATE STATIC UTILITIES ////

Methods inherited from class AbstractUnmodifiableCollection

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

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

containsAll, isEmpty, parallelStream, removeIf, spliterator, stream, toArray, toArray, toArray

Methods inherited from interface Iterable

forEach

Methods inherited from interface PCollection

add, addAll, clear, remove, removeAll, retainAll

Field Details

serialVersionUID

private static final long serialVersionUID

See Also:

• Constant Field Values

map

private final PMap<E,Integer> map

/ PRIVATE CONSTRUCTORS ////

size

private final int size

Constructor Details

MapPBag

private MapPBag(PMap<E,Integer> map,
 int size)

Method Details

empty

public static <E> MapPBag<E> empty(PMap<E,Integer> map)

Type Parameters:

E -

Parameters:

map -

Returns:

a PBag backed by an empty version of map, i.e. by map.minusAll(map.keySet())

size

public int size()

/ REQUIRED METHODS FROM AbstractCollection ////

Specified by:

size in interface Collection<E>

Specified by:

size in class AbstractCollection<E>

iterator

public Iterator<E> iterator()

Specified by:

iterator in interface Collection<E>

Specified by:

iterator in interface Iterable<E>

Specified by:

iterator in class AbstractCollection<E>

contains

public boolean contains(Object e)

/ OVERRIDDEN METHODS OF AbstractCollection ////

Specified by:

contains in interface Collection<E>

Overrides:

contains in class AbstractCollection<E>

hashCode

public int hashCode()

Specified by:

hashCode in interface Collection<E>

Overrides:

hashCode in class Object

equals

public boolean equals(Object that)

Specified by:

equals in interface Collection<E>

Overrides:

equals in class Object

plus

public MapPBag<E> plus(E e)

/ IMPLEMENTED METHODS OF PSet ////

Specified by:

plus in interface PBag<E>

Specified by:

plus in interface PCollection<E>

Parameters:

e -

Returns:

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

minus

public MapPBag<E> minus(Object e)

Specified by:

minus in interface PBag<E>

Specified by:

minus in interface PCollection<E>

Parameters:

e -

Returns:

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

plusAll

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

Specified by:

plusAll in interface PBag<E>

Specified by:

plusAll in interface PCollection<E>

Parameters:

list -

Returns:

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

minusAll

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

Specified by:

minusAll in interface PBag<E>

Specified by:

minusAll in interface PCollection<E>

Parameters:

list -

Returns:

this with all elements of list completely removed

count

private int count(Object o)

/ PRIVATE UTILITIES ////

size

private static int size(PMap<?,Integer> map)

/ PRIVATE STATIC UTILITIES ////