com.informix.csm

Class IfxCsmBuffer

java.lang.Object

java.io.OutputStream

java.io.ByteArrayOutputStream

com.informix.csm.IfxCsmBuffer

All Implemented Interfaces:

java.io.Closeable, java.io.Flushable, java.lang.AutoCloseable

public class IfxCsmBuffer
extends java.io.ByteArrayOutputStream

Field Summary

Fields inherited from class java.io.ByteArrayOutputStream

buf, count

Constructor Summary

Constructors

Constructor and Description
IfxCsmBuffer()
IfxCsmBuffer(int initSize)

Method Summary

Modifier and Type	Method and Description
int	getCount()
void	initialize(IfxCsmBuffer anotherBuffer) this shall initialize this csmBuffer with contents ( i.e.
void	initialize(IfxCsmReadBuffer bis) populates buf reference with internal buffer reference from bis Be aware that this method does not care about the current position (pos) of bis
int	read(byte[] b, int off, int len) copies len number fo bytes from byte array buf into byte array b ***************IMPORTANT **************************** Note that this read does not behave like read on an input stream if you read say n bytes and then again call read to ream next m bytes you are going to get n as well as m from begining of buf thus you shall end up getting first m bytes from array and NOT m bytes from position buf[n]
byte[]	read(int len) Allocates a byte array , copies len bytes from byte array buf to it and returns the array
int	readWithReset(byte[] b, int off, int len) This functions reads bytes from byte array buf creates a new byte array copies unread bytes from buf to new byte array replaces byte array referred to by buf with this new array Also resets count .
byte[]	readWithReset(int len)
void	reset() we are overriding default implementation of reset() in ByteArrayOutputStream The default implementation does not release the internal buffer 'buf' but just resets count to zero.
void	resetAndwrite(byte[] b)
byte[]	toByteArray()
byte[]	toByteArrayWithReset()
void	write(byte[] b)
void	write(byte[] b, int off, int len)
void	write(int b)
void	writeTo(java.io.OutputStream out)

Methods inherited from class java.io.ByteArrayOutputStream

close, size, toString, toString, toString

Methods inherited from class java.io.OutputStream

flush

Methods inherited from class java.lang.Object

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

Constructor Detail

IfxCsmBuffer

public IfxCsmBuffer()

IfxCsmBuffer

public IfxCsmBuffer(int initSize)

Method Detail

initialize

public void initialize(IfxCsmBuffer anotherBuffer)

this shall initialize this csmBuffer with contents ( i.e. buf and count) from another CSM buffer. IMPORTANT : SHALL RESET anotherBuffer so that it does not holds reference to the buf anymore . If we do not do this , any writes called on anotherBuffer after it is used to initialize this csmBuffer shall result in contents of this csmBuffer also getting changed. This is diffrent from reset() implementation as in JDK as BufferedOutputStream:reset() does not allocate a new internal buffer. it just sets count to zero

Parameters:

anotherBuffer - used to initialize this buffer Note that anotherBuffer IS RESET

initialize

public void initialize(IfxCsmReadBuffer bis)

populates buf reference with internal buffer reference from bis Be aware that this method does not care about the current position (pos) of bis

Parameters:

bis -

write

public void write(byte[] b,
                  int off,
                  int len)

Overrides:

write in class java.io.ByteArrayOutputStream

write

public void write(byte[] b)

Overrides:

write in class java.io.OutputStream

resetAndwrite

public void resetAndwrite(byte[] b)

write

public void write(int b)

Overrides:

write in class java.io.ByteArrayOutputStream

toByteArray

public byte[] toByteArray()

Overrides:

toByteArray in class java.io.ByteArrayOutputStream

toByteArrayWithReset

public byte[] toByteArrayWithReset()

read

public int read(byte[] b,
                int off,
                int len)

copies len number fo bytes from byte array buf into byte array b ***************IMPORTANT **************************** Note that this read does not behave like read on an input stream if you read say n bytes and then again call read to ream next m bytes you are going to get n as well as m from begining of buf thus you shall end up getting first m bytes from array and NOT m bytes from position buf[n]

Parameters:

b -

off -

len -

Returns:

read

public byte[] read(int len)

Allocates a byte array , copies len bytes from byte array buf to it and returns the array

Parameters:

len -

Returns:

readWithReset

public byte[] readWithReset(int len)

readWithReset

public int readWithReset(byte[] b,
                         int off,
                         int len)

This functions reads bytes from byte array buf creates a new byte array copies unread bytes from buf to new byte array replaces byte array referred to by buf with this new array Also resets count .

Parameters:

b -

off -

len -

Returns:

getCount

public int getCount()

reset

public void reset()

we are overriding default implementation of reset() in ByteArrayOutputStream The default implementation does not release the internal buffer 'buf' but just resets count to zero. Thus internal buffer buf is reused however in this overridden reset method , we shall be allocating new internal byte array buffer buf so that we lose reference to old buffer completely.

Overrides:

reset in class java.io.ByteArrayOutputStream

writeTo

public void writeTo(java.io.OutputStream out)
             throws java.io.IOException

Overrides:

writeTo in class java.io.ByteArrayOutputStream

Throws:

java.io.IOException