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:

it.unimi.dsi.fastutil.longs.LongCollection, it.unimi.dsi.fastutil.longs.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

Field Summary

Fields

Modifier and Type	Field and Description
protected long[]	a The backing array (valid up to size, excluded).
protected int	size The number of valid entries in a.

Constructor Summary

Constructors

Constructor and Description
LongArraySet() Creates a new empty array set.
LongArraySet(java.util.Collection<? extends java.lang.Long> c) Creates a new array set copying the contents of a given 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(it.unimi.dsi.fastutil.longs.LongCollection c) Creates a new array set copying the contents of a given collection.
LongArraySet(LongSet c) Creates a new array set copying the contents of a given collection.
LongArraySet(java.util.Set<? extends java.lang.Long> c) Creates a new array set copying the contents of a given set.

Method Summary

Modifier and Type	Method and Description
boolean	add(long k)
void	clear()
LongArraySet	clone() Returns a deep copy of this set.
boolean	contains(long k)
boolean	isEmpty()
it.unimi.dsi.fastutil.longs.LongIterator	iterator() Returns a type-specific iterator on the elements of this set.
static LongArraySet	of() Creates a new empty array set.
static LongArraySet	of(long... a) Creates a new array set using an array of elements.
static LongArraySet	of(long e) Creates a new array set using the element given.
static LongArraySet	ofUnchecked() Creates a new empty array set.
static LongArraySet	ofUnchecked(long... a) Creates a new array set using an array of elements.
boolean	remove(long k) Removes an element from this set.
int	size()
it.unimi.dsi.fastutil.longs.LongSpliterator	spliterator() Returns a type-specific spliterator on the elements of this set.
long[]	toArray(long[] a)
long[]	toLongArray()

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

equals, hashCode, rem

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

add, addAll, addAll, contains, containsAll, containsAll, forEach, remove, removeAll, removeAll, removeIf, retainAll, retainAll, toLongArray, toString

Methods inherited from class java.util.AbstractCollection

toArray, toArray

Methods inherited from class java.lang.Object

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

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

add, contains, of, of, remove

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

addAll, containsAll, longIterator, longParallelStream, longSpliterator, longStream, parallelStream, removeAll, removeIf, removeIf, removeIf, retainAll, stream, toLongArray

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

forEach, forEach, forEach

Methods inherited from interface java.util.Set

addAll, containsAll, removeAll, retainAll, toArray, toArray

Field Detail

a

protected transient long[] a

The backing array (valid up to size, excluded).

size

protected int size

The number of valid entries in a.

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 the responsibility of the caller to ensure 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(it.unimi.dsi.fastutil.longs.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(LongSet c)

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

Parameters:

c - a collection.

LongArraySet

public LongArraySet(java.util.Set<? 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 the responsibility of the caller to ensure that the first size elements of a are distinct.

Parameters:

a - the backing array.

size - the number of valid elements in a.

Method Detail

of

public static LongArraySet of()

Creates a new empty array set.

Specified by:

of in interface LongSet

Returns:

a new empty array set.

of

public static LongArraySet of(long e)

Creates a new array set using the element given.

Specified by:

of in interface LongSet

Parameters:

e - the element that the returned set will contain.

Returns:

a new array set containing e.

of

public static LongArraySet of(long... a)

Creates a new array set using an array of elements.

Unlike the array accepting constructors, this method will throw if duplicate elements are encountered. This adds a non-trivial validation burden. Use ofUnchecked() if you know your input has no duplicates, which will skip this validation.

Specified by:

of in interface LongSet

Parameters:

a - the backing array of the returned array set.

Returns:

a new array set containing the elements in a.

Throws:

java.lang.IllegalArgumentException - if there were duplicate entries.

ofUnchecked

public static LongArraySet ofUnchecked()

Creates a new empty array set.

Returns:

a new empty array set.

ofUnchecked

public static LongArraySet ofUnchecked(long... a)

Creates a new array set using an array of elements.

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

Parameters:

a - the backing array of the returned array set.

Returns:

a new array set containing the elements in a.

iterator

public it.unimi.dsi.fastutil.longs.LongIterator iterator()

Description copied from interface: LongSet

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

Specified by:

iterator in interface it.unimi.dsi.fastutil.longs.LongCollection

Specified by:

iterator in interface it.unimi.dsi.fastutil.longs.LongIterable

Specified by:

iterator in interface LongSet

Specified by:

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

Specified by:

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

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 set.

spliterator

public it.unimi.dsi.fastutil.longs.LongSpliterator spliterator()

Returns a type-specific spliterator on the elements of this set.

Set spliterators must report at least Spliterator.DISTINCT.

See Set.spliterator() for more documentation on the requirements of the returned spliterator.

In addition to the usual trait of DISTINCT for sets, the returned spliterator will also report the trait ORDERED.

The returned spliterator is late-binding; it will track structural changes after the current item, up until the first trySplit(), at which point the maximum index will be fixed.
Structural changes before the current item or after the first trySplit() will result in unspecified behavior.

Specified by:

spliterator in interface it.unimi.dsi.fastutil.longs.LongCollection

Specified by:

spliterator in interface it.unimi.dsi.fastutil.longs.LongIterable

Specified by:

spliterator in interface LongSet

Specified by:

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

Specified by:

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

Specified by:

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

Returns:

contains

public boolean contains(long k)

Specified by:

contains in interface it.unimi.dsi.fastutil.longs.LongCollection

Overrides:

contains in class it.unimi.dsi.fastutil.longs.AbstractLongCollection

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. 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)

Specified by:

add in interface it.unimi.dsi.fastutil.longs.LongCollection

Overrides:

add in class it.unimi.dsi.fastutil.longs.AbstractLongCollection

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>

toLongArray

public long[] toLongArray()

Specified by:

toLongArray in interface it.unimi.dsi.fastutil.longs.LongCollection

Overrides:

toLongArray in class it.unimi.dsi.fastutil.longs.AbstractLongCollection

toArray

public long[] toArray(long[] a)

Specified by:

toArray in interface it.unimi.dsi.fastutil.longs.LongCollection

Overrides:

toArray in class it.unimi.dsi.fastutil.longs.AbstractLongCollection

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.

Overrides:

clone in class java.lang.Object

Returns:

a deep copy of this set.