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java.util.stream

pack-priv abstract Class AbstractSpinedBuffer

Class Inheritance

extends Object

java.lang.Object
java.util.stream.AbstractSpinedBuffer

Known Direct Subclasses

java.util.stream.SpinedBuffer, java.util.stream.SpinedBuffer.OfPrimitive

Base class for a data structure for gathering elements into a buffer and then iterating them. Maintains an array of increasingly sized arrays, so there is no copying cost associated with growing the data structure.

Since: 1.8

Field Summary

Modifier and Type	Field and Description
protected int	elementIndex Index of the next element to write; may point into, or just outside of, the current chunk.
protected final int	initialChunkPower log2 of the size of the first chunk.
public static final int	MAX_CHUNK_POWER Max power-of-two for chunks.
public static final int	MIN_CHUNK_POWER Minimum power-of-two for the first chunk.
public static final int	MIN_CHUNK_SIZE Minimum size for the first chunk.
public static final int	MIN_SPINE_SIZE Minimum array size for array-of-chunks.
protected long[]	priorElementCount Count of elements in all prior chunks.
protected int	spineIndex Index of the current chunk in the spine array, if the spine array is non-null.

Constructor Summary

Access	Constructor and Description
protected	AbstractSpinedBuffer() Construct with an initial capacity of 16.
protected	AbstractSpinedBuffer(int The minimum expected number of elements initialCapacity) Construct with a specified initial capacity.

Method Summary

Modifier and Type	Method and Description
protected int	chunkSize(int n) How big should the nth chunk be?
public abstract void	clear() Remove all data from the buffer
public long	count() How many elements are currently in the buffer?
public boolean	isEmpty() Is the buffer currently empty?

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

Field Detail

elementIndex	back to summary
protected int elementIndex Index of the next element to write; may point into, or just outside of, the current chunk.

initialChunkPower	back to summary
protected final int initialChunkPower log2 of the size of the first chunk.

MAX_CHUNK_POWER	back to summary
public static final int MAX_CHUNK_POWER Max power-of-two for chunks.

MIN_CHUNK_POWER	back to summary
public static final int MIN_CHUNK_POWER Minimum power-of-two for the first chunk.

MIN_CHUNK_SIZE	back to summary
public static final int MIN_CHUNK_SIZE Minimum size for the first chunk.

MIN_SPINE_SIZE	back to summary
public static final int MIN_SPINE_SIZE Minimum array size for array-of-chunks.

priorElementCount	back to summary
protected long[] priorElementCount Count of elements in all prior chunks.

spineIndex	back to summary
protected int spineIndex Index of the current chunk in the spine array, if the spine array is non-null.

Constructor Detail

AbstractSpinedBuffer	back to summary
protected AbstractSpinedBuffer() Construct with an initial capacity of 16.

AbstractSpinedBuffer

back to summary

protected AbstractSpinedBuffer(int initialCapacity)

Construct with a specified initial capacity.

Parameters

initialCapacity:int: The minimum expected number of elements

Method Detail

chunkSize	back to summary
protected int chunkSize(int n) How big should the nth chunk be?

clear	back to summary
public abstract void clear() Remove all data from the buffer

count	back to summary
public long count() How many elements are currently in the buffer?

isEmpty	back to summary
public boolean isEmpty() Is the buffer currently empty?