/*
    * ====================================================================
    * 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.impl;
  
  import org.apache.hc.core5.annotation.Internal;
  import org.apache.hc.core5.http.EntityDetails;
  import org.apache.hc.core5.http.HttpException;
  import org.apache.hc.core5.http.HttpResponse;
  import org.apache.hc.core5.http.HttpStatus;
  import org.apache.hc.core5.http.MethodNotSupportedException;
  import org.apache.hc.core5.http.MisdirectedRequestException;
  import org.apache.hc.core5.http.NotImplementedException;
  import org.apache.hc.core5.http.ProtocolException;
  import org.apache.hc.core5.http.RequestHeaderFieldsTooLargeException;
  import org.apache.hc.core5.http.UnsupportedHttpVersionException;
  
  /**
   * HTTP Server support methods.
   *
   * @since 5.0
   */
  @Internal
  public class ServerSupport {
  
      public static void validateResponse(
              final HttpResponse response,
              final EntityDetails responseEntityDetails) throws HttpException {
          final int status = response.getCode();
          switch (status) {
              case HttpStatus.SC_NO_CONTENT:
              case HttpStatus.SC_NOT_MODIFIED:
                  if (responseEntityDetails != null) {
                      throw new HttpException("Response " + status + " must not enclose an entity");
                  }
          }
      }
  
      public static String toErrorMessage(final Exception ex) {
          final String message = ex.getMessage();
          return message != null ? message : ex.toString();
      }
  
      public static int toStatusCode(final Exception ex) {
          final int code;
          if (ex instanceof MethodNotSupportedException) {
              code = HttpStatus.SC_NOT_IMPLEMENTED;
          } else if (ex instanceof UnsupportedHttpVersionException) {
              code = HttpStatus.SC_HTTP_VERSION_NOT_SUPPORTED;
          } else if (ex instanceof NotImplementedException) {
              code = HttpStatus.SC_NOT_IMPLEMENTED;
          } else if (ex instanceof RequestHeaderFieldsTooLargeException) {
              code = HttpStatus.SC_REQUEST_HEADER_FIELDS_TOO_LARGE;
          } else if (ex instanceof MisdirectedRequestException) {
              code = HttpStatus.SC_MISDIRECTED_REQUEST;
          } else if (ex instanceof ProtocolException) {
              code = HttpStatus.SC_BAD_REQUEST;
          } else {
              code = HttpStatus.SC_INTERNAL_SERVER_ERROR;
          }
          return code;
      }
  
  }