it.unimi.dsi.fastutil.longs
Class LongCollections.EmptyCollection

java.lang.Object
  it.unimi.dsi.fastutil.longs.AbstractLongCollection
      it.unimi.dsi.fastutil.longs.LongCollections.EmptyCollection

All Implemented Interfaces:

LongCollection, LongIterable, Iterable<Long>, Collection<Long>

Direct Known Subclasses:

LongLists.EmptyList, LongSets.EmptySet

Enclosing class:

LongCollections

public abstract static class LongCollections.EmptyCollection
extends AbstractLongCollection

An immutable class representing an empty type-specific collection.

This class may be useful to implement your own in case you subclass a type-specific collection.

Method Summary

boolean	add(long k)
boolean	addAll(LongCollection c) Adds all elements of the given type-specific collection to this collection.
void	clear()
boolean	contains(long k)
boolean	containsAll(LongCollection c) Checks whether this collection contains all elements from the given type-specific collection.
boolean	equals(Object o)
int	hashCode()
LongListIterator	iterator() Returns a type-specific iterator on the elements of this collection.
boolean	rem(long k) Note that this method should be called remove(), but the clash with the similarly named index-based method in the List interface forces us to use a distinguished name.
boolean	removeAll(LongCollection c) Remove from this collection all elements in the given type-specific collection.
boolean	retainAll(LongCollection c) Retains in this collection only elements from the given type-specific collection.
int	size()
Object[]	toArray()
long[]	toLongArray() Returns a primitive type array containing the items of this collection.
long[]	toLongArray(long[] a) Returns a primitive type array containing the items of this collection.

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

add, addAll, contains, containsAll, isEmpty, longIterator, rem, remove, removeAll, retainAll, toArray, toArray, toString

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Method Detail

add

public boolean add(long k)

Specified by:

add in interface LongCollection

Overrides:

add in class AbstractLongCollection

See Also:

Collection.add(Object)

contains

public boolean contains(long k)

See Also:

Collection.contains(Object)

toArray

public Object[] toArray()

Specified by:

toArray in interface Collection<Long>

Overrides:

toArray in class AbstractLongCollection

toLongArray

public long[] toLongArray(long[] a)

Description copied from interface: LongCollection

Returns a primitive type array containing the items of this collection.

Note that, contrarily to Collection.toArray(Object[]), this methods just writes all elements of this collection: no special value will be added after the last one.

Specified by:

toLongArray in interface LongCollection

Overrides:

toLongArray in class AbstractLongCollection

Parameters:

a - if this array is big enough, it will be used to store this collection.

Returns:

a primitive type array containing the items of this collection.

See Also:

Collection.toArray(Object[])

toLongArray

public long[] toLongArray()

Description copied from interface: LongCollection

Returns a primitive type array containing the items of this collection.

Specified by:

toLongArray in interface LongCollection

Overrides:

toLongArray in class AbstractLongCollection

Returns:

a primitive type array containing the items of this collection.

See Also:

Collection.toArray()

rem

public boolean rem(long k)

Description copied from interface: LongCollection

Note that this method should be called remove(), but the clash with the similarly named index-based method in the List interface forces us to use a distinguished name. For simplicity, the set interfaces reinstates remove().

Specified by:

rem in interface LongCollection

Overrides:

rem in class AbstractLongCollection

See Also:

Collection.remove(Object)

addAll

public boolean addAll(LongCollection c)

Description copied from class: AbstractLongCollection

Adds all elements of the given type-specific collection to this collection.

Specified by:

addAll in interface LongCollection

Overrides:

addAll in class AbstractLongCollection

Parameters:

c - a type-specific collection.

Returns:

true if this collection changed as a result of the call.

See Also:

Collection.addAll(Collection)

removeAll

public boolean removeAll(LongCollection c)

Description copied from class: AbstractLongCollection

Remove from this collection all elements in the given type-specific collection.

Specified by:

removeAll in interface LongCollection

Overrides:

removeAll in class AbstractLongCollection

Parameters:

c - a type-specific collection.

Returns:

true if this collection changed as a result of the call.

See Also:

Collection.removeAll(Collection)

retainAll

public boolean retainAll(LongCollection c)

Description copied from class: AbstractLongCollection

Retains in this collection only elements from the given type-specific collection.

Specified by:

retainAll in interface LongCollection

Overrides:

retainAll in class AbstractLongCollection

Parameters:

c - a type-specific collection.

Returns:

true if this collection changed as a result of the call.

See Also:

Collection.retainAll(Collection)

containsAll

public boolean containsAll(LongCollection c)

Description copied from class: AbstractLongCollection

Checks whether this collection contains all elements from the given type-specific collection.

Specified by:

containsAll in interface LongCollection

Overrides:

containsAll in class AbstractLongCollection

Parameters:

c - a type-specific collection.

Returns:

true if this collection contains all elements of the argument.

See Also:

Collection.containsAll(Collection)

iterator

public LongListIterator 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 LongCollection

Specified by:

iterator in interface LongIterable

Specified by:

iterator in interface Iterable<Long>

Specified by:

iterator in interface Collection<Long>

Specified by:

iterator in class AbstractLongCollection

Returns:

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

size

public int size()

clear

public void clear()

Specified by:

clear in interface Collection<Long>

Overrides:

clear in class AbstractLongCollection

hashCode

public int hashCode()

Specified by:

hashCode in interface Collection<Long>

Overrides:

hashCode in class Object

equals

public boolean equals(Object o)

Specified by:

equals in interface Collection<Long>

Overrides:

equals in class Object