/*
    * Copyright 2012 The Netty Project
    *
    * The Netty Project 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:
    *
    *   https://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.
   */
  package io.netty5.handler.codec.http;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * The default {@link HttpMessage} implementation.
   */
  public abstract class DefaultHttpMessage extends DefaultHttpObject implements HttpMessage {
      private static final int HASH_CODE_PRIME = 31;
      private HttpVersion version;
      private final HttpHeaders headers;
  
      /**
       * Creates a new instance.
       */
      protected DefaultHttpMessage(final HttpVersion version) {
          this(version, true, false);
      }
  
      /**
       * Creates a new instance.
       */
      protected DefaultHttpMessage(final HttpVersion version, boolean validateHeaders, boolean singleFieldHeaders) {
          this(version,
                  singleFieldHeaders ? new CombinedHttpHeaders(validateHeaders)
                                     : new DefaultHttpHeaders(validateHeaders));
      }
  
      /**
       * Creates a new instance.
       */
      protected DefaultHttpMessage(final HttpVersion version, HttpHeaders headers) {
          this.version = requireNonNull(version, "version");
          this.headers = requireNonNull(headers, "headers");
      }
  
      @Override
      public HttpHeaders headers() {
          return headers;
      }
  
      @Override
      @Deprecated
      public HttpVersion getProtocolVersion() {
          return protocolVersion();
      }
  
      @Override
      public HttpVersion protocolVersion() {
          return version;
      }
  
      @Override
      public int hashCode() {
          int result = 1;
          result = HASH_CODE_PRIME * result + headers.hashCode();
          result = HASH_CODE_PRIME * result + version.hashCode();
          result = HASH_CODE_PRIME * result + super.hashCode();
          return result;
      }
  
      @Override
      public boolean equals(Object o) {
          if (!(o instanceof DefaultHttpMessage)) {
              return false;
          }
  
          DefaultHttpMessage other = (DefaultHttpMessage) o;
  
          return headers().equals(other.headers()) &&
                 protocolVersion().equals(other.protocolVersion()) &&
                 super.equals(o);
      }
  
      @Override
      public HttpMessage setProtocolVersion(HttpVersion version) {
          requireNonNull(version, "version");
          this.version = version;
          return this;
      }
  }