1 //
2 //  ========================================================================
3 //  Copyright (c) 1995-2014 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 
hasKnownValues(int httpHeaderOrdinal)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 }
89