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.Immutable;
34 import org.apache.http.entity.ContentLengthStrategy;
35
36 /**
37 * Decorator for {@link ContentLengthStrategy} implementations that disallows the use of
38 * identity transfer encoding.
39 *
40 * @since 4.2
41 */
42 @Immutable
43 public class DisallowIdentityContentLengthStrategy implements ContentLengthStrategy {
44
45 public static final DisallowIdentityContentLengthStrategy INSTANCE =
46 new DisallowIdentityContentLengthStrategy(new LaxContentLengthStrategy(0));
47
48 private final ContentLengthStrategy contentLengthStrategy;
49
50 public DisallowIdentityContentLengthStrategy(final ContentLengthStrategy contentLengthStrategy) {
51 super();
52 this.contentLengthStrategy = contentLengthStrategy;
53 }
54
55 public long determineLength(final HttpMessage message) throws HttpException {
56 final long result = this.contentLengthStrategy.determineLength(message);
57 if (result == ContentLengthStrategy.IDENTITY) {
58 throw new ProtocolException("Identity transfer encoding cannot be used");
59 }
60 return result;
61 }
62
63 }