java.nio
Class DoubleArrayBuffer

java.lang.Object
  java.nio.Buffer
      java.nio.DoubleBuffer
          java.nio.DoubleArrayBuffer

All Implemented Interfaces:

Comparable<DoubleBuffer>

Direct Known Subclasses:

ReadOnlyDoubleArrayBuffer, ReadWriteDoubleArrayBuffer

abstract class DoubleArrayBuffer
extends DoubleBuffer

DoubleArrayBuffer, ReadWriteDoubleArrayBuffer and ReadOnlyDoubleArrayBuffer compose the implementation of array based double buffers.

DoubleArrayBuffer implements all the shared readonly methods and is extended by the other two classes.

All methods are marked final for runtime performance.

Field Summary

protected double[]	backingArray
protected int	offset

Fields inherited from class java.nio.Buffer

_elementSizeShift, capacity, limit, mark, position, UNSET_MARK

Constructor Summary

DoubleArrayBuffer(double[] array)

DoubleArrayBuffer(int capacity)

DoubleArrayBuffer(int capacity, double[] backingArray, int offset)

Method Summary

double	get() Returns the double at the current position and increase the position by 1.
DoubleBuffer	get(double[] dest, int off, int len) Reads doubles from the current position into the specified double array, starting from the specified offset, and increase the position by the number of doubles read.
double	get(int index) Returns a double at the specified index, and the position is not changed.
boolean	isDirect() Returns true if this buffer is direct.
ByteOrder	order() Returns the byte order used by this buffer when converting doubles from/to bytes.

Methods inherited from class java.nio.DoubleBuffer

_array, _arrayOffset, allocate, array, arrayOffset, asReadOnlyBuffer, compact, compareTo, duplicate, equals, get, hasArray, hashCode, protectedArray, protectedArrayOffset, protectedHasArray, put, put, put, put, put, slice, toString, wrap, wrap

Methods inherited from class java.nio.Buffer

capacity, clear, flip, hasRemaining, isReadOnly, limit, limit, mark, position, position, remaining, reset, rewind

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

backingArray

protected final double[] backingArray

offset

protected final int offset

Constructor Detail

DoubleArrayBuffer

DoubleArrayBuffer(double[] array)

DoubleArrayBuffer

DoubleArrayBuffer(int capacity)

DoubleArrayBuffer

DoubleArrayBuffer(int capacity,
                  double[] backingArray,
                  int offset)

Method Detail

get

public final double get()

Description copied from class: DoubleBuffer

Returns the double at the current position and increase the position by 1.

Specified by:

get in class DoubleBuffer

Returns:

The double at the current position.

get

public final double get(int index)

Description copied from class: DoubleBuffer

Returns a double at the specified index, and the position is not changed.

Specified by:

get in class DoubleBuffer

Parameters:

index - The index, must be no less than zero and less than limit

Returns:

A double at the specified index.

get

public final DoubleBuffer get(double[] dest,
                              int off,
                              int len)

Description copied from class: DoubleBuffer

Reads doubles from the current position into the specified double array, starting from the specified offset, and increase the position by the number of doubles read.

Overrides:

get in class DoubleBuffer

Parameters:

dest - The target double array

off - The offset of the double array, must be no less than zero and no greater than dest.length

len - The number of doubles to read, must be no less than zero and no greater than dest.length - off

Returns:

This buffer

isDirect

public final boolean isDirect()

Description copied from class: DoubleBuffer

Returns true if this buffer is direct.

A direct buffer will try its best to take advantage of native memory APIs and it may not stay in java heap, thus not affected by GC.

A double buffer is direct, if it is based on a byte buffer and the byte buffer is direct.

Specified by:

isDirect in class DoubleBuffer

Returns:

True if this buffer is direct.

order

public final ByteOrder order()

Description copied from class: DoubleBuffer

Returns the byte order used by this buffer when converting doubles from/to bytes.

If this buffer is not based on a byte buffer, then always return the platform's native byte order.

Specified by:

order in class DoubleBuffer

Returns:

The byte order used by this buffer when converting doubles from/to bytes.