alluxio.resource

Class CloseableIterator<T>

java.lang.Object

alluxio.resource.CloseableResource<Iterator<T>>

alluxio.resource.CloseableIterator<T>

Type Parameters:

T - the type of elements returned by the iterator

All Implemented Interfaces:

Closeable, AutoCloseable

public abstract class CloseableIterator<T>
extends CloseableResource<Iterator<T>>

A CloseableIterator<T> is an iterator which requires cleanup when it is no longer in use.

Constructor Summary

Constructors

Constructor and Description
CloseableIterator(Iterator<T> iterator) Creates a CloseableIterator wrapper around the given iterator.

Method Summary

Modifier and Type	Method and Description
static <T> CloseableIterator<T>	concat(CloseableIterator<T> a, CloseableIterator<T> b) Combines two iterators into a single iterator.
static <T> CloseableIterator<T>	concat(List<CloseableIterator<T>> iterators) Concatenate iterators.
static <T> CloseableIterator<T>	noopCloseable(Iterator<? extends T> iterator) Wrap around an iterator with no resource to close.

Methods inherited from class alluxio.resource.CloseableResource

close, get

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

CloseableIterator

public CloseableIterator(Iterator<T> iterator)

Creates a CloseableIterator wrapper around the given iterator. This iterator will be returned by the CloseableResource.get() method.

Parameters:

iterator - the resource to wrap

Method Detail

noopCloseable

public static <T> CloseableIterator<T> noopCloseable(Iterator<? extends T> iterator)

Wrap around an iterator with no resource to close.

Type Parameters:

T - the type of the iterable

Parameters:

iterator - the iterator to wrap around

Returns:

the closeable iterator

concat

public static <T> CloseableIterator<T> concat(CloseableIterator<T> a,
                                              CloseableIterator<T> b)

Combines two iterators into a single iterator.

Type Parameters:

T - type of iterator

Parameters:

a - an iterator

b - another iterator

Returns:

the concatenated iterator

concat

public static <T> CloseableIterator<T> concat(List<CloseableIterator<T>> iterators)

Concatenate iterators.

Type Parameters:

T - type of iterator

Parameters:

iterators - a list of iterators

Returns:

a concatenated iterator that iterate over all elements from each of the child iterators