1 /*
2 * ====================================================================
3 * Licensed to the Apache Software Foundation (ASF) under one
4 * or more contributor license agreements. See the NOTICE file
5 * distributed with this work for additional information
6 * regarding copyright ownership. The ASF licenses this file
7 * to you under the Apache License, Version 2.0 (the
8 * "License"); you may not use this file except in compliance
9 * with the License. You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing,
14 * software distributed under the License is distributed on an
15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16 * KIND, either express or implied. See the License for the
17 * specific language governing permissions and limitations
18 * under the License.
19 * ====================================================================
20 *
21 * This software consists of voluntary contributions made by many
22 * individuals on behalf of the Apache Software Foundation. For more
23 * information on the Apache Software Foundation, please see
24 * <http://www.apache.org/>.
25 *
26 */
27
28 package org.apache.http.impl.entity;
29
30 import org.apache.http.HttpException;
31 import org.apache.http.HttpMessage;
32 import org.apache.http.ProtocolException;
33 import org.apache.http.annotation.ThreadingBehavior;
34 import org.apache.http.annotation.Contract;
35 import org.apache.http.entity.ContentLengthStrategy;
36
37 /**
38 * Decorator for {@link ContentLengthStrategy} implementations that disallows the use of
39 * identity transfer encoding.
40 *
41 * @since 4.2
42 */
43 @Contract(threading = ThreadingBehavior.IMMUTABLE_CONDITIONAL)
44 public class DisallowIdentityContentLengthStrategy implements ContentLengthStrategy {
45
46 public static final DisallowIdentityContentLengthStrategy INSTANCE =
47 new DisallowIdentityContentLengthStrategy(new LaxContentLengthStrategy(0));
48
49 private final ContentLengthStrategy contentLengthStrategy;
50
51 public DisallowIdentityContentLengthStrategy(final ContentLengthStrategy contentLengthStrategy) {
52 super();
53 this.contentLengthStrategy = contentLengthStrategy;
54 }
55
56 @Override
57 public long determineLength(final HttpMessage message) throws HttpException {
58 final long result = this.contentLengthStrategy.determineLength(message);
59 if (result == ContentLengthStrategy.IDENTITY) {
60 throw new ProtocolException("Identity transfer encoding cannot be used");
61 }
62 return result;
63 }
64
65 }