Package org.snmp4j.asn1

Class BEROutputStream

java.lang.Object

java.io.OutputStream

org.snmp4j.asn1.BEROutputStream

All Implemented Interfaces:

Closeable, Flushable, AutoCloseable

public class BEROutputStream
extends OutputStream

The BEROutputStream class wraps a ByteBuffer to support BER encoding. The backing buffer can be accessed directly to optimize performance and memory usage.

Version:

1.0

Author:

Frank Fock

Constructor Summary

Constructors

Constructor	Description
BEROutputStream()	Creates a BER output stream without a backing buffer set.
BEROutputStream(ByteBuffer buffer)	Create a BEROutputStream that uses the supplied buffer as backing buffer.

Method Summary

Modifier and Type	Method	Description
void	close()
void	flush()
ByteBuffer	getBuffer()	Gets the backing buffer.
ByteBuffer	rewind()	Rewinds backing buffer and returns it.
void	setBuffer(ByteBuffer buffer)	Sets the backing buffer to the supplied one and sets the offset used by rewind() to the buffers current position.
void	setFilledBuffer(ByteBuffer buffer)	Sets the backing buffer and sets the current position of the stream to the buffers limit (end).
void	write(byte[] b)
void	write(byte[] b, int off, int len)
void	write(int b)

Methods inherited from class java.lang.Object

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

Constructor Details

BEROutputStream

public BEROutputStream()

Creates a BER output stream without a backing buffer set. In order to be able to write anything to the stream, setBuffer(ByteBuffer buffer) has to be called before. Otherwise a NullPointerException will be thrown when calling one of the write operations.

BEROutputStream

public BEROutputStream(ByteBuffer buffer)

Create a BEROutputStream that uses the supplied buffer as backing buffer.

Parameters:

buffer - a ByteBuffer whose limit and capacity must be greater or equal that the length of the encoded BER stream.

Method Details

write

public void write(int b)
           throws IOException

Specified by:

write in class OutputStream

Throws:

IOException

write

public void write(byte[] b)
           throws IOException

Overrides:

write in class OutputStream

Throws:

IOException

write

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

Overrides:

write in class OutputStream

Throws:

IOException

close

public void close()
           throws IOException

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Overrides:

close in class OutputStream

Throws:

IOException

flush

public void flush()
           throws IOException

Specified by:

flush in interface Flushable

Overrides:

flush in class OutputStream

Throws:

IOException

rewind

public ByteBuffer rewind()

Rewinds backing buffer and returns it. In contrast to the backing buffer's rewind method, this method sets the position of the buffer to the first byte of this output stream rather than to the first byte of the underlying byte array!

Returns:

the ByteBuffer backing this output stream with its current position set to the begin of the output stream.

getBuffer

public ByteBuffer getBuffer()

Gets the backing buffer.

Returns:

the ByteBuffer backing this output stream.

setBuffer

public void setBuffer(ByteBuffer buffer)

Sets the backing buffer to the supplied one and sets the offset used by rewind() to the buffers current position.

Parameters:

buffer - a ByteBuffer whose limit and capacity must be greater or equal that the length of the encoded BER stream.

setFilledBuffer

public void setFilledBuffer(ByteBuffer buffer)

Sets the backing buffer and sets the current position of the stream to the buffers limit (end).

Parameters:

buffer - a ByteBuffer whose limit and capacity must be greater or equal that the length of the encoded BER stream.