/*
    * ====================================================================
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
    * with the License.  You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  
  package org.apache.hc.core5.http.io.support;
  
  import java.io.IOException;
  
  import org.apache.hc.core5.http.ClassicHttpRequest;
  import org.apache.hc.core5.http.ClassicHttpResponse;
  import org.apache.hc.core5.http.HttpException;
  import org.apache.hc.core5.http.HttpRequestMapper;
  import org.apache.hc.core5.http.HttpResponseFactory;
  import org.apache.hc.core5.http.HttpStatus;
  import org.apache.hc.core5.http.impl.io.DefaultClassicHttpResponseFactory;
  import org.apache.hc.core5.http.io.HttpRequestHandler;
  import org.apache.hc.core5.http.io.HttpServerRequestHandler;
  import org.apache.hc.core5.http.protocol.HttpContext;
  import org.apache.hc.core5.util.Args;
  
  /**
   * Basic {@link HttpServerRequestHandler} implementation that makes use of
   * {@link HttpRequestMapper} to dispatch the request to a particular
   * {@link HttpRequestHandler} for processing.
   *
   * @since 5.0
   */
  public class BasicHttpServerRequestHandler implements HttpServerRequestHandler {
  
      private final HttpRequestMapper<HttpRequestHandler> handlerMapper;
      private final HttpResponseFactory<ClassicHttpResponse> responseFactory;
  
      public BasicHttpServerRequestHandler(
              final HttpRequestMapper<HttpRequestHandler> handlerMapper,
              final HttpResponseFactory<ClassicHttpResponse> responseFactory) {
          this.handlerMapper = Args.notNull(handlerMapper, "Handler mapper");
          this.responseFactory = responseFactory != null ? responseFactory : DefaultClassicHttpResponseFactory.INSTANCE;
      }
  
      public BasicHttpServerRequestHandler(final HttpRequestMapper<HttpRequestHandler> handlerMapper) {
          this(handlerMapper, null);
      }
  
      @Override
      public void handle(
              final ClassicHttpRequest request,
              final ResponseTrigger responseTrigger,
              final HttpContext context) throws HttpException, IOException {
          final ClassicHttpResponse response = responseFactory.newHttpResponse(HttpStatus.SC_OK);
          final HttpRequestHandler handler = handlerMapper != null ? handlerMapper.resolve(request, context) : null;
          if (handler != null) {
              handler.handle(request, response, context);
          } else {
              response.setCode(HttpStatus.SC_NOT_IMPLEMENTED);
          }
          responseTrigger.submitResponse(response);
      }
  
  }