org.calrissian.mango.collect

Class CloseableIterables

java.lang.Object

org.calrissian.mango.collect.CloseableIterables

public class CloseableIterables
extends Object

Utility class to develop commonly used closeable iterables functions.

Constructor Summary

Constructors

Constructor and Description
CloseableIterables()

Method Summary

Methods

Modifier and Type	Method and Description
static <T> CloseableIterable<T>	autoClose(CloseableIterable<? extends T> iterable) Autoclose the iterator when exhausted or if an exception is thrown.
static <T> CloseableIterable<T>	chain(CloseableIterable<? extends T>... iterables) Combines multiple closeable iterables into a single closeable iterable.
static <T> CloseableIterable<T>	chain(Iterable<? extends CloseableIterable<? extends T>> iterables) Combines multiple closeable iterables into a single closeable iterable.
static <T> CloseableIterable<T>	concat(CloseableIterable<? extends Iterable<? extends T>> inputs) Combines multiple iterables into a single closeable iterable.
static <T> CloseableIterable<T>	distinct(CloseableIterable<T> iterable) If we can assume the closeable iterable is sorted, return the distinct elements.
static <T> CloseableIterable<T>	filter(CloseableIterable<T> iterable, Predicate<? super T> filter) Returns the elements of unfiltered that satisfy a predicate.
static <T> CloseableIterable<T>	limit(CloseableIterable<T> iterable, int limitSize) Creates a closeable iterable with the first limitSize elements of the given closeable iterable.
static <F,T> CloseableIterable<T>	transform(CloseableIterable<F> iterable, Function<? super F,? extends T> function) Returns an iterable that applies function to each element of fromIterable.
static <T> CloseableIterable<T>	wrap(Iterable<T> iterable) Creates a CloseableIterable from a standard iterable

Methods inherited from class java.lang.Object

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

Constructor Detail

CloseableIterables

public CloseableIterables()

Method Detail

transform

public static <F,T> CloseableIterable<T> transform(CloseableIterable<F> iterable,
                                   Function<? super F,? extends T> function)

Returns an iterable that applies function to each element of fromIterable.

limit

public static <T> CloseableIterable<T> limit(CloseableIterable<T> iterable,
                             int limitSize)

Creates a closeable iterable with the first limitSize elements of the given closeable iterable. If the original closeable iterable does not contain that many elements, the returned iterator will have the same behavior as the original closeable iterable. The returned closeable iterable's iterator supports remove() if the original iterator does.

filter

public static <T> CloseableIterable<T> filter(CloseableIterable<T> iterable,
                              Predicate<? super T> filter)

Returns the elements of unfiltered that satisfy a predicate. The resulting closeable iterable's iterator does not support remove().

concat

public static <T> CloseableIterable<T> concat(CloseableIterable<? extends Iterable<? extends T>> inputs)

Combines multiple iterables into a single closeable iterable. The returned closeable iterable has an iterator that traverses the elements of each iterable in inputs. The input iterators are not polled until necessary.

chain

public static <T> CloseableIterable<T> chain(CloseableIterable<? extends T>... iterables)

Combines multiple closeable iterables into a single closeable iterable. The returned closeable iterable has an iterator that traverses the elements of each iterable in inputs. The input iterators are not polled until necessary.

chain

public static <T> CloseableIterable<T> chain(Iterable<? extends CloseableIterable<? extends T>> iterables)

Combines multiple closeable iterables into a single closeable iterable. The returned closeable iterable has an iterator that traverses the elements of each iterable in inputs. The input iterators are not polled until necessary.

distinct

public static <T> CloseableIterable<T> distinct(CloseableIterable<T> iterable)

If we can assume the closeable iterable is sorted, return the distinct elements. This only works if the data provided is sorted.

autoClose

public static <T> CloseableIterable<T> autoClose(CloseableIterable<? extends T> iterable)

Autoclose the iterator when exhausted or if an exception is thrown.

wrap

public static <T> CloseableIterable<T> wrap(Iterable<T> iterable)

Creates a CloseableIterable from a standard iterable