Package org.apache.commons.collections4

Class SetUtils.SetView<E>

java.lang.Object

java.util.AbstractCollection<E>

java.util.AbstractSet<E>

org.apache.commons.collections4.SetUtils.SetView<E>

Type Parameters:

E - the element type

All Implemented Interfaces:

Iterable<E>, Collection<E>, Set<E>

Enclosing class:

SetUtils

public abstract static class SetUtils.SetView<E>
extends AbstractSet<E>

An unmodifiable view of a set that may be backed by other sets.

If the decorated sets change, this view will change as well. The contents of this view can be transferred to another instance via the copyInto(Set) and toSet() methods.

Since:

4.1

Constructor Summary

Constructors

Constructor	Description
SetView()

Method Summary

Modifier and Type	Method	Description
<S extends Set<E>> void	copyInto(S set)	Copies the contents of this view into the provided set.
protected abstract Iterator<E>	createIterator()	Return an iterator for this view; the returned iterator is not required to be unmodifiable.
Iterator<E>	iterator()
int	size()
Set<E>	toSet()	Returns a new set containing the contents of this view.

Methods inherited from class java.util.AbstractSet

equals, hashCode, removeAll

Methods inherited from class java.util.AbstractCollection

add, addAll, clear, contains, containsAll, isEmpty, remove, retainAll, toArray, toArray, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Collection

parallelStream, removeIf, stream

Methods inherited from interface java.lang.Iterable

forEach

Methods inherited from interface java.util.Set

add, addAll, clear, contains, containsAll, isEmpty, remove, retainAll, spliterator, toArray, toArray

Constructor Details

SetView

public SetView()

Method Details

copyInto

public <S extends Set<E>> void copyInto(S set)

Copies the contents of this view into the provided set.

Type Parameters:

S - the set type

Parameters:

set - the set for copying the contents

createIterator

protected abstract Iterator<E> createIterator()

Return an iterator for this view; the returned iterator is not required to be unmodifiable.

Returns:

a new iterator for this view

iterator

public Iterator<E> iterator()

Specified by:

iterator in interface Collection<E>

Specified by:

iterator in interface Iterable<E>

Specified by:

iterator in interface Set<E>

Specified by:

iterator in class AbstractCollection<E>

size

public int size()

Specified by:

size in interface Collection<E>

Specified by:

size in interface Set<E>

Specified by:

size in class AbstractCollection<E>

toSet

public Set<E> toSet()

Returns a new set containing the contents of this view.

Returns:

a new set containing all elements of this view