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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      @Override
56      public long determineLength(final HttpMessage message) throws HttpException {
57          final long result = this.contentLengthStrategy.determineLength(message);
58          if (result == ContentLengthStrategy.IDENTITY) {
59              throw new ProtocolException("Identity transfer encoding cannot be used");
60          }
61          return result;
62      }
63  
64  }