org.apache.poi.poifs.storage
Class DocumentBlock

java.lang.Object
  org.apache.poi.poifs.storage.DocumentBlock

All Implemented Interfaces:

BlockWritable

public final class DocumentBlock
extends java.lang.Object

A block of document data.

Author:

Marc Johnson (mjohnson at apache dot org)

Field Summary

protected POIFSBigBlockSize

bigBlockSize Either 512 bytes (POIFSConstants.SMALLER_BIG_BLOCK_SIZE) or 4096 bytes (POIFSConstants.LARGER_BIG_BLOCK_SIZE)

Constructor Summary

DocumentBlock(java.io.InputStream stream, POIFSBigBlockSize bigBlockSize)
Create a single instance initialized with data.

DocumentBlock(RawDataBlock block)
create a document block from a raw data block

Method Summary

static DocumentBlock[]	convert(POIFSBigBlockSize bigBlockSize, byte[] array, int size) convert a single long array into an array of DocumentBlock instances
protected void	doWriteData(java.io.OutputStream stream, byte[] data) Default implementation of write for extending classes that contain their data in a simple array of bytes.
static DataInputBlock	getDataInputBlock(DocumentBlock[] blocks, int offset)
static byte	getFillByte()
boolean	partiallyRead() Was this a partially read block?
int	size() Get the number of bytes read for this block
void	writeBlocks(java.io.OutputStream stream) Write the storage to an OutputStream

Methods inherited from class java.lang.Object

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

Field Detail

bigBlockSize

protected POIFSBigBlockSize bigBlockSize

Either 512 bytes (POIFSConstants.SMALLER_BIG_BLOCK_SIZE) or 4096 bytes (POIFSConstants.LARGER_BIG_BLOCK_SIZE)

Constructor Detail

DocumentBlock

public DocumentBlock(RawDataBlock block)
              throws java.io.IOException

create a document block from a raw data block

Parameters:

block - the raw data block

Throws:

java.io.IOException

DocumentBlock

public DocumentBlock(java.io.InputStream stream,
                     POIFSBigBlockSize bigBlockSize)
              throws java.io.IOException

Create a single instance initialized with data.

Parameters:

stream - the InputStream delivering the data.

Throws:

java.io.IOException

Method Detail

size

public int size()

Get the number of bytes read for this block

Returns:

bytes read into the block

partiallyRead

public boolean partiallyRead()

Was this a partially read block?

Returns:

true if the block was only partially filled with data

getFillByte

public static byte getFillByte()

Returns:

the fill byte used

convert

public static DocumentBlock[] convert(POIFSBigBlockSize bigBlockSize,
                                      byte[] array,
                                      int size)

convert a single long array into an array of DocumentBlock instances

Parameters:

array - the byte array to be converted

size - the intended size of the array (which may be smaller)

Returns:

an array of DocumentBlock instances, filled from the input array

getDataInputBlock

public static DataInputBlock getDataInputBlock(DocumentBlock[] blocks,
                                               int offset)

doWriteData

protected void doWriteData(java.io.OutputStream stream,
                           byte[] data)
                    throws java.io.IOException

Default implementation of write for extending classes that contain their data in a simple array of bytes.

Parameters:

stream - the OutputStream to which the data should be written.

data - the byte array of to be written.

Throws:

java.io.IOException - on problems writing to the specified stream.

writeBlocks

public void writeBlocks(java.io.OutputStream stream)
                 throws java.io.IOException

Write the storage to an OutputStream

Specified by:

writeBlocks in interface BlockWritable

Parameters:

stream - the OutputStream to which the stored data should be written

Throws:

java.io.IOException - on problems writing to the specified stream