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com.tangosol.io
Class MultiByteArrayOutputStream

java.lang.Object
java.io.OutputStream
com.tangosol.io.MultiByteArrayOutputStream

All Implemented Interfaces:

OutputStreaming, java.io.Closeable, java.io.Flushable

public class MultiByteArrayOutputStream

extends java.io.OutputStream

implements OutputStreaming

An OutputStream that accumulates the written data to a series of byte arrays that do not exceed a specified size.

Author:

cp 2001.11.13

Field Summary

protected byte[]	m_ab The current block of output.
protected int	m_cbBlock The max size of each block.
protected int	m_cBlocks The number of flushed blocks.
protected int	m_cbPadBack The number of additional bytes to allocate and leave free at the back (end) of each block
protected int	m_cbPadFront The number of additional bytes to allocate and leave free at the front (start) of each block
protected boolean	m_fClosed True after close is invoked.
protected java.util.List	m_listBlock The list of blocks.
protected int	m_of The offset into the current block of output.

Constructor Summary

MultiByteArrayOutputStream(int cbBlock)
Construct a MultiByteArrayOutputStream to write to byte arrays of the specified length.

MultiByteArrayOutputStream(int cbBlock, int cbPadFront, int cbPadBack)
Construct a MultiByteArrayOutputStream to write to byte arrays of the specified length, leaving the specified amount of padding at the front and back of each byte array.

Method Summary

protected void	check() Verify that the stream is still open.
void	close() Close the stream, flushing any accumulated bytes.
void	flush() Flush any accumulated bytes.
int	getBackPaddingSize() Determine the number of extra bytes of padding that will be allocated and left blank at the end of each block after the data portion.
byte[]	getBlock(int i) Obtain the specified block of data.
int	getBlockCount() Determine the number of blocks that have been written thus far.
int	getBlockDataSize() Determine the maximum number of bytes of data that will be stored in each block.
int	getBlockDataSize(int i) Determine the specific number of bytes of data stored in the specified block.
int	getFrontPaddingSize() Determine the number of extra bytes of padding that will be allocated and left blank at the start of each block in front of the data portion.
protected int	requestCapacity(int cbMore) Ensure that the current block contains some available capacity, preferably enough to fulfill the specified capacity.
java.lang.String	toString() Create a human readable string representing the data written to the stream.
void	write(byte[] abSrc, int ofSrc, int cbSrc) Writes len bytes from the specified byte array starting at offset off to this output stream.
void	write(int b) Writes the specified byte to this output stream.

Methods inherited from class java.io.OutputStream

write

Methods inherited from interface com.tangosol.io.OutputStreaming

write

Field Detail

m_ab

protected byte[] m_ab

The current block of output.

m_of

protected int m_of

The offset into the current block of output.

m_cbBlock

protected int m_cbBlock

The max size of each block.

m_cbPadFront

protected int m_cbPadFront

The number of additional bytes to allocate and leave free at the front (start) of each block

m_cbPadBack

protected int m_cbPadBack

The number of additional bytes to allocate and leave free at the back (end) of each block

m_listBlock

protected java.util.List m_listBlock

The list of blocks.

m_cBlocks

protected int m_cBlocks

The number of flushed blocks.

m_fClosed

protected boolean m_fClosed

True after close is invoked.

Constructor Detail

MultiByteArrayOutputStream

public MultiByteArrayOutputStream(int cbBlock)

Construct a MultiByteArrayOutputStream to write to byte arrays of the specified length.

Parameters:

cbBlock - the number of bytes (maximum) per block

MultiByteArrayOutputStream

public MultiByteArrayOutputStream(int cbBlock,
                                  int cbPadFront,
                                  int cbPadBack)

Construct a MultiByteArrayOutputStream to write to byte arrays of the specified length, leaving the specified amount of padding at the front and back of each byte array.

Parameters:

cbBlock - the number of data bytes (maximum) per block

cbPadFront - the number of additional bytes to allocate and leave free at the front (start) of each block

cbPadBack - the number of additional bytes to allocate and leave free at the back (end) of each block

Method Detail

write

public void write(int b)
           throws java.io.IOException

Writes the specified byte to this output stream.

Specified by:

write in interface OutputStreaming

Specified by:

write in class java.io.OutputStream

Parameters:

b - the byte.

Throws:

java.io.IOException - if an I/O error occurs. In particular, an IOException may be thrown if the output stream has been closed.

write

public void write(byte[] abSrc,
                  int ofSrc,
                  int cbSrc)
           throws java.io.IOException

Writes len bytes from the specified byte array starting at offset off to this output stream.

If b is null, a NullPointerException is thrown.

If off is negative, or len is negative, or off+len is greater than the length of the array b, then an IndexOutOfBoundsException is thrown.

Specified by:

write in interface OutputStreaming

Overrides:

write in class java.io.OutputStream

Parameters:

abSrc - the data

ofSrc - the start offset in the data

cbSrc - the number of bytes to write

Throws:

java.io.IOException - if an I/O error occurs. In particular, an IOException is thrown if the output stream is closed.

flush

public void flush()
           throws java.io.IOException

Flush any accumulated bytes.

Specified by:

flush in interface OutputStreaming

Specified by:

flush in interface java.io.Flushable

Overrides:

flush in class java.io.OutputStream

Throws:

java.io.IOException - if an I/O error occurs

close

public void close()
           throws java.io.IOException

Close the stream, flushing any accumulated bytes.

Specified by:

close in interface OutputStreaming

Specified by:

close in interface java.io.Closeable

Overrides:

close in class java.io.OutputStream

Throws:

java.io.IOException - if an I/O error occurs

toString

public java.lang.String toString()

Create a human readable string representing the data written to the stream.

Returns:

a String representation of the stream's contents

getBlockCount

public int getBlockCount()

Determine the number of blocks that have been written thus far.

Returns:

the number of blocks (byte arrays) of output that have any data

getBlock

public byte[] getBlock(int i)

Obtain the specified block of data.

Parameters:

i - block index in the range [0..getBlockCount()]; passing the getBlockCount() will return the active block

Returns:

the specified block (byte array) of output

getBlockDataSize

public int getBlockDataSize(int i)

Determine the specific number of bytes of data stored in the specified block.

Parameters:

i - block index in the range [0..getBlockCount()]; passing the getBlockCount() will return the size of the active block

Returns:

the number of data bytes in a block

getBlockDataSize

public int getBlockDataSize()

Determine the maximum number of bytes of data that will be stored in each block.

Returns:

the number of data bytes (maximum) per block

getFrontPaddingSize

public int getFrontPaddingSize()

Determine the number of extra bytes of padding that will be allocated and left blank at the start of each block in front of the data portion.

Returns:

the number of additional bytes to allocate and leave free at the front (start) of each block

getBackPaddingSize

public int getBackPaddingSize()

Determine the number of extra bytes of padding that will be allocated and left blank at the end of each block after the data portion.

Returns:

the number of additional bytes to allocate and leave free at the back (end) of each block

check

protected void check()
              throws java.io.IOException

Verify that the stream is still open.

Throws:

java.io.IOException

requestCapacity

protected int requestCapacity(int cbMore)

Ensure that the current block contains some available capacity, preferably enough to fulfill the specified capacity. As a result of calling this method m_ab and m_of may change. If this call returns then the current block is guarenteed to contain at least one free byte of available capacity.

Parameters:

cbMore - the requested capacity

Returns:

the size of the current block

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