org.apache.flink.util

Interface CloseableIterator<T>

Type Parameters:

T - the type of iterated elements.

All Superinterfaces:

AutoCloseable, Iterator<T>

All Known Implementing Classes:

CloseableIterator.IteratorAdapter, CollectResultIterator, FileBasedBufferIterator, MultiStateKeyIterator

@PublicEvolving
public interface CloseableIterator<T>
extends Iterator<T>, AutoCloseable

This interface represents an Iterator that is also AutoCloseable. A typical use-case for this interface are iterators that are based on native-resources such as files, network, or database connections. Clients must call AutoCloseable.close() after using the iterator.

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	CloseableIterator.IteratorAdapter<E> Adapter from Iterator to CloseableIterator.

Field Summary

Fields

Modifier and Type	Field and Description
static CloseableIterator<?>	EMPTY_INSTANCE

Method Summary

Modifier and Type	Method and Description
static <T> CloseableIterator<T>	adapterForIterator(Iterator<T> iterator)
static <T> CloseableIterator<T>	adapterForIterator(Iterator<T> iterator, AutoCloseable close)
static <T> CloseableIterator<T>	empty()
static <T> CloseableIterator<T>	flatten(CloseableIterator<T>... iterators)
static <T> CloseableIterator<T>	fromList(List<T> list, java.util.function.Consumer<T> closeNotConsumed)
static <E> CloseableIterator<E>	ofElement(E element, java.util.function.Consumer<E> closeIfNotConsumed)
static <T> CloseableIterator<T>	ofElements(java.util.function.Consumer<T> closeNotConsumed, T... elements)

Methods inherited from interface java.util.Iterator

forEachRemaining, hasNext, next, remove

Methods inherited from interface java.lang.AutoCloseable

close

Field Detail

EMPTY_INSTANCE

static final CloseableIterator<?> EMPTY_INSTANCE

Method Detail

adapterForIterator

@Nonnull
static <T> CloseableIterator<T> adapterForIterator(@Nonnull
                                                            Iterator<T> iterator)

adapterForIterator

static <T> CloseableIterator<T> adapterForIterator(@Nonnull
                                                   Iterator<T> iterator,
                                                   AutoCloseable close)

fromList

static <T> CloseableIterator<T> fromList(List<T> list,
                                         java.util.function.Consumer<T> closeNotConsumed)

flatten

static <T> CloseableIterator<T> flatten(CloseableIterator<T>... iterators)

empty

static <T> CloseableIterator<T> empty()

ofElements

static <T> CloseableIterator<T> ofElements(java.util.function.Consumer<T> closeNotConsumed,
                                           T... elements)

ofElement

static <E> CloseableIterator<E> ofElement(E element,
                                          java.util.function.Consumer<E> closeIfNotConsumed)