Package org.apache.poi.poifs.filesystem

Class POIFSMiniStore

  • public class POIFSMiniStore
extends BlockStore
    This class handles the MiniStream (small block store) in the NIO case for POIFSFileSystem

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      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 releaseBuffer​(java.nio.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 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

      • 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

      • 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​(java.nio.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