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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.io.support;
28  
29  import java.io.IOException;
30  
31  import org.apache.hc.core5.annotation.Contract;
32  import org.apache.hc.core5.annotation.ThreadingBehavior;
33  import org.apache.hc.core5.http.ClassicHttpRequest;
34  import org.apache.hc.core5.http.ClassicHttpResponse;
35  import org.apache.hc.core5.http.HttpException;
36  import org.apache.hc.core5.http.HttpRequestMapper;
37  import org.apache.hc.core5.http.HttpResponseFactory;
38  import org.apache.hc.core5.http.HttpStatus;
39  import org.apache.hc.core5.http.impl.io.DefaultClassicHttpResponseFactory;
40  import org.apache.hc.core5.http.io.HttpFilterChain;
41  import org.apache.hc.core5.http.io.HttpFilterHandler;
42  import org.apache.hc.core5.http.io.HttpRequestHandler;
43  import org.apache.hc.core5.http.protocol.HttpContext;
44  import org.apache.hc.core5.util.Args;
45  
46  /**
47   * {@link HttpFilterHandler} implementation represents a terminal handler
48   * in a request processing pipeline that makes use of {@link HttpRequestMapper}
49   * to dispatch the request to a particular {@link HttpRequestHandler}.
50   *
51   * @since 5.0
52   */
53  @Contract(threading = ThreadingBehavior.STATELESS)
54  public final class TerminalServerFilter implements HttpFilterHandler {
55  
56      private final HttpRequestMapper<HttpRequestHandler> handlerMapper;
57      private final HttpResponseFactory<ClassicHttpResponse> responseFactory;
58  
59      public TerminalServerFilter(
60              final HttpRequestMapper<HttpRequestHandler> handlerMapper,
61              final HttpResponseFactory<ClassicHttpResponse> responseFactory) {
62          this.handlerMapper = Args.notNull(handlerMapper, "Handler mapper");
63          this.responseFactory = responseFactory != null ? responseFactory : DefaultClassicHttpResponseFactory.INSTANCE;
64      }
65  
66      @Override
67      public final void handle(
68              final ClassicHttpRequest request,
69              final HttpFilterChain.ResponseTrigger responseTrigger,
70              final HttpContext context,
71              final HttpFilterChain chain) throws HttpException, IOException {
72          final ClassicHttpResponse response = responseFactory.newHttpResponse(HttpStatus.SC_OK);
73          final HttpRequestHandler handler = handlerMapper.resolve(request, context);
74          if (handler != null) {
75              handler.handle(request, response, context);
76          } else {
77              response.setCode(HttpStatus.SC_NOT_IMPLEMENTED);
78          }
79          responseTrigger.submitResponse(response);
80      }
81  }