org.apache.poi.poifs.filesystem
Class NPOIFSMiniStore

java.lang.Object
  extended by org.apache.poi.poifs.filesystem.BlockStore
      extended by org.apache.poi.poifs.filesystem.NPOIFSMiniStore

public class NPOIFSMiniStore
extends BlockStore

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


Nested Class Summary
 
Nested classes/interfaces inherited from class org.apache.poi.poifs.filesystem.BlockStore
BlockStore.ChainLoopDetector
 
Constructor Summary
protected NPOIFSMiniStore(NPOIFSFileSystem filesystem, RootProperty root, java.util.List<BATBlock> sbats, HeaderBlock header)
           
 
Method Summary
protected  java.nio.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  java.nio.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 setNextBlock(int offset, int nextBlock)
          Changes the record of what block follows the specified one.
protected  void syncWithDataSource()
          Writes the SBATs to their backing blocks
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

NPOIFSMiniStore

protected NPOIFSMiniStore(NPOIFSFileSystem filesystem,
                          RootProperty root,
                          java.util.List<BATBlock> sbats,
                          HeaderBlock header)
Method Detail

getBlockAt

protected java.nio.ByteBuffer getBlockAt(int offset)
                                  throws java.io.IOException
Load the block at the given offset.

Specified by:
getBlockAt in class BlockStore
Throws:
java.io.IOException

createBlockIfNeeded

protected java.nio.ByteBuffer createBlockIfNeeded(int offset)
                                           throws java.io.IOException
Load the block, extending the underlying stream if needed

Specified by:
createBlockIfNeeded in class BlockStore
Throws:
java.io.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 java.io.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:
java.io.IOException

getChainLoopDetector

protected BlockStore.ChainLoopDetector getChainLoopDetector()
                                                     throws java.io.IOException
Description copied from class: BlockStore
Creates a Detector for loops in the chain

Specified by:
getChainLoopDetector in class BlockStore
Throws:
java.io.IOException

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

syncWithDataSource

protected void syncWithDataSource()
                           throws java.io.IOException
Writes the SBATs to their backing blocks

Throws:
java.io.IOException


Copyright 2012 The Apache Software Foundation or its licensors, as applicable.