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1   /*
2    * Copyright 2012 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  package io.netty.handler.codec.http;
17  
18  import io.netty.buffer.ByteBuf;
19  import io.netty.handler.codec.AsciiString;
20  
21  import static io.netty.handler.codec.http.HttpConstants.*;
22  
23  /**
24   * Encodes an {@link HttpResponse} or an {@link HttpContent} into
25   * a {@link ByteBuf}.
26   */
27  public class HttpResponseEncoder extends HttpObjectEncoder<HttpResponse> {
28      private static final byte[] CRLF = { CR, LF };
29  
30      @Override
31      public boolean acceptOutboundMessage(Object msg) throws Exception {
32          return super.acceptOutboundMessage(msg) && !(msg instanceof HttpRequest);
33      }
34  
35      @Override
36      protected void encodeInitialLine(ByteBuf buf, HttpResponse response) throws Exception {
37          AsciiString version = response.protocolVersion().text();
38          buf.writeBytes(version.array(), version.arrayOffset(), version.length());
39          buf.writeByte(SP);
40  
41          AsciiString code = response.status().codeAsText();
42          buf.writeBytes(code.array(), code.arrayOffset(), code.length());
43          buf.writeByte(SP);
44  
45          AsciiString reasonPhrase = response.status().reasonPhrase();
46          buf.writeBytes(reasonPhrase.array(), reasonPhrase.arrayOffset(), reasonPhrase.length());
47          buf.writeBytes(CRLF);
48      }
49  }