Top Description Fields Constructors Methods
org.assertj.core.presentation

pack-priv final Class HeadTailAccumulator<T>

extends Object
Class Inheritance
Static Imports
org.assertj.core.util.Preconditions.checkArgument
Accumulates the values in a stream or iterable, keeping the first and last elements and discarding everything in between.

Field Summary

Modifier and TypeField and Description
private final Queue<T>
head

The first elements seen.

private final Queue<T>
tail

The elements seen most recently, excluding anything already on head.

Constructor Summary

AccessConstructor and Description
pack-priv
HeadTailAccumulator(int
the maximum number of elements to retain from the start of the stream
headCapacity, int
the maximum number of elements to retain from the end of the stream.
tailCapacity)

Creates a new HeadTailAccumulator.

Method Summary

Modifier and TypeMethod and Description
pack-priv void
add(final T
the element to add (may be null)
element)

Adds an element to the accumulator, possibly displacing an older element.

pack-priv Stream<T>

Returns:

the head and tail concatenated
stream()

Converts the accumulated elements into a stream.

Inherited from java.lang.Object:
cloneequalsfinalizegetClasshashCodenotifynotifyAlltoStringwaitwaitwait

Field Detail

tailback to summary
private final Queue<T> tail

The elements seen most recently, excluding anything already on head.

Constructor Detail

HeadTailAccumulatorback to summary
pack-priv HeadTailAccumulator(int headCapacity, int tailCapacity)

Creates a new HeadTailAccumulator.

Parameters
headCapacity:int

the maximum number of elements to retain from the start of the stream

tailCapacity:int

the maximum number of elements to retain from the end of the stream.

Exceptions
IllegalArgumentException:
if either argument is negative

Method Detail

addback to summary
pack-priv void add(final T element)

Adds an element to the accumulator, possibly displacing an older element.

Parameters
element:T

the element to add (may be null)

streamback to summary
pack-priv Stream<T> stream()

Converts the accumulated elements into a stream.

Returns:Stream<T>

the head and tail concatenated