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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.hc.core5.http2.protocol;
29  
30  import java.io.IOException;
31  
32  import org.apache.hc.core5.annotation.Contract;
33  import org.apache.hc.core5.annotation.ThreadingBehavior;
34  import org.apache.hc.core5.http.EntityDetails;
35  import org.apache.hc.core5.http.HttpException;
36  import org.apache.hc.core5.http.HttpResponse;
37  import org.apache.hc.core5.http.ProtocolVersion;
38  import org.apache.hc.core5.http.message.MessageSupport;
39  import org.apache.hc.core5.http.protocol.HttpContext;
40  import org.apache.hc.core5.http.protocol.ResponseContent;
41  import org.apache.hc.core5.util.Args;
42  
43  /**
44   * HTTP/2 compatible extension of {@link ResponseContent}.
45   *
46   * @since 5.0
47   */
48  @Contract(threading = ThreadingBehavior.IMMUTABLE)
49  public class H2ResponseContent extends ResponseContent {
50  
51      /**
52       * Singleton instance.
53       *
54       * @since 5.2
55       */
56      public static final H2ResponseContent INSTANCE = new H2ResponseContent();
57  
58      public H2ResponseContent() {
59          super();
60      }
61  
62      public H2ResponseContent(final boolean overwrite) {
63          super(overwrite);
64      }
65  
66      @Override
67      public void process(
68              final HttpResponse response,
69              final EntityDetails entity,
70              final HttpContext context) throws HttpException, IOException {
71          Args.notNull(context, "HTTP context");
72          final ProtocolVersion ver = context.getProtocolVersion();
73          if (ver.getMajor() < 2) {
74              super.process(response, entity, context);
75          } else if (entity != null) {
76              MessageSupport.addContentTypeHeader(response, entity);
77              MessageSupport.addContentEncodingHeader(response, entity);
78              MessageSupport.addTrailerHeader(response, entity);
79          }
80      }
81  
82  }