Package org.apache.poi.poifs.filesystem

Class POIFSMiniStore

java.lang.Object

org.apache.poi.poifs.filesystem.BlockStore

org.apache.poi.poifs.filesystem.POIFSMiniStore

public class POIFSMiniStore
extends BlockStore

This class handles the MiniStream (small block store) in the NIO case for POIFSFileSystem

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.poi.poifs.filesystem.BlockStore

BlockStore.ChainLoopDetector

Method Summary

Modifier and Type	Method	Description
protected ByteBuffer	createBlockIfNeeded(int offset)	Load the block, extending the underlying stream if needed
protected BATBlock.BATBlockAndIndex	getBATBlockAndIndex(int offset)	Returns the BATBlock that handles the specified offset, and the relative index within it
protected ByteBuffer	getBlockAt(int offset)	Load the block at the given offset.
protected int	getBlockStoreBlockSize()	Returns the size of the blocks managed through the block store.
protected BlockStore.ChainLoopDetector	getChainLoopDetector()	Creates a Detector for loops in the chain
protected int	getFreeBlock()	Finds a free block, and returns its offset.
protected int	getNextBlock(int offset)	Works out what block follows the specified one.
protected void	releaseBuffer(ByteBuffer buffer)	Releases a mmap-ed buffer, which you are sure won't be used again
protected void	setNextBlock(int offset, int nextBlock)	Changes the record of what block follows the specified one.

Methods inherited from class java.lang.Object

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

Method Detail

getBlockAt

protected ByteBuffer getBlockAt(int offset)
                         throws IOException

Load the block at the given offset.

Specified by:

getBlockAt in class BlockStore

Throws:

IOException

createBlockIfNeeded

protected ByteBuffer createBlockIfNeeded(int offset)
                                  throws IOException

Load the block, extending the underlying stream if needed

Specified by:

createBlockIfNeeded in class BlockStore

Throws:

IOException

getBATBlockAndIndex

protected BATBlock.BATBlockAndIndex getBATBlockAndIndex(int offset)

Returns the BATBlock that handles the specified offset, and the relative index within it

Specified by:

getBATBlockAndIndex in class BlockStore

getNextBlock

protected int getNextBlock(int offset)

Works out what block follows the specified one.

Specified by:

getNextBlock in class BlockStore

setNextBlock

protected void setNextBlock(int offset,
                            int nextBlock)

Changes the record of what block follows the specified one.

Specified by:

setNextBlock in class BlockStore

getFreeBlock

protected int getFreeBlock()
                    throws IOException

Finds a free block, and returns its offset. This method will extend the file if needed, and if doing so, allocate new FAT blocks to address the extra space.

Specified by:

getFreeBlock in class BlockStore

Throws:

IOException

getChainLoopDetector

protected BlockStore.ChainLoopDetector getChainLoopDetector()

Description copied from class: BlockStore

Creates a Detector for loops in the chain

Specified by:

getChainLoopDetector in class BlockStore

getBlockStoreBlockSize

protected int getBlockStoreBlockSize()

Description copied from class: BlockStore

Returns the size of the blocks managed through the block store.

Specified by:

getBlockStoreBlockSize in class BlockStore

releaseBuffer

protected void releaseBuffer(ByteBuffer buffer)

Description copied from class: BlockStore

Releases a mmap-ed buffer, which you are sure won't be used again

Specified by:

releaseBuffer in class BlockStore

Parameters:

buffer - the buffer