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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  package org.apache.hc.client5.http.async.methods;
28  
29  import java.io.IOException;
30  import java.io.UnsupportedEncodingException;
31  import java.nio.charset.UnsupportedCharsetException;
32  
33  import org.apache.hc.core5.concurrent.FutureCallback;
34  import org.apache.hc.core5.http.ContentType;
35  import org.apache.hc.core5.http.EntityDetails;
36  import org.apache.hc.core5.http.HttpException;
37  import org.apache.hc.core5.http.HttpResponse;
38  import org.apache.hc.core5.http.nio.AsyncResponseConsumer;
39  import org.apache.hc.core5.http.nio.entity.AbstractBinDataConsumer;
40  import org.apache.hc.core5.http.protocol.HttpContext;
41  
42  /**
43   * Abstract response consumer that processes response body data as an octet stream.
44   *
45   * @since 5.0
46   *
47   * @param <T> response message representation.
48   */
49  public abstract class AbstractBinResponseConsumer<T> extends AbstractBinDataConsumer implements AsyncResponseConsumer<T> {
50  
51      private volatile FutureCallback<T> resultCallback;
52  
53      /**
54       * Triggered to signal the beginning of response processing.
55       *
56       * @param response the response message head
57       * @param contentType the content type of the response body,
58       *                    or {@code null} if the response does not enclose a response entity.
59       * @throws HttpException If a protocol error occurs.
60       * @throws IOException   If an I/O error occurs.
61       */
62      protected abstract void start(HttpResponse response, ContentType contentType) throws HttpException, IOException;
63  
64      /**
65       * Triggered to generate object that represents a result of response message processing.
66       *
67       * @return the result of response processing.
68       */
69      protected abstract T buildResult();
70  
71      @Override
72      public void informationResponse(
73              final HttpResponse response,
74              final HttpContext context) throws HttpException, IOException {
75      }
76  
77      @Override
78      public final void consumeResponse(
79              final HttpResponse response,
80              final EntityDetails entityDetails,
81              final HttpContext context,
82              final FutureCallback<T> resultCallback) throws HttpException, IOException {
83          this.resultCallback = resultCallback;
84          if (entityDetails != null) {
85              try {
86                  final ContentType contentType = ContentType.parse(entityDetails.getContentType());
87                  start(response, contentType != null ? contentType : ContentType.DEFAULT_BINARY);
88              } catch (final UnsupportedCharsetException ex) {
89                  throw new UnsupportedEncodingException(ex.getMessage());
90              }
91          } else {
92              start(response, null);
93              completed();
94          }
95  
96      }
97  
98      @Override
99      protected final void completed() {
100         resultCallback.completed(buildResult());
101     }
102 
103     @Override
104     public void failed(final Exception cause) {
105     }
106 
107 }