2008-11-19 08:22:15 +01:00
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/*
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2009-08-28 09:15:49 +02:00
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* Copyright 2009 Red Hat, Inc.
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2009-06-19 19:48:17 +02:00
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*
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2009-08-28 09:15:49 +02:00
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* Red Hat licenses this file to you under the Apache License, version 2.0
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* (the "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at:
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2008-11-19 08:22:15 +01:00
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*
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2009-08-28 09:15:49 +02:00
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* http://www.apache.org/licenses/LICENSE-2.0
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2008-11-19 08:22:15 +01:00
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*
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2009-08-28 09:15:49 +02:00
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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2008-11-19 08:22:15 +01:00
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*/
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package org.jboss.netty.handler.codec.http;
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2009-02-12 07:37:22 +01:00
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import static org.jboss.netty.buffer.ChannelBuffers.*;
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2008-11-19 08:22:15 +01:00
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import static org.jboss.netty.handler.codec.http.HttpCodecUtil.*;
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2009-06-15 09:50:53 +02:00
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import java.io.UnsupportedEncodingException;
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2008-11-19 08:22:15 +01:00
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import java.util.List;
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import java.util.Set;
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import org.jboss.netty.buffer.ChannelBuffer;
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import org.jboss.netty.buffer.ChannelBuffers;
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2008-12-17 08:38:32 +01:00
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import org.jboss.netty.channel.Channel;
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2008-11-19 08:22:15 +01:00
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import org.jboss.netty.channel.ChannelHandlerContext;
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import org.jboss.netty.channel.ChannelPipelineCoverage;
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2008-12-17 08:38:32 +01:00
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import org.jboss.netty.handler.codec.oneone.OneToOneEncoder;
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2008-11-19 08:22:15 +01:00
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/**
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2009-06-19 17:35:19 +02:00
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* Encodes an {@link HttpMessage} or an {@link HttpChunk} into
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* a {@link ChannelBuffer}.
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*
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* <h3>Extensibility</h3>
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*
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* Please note that this encoder is designed to be extended to implement
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* a protocol derived from HTTP, such as
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* <a href="http://en.wikipedia.org/wiki/Real_Time_Streaming_Protocol">RTSP</a> and
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* <a href="http://en.wikipedia.org/wiki/Internet_Content_Adaptation_Protocol">ICAP</a>.
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* To implement the encoder of such a derived protocol, extend this class and
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* implement all abstract methods properly.
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2008-11-19 08:22:15 +01:00
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*
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* @author The Netty Project (netty-dev@lists.jboss.org)
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* @author Andy Taylor (andy.taylor@jboss.org)
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2009-10-14 07:46:40 +02:00
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* @author Trustin Lee (trustin@gmail.com)
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2008-12-03 10:00:29 +01:00
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* @version $Rev$, $Date$
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2009-07-20 05:37:35 +02:00
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*
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* @apiviz.landmark
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2008-11-19 08:22:15 +01:00
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*/
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2009-05-08 10:22:01 +02:00
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@ChannelPipelineCoverage("all")
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2008-12-17 08:38:32 +01:00
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public abstract class HttpMessageEncoder extends OneToOneEncoder {
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2009-02-12 08:03:35 +01:00
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private static final ChannelBuffer LAST_CHUNK = copiedBuffer("0\r\n\r\n", "ASCII");
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2009-02-12 08:01:26 +01:00
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2009-06-19 17:35:19 +02:00
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/**
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* Creates a new instance.
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*/
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protected HttpMessageEncoder() {
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super();
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}
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2008-11-19 08:22:15 +01:00
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@Override
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protected Object encode(ChannelHandlerContext ctx, Channel channel, Object msg) throws Exception {
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2009-02-12 07:37:22 +01:00
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if (msg instanceof HttpMessage) {
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HttpMessage request = (HttpMessage) msg;
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ChannelBuffer header = ChannelBuffers.dynamicBuffer(
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channel.getConfig().getBufferFactory());
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encodeInitialLine(header, request);
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encodeHeaders(header, request);
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header.writeBytes(CRLF);
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ChannelBuffer content = request.getContent();
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2009-04-02 11:10:57 +02:00
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if (!content.readable()) {
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2009-02-12 07:37:22 +01:00
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return header; // no content
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} else {
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return wrappedBuffer(header, content);
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}
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2009-03-04 14:45:40 +01:00
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}
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if (msg instanceof HttpChunk) {
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2009-02-12 07:37:22 +01:00
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HttpChunk chunk = (HttpChunk) msg;
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2009-11-17 08:22:06 +01:00
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if (chunk == HttpChunk.LAST_CHUNK) {
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2009-02-12 08:01:26 +01:00
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return LAST_CHUNK.duplicate();
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} else {
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ChannelBuffer content = chunk.getContent();
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int contentLength = content.readableBytes();
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2009-02-12 07:37:22 +01:00
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2009-02-12 08:01:26 +01:00
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return wrappedBuffer(
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2009-02-12 08:03:35 +01:00
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copiedBuffer(Integer.toHexString(contentLength), "ASCII"),
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2009-02-12 08:01:26 +01:00
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wrappedBuffer(CRLF),
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content.slice(content.readerIndex(), contentLength),
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wrappedBuffer(CRLF));
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}
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2008-11-19 08:22:15 +01:00
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}
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2009-02-12 07:37:22 +01:00
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// Unknown message type.
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return msg;
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2008-11-19 08:22:15 +01:00
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}
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2009-06-19 17:35:19 +02:00
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private void encodeHeaders(ChannelBuffer buf, HttpMessage message) {
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2008-11-19 08:22:15 +01:00
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Set<String> headers = message.getHeaderNames();
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2009-06-15 09:50:53 +02:00
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try {
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for (String header : headers) {
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List<String> values = message.getHeaders(header);
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for (String value : values) {
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2008-11-19 08:22:15 +01:00
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2009-06-15 09:50:53 +02:00
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buf.writeBytes(header.getBytes("ASCII"));
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buf.writeByte(COLON);
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buf.writeByte(SP);
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buf.writeBytes(value.getBytes("ASCII"));
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buf.writeBytes(CRLF);
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}
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2008-11-19 08:22:15 +01:00
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}
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2009-06-15 09:50:53 +02:00
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} catch (UnsupportedEncodingException e) {
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throw (Error) new Error().initCause(e);
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2008-11-19 08:22:15 +01:00
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}
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}
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protected abstract void encodeInitialLine(ChannelBuffer buf, HttpMessage message) throws Exception;
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}
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