com.healthmarketscience.jackcess.impl
Class TempBufferHolder

java.lang.Object
  com.healthmarketscience.jackcess.impl.TempBufferHolder

public abstract class TempBufferHolder
extends Object

Manages a reference to a ByteBuffer.

Author:

James Ahlborn

Nested Class Summary

static class

TempBufferHolder.Type The caching type for the buffer holder.

Constructor Summary

protected

TempBufferHolder(boolean autoRewind, ByteOrder order)

Method Summary

abstract void	clear() Releases any referenced memory.
ByteBuffer	getBuffer(PageChannel pageChannel, int size) Returns a ByteBuffer of at least the given size, with the limit set to the given size, and the predefined byteOrder.
abstract ByteBuffer	getExistingBuffer()
int	getModCount()
ByteBuffer	getPageBuffer(PageChannel pageChannel) Returns a ByteBuffer of at least the defined page size, with the limit set to the page size, and the predefined byteOrder.
static TempBufferHolder	newHolder(TempBufferHolder.Type type, boolean autoRewind) Creates a new TempBufferHolder.
static TempBufferHolder	newHolder(TempBufferHolder.Type type, boolean autoRewind, ByteOrder order) Creates a new TempBufferHolder.
protected abstract void	setNewBuffer(ByteBuffer newBuffer) Sets a new buffer for this holder.

Methods inherited from class java.lang.Object

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

Constructor Detail

TempBufferHolder

protected TempBufferHolder(boolean autoRewind,
                           ByteOrder order)

Method Detail

getModCount

public int getModCount()

Returns:

the modification count of the current buffer (this count is changed every time the buffer is reallocated)

newHolder

public static TempBufferHolder newHolder(TempBufferHolder.Type type,
                                         boolean autoRewind)

Creates a new TempBufferHolder.

Parameters:

type - the type of reference desired for any created buffer

autoRewind - whether or not every get automatically rewinds the buffer

newHolder

public static TempBufferHolder newHolder(TempBufferHolder.Type type,
                                         boolean autoRewind,
                                         ByteOrder order)

Creates a new TempBufferHolder.

Parameters:

type - the type of reference desired for any created buffer

autoRewind - whether or not every get automatically rewinds the buffer

order - byte order for all allocated buffers

getPageBuffer

public final ByteBuffer getPageBuffer(PageChannel pageChannel)

Returns a ByteBuffer of at least the defined page size, with the limit set to the page size, and the predefined byteOrder. Will be rewound iff autoRewind is enabled for this buffer.

getBuffer

public final ByteBuffer getBuffer(PageChannel pageChannel,
                                  int size)

Returns a ByteBuffer of at least the given size, with the limit set to the given size, and the predefined byteOrder. Will be rewound iff autoRewind is enabled for this buffer.

getExistingBuffer

public abstract ByteBuffer getExistingBuffer()

Returns:

the currently referenced buffer, null if none

clear

public abstract void clear()

Releases any referenced memory.

setNewBuffer

protected abstract void setNewBuffer(ByteBuffer newBuffer)

Sets a new buffer for this holder.