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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.nio.protocol;
29  
30  import java.io.IOException;
31  
32  import org.apache.http.HttpEntity;
33  import org.apache.http.HttpResponse;
34  import org.apache.http.nio.ContentEncoder;
35  import org.apache.http.nio.IOControl;
36  import org.apache.http.nio.entity.EntityAsyncContentProducer;
37  import org.apache.http.nio.entity.HttpAsyncContentProducer;
38  import org.apache.http.protocol.HTTP;
39  import org.apache.http.protocol.HttpContext;
40  
41  class ErrorResponseProducer implements HttpAsyncResponseProducer {
42  
43      private final HttpResponse response;
44      private final HttpEntity entity;
45      private final HttpAsyncContentProducer contentProducer;
46      private final boolean keepAlive;
47  
48      ErrorResponseProducer(
49              final HttpResponse response,
50              final HttpEntity entity,
51              final boolean keepAlive) {
52          super();
53          this.response = response;
54          this.entity = entity;
55          if (entity instanceof HttpAsyncContentProducer) {
56              this.contentProducer = (HttpAsyncContentProducer) entity;
57          } else {
58              this.contentProducer = new EntityAsyncContentProducer(entity);
59          }
60          this.keepAlive = keepAlive;
61      }
62  
63      public HttpResponse generateResponse() {
64          if (this.keepAlive) {
65              response.addHeader(HTTP.CONN_DIRECTIVE, HTTP.CONN_KEEP_ALIVE);
66          } else {
67              response.addHeader(HTTP.CONN_DIRECTIVE, HTTP.CONN_CLOSE);
68          }
69          response.setEntity(this.entity);
70          return response;
71      }
72  
73      public void produceContent(
74              final ContentEncoder encoder, final IOControl ioctrl) throws IOException {
75          this.contentProducer.produceContent(encoder, ioctrl);
76      }
77  
78      public void responseCompleted(final HttpContext context) {
79      }
80  
81      public void failed(final Exception ex) {
82      }
83  
84      public void close() throws IOException {
85          this.contentProducer.close();
86      }
87  
88  }