1 /*
2 * Copyright 2012 The Netty Project
3 *
4 * The Netty Project licenses this file to you under the Apache License,
5 * version 2.0 (the "License"); you may not use this file except in compliance
6 * with the License. You may obtain a copy of the License at:
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13 * License for the specific language governing permissions and limitations
14 * under the License.
15 */
16 package org.jboss.netty.handler.codec.http;
17
18 import org.jboss.netty.buffer.ChannelBuffer;
19 import org.jboss.netty.channel.ChannelPipeline;
20 import org.jboss.netty.handler.codec.frame.TooLongFrameException;
21
22
23 /**
24 * Decodes {@link ChannelBuffer}s into {@link HttpRequest}s and {@link HttpChunk}s.
25 *
26 * <h3>Parameters that prevents excessive memory consumption</h3>
27 * <table border="1">
28 * <tr>
29 * <th>Name</th><th>Meaning</th>
30 * </tr>
31 * <tr>
32 * <td>{@code maxInitialLineLength}</td>
33 * <td>The maximum length of the initial line (e.g. {@code "GET / HTTP/1.0"})
34 * If the length of the initial line exceeds this value, a
35 * {@link TooLongFrameException} will be raised.</td>
36 * </tr>
37 * <tr>
38 * <td>{@code maxHeaderSize}</td>
39 * <td>The maximum length of all headers. If the sum of the length of each
40 * header exceeds this value, a {@link TooLongFrameException} will be raised.</td>
41 * </tr>
42 * <tr>
43 * <td>{@code maxChunkSize}</td>
44 * <td>The maximum length of the content or each chunk. If the content length
45 * exceeds this value, the transfer encoding of the decoded request will be
46 * converted to 'chunked' and the content will be split into multiple
47 * {@link HttpChunk}s. If the transfer encoding of the HTTP request is
48 * 'chunked' already, each chunk will be split into smaller chunks if the
49 * length of the chunk exceeds this value. If you prefer not to handle
50 * {@link HttpChunk}s in your handler, insert {@link HttpChunkAggregator}
51 * after this decoder in the {@link ChannelPipeline}.</td>
52 * </tr>
53 * </table>
54 */
55 public class HttpRequestDecoder extends HttpMessageDecoder {
56
57 /**
58 * Creates a new instance with the default
59 * {@code maxInitialLineLength (4096}}, {@code maxHeaderSize (8192)}, and
60 * {@code maxChunkSize (8192)}.
61 */
62 public HttpRequestDecoder() {
63 }
64
65 /**
66 * Creates a new instance with the specified parameters.
67 */
68 public HttpRequestDecoder(
69 int maxInitialLineLength, int maxHeaderSize, int maxChunkSize) {
70 super(maxInitialLineLength, maxHeaderSize, maxChunkSize);
71 }
72
73 @Override
74 protected HttpMessage createMessage(String[] initialLine) throws Exception {
75 return new DefaultHttpRequest(
76 HttpVersion.valueOf(initialLine[2]), HttpMethod.valueOf(initialLine[0]), initialLine[1]);
77 }
78
79 @Override
80 protected boolean isDecodingRequest() {
81 return true;
82 }
83 }