/*
    * ====================================================================
    * 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.http.nio.protocol;
  
  import java.io.IOException;
  
  import org.apache.http.HttpEntity;
  import org.apache.http.HttpResponse;
  import org.apache.http.nio.ContentEncoder;
  import org.apache.http.nio.IOControl;
  import org.apache.http.nio.entity.EntityAsyncContentProducer;
  import org.apache.http.nio.entity.HttpAsyncContentProducer;
  import org.apache.http.protocol.HTTP;
  import org.apache.http.protocol.HttpContext;
  
  /**
   * This class changed from package private to public in version 4.4.8.
   *
   * @since 4.4.8
   */
  public class ErrorResponseProducer implements HttpAsyncResponseProducer {
  
      private final HttpResponse response;
      private final HttpEntity entity;
      private final HttpAsyncContentProducer contentProducer;
      private final boolean keepAlive;
  
      public ErrorResponseProducer(
              final HttpResponse response,
              final HttpEntity entity,
              final boolean keepAlive) {
          super();
          this.response = response;
          this.entity = entity;
          if (entity instanceof HttpAsyncContentProducer) {
              this.contentProducer = (HttpAsyncContentProducer) entity;
          } else {
              this.contentProducer = new EntityAsyncContentProducer(entity);
          }
          this.keepAlive = keepAlive;
      }
  
      @Override
      public HttpResponse generateResponse() {
          if (this.keepAlive) {
              response.addHeader(HTTP.CONN_DIRECTIVE, HTTP.CONN_KEEP_ALIVE);
          } else {
              response.addHeader(HTTP.CONN_DIRECTIVE, HTTP.CONN_CLOSE);
          }
          response.setEntity(this.entity);
          return response;
      }
  
      @Override
      public void produceContent(
              final ContentEncoder encoder, final IOControl ioControl) throws IOException {
          this.contentProducer.produceContent(encoder, ioControl);
      }
  
      @Override
      public void responseCompleted(final HttpContext context) {
      }
  
      @Override
      public void failed(final Exception ex) {
      }
  
      @Override
      public void close() throws IOException {
          this.contentProducer.close();
      }
  
  }