Package it.unimi.dsi.fastutil.longs

Class LongArraySet

java.lang.Object

java.util.AbstractCollection<java.lang.Long>

it.unimi.dsi.fastutil.longs.AbstractLongCollection

it.unimi.dsi.fastutil.longs.AbstractLongSet

it.unimi.dsi.fastutil.longs.LongArraySet

All Implemented Interfaces:

LongCollection, LongIterable, LongSet, java.io.Serializable, java.lang.Cloneable, java.lang.Iterable<java.lang.Long>, java.util.Collection<java.lang.Long>, java.util.Set<java.lang.Long>

public class LongArraySet
extends AbstractLongSet
implements java.io.Serializable, java.lang.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
LongArraySet()	Creates a new empty array set.
LongArraySet(int capacity)	Creates a new empty array set of given initial capacity.
LongArraySet(long[] a)	Creates a new array set using the given backing array.
LongArraySet(long[] a, int size)	Creates a new array set using the given backing array and the given number of elements of the array.
LongArraySet(LongCollection c)	Creates a new array set copying the contents of a given collection.
LongArraySet(java.util.Collection<? extends java.lang.Long> c)	Creates a new array set copying the contents of a given set.

Method Summary

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

Methods inherited from class java.util.AbstractCollection

addAll, containsAll, removeAll, retainAll, toArray, toArray

Methods inherited from class it.unimi.dsi.fastutil.longs.AbstractLongCollection

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

Methods inherited from class it.unimi.dsi.fastutil.longs.AbstractLongSet

equals, hashCode, rem

Methods inherited from interface java.util.Collection

parallelStream, stream

Methods inherited from interface it.unimi.dsi.fastutil.longs.LongCollection

addAll, containsAll, removeAll, removeIf, removeIf, retainAll, toArray, toLongArray, toLongArray

Methods inherited from interface it.unimi.dsi.fastutil.longs.LongIterable

forEach, forEach

Methods inherited from interface it.unimi.dsi.fastutil.longs.LongSet

add, contains, remove

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Set

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

Constructor Detail

LongArraySet

public LongArraySet(long[] 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.

LongArraySet

public LongArraySet()

Creates a new empty array set.

LongArraySet

public LongArraySet(int capacity)

Creates a new empty array set of given initial capacity.

Parameters:

capacity - the initial capacity.

LongArraySet

public LongArraySet(LongCollection c)

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

Parameters:

c - a collection.

LongArraySet

public LongArraySet(java.util.Collection<? extends java.lang.Long> c)

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

Parameters:

c - a collection.

LongArraySet

public LongArraySet(long[] 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 LongIterator iterator()

Description copied from interface: LongCollection

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 java.util.Collection<java.lang.Long>

Specified by:

iterator in interface java.lang.Iterable<java.lang.Long>

Specified by:

iterator in interface LongCollection

Specified by:

iterator in interface LongIterable

Specified by:

iterator in interface LongSet

Specified by:

iterator in interface java.util.Set<java.lang.Long>

Specified by:

iterator in class AbstractLongSet

Returns:

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

See Also:

Iterable.iterator()

contains

public boolean contains(long k)

Description copied from class: AbstractLongCollection

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 LongCollection

Overrides:

contains in class AbstractLongCollection

See Also:

Collection.contains(Object)

size

public int size()

Specified by:

size in interface java.util.Collection<java.lang.Long>

Specified by:

size in interface java.util.Set<java.lang.Long>

Specified by:

size in class java.util.AbstractCollection<java.lang.Long>

remove

public boolean remove(long k)

Description copied from class: AbstractLongSet

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 LongSet

Overrides:

remove in class AbstractLongSet

See Also:

Collection.remove(Object)

add

public boolean add(long k)

Description copied from class: AbstractLongCollection

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

This implementation always throws an UnsupportedOperationException.

Specified by:

add in interface LongCollection

Overrides:

add in class AbstractLongCollection

See Also:

Collection.add(Object)

clear

public void clear()

Specified by:

clear in interface java.util.Collection<java.lang.Long>

Specified by:

clear in interface java.util.Set<java.lang.Long>

Overrides:

clear in class java.util.AbstractCollection<java.lang.Long>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface java.util.Collection<java.lang.Long>

Specified by:

isEmpty in interface java.util.Set<java.lang.Long>

Overrides:

isEmpty in class java.util.AbstractCollection<java.lang.Long>

clone

public LongArraySet 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.