it.unimi.dsi.fastutil.doubles

Class DoubleCollections.EmptyCollection

java.lang.Object

java.util.AbstractCollection<Double>

it.unimi.dsi.fastutil.doubles.AbstractDoubleCollection

it.unimi.dsi.fastutil.doubles.DoubleCollections.EmptyCollection

All Implemented Interfaces:

DoubleCollection, DoubleIterable, Iterable<Double>, Collection<Double>

Direct Known Subclasses:

DoubleBigLists.EmptyBigList, DoubleLists.EmptyList, DoubleSets.EmptySet

Enclosing class:

DoubleCollections

public abstract static class DoubleCollections.EmptyCollection
extends AbstractDoubleCollection

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.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	DoubleCollections.EmptyCollection()

Method Summary

Methods

Modifier and Type	Method and Description
boolean	add(double k)
boolean	addAll(DoubleCollection c) Adds all elements of the given type-specific collection to this collection.
void	clear()
boolean	contains(double k)
boolean	containsAll(DoubleCollection c) Checks whether this collection contains all elements from the given type-specific collection.
boolean	equals(Object o)
int	hashCode()
DoubleBidirectionalIterator	iterator() Returns a type-specific iterator on the elements of this collection.
boolean	rem(double 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(DoubleCollection c) Remove from this collection all elements in the given type-specific collection.
boolean	retainAll(DoubleCollection c) Retains in this collection only elements from the given type-specific collection.
int	size()
Object[]	toArray()
double[]	toDoubleArray() Returns a primitive type array containing the items of this collection.
double[]	toDoubleArray(double[] a) Returns a primitive type array containing the items of this collection.

Methods inherited from class it.unimi.dsi.fastutil.doubles.AbstractDoubleCollection

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

Methods inherited from class java.lang.Object

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

Constructor Detail

DoubleCollections.EmptyCollection

protected DoubleCollections.EmptyCollection()

Method Detail

add

public boolean add(double k)

Specified by:

add in interface DoubleCollection

Overrides:

add in class AbstractDoubleCollection

See Also:

Collection.add(Object)

contains

public boolean contains(double k)

Specified by:

contains in interface DoubleCollection

Overrides:

contains in class AbstractDoubleCollection

See Also:

Collection.contains(Object)

toArray

public Object[] toArray()

Specified by:

toArray in interface Collection<Double>

Overrides:

toArray in class AbstractDoubleCollection

toDoubleArray

public double[] toDoubleArray(double[] a)

Description copied from interface: DoubleCollection

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:

toDoubleArray in interface DoubleCollection

Overrides:

toDoubleArray in class AbstractDoubleCollection

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[])

toDoubleArray

public double[] toDoubleArray()

Description copied from interface: DoubleCollection

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

Specified by:

toDoubleArray in interface DoubleCollection

Overrides:

toDoubleArray in class AbstractDoubleCollection

Returns:

a primitive type array containing the items of this collection.

See Also:

Collection.toArray()

rem

public boolean rem(double k)

Description copied from interface: DoubleCollection

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 DoubleCollection

Overrides:

rem in class AbstractDoubleCollection

See Also:

Collection.remove(Object)

addAll

public boolean addAll(DoubleCollection c)

Description copied from class: AbstractDoubleCollection

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

Specified by:

addAll in interface DoubleCollection

Overrides:

addAll in class AbstractDoubleCollection

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(DoubleCollection c)

Description copied from class: AbstractDoubleCollection

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

Specified by:

removeAll in interface DoubleCollection

Overrides:

removeAll in class AbstractDoubleCollection

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(DoubleCollection c)

Description copied from class: AbstractDoubleCollection

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

Specified by:

retainAll in interface DoubleCollection

Overrides:

retainAll in class AbstractDoubleCollection

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(DoubleCollection c)

Description copied from class: AbstractDoubleCollection

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

Specified by:

containsAll in interface DoubleCollection

Overrides:

containsAll in class AbstractDoubleCollection

Parameters:

c - a type-specific collection.

Returns:

true if this collection contains all elements of the argument.

See Also:

Collection.containsAll(Collection)

iterator

public DoubleBidirectionalIterator iterator()

Description copied from interface: DoubleCollection

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 DoubleCollection

Specified by:

iterator in interface DoubleIterable

Specified by:

iterator in interface Iterable<Double>

Specified by:

iterator in interface Collection<Double>

Specified by:

iterator in class AbstractDoubleCollection

Returns:

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

size

public int size()

Specified by:

size in interface Collection<Double>

Specified by:

size in class AbstractCollection<Double>

clear

public void clear()

Specified by:

clear in interface Collection<Double>

Overrides:

clear in class AbstractCollection<Double>

hashCode

public int hashCode()

Specified by:

hashCode in interface Collection<Double>

Overrides:

hashCode in class Object

equals

public boolean equals(Object o)

Specified by:

equals in interface Collection<Double>

Overrides:

equals in class Object