it.unimi.dsi.fastutil.chars

Class CharArraySet

java.lang.Object

java.util.AbstractCollection<Character>

it.unimi.dsi.fastutil.chars.AbstractCharCollection

it.unimi.dsi.fastutil.chars.AbstractCharSet

it.unimi.dsi.fastutil.chars.CharArraySet

All Implemented Interfaces:

CharCollection, CharIterable, CharSet, Serializable, Cloneable, Iterable<Character>, Collection<Character>, Set<Character>

public class CharArraySet
extends AbstractCharSet
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 and Description
CharArraySet() Creates a new empty array set.
CharArraySet(char[] a) Creates a new array set using the given backing array.
CharArraySet(char[] a, int size) Creates a new array set using the given backing array and the given number of elements of the array.
CharArraySet(CharCollection c) Creates a new array set copying the contents of a given collection.
CharArraySet(Collection<? extends Character> c) Creates a new array set copying the contents of a given set.
CharArraySet(int capacity) Creates a new empty array set of given initial capacity.

Method Summary

Modifier and Type	Method and Description
boolean	add(char k) Ensures that this collection contains the specified element (optional operation).
void	clear()
CharArraySet	clone() Returns a deep copy of this set.
boolean	contains(char k) Returns true if this collection contains the specified element.
boolean	isEmpty()
CharIterator	iterator() Returns a type-specific iterator on the elements of this collection.
boolean	remove(char k) Removes an element from this set.
int	size()

Methods inherited from class it.unimi.dsi.fastutil.chars.AbstractCharSet

equals, hashCode, rem

Methods inherited from class it.unimi.dsi.fastutil.chars.AbstractCharCollection

add, addAll, contains, containsAll, remove, removeAll, retainAll, toArray, toCharArray, toCharArray, toString

Methods inherited from class java.util.AbstractCollection

addAll, containsAll, removeAll, retainAll, toArray, toArray

Methods inherited from class java.lang.Object

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

Methods inherited from interface it.unimi.dsi.fastutil.chars.CharSet

add, contains, remove

Methods inherited from interface it.unimi.dsi.fastutil.chars.CharCollection

addAll, containsAll, removeAll, removeIf, removeIf, retainAll, toArray, toCharArray, toCharArray

Methods inherited from interface it.unimi.dsi.fastutil.chars.CharIterable

forEach, forEach

Methods inherited from interface java.util.Set

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

Methods inherited from interface java.util.Collection

parallelStream, stream

Constructor Detail

CharArraySet

public CharArraySet(char[] 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.

CharArraySet

public CharArraySet()

Creates a new empty array set.

CharArraySet

public CharArraySet(int capacity)

Creates a new empty array set of given initial capacity.

Parameters:

capacity - the initial capacity.

CharArraySet

public CharArraySet(CharCollection c)

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

Parameters:

c - a collection.

CharArraySet

public CharArraySet(Collection<? extends Character> c)

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

Parameters:

c - a collection.

CharArraySet

public CharArraySet(char[] 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 CharIterator iterator()

Description copied from interface: CharCollection

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 CharCollection

Specified by:

iterator in interface CharIterable

Specified by:

iterator in interface CharSet

Specified by:

iterator in interface Iterable<Character>

Specified by:

iterator in interface Collection<Character>

Specified by:

iterator in interface Set<Character>

Specified by:

iterator in class AbstractCharSet

Returns:

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

See Also:

Iterable.iterator()

contains

public boolean contains(char k)

Description copied from class: AbstractCharCollection

Returns true if this collection contains the specified element.

This implementation iterates over the elements in the collection, looking for the specified element.

Specified by:

contains in interface CharCollection

Overrides:

contains in class AbstractCharCollection

See Also:

Collection.contains(Object)

size

public int size()

Specified by:

size in interface Collection<Character>

Specified by:

size in interface Set<Character>

Specified by:

size in class AbstractCollection<Character>

remove

public boolean remove(char k)

Description copied from class: AbstractCharSet

Removes an element from this set.

Note that the corresponding method of a type-specific collection is rem(). This unfortunate situation is caused by the clash with the similarly named index-based method in the List interface. Delegates to the type-specific rem() method implemented by type-specific abstract Collection superclass.

Specified by:

remove in interface CharSet

Overrides:

remove in class AbstractCharSet

See Also:

Collection.remove(Object)

add

public boolean add(char k)

Description copied from class: AbstractCharCollection

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

This implementation always throws an UnsupportedOperationException.

Specified by:

add in interface CharCollection

Overrides:

add in class AbstractCharCollection

See Also:

Collection.add(Object)

clear

public void clear()

Specified by:

clear in interface Collection<Character>

Specified by:

clear in interface Set<Character>

Overrides:

clear in class AbstractCollection<Character>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Collection<Character>

Specified by:

isEmpty in interface Set<Character>

Overrides:

isEmpty in class AbstractCollection<Character>

clone

public CharArraySet 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.

Overrides:

clone in class Object

Returns:

a deep copy of this set.