Package org.geotools.util

Class LazySet<E>

Object

AbstractCollection<E>

AbstractSet<E>

LazySet<E>

All Implemented Interfaces:

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

public final class LazySet<E>
extends AbstractSet<E>

An immutable set built from an iterator, which will be filled only when needed. This implementation do not check if all elements in the iterator are really unique; we assume that it was already verified by ServiceRegistry. This set is constructed by org.geotools.referencing.FactoryFinder.

Since:

2.0

Author:

Martin Desruisseaux (IRD)

Constructor Summary

Constructors

Constructor	Description
LazySet(Iterator<? extends E> iterator)	Construct a set to be filled using the specified iterator.
LazySet(Stream<? extends E> stream)	Construct a set to be filled using the specified iterator.

Method Summary

Modifier and Type	Method	Description
E	get(int index)	Returns the element at the specified position in this set.
boolean	isEmpty()	Tests if this set has no elements.
Iterator<E>	iterator()	Returns an iterator over the elements contained in this set.
int	size()	Returns the number of elements in this set.

Methods inherited from class AbstractSet

equals, hashCode, removeAll

Methods inherited from class AbstractCollection

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

Methods inherited from class Object

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

Methods inherited from interface Collection

parallelStream, removeIf, stream, toArray

Methods inherited from interface Iterable

forEach

Methods inherited from interface Set

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

Constructor Detail

LazySet

public LazySet(Iterator<? extends E> iterator)

Construct a set to be filled using the specified iterator. Iteration in the given iterator will occurs only when needed.

LazySet

public LazySet(Stream<? extends E> stream)

Construct a set to be filled using the specified iterator. Iteration in the given iterator will occurs only when needed.

Method Detail

iterator

public Iterator<E> iterator()

Returns an iterator over the elements contained in this set. This is not the same iterator than the one given to the constructor.

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()

Returns the number of elements in this set. Invoking this method force the set to immediately iterates through all remaining elements.

Specified by:

size in interface Collection<E>

Specified by:

size in interface Set<E>

Specified by:

size in class AbstractCollection<E>

isEmpty

public boolean isEmpty()

Tests if this set has no elements.

Specified by:

isEmpty in interface Collection<E>

Specified by:

isEmpty in interface Set<E>

Overrides:

isEmpty in class AbstractCollection<E>

get

public E get(int index)

Returns the element at the specified position in this set.