Package it.unimi.dsi.fastutil.objects

Class ObjectArraySet<K>

java.lang.Object

java.util.AbstractCollection<K>

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

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

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

All Implemented Interfaces:

ObjectCollection<K>, ObjectIterable<K>, ObjectSet<K>, Serializable, Cloneable, Iterable<K>, Collection<K>, Set<K>

public class ObjectArraySet<K>
extends AbstractObjectSet<K>
implements Serializable, Cloneable

A simple, brute-force implementation of a set based on a backing array.

The main purpose of this implementation is that of wrapping cleanly the brute-force approach to the storage of a very small number of items: just put them into an array and scan linearly to find an item.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor	Description
ObjectArraySet()	Creates a new empty array set.
ObjectArraySet(int capacity)	Creates a new empty array set of given initial capacity.
ObjectArraySet(ObjectCollection<K> c)	Creates a new array set copying the contents of a given collection.
ObjectArraySet(Object[] a)	Creates a new array set using the given backing array.
ObjectArraySet(Object[] a, int size)	Creates a new array set using the given backing array and the given number of elements of the array.
ObjectArraySet(Collection<? extends K> c)	Creates a new array set copying the contents of a given set.

Method Summary

Modifier and Type	Method	Description
boolean	add(K k)
void	clear()
ObjectArraySet<K>	clone()	Returns a deep copy of this set.
boolean	contains(Object k)
boolean	isEmpty()
ObjectIterator<K>	iterator()	Returns a type-specific iterator on the elements of this collection.
boolean	remove(Object k)
int	size()

Methods inherited from class it.unimi.dsi.fastutil.objects.AbstractObjectSet

equals, hashCode

Methods inherited from class it.unimi.dsi.fastutil.objects.AbstractObjectCollection

toString

Methods inherited from class java.util.AbstractCollection

addAll, containsAll, removeAll, retainAll, toArray, toArray

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.lang.Iterable

forEach

Methods inherited from interface java.util.Set

addAll, containsAll, removeAll, retainAll, spliterator, toArray, toArray

Constructor Detail

ObjectArraySet

public ObjectArraySet(Object[] a)

Creates a new array set using the given backing array. The resulting set will have as many elements as the array.

It is responsibility of the caller that the elements of a are distinct.

Parameters:

a - the backing array.

ObjectArraySet

public ObjectArraySet()

Creates a new empty array set.

ObjectArraySet

public ObjectArraySet(int capacity)

Creates a new empty array set of given initial capacity.

Parameters:

capacity - the initial capacity.

ObjectArraySet

public ObjectArraySet(ObjectCollection<K> c)

Creates a new array set copying the contents of a given collection.

Parameters:

c - a collection.

ObjectArraySet

public ObjectArraySet(Collection<? extends K> c)

Creates a new array set copying the contents of a given set.

Parameters:

c - a collection.

ObjectArraySet

public ObjectArraySet(Object[] a,
                      int size)

Creates a new array set using the given backing array and the given number of elements of the array.

It is responsibility of the caller that the first size elements of a are distinct.

Parameters:

a - the backing array.

size - the number of valid elements in a.

Method Detail

iterator

public ObjectIterator<K> iterator()

Description copied from interface: ObjectCollection

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

Note that this specification strengthens the one given in Iterable.iterator(), which was already strengthened in the corresponding type-specific class, but was weakened by the fact that this interface extends Collection.

Specified by:

iterator in interface Collection<K>

Specified by:

iterator in interface Iterable<K>

Specified by:

iterator in interface ObjectCollection<K>

Specified by:

iterator in interface ObjectIterable<K>

Specified by:

iterator in interface ObjectSet<K>

Specified by:

iterator in interface Set<K>

Specified by:

iterator in class AbstractObjectSet<K>

Returns:

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

See Also:

Iterable.iterator()

contains

public boolean contains(Object k)

Specified by:

contains in interface Collection<K>

Specified by:

contains in interface Set<K>

Overrides:

contains in class AbstractCollection<K>

size

public int size()

Specified by:

size in interface Collection<K>

Specified by:

size in interface Set<K>

Specified by:

size in class AbstractCollection<K>

remove

public boolean remove(Object k)

Specified by:

remove in interface Collection<K>

Specified by:

remove in interface Set<K>

Overrides:

remove in class AbstractCollection<K>

add

public boolean add(K k)

Specified by:

add in interface Collection<K>

Specified by:

add in interface Set<K>

Overrides:

add in class AbstractCollection<K>

clear

public void clear()

Specified by:

clear in interface Collection<K>

Specified by:

clear in interface Set<K>

Overrides:

clear in class AbstractCollection<K>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Collection<K>

Specified by:

isEmpty in interface Set<K>

Overrides:

isEmpty in class AbstractCollection<K>

clone

public ObjectArraySet<K> clone()

Returns a deep copy of this set.

This method performs a deep copy of this array set; the data stored in the set, however, is not cloned. Note that this makes a difference only for object keys.

Returns:

a deep copy of this set.