com.sssw.fw.util
Class EboByteBuffer

java.lang.Object
 |
 +--com.sssw.fw.util.EboByteBuffer

public class EboByteBuffer

extends Object

EboByteBuffer is a wrapper class around a byte array. A ByteBuffer API allows reads and writes without worrying about underlying byte array. This class is intended to be used as the underlying storage mechanism for pair(s) of Input/Output Stream classes that can attach/detach its underlying storage facility.. Please note, this class is not synchronized. It is up to the user of this storage facility to handle synchronization. This is a com.sssw.test.test reimplementation that uses a linked list of byte array chunks, rather than a single buffer that is copied. This is an attempt to get a couple of orders of magnitude performance improvement.

Constructor Summary

EboByteBuffer()
Creates a EboByteBuffer with the default byte array size and chunk count

EboByteBuffer(byte[] buf)
Creates a EboByteBuffer from the specified array of bytes.

EboByteBuffer(InputStream in)
No information available

EboByteBuffer(InputStream in, int incr)
Creates a EboByteBuffer from the contents of the specified InputStream.

EboByteBuffer(int size)
Creates a EboByteBuffer with the specified byte array size Will also grow by this size.

EboByteBuffer(String str)
No information available

Method Summary

int	available() Get the size of the available buffer space.
protected byte[]	getBuffer() Get the actual storage array N.B.
int	getPosition() Return the current position.
int	read() Read the next byte from the buffer.
int	read(byte[] buf, int offset, int len) Read a stream of bytes until the specified output array is full.
void	reset() Re-set the buffer to the empty state.
void	resetPos() Reset the cursor to start of buffer for reading
boolean	seek(int desiredPosition) Move the cursor position.
int	size() Get the current size of the buffer that is in use.
long	skip(long skipCnt) Move the cursor position forward by specified number of bytes.
byte[]	toByteArray() Get a copy of the in use portion of the buffer as a byte array
String	toString() Get the byte array as a String, using the default platform encoding.
String	toString(String enc) Get the byte array as a String, using the specified encoding.
void	write(byte[] bytes, int offset, int len) Write the specified number of bytes to the buffer.
void	write(int b) Write the specified byte to the buffer.
void	writeTo(OutputStream out) Writes the complete contents of this byte buffer to the specified output stream argument.

Methods inherited from class java.lang.Object

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

Constructor Detail

EboByteBuffer

public EboByteBuffer()

Creates a EboByteBuffer with the default byte array size and chunk count

EboByteBuffer

public EboByteBuffer(int size)

Creates a EboByteBuffer with the specified byte array size Will also grow by this size.

Parameters:

size - the initial buffer size

EboByteBuffer

public EboByteBuffer(byte[] buf)

Creates a EboByteBuffer from the specified array of bytes. The specified buffer is not copied, but is used in place!! This constructor also assumes that the byte array is fully inuse!!

Parameters:

buf - the input buffer (not copied)

EboByteBuffer

public EboByteBuffer(String str)

No information available

EboByteBuffer

public EboByteBuffer(InputStream in,
                     int incr)
              throws com.sssw.fw.util.IOException

Creates a EboByteBuffer from the contents of the specified InputStream.

Parameters:

in - The InputStream used to initialize the ByteBuffer

incr - An int increment size to grow buffer when needed

EboByteBuffer

public EboByteBuffer(InputStream in)
              throws com.sssw.fw.util.IOException

No information available

Method Detail

resetPos

public void resetPos()

Reset the cursor to start of buffer for reading

toByteArray

public byte[] toByteArray()

Get a copy of the in use portion of the buffer as a byte array

Returns:

byte array containing a copy of the buffer

toString

public String toString()

Get the byte array as a String, using the default platform encoding.

Overrides:

toString in class Object

Returns:

String value of byte array

toString

public String toString(String enc)
                throws UnsupportedEncodingException

Get the byte array as a String, using the specified encoding.

Parameters:

enc - The encoding name of the encoding to use.

Returns:

String value of byte array

available

public int available()

Get the size of the available buffer space.

Returns:

the number of bytes that can be read without blocking

size

public int size()

Get the current size of the buffer that is in use.

Returns:

the size of the buffer currently in use

reset

public void reset()

Re-set the buffer to the empty state.

getBuffer

protected byte[] getBuffer()

Get the actual storage array N.B. this is now an expensive operation because it copies the buffer!

read

public int read()

Read the next byte from the buffer.

Returns:

next byte value or -1 if at end of buffer

read

public int read(byte[] buf,
                int offset,
                int len)

Read a stream of bytes until the specified output array is full.

Parameters:

buf - output byte array

offset - starting index to use in the output array

len - the number of bytes to read

Returns:

number of bytes actually read or -1 if end of buffer is reached.

skip

public long skip(long skipCnt)

Move the cursor position forward by specified number of bytes.

Parameters:

skipCnt - requested number of bytes to skip

Returns:

actual number of bytes skipped

seek

public final boolean seek(int desiredPosition)

Move the cursor position.

Parameters:

position - requested position.

Returns:

true if position valid and false if out of range.

getPosition

public final int getPosition()

Return the current position.

Returns:

current position.

write

public void write(int b)

Write the specified byte to the buffer.

Parameters:

b - the byte to write to buffer

write

public void write(byte[] bytes,
                  int offset,
                  int len)

Write the specified number of bytes to the buffer.

Parameters:

b - byte array containing bytes to be written to buffer

offset - starting offset in the input byte array to use

len - number of bytes to be written

writeTo

public void writeTo(OutputStream out)
             throws com.sssw.fw.util.IOException

Writes the complete contents of this byte buffer to the specified output stream argument.

Parameters:

out - the output stream byte to write to.