RequestContent.java revision 417f3b92ba4549b2f22340e3107d869d2b9c5bb8 
1/*
2 * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/main/java/org/apache/http/protocol/RequestContent.java $
3 * $Revision: 573864 $
4 * $Date: 2007-09-08 08:53:25 -0700 (Sat, 08 Sep 2007) $
5 *
6 * ====================================================================
7 * Licensed to the Apache Software Foundation (ASF) under one
8 * or more contributor license agreements.  See the NOTICE file
9 * distributed with this work for additional information
10 * regarding copyright ownership.  The ASF licenses this file
11 * to you under the Apache License, Version 2.0 (the
12 * "License"); you may not use this file except in compliance
13 * with the License.  You may obtain a copy of the License at
14 *
15 *   http://www.apache.org/licenses/LICENSE-2.0
16 *
17 * Unless required by applicable law or agreed to in writing,
18 * software distributed under the License is distributed on an
19 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
20 * KIND, either express or implied.  See the License for the
21 * specific language governing permissions and limitations
22 * under the License.
23 * ====================================================================
24 *
25 * This software consists of voluntary contributions made by many
26 * individuals on behalf of the Apache Software Foundation.  For more
27 * information on the Apache Software Foundation, please see
28 * <http://www.apache.org/>.
29 *
30 */
31
32package org.apache.http.protocol;
33
34import java.io.IOException;
35
36import org.apache.http.HttpEntity;
37import org.apache.http.HttpEntityEnclosingRequest;
38import org.apache.http.HttpException;
39import org.apache.http.HttpRequest;
40import org.apache.http.HttpRequestInterceptor;
41import org.apache.http.HttpVersion;
42import org.apache.http.ProtocolVersion;
43import org.apache.http.ProtocolException;
44
45/**
46 * A request interceptor that decides about the transport encoding.
47 *
48 * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
49 *
50 * @version $Revision: 573864 $
51 *
52 * @since 4.0
53 */
54public class RequestContent implements HttpRequestInterceptor {
55
56    public RequestContent() {
57        super();
58    }
59
60    public void process(final HttpRequest request, final HttpContext context)
61            throws HttpException, IOException {
62        if (request == null) {
63            throw new IllegalArgumentException("HTTP request may not be null");
64        }
65        if (request instanceof HttpEntityEnclosingRequest) {
66            if (request.containsHeader(HTTP.TRANSFER_ENCODING)) {
67                throw new ProtocolException("Transfer-encoding header already present");
68            }
69            if (request.containsHeader(HTTP.CONTENT_LEN)) {
70                throw new ProtocolException("Content-Length header already present");
71            }
72            ProtocolVersion ver = request.getRequestLine().getProtocolVersion();
73            HttpEntity entity = ((HttpEntityEnclosingRequest)request).getEntity();
74            if (entity == null) {
75                request.addHeader(HTTP.CONTENT_LEN, "0");
76                return;
77            }
78            // Must specify a transfer encoding or a content length
79            if (entity.isChunked() || entity.getContentLength() < 0) {
80                if (ver.lessEquals(HttpVersion.HTTP_1_0)) {
81                    throw new ProtocolException(
82                            "Chunked transfer encoding not allowed for " + ver);
83                }
84                request.addHeader(HTTP.TRANSFER_ENCODING, HTTP.CHUNK_CODING);
85            } else {
86                request.addHeader(HTTP.CONTENT_LEN, Long.toString(entity.getContentLength()));
87            }
88            // Specify a content type if known
89            if (entity.getContentType() != null && !request.containsHeader(
90                    HTTP.CONTENT_TYPE )) {
91                request.addHeader(entity.getContentType());
92            }
93            // Specify a content encoding if known
94            if (entity.getContentEncoding() != null && !request.containsHeader(
95                    HTTP.CONTENT_ENCODING)) {
96                request.addHeader(entity.getContentEncoding());
97            }
98        }
99    }
100
101}
102