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1   //
2   //  ========================================================================
3   //  Copyright (c) 1995-2013 Mort Bay Consulting Pty. Ltd.
4   //  ------------------------------------------------------------------------
5   //  All rights reserved. This program and the accompanying materials
6   //  are made available under the terms of the Eclipse Public License v1.0
7   //  and Apache License v2.0 which accompanies this distribution.
8   //
9   //      The Eclipse Public License is available at
10  //      http://www.eclipse.org/legal/epl-v10.html
11  //
12  //      The Apache License v2.0 is available at
13  //      http://www.opensource.org/licenses/apache2.0.php
14  //
15  //  You may elect to redistribute this code under either of these licenses.
16  //  ========================================================================
17  //
18  
19  package org.eclipse.jetty.http;
20  
21  import org.eclipse.jetty.io.Buffer;
22  import org.eclipse.jetty.io.BufferCache;
23  import org.eclipse.jetty.io.ByteArrayBuffer;
24  
25  /**
26   * Cached HTTP Header values.
27   * This class caches the conversion of common HTTP Header values to and from {@link ByteArrayBuffer} instances.
28   * The resource "/org/eclipse/jetty/useragents" is checked for a list of common user agents, so that repeated
29   * creation of strings for these agents can be avoided.
30   * 
31   * 
32   */
33  public class HttpHeaderValues extends BufferCache
34  {
35      public final static String
36          CLOSE="close",
37          CHUNKED="chunked",
38          GZIP="gzip",
39          IDENTITY="identity",
40          KEEP_ALIVE="keep-alive",
41          CONTINUE="100-continue",
42          PROCESSING="102-processing",
43          TE="TE",
44          BYTES="bytes",
45          NO_CACHE="no-cache",
46          UPGRADE="Upgrade";
47  
48      public final static int
49          CLOSE_ORDINAL=1,
50          CHUNKED_ORDINAL=2,
51          GZIP_ORDINAL=3,
52          IDENTITY_ORDINAL=4,
53          KEEP_ALIVE_ORDINAL=5,
54          CONTINUE_ORDINAL=6,
55          PROCESSING_ORDINAL=7,
56          TE_ORDINAL=8,
57          BYTES_ORDINAL=9,
58          NO_CACHE_ORDINAL=10,
59          UPGRADE_ORDINAL=11;
60      
61      public final static HttpHeaderValues CACHE= new HttpHeaderValues();
62  
63      public final static Buffer 
64          CLOSE_BUFFER=CACHE.add(CLOSE,CLOSE_ORDINAL),
65          CHUNKED_BUFFER=CACHE.add(CHUNKED,CHUNKED_ORDINAL),
66          GZIP_BUFFER=CACHE.add(GZIP,GZIP_ORDINAL),
67          IDENTITY_BUFFER=CACHE.add(IDENTITY,IDENTITY_ORDINAL),
68          KEEP_ALIVE_BUFFER=CACHE.add(KEEP_ALIVE,KEEP_ALIVE_ORDINAL),
69          CONTINUE_BUFFER=CACHE.add(CONTINUE, CONTINUE_ORDINAL),
70          PROCESSING_BUFFER=CACHE.add(PROCESSING, PROCESSING_ORDINAL),
71          TE_BUFFER=CACHE.add(TE,TE_ORDINAL),
72          BYTES_BUFFER=CACHE.add(BYTES,BYTES_ORDINAL),
73          NO_CACHE_BUFFER=CACHE.add(NO_CACHE,NO_CACHE_ORDINAL),
74          UPGRADE_BUFFER=CACHE.add(UPGRADE,UPGRADE_ORDINAL);
75          
76  
77      public static boolean hasKnownValues(int httpHeaderOrdinal)
78      {
79          switch(httpHeaderOrdinal)
80          {
81              case HttpHeaders.CONNECTION_ORDINAL:
82              case HttpHeaders.TRANSFER_ENCODING_ORDINAL:
83              case HttpHeaders.CONTENT_ENCODING_ORDINAL:
84                  return true;
85          }
86          return false;
87      }
88  }