View Javadoc

1   //
2   //  ========================================================================
3   //  Copyright (c) 1995-2016 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 java.nio.ByteBuffer;
22  import java.util.EnumSet;
23  
24  import org.eclipse.jetty.util.ArrayTrie;
25  import org.eclipse.jetty.util.BufferUtil;
26  import org.eclipse.jetty.util.Trie;
27  
28  
29  /**
30   * 
31   */
32  public enum HttpHeaderValue
33  {
34      CLOSE("close"),
35      CHUNKED("chunked"),
36      GZIP("gzip"),
37      IDENTITY("identity"),
38      KEEP_ALIVE("keep-alive"),
39      CONTINUE("100-continue"),
40      PROCESSING("102-processing"),
41      TE("TE"),
42      BYTES("bytes"),
43      NO_CACHE("no-cache"),
44      UPGRADE("Upgrade"),
45      UNKNOWN("::UNKNOWN::");
46  
47      /* ------------------------------------------------------------ */
48      public final static Trie<HttpHeaderValue> CACHE= new ArrayTrie<HttpHeaderValue>();
49      static
50      {
51          for (HttpHeaderValue value : HttpHeaderValue.values())
52              if (value!=UNKNOWN)
53                  CACHE.put(value.toString(),value);
54      }
55  
56      private final String _string;
57      private final ByteBuffer _buffer;
58  
59      /* ------------------------------------------------------------ */
60      HttpHeaderValue(String s)
61      {
62          _string=s;
63          _buffer=BufferUtil.toBuffer(s);
64      }
65  
66      /* ------------------------------------------------------------ */
67      public ByteBuffer toBuffer()
68      {
69          return _buffer.asReadOnlyBuffer();
70      }
71  
72      /* ------------------------------------------------------------ */
73      public boolean is(String s)
74      {
75          return _string.equalsIgnoreCase(s);
76      }
77      
78      /* ------------------------------------------------------------ */
79      public String asString()
80      {
81          return _string;
82      }
83  
84      /* ------------------------------------------------------------ */
85      @Override
86      public String toString()
87      {
88          return _string;
89      }
90  
91      /* ------------------------------------------------------------ */
92      private static EnumSet<HttpHeader> __known =
93              EnumSet.of(HttpHeader.CONNECTION,
94                      HttpHeader.TRANSFER_ENCODING,
95                      HttpHeader.CONTENT_ENCODING);
96  
97      /* ------------------------------------------------------------ */
98      public static boolean hasKnownValues(HttpHeader header)
99      {
100         if (header==null)
101             return false;
102         return __known.contains(header);
103     }
104 }