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1   /*
2    * Copyright 2009 Red Hat, Inc.
3    *
4    * Red Hat licenses this file to you under the Apache License, version 2.0
5    * (the "License"); you may not use this file except in compliance with the
6    * 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 org.jboss.netty.handler.codec.frame;
17  
18  import org.jboss.netty.buffer.ChannelBuffer;
19  import org.jboss.netty.buffer.ChannelBuffers;
20  
21  /**
22   * A set of commonly used delimiters for {@link DelimiterBasedFrameDecoder}.
23   *
24   * @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
25   * @author <a href="http://gleamynode.net/">Trustin Lee</a>
26   *
27   * @version $Rev:231 $, $Date:2008-06-12 16:44:50 +0900 (목, 12 6월 2008) $
28   *
29   */
30  public class Delimiters {
31  
32      /**
33       * Returns a {@code NUL (0x00)} delimiter, which could be used for
34       * Flash XML socket or any similar protocols.
35       */
36      public static ChannelBuffer[] nulDelimiter() {
37          return new ChannelBuffer[] {
38                  ChannelBuffers.wrappedBuffer(new byte[] { 0 }) };
39      }
40  
41      /**
42       * Returns {@code CR ('\r')} and {@code LF ('\n')} delimiters, which could
43       * be used for text-based line protocols.
44       */
45      public static ChannelBuffer[] lineDelimiter() {
46          return new ChannelBuffer[] {
47                  ChannelBuffers.wrappedBuffer(new byte[] { '\r', '\n' }),
48                  ChannelBuffers.wrappedBuffer(new byte[] { '\n' }),
49          };
50      }
51  
52      private Delimiters() {
53          // Unused
54      }
55  }