Package loci.poi.poifs.storage

Class DocumentBlock

java.lang.Object

loci.poi.poifs.storage.DocumentBlock

All Implemented Interfaces:

BlockWritable

public class DocumentBlock
extends java.lang.Object

A block of document data.

Author:

Marc Johnson (mjohnson at apache dot org)

Constructor Summary

Constructors

Constructor	Description
DocumentBlock(loci.common.RandomAccessInputStream stream, int size)	Create a single instance initialized with data.
DocumentBlock(RawDataBlock block, int size)	create a document block from a raw data block

Method Summary

Modifier and Type	Method	Description
static DocumentBlock[]	convert(long offset, loci.common.RandomAccessInputStream stream, int numBytes, int size, int blockSize)	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.
int	getBigBlockSize()
static byte	getFillByte()
boolean	partiallyRead()	Was this a partially read block?
static void	read(DocumentBlock[] blocks, byte[] buffer, int offset, int blockSize, loci.common.RandomAccessInputStream stream)	read data from an array of DocumentBlocks
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

Constructor Detail

DocumentBlock

public DocumentBlock(RawDataBlock block,
                     int size)
              throws java.io.IOException

create a document block from a raw data block

Parameters:

block - the raw data block

size - the block size

Throws:

java.io.IOException

DocumentBlock

public DocumentBlock(loci.common.RandomAccessInputStream stream,
                     int size)
              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

getBigBlockSize

public int getBigBlockSize()

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(long offset,
                                      loci.common.RandomAccessInputStream stream,
                                      int numBytes,
                                      int size,
                                      int blockSize)

convert a single long array into an array of DocumentBlock instances

Parameters:

offset - the offset into the array of blocks to read from

stream - the RandomAccessInputStream to read from

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

numBytes - the number of bytes

blockSize - the size of a big block

Returns:

an array of DocumentBlock instances, filled from the input array

read

public static void read(DocumentBlock[] blocks,
                        byte[] buffer,
                        int offset,
                        int blockSize,
                        loci.common.RandomAccessInputStream stream)

read data from an array of DocumentBlocks

Parameters:

blocks - the blocks to read from

buffer - the buffer to write the data into

offset - the offset into the array of blocks to read from

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