org.jboss.netty.handler.codec.oneone

Class OneToOneEncoder

java.lang.Object

org.jboss.netty.handler.codec.oneone.OneToOneEncoder

All Implemented Interfaces:

ChannelDownstreamHandler, ChannelHandler

Direct Known Subclasses:

Base64Encoder, CompatibleObjectEncoder, HttpMessageEncoder, LengthFieldPrepender, ObjectEncoder, ProtobufEncoder, ProtobufVarint32LengthFieldPrepender, StringEncoder, WebSocketFrameEncoder, ZlibEncoder

public abstract class OneToOneEncoder
extends Object
implements ChannelDownstreamHandler

Transforms a write request into another write request. A typical setup for TCP/IP would be:

 ChannelPipeline pipeline = ...;

 // Decoders
 pipeline.addLast("frameDecoder", new DelimiterBasedFrameDecoder(80, Delimiters.nulDelimiter()));
 pipeline.addLast("customDecoder", new OneToOneDecoder() { ... });

 // Encoder
 pipeline.addLast("customEncoder", new OneToOneEncoder() { ... });
 

Version:

$Rev:231 $, $Date:2008-06-12 16:44:50 +0900 (목, 12 6월 2008) $

Author:

The Netty Project, Trustin Lee

Nested Class Summary

Nested classes/interfaces inherited from interface org.jboss.netty.channel.ChannelHandler

ChannelHandler.Sharable

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	OneToOneEncoder()

Method Summary

Methods

Modifier and Type	Method and Description
protected abstract Object	encode(ChannelHandlerContext ctx, Channel channel, Object msg) Transforms the specified message into another message and return the transformed message.
void	handleDownstream(ChannelHandlerContext ctx, ChannelEvent evt) Handles the specified downstream event.

Methods inherited from class java.lang.Object

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

Constructor Detail

OneToOneEncoder

protected OneToOneEncoder()

Method Detail

handleDownstream

public void handleDownstream(ChannelHandlerContext ctx,
                    ChannelEvent evt)
                      throws Exception

Description copied from interface: ChannelDownstreamHandler

Handles the specified downstream event.

Specified by:

handleDownstream in interface ChannelDownstreamHandler

Parameters:

ctx - the context object for this handler

evt - the downstream event to process or intercept

Throws:

Exception

encode

protected abstract Object encode(ChannelHandlerContext ctx,
            Channel channel,
            Object msg)
                          throws Exception

Transforms the specified message into another message and return the transformed message. Note that you can not return null, unlike you can in OneToOneDecoder.decode(ChannelHandlerContext, Channel, Object); you must return something, at least ChannelBuffers.EMPTY_BUFFER.

Throws:

Exception