Package org.infinispan.commons.util

Class Closeables

java.lang.Object

org.infinispan.commons.util.Closeables

public class Closeables
extends Object

This class consists exclusively of static methods that operate on or return closeable interfaces. This is helpful when wanting to change a given interface to an appropriate closeable interface.

Since:

8.0

Method Summary

Modifier and Type	Method	Description
static <E> CloseableIterator<E>	iterator(Iterator<? extends E> iterator)	Creates a closeable iterator from the given iterator that does nothing when close is called.
static <R> CloseableIterator<R>	iterator(BaseStream<R,Stream<R>> stream)	Creates a closeable iterator that when closed will close the underlying stream as well
static <E> CloseableIterator<E>	iterator(org.reactivestreams.Publisher<E> publisher, int fetchSize)	Converts a Publisher to a CloseableIterator by utilizing items fetched into an array and refetched as they are consumed from the iterator.
static <T> CloseableSpliterator<T>	spliterator(Spliterator<T> spliterator)	Creates a closeable spliterator from the given spliterator that does nothing when close is called.
static <R> CloseableSpliterator<R>	spliterator(BaseStream<R,Stream<R>> stream)	Creates a closeable spliterator that when closed will close the underlying stream as well
static <E> CloseableSpliterator<E>	spliterator(CloseableIterator<? extends E> iterator, long size, int characteristics)	Takes a provided closeable iterator and wraps it appropriately so it can be used as a closeable spliterator that will close the iterator when the spliterator is closed.
static <E> Stream<E>	stream(CloseableIterator<E> iterator, boolean parallel, long size, int characteristics)	Creates a stream that when closed will also close the underlying iterator
static <E> Stream<E>	stream(CloseableSpliterator<E> spliterator, boolean parallel)	Creates a stream that when closed will also close the underlying spliterator

Method Detail

spliterator

public static <E> CloseableSpliterator<E> spliterator(CloseableIterator<? extends E> iterator,
                                                      long size,
                                                      int characteristics)

Takes a provided closeable iterator and wraps it appropriately so it can be used as a closeable spliterator that will close the iterator when the spliterator is closed.

Type Parameters:

E - The type that is the same between the iterator and spliterator

Parameters:

iterator - The closeable iterator to change to a spliterator

size - The approximate size of the iterator. If no size is known Long.MAX_VALUE should be passed

characteristics - The characteristics of the given spliterator as defined on the Spliterator interface

Returns:

A spliterator that when closed will close the provided iterator

spliterator

public static <T> CloseableSpliterator<T> spliterator(Spliterator<T> spliterator)

Creates a closeable spliterator from the given spliterator that does nothing when close is called.

Type Parameters:

T - The type of the spliterators

Parameters:

spliterator - The spliterator to wrap to allow it to become a closeable spliterator.

Returns:

A spliterator that does nothing when closed

spliterator

public static <R> CloseableSpliterator<R> spliterator(BaseStream<R,Stream<R>> stream)

Creates a closeable spliterator that when closed will close the underlying stream as well

Type Parameters:

R - The type of the stream

Parameters:

stream - The stream to change into a closeable spliterator

Returns:

A spliterator that when closed will also close the underlying stream

iterator

public static <R> CloseableIterator<R> iterator(BaseStream<R,Stream<R>> stream)

Creates a closeable iterator that when closed will close the underlying stream as well

Type Parameters:

R - The type of the stream

Parameters:

stream - The stream to change into a closeable iterator

Returns:

An iterator that when closed will also close the underlying stream

iterator

public static <E> CloseableIterator<E> iterator(Iterator<? extends E> iterator)

Creates a closeable iterator from the given iterator that does nothing when close is called.

Type Parameters:

E - The type of the iterators

Parameters:

iterator - The iterator to wrap to allow it to become a closeable iterator

Returns:

An iterator that does nothing when closed

stream

public static <E> Stream<E> stream(CloseableSpliterator<E> spliterator,
                                   boolean parallel)

Creates a stream that when closed will also close the underlying spliterator

Type Parameters:

E - the type of the stream

Parameters:

spliterator - spliterator to back the stream and subsequently close

parallel - whether or not the returned stream is parallel or not

Returns:

the stream to use

stream

public static <E> Stream<E> stream(CloseableIterator<E> iterator,
                                   boolean parallel,
                                   long size,
                                   int characteristics)

Creates a stream that when closed will also close the underlying iterator

Type Parameters:

E - the type of the stream

Parameters:

iterator - iterator to back the stream and subsequently close

parallel - whether or not the returned stream is parallel or not

size - the size of the iterator if known, otherwise Long.MAX_VALUE should be passed.

characteristics - the characteristics of the iterator to be used

Returns:

the stream to use

iterator

public static <E> CloseableIterator<E> iterator(org.reactivestreams.Publisher<E> publisher,
                                                int fetchSize)

Converts a Publisher to a CloseableIterator by utilizing items fetched into an array and refetched as they are consumed from the iterator. The iterator when closed will also close the underlying Subscription when subscribed to the publisher.

Type Parameters:

E - value type

Parameters:

publisher - the publisher to convert

fetchSize - how many entries to hold in memory at once in preparation for the iterators consumption

Returns:

an iterator that when closed will cancel the subscription