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1   // ========================================================================
2   // Copyright (c) 2004-2009 Mort Bay Consulting Pty. Ltd.
3   // ------------------------------------------------------------------------
4   // All rights reserved. This program and the accompanying materials
5   // are made available under the terms of the Eclipse Public License v1.0
6   // and Apache License v2.0 which accompanies this distribution.
7   // The Eclipse Public License is available at 
8   // http://www.eclipse.org/legal/epl-v10.html
9   // The Apache License v2.0 is available at
10  // http://www.opensource.org/licenses/apache2.0.php
11  // You may elect to redistribute this code under either of these licenses. 
12  // ========================================================================
13  
14  package org.eclipse.jetty.http;
15  
16  import org.eclipse.jetty.io.Buffer;
17  import org.eclipse.jetty.io.BufferCache;
18  import org.eclipse.jetty.io.ByteArrayBuffer;
19  
20  /**
21   * Cached HTTP Header values.
22   * This class caches the conversion of common HTTP Header values to and from {@link ByteArrayBuffer} instances.
23   * The resource "/org/eclipse/jetty/useragents" is checked for a list of common user agents, so that repeated
24   * creation of strings for these agents can be avoided.
25   * 
26   * 
27   */
28  public class HttpHeaderValues extends BufferCache
29  {
30      public final static String
31          CLOSE="close",
32          CHUNKED="chunked",
33          GZIP="gzip",
34          IDENTITY="identity",
35          KEEP_ALIVE="keep-alive",
36          CONTINUE="100-continue",
37          PROCESSING="102-processing",
38          TE="TE",
39          BYTES="bytes",
40          NO_CACHE="no-cache",
41          UPGRADE="Upgrade";
42  
43      public final static int
44          CLOSE_ORDINAL=1,
45          CHUNKED_ORDINAL=2,
46          GZIP_ORDINAL=3,
47          IDENTITY_ORDINAL=4,
48          KEEP_ALIVE_ORDINAL=5,
49          CONTINUE_ORDINAL=6,
50          PROCESSING_ORDINAL=7,
51          TE_ORDINAL=8,
52          BYTES_ORDINAL=9,
53          NO_CACHE_ORDINAL=10,
54          UPGRADE_ORDINAL=11;
55      
56      public final static HttpHeaderValues CACHE= new HttpHeaderValues();
57  
58      public final static Buffer 
59          CLOSE_BUFFER=CACHE.add(CLOSE,CLOSE_ORDINAL),
60          CHUNKED_BUFFER=CACHE.add(CHUNKED,CHUNKED_ORDINAL),
61          GZIP_BUFFER=CACHE.add(GZIP,GZIP_ORDINAL),
62          IDENTITY_BUFFER=CACHE.add(IDENTITY,IDENTITY_ORDINAL),
63          KEEP_ALIVE_BUFFER=CACHE.add(KEEP_ALIVE,KEEP_ALIVE_ORDINAL),
64          CONTINUE_BUFFER=CACHE.add(CONTINUE, CONTINUE_ORDINAL),
65          PROCESSING_BUFFER=CACHE.add(PROCESSING, PROCESSING_ORDINAL),
66          TE_BUFFER=CACHE.add(TE,TE_ORDINAL),
67          BYTES_BUFFER=CACHE.add(BYTES,BYTES_ORDINAL),
68          NO_CACHE_BUFFER=CACHE.add(NO_CACHE,NO_CACHE_ORDINAL),
69          UPGRADE_BUFFER=CACHE.add(UPGRADE,UPGRADE_ORDINAL);
70          
71  
72      public static boolean hasKnownValues(int httpHeaderOrdinal)
73      {
74          switch(httpHeaderOrdinal)
75          {
76              case HttpHeaders.CONNECTION_ORDINAL:
77              case HttpHeaders.TRANSFER_ENCODING_ORDINAL:
78              case HttpHeaders.CONTENT_ENCODING_ORDINAL:
79                  return true;
80          }
81          return false;
82      }
83  }