## org.jboss.netty.handler.codec.http
Class HttpMessageEncoder

    java.lang.Object
      org.jboss.netty.handler.codec.oneone.OneToOneEncoder
          org.jboss.netty.handler.codec.http.HttpMessageEncoder

All Implemented Interfaces:
  ChannelDownstreamHandler, ChannelHandler

Direct Known Subclasses:
  HttpRequestEncoder, HttpResponseEncoder, RtspMessageEncoder

    public abstract class HttpMessageEncoder

extends OneToOneEncoder

Encodes an `HttpMessage` or an `HttpChunk` into a `ChannelBuffer`.

### Extensibility

Please note that this encoder is designed to be extended to implement a protocol derived from HTTP, such as RTSP and ICAP. To implement the encoder of such a derived protocol, extend this class and implement all abstract methods properly.

Version:
  $Rev: 2121 $, $Date: 2010-02-02 09:38:07 +0900 (Tue, 02 Feb 2010) $
Author:
  The Netty Project, Andy Taylor (andy.taylor@jboss.org), Trustin Lee

Nested Class Summary

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

Constructor Summary
`protected` `HttpMessageEncoder()` Creates a new instance.

Method Summary
`protected Object` `encode(ChannelHandlerContext ctx, Channel channel, Object msg)` Transforms the specified message into another message and return the transformed message.
`protected abstract void` `encodeInitialLine(ChannelBuffer buf, HttpMessage message)`

Methods inherited from class org.jboss.netty.handler.codec.oneone.OneToOneEncoder
`handleDownstream`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### HttpMessageEncoder

    protected HttpMessageEncoder()

  Creates a new instance.

Method Detail

### encode

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

  Description copied from class: `OneToOneEncoder`
  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`.

  Specified by:
    `encode` in class `OneToOneEncoder`
  Throws:
    `Exception`

### encodeInitialLine

    protected abstract void encodeInitialLine(ChannelBuffer buf,
                                              HttpMessage message)
                                       throws Exception

  Throws:
    `Exception`

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