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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.core5.http.nio.support;
28  
29  import org.apache.hc.core5.function.Decorator;
30  import org.apache.hc.core5.function.Supplier;
31  import org.apache.hc.core5.http.HttpException;
32  import org.apache.hc.core5.http.HttpRequest;
33  import org.apache.hc.core5.http.HttpRequestMapper;
34  import org.apache.hc.core5.http.HttpStatus;
35  import org.apache.hc.core5.http.MisdirectedRequestException;
36  import org.apache.hc.core5.http.nio.AsyncServerExchangeHandler;
37  import org.apache.hc.core5.http.nio.HandlerFactory;
38  import org.apache.hc.core5.http.protocol.HttpContext;
39  import org.apache.hc.core5.util.Args;
40  
41  /**
42   * @since 5.0
43   */
44  public final class DefaultAsyncResponseExchangeHandlerFactory implements HandlerFactory<AsyncServerExchangeHandler> {
45  
46      private final HttpRequestMapper<Supplier<AsyncServerExchangeHandler>> mapper;
47      private final Decorator<AsyncServerExchangeHandler> decorator;
48  
49      public DefaultAsyncResponseExchangeHandlerFactory(
50              final HttpRequestMapper<Supplier<AsyncServerExchangeHandler>> mapper,
51              final Decorator<AsyncServerExchangeHandler> decorator) {
52          this.mapper = Args.notNull(mapper, "Request handler mapper");
53          this.decorator = decorator;
54      }
55  
56      public DefaultAsyncResponseExchangeHandlerFactory(final HttpRequestMapper<Supplier<AsyncServerExchangeHandler>> mapper) {
57          this(mapper, null);
58      }
59  
60      private AsyncServerExchangeHandler createHandler(final HttpRequest request, final HttpContext context) throws HttpException {
61          try {
62              final Supplier<AsyncServerExchangeHandler> supplier = mapper.resolve(request, context);
63              if (supplier != null) {
64                  return supplier.get();
65              } else {
66                  return new ImmediateResponseExchangeHandler(HttpStatus.SC_NOT_FOUND, "Resource not found");
67              }
68          } catch (final MisdirectedRequestException ex) {
69              return new ImmediateResponseExchangeHandler(HttpStatus.SC_MISDIRECTED_REQUEST, "Not authoritative");
70          }
71      }
72  
73      @Override
74      public AsyncServerExchangeHandler create(final HttpRequest request, final HttpContext context) throws HttpException {
75          final AsyncServerExchangeHandler handler = createHandler(request, context);
76          if (handler != null) {
77              return decorator != null ? decorator.decorate(handler) : handler;
78          } else {
79              return null;
80          }
81      }
82  
83  }